storage

package
v0.0.0-...-70e73ec Latest Latest
Warning

This package is not in the latest version of its module.

 Go to latest Published: Aug 6, 2016 License: Apache-2.0 Imports: 60 Imported by: 0

Documentation

Overview

Package storage provides access to the Store and Range abstractions. Each Cockroach node handles one or more stores, each of which multiplexes to one or more ranges, identified by [start, end) keys. Ranges are contiguous regions of the keyspace. Each range implements an instance of the Raft consensus algorithm to synchronize participating range replicas.

Each store is represented by a single engine.Engine instance. The ranges hosted by a store all have access to the same engine, but write to only a range-limited keyspace within it. Ranges access the underlying engine via the MVCC interface, which provides historical versioned values. 

Package storage is a generated protocol buffer package.

It is generated from these files:
	cockroach/storage/raft.proto

It has these top-level messages:
	RaftMessageRequest
	RaftMessageResponse
	ConfChangeContext
Example (Rebalancing) 
stopper := stop.NewStopper()
defer stopper.Stop()

// Model a set of stores in a cluster,
// randomly adding / removing stores and adding bytes.
rpcContext := rpc.NewContext(&base.Context{Insecure: true}, nil, stopper)
server := rpc.NewServer(rpcContext) // never started
g := gossip.New(rpcContext, server, nil, stopper, metric.NewRegistry())
// Have to call g.SetNodeID before call g.AddInfo
g.SetNodeID(roachpb.NodeID(1))
sp := NewStorePool(
	g,
	hlc.NewClock(hlc.UnixNano),
	nil,
	/* reservationsEnabled */ true,
	TestTimeUntilStoreDeadOff,
	stopper,
)
alloc := MakeAllocator(sp, AllocatorOptions{AllowRebalance: true, Deterministic: true})

var wg sync.WaitGroup
g.RegisterCallback(gossip.MakePrefixPattern(gossip.KeyStorePrefix), func(_ string, _ roachpb.Value) { wg.Done() })

const generations = 100
const nodes = 20

// Initialize testStores.
var testStores [nodes]testStore
for i := 0; i < len(testStores); i++ {
	testStores[i].StoreID = roachpb.StoreID(i)
	testStores[i].Node = roachpb.NodeDescriptor{NodeID: roachpb.NodeID(i)}
	testStores[i].Capacity = roachpb.StoreCapacity{Capacity: 1 << 30, Available: 1 << 30}
}
// Initialize the cluster with a single range.
testStores[0].add(alloc.randGen.Int63n(1 << 20))

for i := 0; i < generations; i++ {
	// First loop through test stores and add data.
	wg.Add(len(testStores))
	for j := 0; j < len(testStores); j++ {
		// Add a pretend range to the testStore if there's already one.
		if testStores[j].Capacity.RangeCount > 0 {
			testStores[j].add(alloc.randGen.Int63n(1 << 20))
		}
		if err := g.AddInfoProto(gossip.MakeStoreKey(roachpb.StoreID(j)), &testStores[j].StoreDescriptor, 0); err != nil {
			panic(err)
		}
	}
	wg.Wait()

	// Next loop through test stores and maybe rebalance.
	for j := 0; j < len(testStores); j++ {
		ts := &testStores[j]
		target := alloc.RebalanceTarget(
			roachpb.Attributes{},
			[]roachpb.ReplicaDescriptor{{NodeID: ts.Node.NodeID, StoreID: ts.StoreID}},
			-1)
		if target != nil {
			testStores[j].rebalance(&testStores[int(target.StoreID)], alloc.randGen.Int63n(1<<20))
		}
	}

	// Output store capacities as hexadecimal 2-character values.
	if i%(generations/50) == 0 {
		var maxBytes int64
		for j := 0; j < len(testStores); j++ {
			bytes := testStores[j].Capacity.Capacity - testStores[j].Capacity.Available
			if bytes > maxBytes {
				maxBytes = bytes
			}
		}
		if maxBytes > 0 {
			for j := 0; j < len(testStores); j++ {
				endStr := " "
				if j == len(testStores)-1 {
					endStr = ""
				}
				bytes := testStores[j].Capacity.Capacity - testStores[j].Capacity.Available
				fmt.Printf("%03d%s", (999*bytes)/maxBytes, endStr)
			}
			fmt.Printf("\n")
		}
	}
}

var totBytes int64
var totRanges int32
for i := 0; i < len(testStores); i++ {
	totBytes += testStores[i].Capacity.Capacity - testStores[i].Capacity.Available
	totRanges += testStores[i].Capacity.RangeCount
}
fmt.Printf("Total bytes=%d, ranges=%d\n", totBytes, totRanges)

Output:

999 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000
999 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000
999 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000
999 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000
999 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000
999 000 000 000 014 000 000 118 000 000 000 000 111 000 000 000 000 000 000 000
999 113 095 000 073 064 000 221 003 000 020 178 182 000 057 000 027 000 055 000
999 398 222 000 299 366 000 525 239 135 263 385 424 261 261 000 260 194 207 322
999 307 170 335 380 357 336 539 233 373 218 444 539 336 258 479 267 352 384 387
999 558 318 587 623 602 453 719 409 506 414 617 638 411 359 486 502 507 454 673
999 588 404 854 616 642 559 705 482 622 505 554 673 489 410 390 524 607 535 671
999 651 498 922 668 696 612 809 619 691 682 674 682 584 533 449 619 724 646 702
999 710 505 832 645 732 719 867 605 794 743 693 717 645 602 503 683 733 686 776
999 773 688 810 658 761 812 957 663 875 856 797 871 670 733 602 839 781 736 909
959 778 750 879 685 797 786 999 751 944 870 786 882 670 828 611 880 817 714 883
946 843 781 892 726 887 876 993 717 999 940 802 879 672 842 634 862 818 736 906
924 826 754 859 742 878 836 927 721 999 893 762 874 672 882 684 918 818 745 897
910 872 789 858 752 878 824 976 715 999 860 739 848 684 890 699 968 846 751 833
938 892 789 879 754 916 861 997 774 983 887 805 827 690 912 751 999 927 800 893
895 887 792 845 784 920 800 999 770 961 890 747 871 701 907 733 970 893 811 858
887 843 742 839 792 938 826 999 778 971 859 792 857 731 889 777 979 900 779 833
891 861 802 819 802 966 826 999 776 946 843 792 836 769 914 792 968 879 775 874
923 840 830 842 778 969 820 999 791 950 843 820 838 767 893 794 995 915 789 885
932 816 783 830 805 926 783 999 790 977 824 856 838 789 866 787 992 892 760 896
917 799 781 813 800 901 759 999 776 983 795 861 813 799 852 776 944 891 739 883
895 759 757 827 799 894 741 999 772 955 779 864 823 812 835 785 956 882 746 865
906 762 773 867 848 874 747 999 763 992 766 866 831 812 839 820 973 906 765 885
915 795 781 884 854 899 782 983 756 999 744 890 840 791 848 806 992 934 774 904
935 768 813 893 859 881 788 948 758 999 748 892 828 803 857 834 989 940 798 900
953 752 816 919 852 882 806 966 771 976 733 877 804 802 854 822 999 957 800 898
909 732 804 882 874 885 814 956 758 937 703 877 805 783 849 833 999 955 796 903
885 744 788 859 851 881 802 929 732 905 702 843 801 774 847 810 999 936 778 880
856 741 790 827 842 897 771 922 732 873 719 849 771 789 845 828 999 914 764 859
880 787 825 841 867 941 782 962 752 918 749 886 797 819 899 862 999 935 792 891
902 829 841 857 903 979 786 979 760 935 767 903 816 839 907 880 999 963 827 927
873 809 831 837 906 964 786 952 772 928 780 904 810 817 914 878 999 974 827 914
879 810 855 843 936 977 806 956 799 930 801 931 823 835 928 895 997 999 864 935
885 806 858 825 921 971 791 965 784 930 809 936 813 829 904 893 999 974 858 902
865 776 855 811 903 966 771 958 770 906 809 923 810 825 896 901 999 964 841 895
880 789 876 816 918 987 772 972 776 912 814 935 836 833 913 901 999 978 863 903
866 779 861 824 926 986 773 958 776 920 810 936 836 855 894 899 999 989 859 904
880 798 862 826 910 997 795 948 767 910 798 923 838 835 872 911 999 975 856 894
885 785 845 807 906 973 783 943 782 918 789 920 832 838 861 894 999 965 849 877
889 793 855 802 918 985 786 948 793 920 800 941 818 849 846 899 999 982 851 886
866 796 854 801 911 969 782 958 791 907 788 940 800 844 843 890 999 977 851 873
849 794 855 815 912 970 790 942 792 898 789 938 794 850 843 884 999 964 854 886
856 806 867 837 930 980 787 944 789 903 804 947 800 863 840 891 999 977 860 874
847 796 852 849 925 980 777 948 786 905 792 922 798 853 835 887 999 968 868 866
851 801 866 846 936 999 795 945 774 909 793 931 794 860 846 908 985 976 882 854
861 815 861 845 934 999 808 958 784 913 780 924 800 860 844 912 986 974 897 844
Total bytes=941960698, ranges=1750

Index

Examples

Constants

View Source 
const (

	// RaftLogQueueTimerDuration is the duration between truncations. This needs
	// to be relatively short so that truncations can keep up with raft log entry
	// creation.
	RaftLogQueueTimerDuration = 50 * time.Millisecond
	// RaftLogQueueStaleThreshold is the minimum threshold for stale raft log
	// entries. A stale entry is one which all replicas of the range have
	// progressed past and thus is no longer needed and can be truncated.
	RaftLogQueueStaleThreshold = 100
)
View Source 
const (

	// ReplicaGCQueueInactivityThreshold is the inactivity duration after which
	// a range will be considered for garbage collection. Exported for testing.
	ReplicaGCQueueInactivityThreshold = 10 * 24 * time.Hour // 10 days
	// ReplicaGCQueueCandidateTimeout is the duration after which a range in
	// candidate Raft state (which is a typical sign of having been removed
	// from the group) will be considered for garbage collection.
	ReplicaGCQueueCandidateTimeout = 1 * time.Second
)
View Source 
const (
	// TestTimeUntilStoreDead is the test value for TimeUntilStoreDead to
	// quickly mark stores as dead.
	TestTimeUntilStoreDead = 5 * time.Millisecond

	// TestTimeUntilStoreDeadOff is the test value for TimeUntilStoreDead that
	// prevents the store pool from marking stores as dead.
	TestTimeUntilStoreDeadOff = 24 * time.Hour
)
View Source 
const (
	// MinTSCacheWindow specifies the minimum duration to hold entries in
	// the cache before allowing eviction. After this window expires,
	// transactions writing to this node with timestamps lagging by more
	// than minCacheWindow will necessarily have to advance their commit
	// timestamp.
	MinTSCacheWindow = 10 * time.Second
)
View Source 
const RangeEventTableSchema = `` /* 314-byte string literal not displayed */

RangeEventTableSchema defines the schema of the event log table. It is currently envisioned as a wide table; many different event types can be recorded to the table.

Variables

View Source 
var (
	ErrInvalidLengthRaft = fmt.Errorf("proto: negative length found during unmarshaling")
	ErrIntOverflowRaft   = fmt.Errorf("proto: integer overflow")
)

Functions

func ComputeStatsForRange 

func ComputeStatsForRange(
	d *roachpb.RangeDescriptor, e engine.Reader, nowNanos int64,
) (enginepb.MVCCStats, error)

ComputeStatsForRange computes the stats for a given range by iterating over all key ranges for the given range that should be accounted for in its stats.

func DecodeRaftCommand 

func DecodeRaftCommand(data []byte) (commandID string, command []byte)

DecodeRaftCommand splits a raftpb.Entry.Data into its commandID and command portions. The caller is responsible for checking that the data is not empty (which indicates a dummy entry generated by raft rather than a real command). Usage is mostly internal to the storage package but is exported for use by debugging tools.

func IterateRangeDescriptors 

func IterateRangeDescriptors(
	eng engine.Reader, fn func(desc roachpb.RangeDescriptor) (bool, error),
) error

IterateRangeDescriptors calls the provided function with each descriptor from the provided Engine. The return values of this method and fn have semantics similar to engine.MVCCIterate.

func NewReplicaCorruptionError 

func NewReplicaCorruptionError(err error) *roachpb.ReplicaCorruptionError

NewReplicaCorruptionError creates a new error indicating a corrupt replica, with the supplied list of errors given as history.

func RegisterMultiRaftServer 

func RegisterMultiRaftServer(s *grpc.Server, srv MultiRaftServer)

func TrackRaftProtos 

func TrackRaftProtos() func() []reflect.Type

TrackRaftProtos instruments proto marshalling to track protos which are marshalled downstream of raft. It returns a function that removes the instrumentation and returns the list of downstream-of-raft protos.

Types

type AbortCache 

type AbortCache struct {
	// contains filtered or unexported fields
}

The AbortCache sets markers for aborted transactions to provide protection against an aborted but active transaction not reading values it wrote (due to its intents having been removed).

The AbortCache stores responses in the underlying engine, using keys derived from Range ID and txn ID.

A AbortCache is not thread safe. Access to it is serialized through Raft.

func NewAbortCache 

func NewAbortCache(rangeID roachpb.RangeID) *AbortCache

NewAbortCache returns a new abort cache. Every range replica maintains an abort cache, not just the lease holder.

func (*AbortCache) ClearData 

func (sc *AbortCache) ClearData(e engine.Engine) error

ClearData removes all persisted items stored in the cache.

func (*AbortCache) CopyFrom 

func (sc *AbortCache) CopyFrom(
	ctx context.Context,
	e engine.ReadWriter,
	ms *enginepb.MVCCStats,
	originRangeID roachpb.RangeID,
) (int, error)

CopyFrom copies all the persisted results from the originRangeID abort cache into this one. Note that the cache will not be locked while copying is in progress. Failures decoding individual entries return an error. The copy is done directly using the engine instead of interpreting values through MVCC for efficiency. On success, returns the number of entries (key-value pairs) copied.

func (*AbortCache) CopyInto 

func (sc *AbortCache) CopyInto(
	e engine.ReadWriter,
	ms *enginepb.MVCCStats,
	destRangeID roachpb.RangeID,
) (int, error)

CopyInto copies all the results from this abort cache into the destRangeID abort cache. Failures decoding individual cache entries return an error. On success, returns the number of entries (key-value pairs) copied.

func (*AbortCache) Del 

func (sc *AbortCache) Del(
	ctx context.Context,
	e engine.ReadWriter,
	ms *enginepb.MVCCStats,
	txnID *uuid.UUID,
) error

Del removes all abort cache entries for the given transaction.

func (*AbortCache) Get 

func (sc *AbortCache) Get(
	ctx context.Context,
	e engine.Reader,
	txnID *uuid.UUID,
	entry *roachpb.AbortCacheEntry,
) (bool, error)

Get looks up an abort cache entry recorded for this transaction ID. Returns whether an abort record was found and any error.

func (*AbortCache) Iterate 

func (sc *AbortCache) Iterate(
	ctx context.Context,
	e engine.Reader,
	f func([]byte, *uuid.UUID, roachpb.AbortCacheEntry),
)

Iterate walks through the abort cache, invoking the given callback for each unmarshaled entry with the key, the transaction ID and the decoded entry. TODO(tschottdorf): should not use a pointer to UUID.

func (*AbortCache) Put 

func (sc *AbortCache) Put(
	ctx context.Context,
	e engine.ReadWriter,
	ms *enginepb.MVCCStats,
	txnID *uuid.UUID,
	entry *roachpb.AbortCacheEntry,
) error

Put writes an entry for the specified transaction ID.

type Allocator 

type Allocator struct {
	// contains filtered or unexported fields
}

Allocator tries to spread replicas as evenly as possible across the stores in the cluster.

func MakeAllocator 

func MakeAllocator(storePool *StorePool, options AllocatorOptions) Allocator

MakeAllocator creates a new allocator using the specified StorePool.

func (*Allocator) AllocateTarget 

func (a *Allocator) AllocateTarget(
	required roachpb.Attributes,
	existing []roachpb.ReplicaDescriptor,
	relaxConstraints bool,
) (*roachpb.StoreDescriptor, error)

AllocateTarget returns a suitable store for a new allocation with the required attributes. Nodes already accommodating existing replicas are ruled out as targets. If relaxConstraints is true, then the required attributes will be relaxed as necessary, from least specific to most specific, in order to allocate a target.

func (*Allocator) ComputeAction 

func (a *Allocator) ComputeAction(zone config.ZoneConfig, desc *roachpb.RangeDescriptor) (
	AllocatorAction, float64)

ComputeAction determines the exact operation needed to repair the supplied range, as governed by the supplied zone configuration. It returns the required action that should be taken and a replica on which the action should be performed.

func (Allocator) RebalanceTarget 

func (a Allocator) RebalanceTarget(
	required roachpb.Attributes,
	existing []roachpb.ReplicaDescriptor,
	leaseStoreID roachpb.StoreID,
) *roachpb.StoreDescriptor

RebalanceTarget returns a suitable store for a rebalance target with required attributes. Rebalance targets are selected via the same mechanism as AllocateTarget(), except the chosen target must follow some additional criteria. Namely, if chosen, it must further the goal of balancing the cluster.

The supplied parameters are the required attributes for the range, a list of the existing replicas of the range and the store ID of the lease-holder replica. The existing replicas modulo the lease-holder replica are candidates for rebalancing. Note that rebalancing is accomplished by first adding a new replica to the range, then removing the most undesirable replica.

Simply ignoring a rebalance opportunity in the event that the target chosen by AllocateTarget() doesn't fit balancing criteria is perfectly fine, as other stores in the cluster will also be doing their probabilistic best to rebalance. This helps prevent a stampeding herd targeting an abnormally under-utilized store.

func (Allocator) RemoveTarget 

func (a Allocator) RemoveTarget(existing []roachpb.ReplicaDescriptor, leaseStoreID roachpb.StoreID) (roachpb.ReplicaDescriptor, error)

RemoveTarget returns a suitable replica to remove from the provided replica set. It attempts to consider which of the provided replicas would be the best candidate for removal. It also will exclude any replica that belongs to the range lease holder's store ID.

TODO(mrtracy): removeTarget eventually needs to accept the attributes from the zone config associated with the provided replicas. This will allow it to make correct decisions in the case of ranges with heterogeneous replica requirements (i.e. multiple data centers).

func (*Allocator) ShouldRebalance 

func (a *Allocator) ShouldRebalance(storeID roachpb.StoreID) bool

ShouldRebalance returns whether the specified store should attempt to rebalance a replica to another store.

TODO(bram): This is only used by the simulator and should be removed.

type AllocatorAction 

type AllocatorAction int

AllocatorAction enumerates the various replication adjustments that may be recommended by the allocator. 

const (
	AllocatorNoop AllocatorAction
	AllocatorRemove
	AllocatorAdd
	AllocatorRemoveDead
)

These are the possible allocator actions.

type AllocatorOptions 

type AllocatorOptions struct {
	// AllowRebalance allows this store to attempt to rebalance its own
	// replicas to other stores.
	AllowRebalance bool

	// Deterministic makes allocation decisions deterministic, based on
	// current cluster statistics. If this flag is not set, allocation operations
	// will have random behavior. This flag is intended to be set for testing
	// purposes only.
	Deterministic bool
}

AllocatorOptions are configurable options which effect the way that the replicate queue will handle rebalancing opportunities.

type CommandQueue 

type CommandQueue struct {
	// contains filtered or unexported fields
}

A CommandQueue maintains an interval tree of keys or key ranges for executing commands. New commands affecting keys or key ranges must wait on already-executing commands which overlap their key range.

Before executing, a command invokes GetWait() to acquire a slice of channels belonging to overlapping commands which are already running. Each channel is waited on by the caller for confirmation that all overlapping, pending commands have completed and the pending command can proceed.

After waiting, a command is added to the queue's already-executing set via add(). add accepts a parameter indicating whether the command is read-only. Read-only commands don't need to wait on other read-only commands, so the channels returned via GetWait() don't include read-only on read-only overlapping commands as an optimization.

Once commands complete, remove() is invoked to remove the executing command and close its channel, possibly signaling waiting commands who were gated by the executing command's affected key(s).

CommandQueue is not thread safe.

func NewCommandQueue 

func NewCommandQueue() *CommandQueue

NewCommandQueue returns a new command queue.

type ConfChangeContext 

type ConfChangeContext struct {
	CommandID string `protobuf:"bytes,1,opt,name=command_id,json=commandId" json:"command_id"`
	// Payload is the application-level command (i.e. an encoded
	// roachpb.EndTransactionRequest).
	Payload []byte `protobuf:"bytes,2,opt,name=payload" json:"payload,omitempty"`
	// Replica contains full details about the replica being added or removed.
	Replica cockroach_roachpb.ReplicaDescriptor `protobuf:"bytes,3,opt,name=replica" json:"replica"`
}

ConfChangeContext is encoded in the raftpb.ConfChange.Context field.

func (*ConfChangeContext) Descriptor 

func (*ConfChangeContext) Descriptor() ([]byte, []int)

func (*ConfChangeContext) Marshal 

func (m *ConfChangeContext) Marshal() (data []byte, err error)

func (*ConfChangeContext) MarshalTo 

func (m *ConfChangeContext) MarshalTo(data []byte) (int, error)

func (*ConfChangeContext) ProtoMessage 

func (*ConfChangeContext) ProtoMessage()

func (*ConfChangeContext) Reset 

func (m *ConfChangeContext) Reset()

func (*ConfChangeContext) Size 

func (m *ConfChangeContext) Size() (n int)

func (*ConfChangeContext) String 

func (m *ConfChangeContext) String() string

func (*ConfChangeContext) Unmarshal 

func (m *ConfChangeContext) Unmarshal(data []byte) error

type GCInfo 

type GCInfo struct {
	// Now is the timestamp used for age computations.
	Now hlc.Timestamp
	// Policy is the policy used for this garbage collection cycle.
	Policy config.GCPolicy
	// Stats about the userspace key-values considered, namely the number of
	// keys with GC'able data, the number of "old" intents and the number of
	// associated distinct transactions.
	GCKeys, IntentsConsidered, IntentTxns int
	// TransactionSpanTotal is the total number of entries in the transaction span.
	TransactionSpanTotal int
	// Summary of transactions which were found GCable (assuming that
	// potentially necessary intent resolutions did not fail).
	TransactionSpanGCAborted, TransactionSpanGCCommitted, TransactionSpanGCPending int
	// AbortSpanTotal is the total number of transactions present in the abort cache.
	AbortSpanTotal int
	// AbortSpanConsidered is the number of abort cache entries old enough to be
	// considered for removal. An "entry" corresponds to one transaction;
	// more than one key-value pair may be associated with it.
	AbortSpanConsidered int
	// AbortSpanGCNum is the number of abort cache entries fit for removal (due
	// to their transactions having terminated).
	AbortSpanGCNum int
	// PushTxn is the total number of pushes attempted in this cycle.
	PushTxn int
	// ResolveTotal is the total number of attempted intent resolutions in
	// this cycle.
	ResolveTotal int
	// ResolveErrors is the number of successful intent resolutions.
	ResolveSuccess int
	// Threshold is the computed expiration timestamp. Equal to `Now - Policy`.
	Threshold hlc.Timestamp
}

GCInfo contains statistics and insights from a GC run.

func RunGC 

func RunGC(
	ctx context.Context,
	desc *roachpb.RangeDescriptor,
	snap engine.Reader,
	now hlc.Timestamp,
	policy config.GCPolicy,
	pushTxn pushFunc,
	resolveIntents resolveFunc,
) ([]roachpb.GCRequest_GCKey, GCInfo, error)

RunGC runs garbage collection for the specified descriptor on the provided Engine (which is not mutated). It uses the provided functions pushTxn and resolveIntents to clarify the true status of and clean up after encountered transactions. It returns a slice of gc'able keys from the data, transaction, and abort spans.

type InternalStoresServer 

type InternalStoresServer struct {
	// contains filtered or unexported fields
}

InternalStoresServer implements the storage parts of the roachpb.InternalStoresServer interface.

func MakeInternalStoresServer 

func MakeInternalStoresServer(
	descriptor *roachpb.NodeDescriptor, stores *Stores,
) InternalStoresServer

MakeInternalStoresServer returns a new instance of InternalStoresServer.

func (InternalStoresServer) PollFrozen 

func (is InternalStoresServer) PollFrozen(
	ctx context.Context, args *roachpb.PollFrozenRequest,
) (*roachpb.PollFrozenResponse, error)

PollFrozen implements the roachpb.InternalStoresServer interface.

func (InternalStoresServer) Reserve 

func (is InternalStoresServer) Reserve(
	ctx context.Context, req *roachpb.ReservationRequest,
) (*roachpb.ReservationResponse, error)

Reserve implements the roachpb.InternalStoresServer interface.

type MultiRaftClient 

type MultiRaftClient interface {
	RaftMessage(ctx context.Context, opts ...grpc.CallOption) (MultiRaft_RaftMessageClient, error)
}

func NewMultiRaftClient 

func NewMultiRaftClient(cc *grpc.ClientConn) MultiRaftClient

type MultiRaftServer 

type MultiRaftServer interface {
	RaftMessage(MultiRaft_RaftMessageServer) error
}

type MultiRaft_RaftMessageClient 

type MultiRaft_RaftMessageClient interface {
	Send(*RaftMessageRequest) error
	CloseAndRecv() (*RaftMessageResponse, error)
	grpc.ClientStream
}

type MultiRaft_RaftMessageServer 

type MultiRaft_RaftMessageServer interface {
	SendAndClose(*RaftMessageResponse) error
	Recv() (*RaftMessageRequest, error)
	grpc.ServerStream
}

type NodeAddressResolver 

type NodeAddressResolver func(roachpb.NodeID) (net.Addr, error)

NodeAddressResolver is the function used by RaftTransport to map node IDs to network addresses.

func GossipAddressResolver 

func GossipAddressResolver(gossip *gossip.Gossip) NodeAddressResolver

GossipAddressResolver is a thin wrapper around gossip's GetNodeIDAddress that allows its return value to be used as the net.Addr interface.

type NotBootstrappedError 

type NotBootstrappedError struct{}

A NotBootstrappedError indicates that an engine has not yet been bootstrapped due to a store identifier not being present.

func (*NotBootstrappedError) Error 

func (e *NotBootstrappedError) Error() string

Error formats error.

type PostCommitTrigger 

type PostCommitTrigger struct {
	// contains filtered or unexported fields
}

PostCommitTrigger is returned from Raft processing as a side effect which signals that further action should be taken as part of the processing of the Raft command. Depending on the content, actions may be executed on all Replicas, the lease holder, or a Replica determined by other conditions present in the specific trigger.

type RaftMessageRequest 

type RaftMessageRequest struct {
	RangeID     github_com_cockroachdb_cockroach_roachpb.RangeID `protobuf:"varint,1,opt,name=range_id,json=rangeId,casttype=github.com/cockroachdb/cockroach/roachpb.RangeID" json:"range_id"`
	FromReplica cockroach_roachpb.ReplicaDescriptor              `protobuf:"bytes,2,opt,name=from_replica,json=fromReplica" json:"from_replica"`
	ToReplica   cockroach_roachpb.ReplicaDescriptor              `protobuf:"bytes,3,opt,name=to_replica,json=toReplica" json:"to_replica"`
	Message     raftpb.Message                                   `protobuf:"bytes,4,opt,name=message" json:"message"`
}

RaftMessageRequest is the request used to send raft messages using our protobuf-based RPC codec.

func (*RaftMessageRequest) Descriptor 

func (*RaftMessageRequest) Descriptor() ([]byte, []int)

func (*RaftMessageRequest) GetUser 

func (*RaftMessageRequest) GetUser() string

GetUser implements security.RequestWithUser. Raft messages are always sent by the node user.

func (*RaftMessageRequest) Marshal 

func (m *RaftMessageRequest) Marshal() (data []byte, err error)

func (*RaftMessageRequest) MarshalTo 

func (m *RaftMessageRequest) MarshalTo(data []byte) (int, error)

func (*RaftMessageRequest) ProtoMessage 

func (*RaftMessageRequest) ProtoMessage()

func (*RaftMessageRequest) Reset 

func (m *RaftMessageRequest) Reset()

func (*RaftMessageRequest) Size 

func (m *RaftMessageRequest) Size() (n int)

func (*RaftMessageRequest) String 

func (m *RaftMessageRequest) String() string

func (*RaftMessageRequest) Unmarshal 

func (m *RaftMessageRequest) Unmarshal(data []byte) error

type RaftMessageResponse 

type RaftMessageResponse struct {
}

RaftMessageResponse is an empty message returned by raft RPCs. If a response is needed it will be sent as a separate message.

func (*RaftMessageResponse) Descriptor 

func (*RaftMessageResponse) Descriptor() ([]byte, []int)

func (*RaftMessageResponse) Marshal 

func (m *RaftMessageResponse) Marshal() (data []byte, err error)

func (*RaftMessageResponse) MarshalTo 

func (m *RaftMessageResponse) MarshalTo(data []byte) (int, error)

func (*RaftMessageResponse) ProtoMessage 

func (*RaftMessageResponse) ProtoMessage()

func (*RaftMessageResponse) Reset 

func (m *RaftMessageResponse) Reset()

func (*RaftMessageResponse) Size 

func (m *RaftMessageResponse) Size() (n int)

func (*RaftMessageResponse) String 

func (m *RaftMessageResponse) String() string

func (*RaftMessageResponse) Unmarshal 

func (m *RaftMessageResponse) Unmarshal(data []byte) error

type RaftSender 

type RaftSender struct {
	// contains filtered or unexported fields
}

RaftSender is a wrapper around RaftTransport that provides an error handler.

func (RaftSender) SendAsync 

func (s RaftSender) SendAsync(req *RaftMessageRequest) bool

SendAsync sends a message to the recipient specified in the request. It returns false if the outgoing queue is full and calls s.onError when the recipient closes the stream.

type RaftSnapshotStatus 

type RaftSnapshotStatus struct {
	Req *RaftMessageRequest
	Err error
}

RaftSnapshotStatus contains a MsgSnap message and its resulting error, for asynchronous notification of completion.

type RaftTransport 

type RaftTransport struct {
	SnapshotStatusChan chan RaftSnapshotStatus
	// contains filtered or unexported fields
}

RaftTransport handles the rpc messages for raft.

The raft transport is asynchronous with respect to the caller, and internally multiplexes outbound messages. Internally, each message is queued on a per-destination queue before being asynchronously delivered.

Callers are required to construct a RaftSender before being able to dispatch messages, and must provide an error handler which will be invoked asynchronously in the event that the recipient of any message closes its inbound RPC stream. This callback is asynchronous with respect to the outbound message which caused the remote to hang up; all that is known is which remote hung up.

func NewDummyRaftTransport 

func NewDummyRaftTransport() *RaftTransport

NewDummyRaftTransport returns a dummy raft transport for use in tests which need a non-nil raft transport that need not function.

func NewRaftTransport 

func NewRaftTransport(resolver NodeAddressResolver, grpcServer *grpc.Server, rpcContext *rpc.Context) *RaftTransport

NewRaftTransport creates a new RaftTransport with specified resolver and grpc server. Callers are responsible for monitoring RaftTransport.SnapshotStatusChan.

func (*RaftTransport) GetCircuitBreaker 

func (t *RaftTransport) GetCircuitBreaker(nodeID roachpb.NodeID) *circuit.Breaker

GetCircuitBreaker returns the circuit breaker controlling connection attempts to the specified node. NOTE: For unittesting.

func (*RaftTransport) Listen 

func (t *RaftTransport) Listen(storeID roachpb.StoreID, handler raftMessageHandler)

Listen registers a raftMessageHandler to receive proxied messages.

func (*RaftTransport) MakeSender 

func (t *RaftTransport) MakeSender(onError errHandler) RaftSender

MakeSender constructs a RaftSender with the provided error handler.

func (*RaftTransport) RaftMessage 

func (t *RaftTransport) RaftMessage(stream MultiRaft_RaftMessageServer) (err error)

RaftMessage proxies the incoming request to the listening server interface.

func (*RaftTransport) Stop 

func (t *RaftTransport) Stop(storeID roachpb.StoreID)

Stop unregisters a raftMessageHandler.

type RangeEventLogType 

type RangeEventLogType string

RangeEventLogType describes a specific event type recorded in the range log table. 

const (
	// RangeEventLogSplit is the event type recorded when a range splits.
	RangeEventLogSplit RangeEventLogType = "split"
	// RangeEventLogAdd is the event type recorded when a range adds a
	// new replica.
	RangeEventLogAdd RangeEventLogType = "add"
	// RangeEventLogRemove is the event type recorded when a range removes a
	// replica.
	RangeEventLogRemove RangeEventLogType = "remove"
)

type Replica 

type Replica struct {
	// TODO(tschottdorf): Duplicates r.mu.state.desc.RangeID; revisit that.
	RangeID roachpb.RangeID // Should only be set by the constructor.
	// contains filtered or unexported fields
}

A Replica is a contiguous keyspace with writes managed via an instance of the Raft consensus algorithm. Many ranges may exist in a store and they are unlikely to be contiguous. Ranges are independent units and are responsible for maintaining their own integrity by replacing failed replicas, splitting and merging as appropriate.

func NewReplica 

func NewReplica(desc *roachpb.RangeDescriptor, store *Store, replicaID roachpb.ReplicaID) (*Replica, error)

NewReplica initializes the replica using the given metadata. If the replica is initialized (i.e. desc contains more than a RangeID), replicaID should be 0 and the replicaID will be discovered from the descriptor.

func (*Replica) AdminMerge 

func (r *Replica) AdminMerge(
	ctx context.Context, args roachpb.AdminMergeRequest, origLeftDesc *roachpb.RangeDescriptor,
) (roachpb.AdminMergeResponse, *roachpb.Error)

AdminMerge extends this range to subsume the range that comes next in the key space. The merge is performed inside of a distributed transaction which writes the left hand side range descriptor (the subsuming range) and deletes the range descriptor for the right hand side range (the subsumed range). It also updates the range addressing metadata. The handover of responsibility for the reassigned key range is carried out seamlessly through a merge trigger carried out as part of the commit of that transaction. A merge requires that the two ranges are collocated on the same set of replicas.

The supplied RangeDescriptor is used as a form of optimistic lock. See the comment of "AdminSplit" for more information on this pattern.

func (*Replica) AdminSplit 

func (r *Replica) AdminSplit(
	ctx context.Context, args roachpb.AdminSplitRequest, desc *roachpb.RangeDescriptor,
) (roachpb.AdminSplitResponse, *roachpb.Error)

AdminSplit divides the range into into two ranges, using either args.SplitKey (if provided) or an internally computed key that aims to roughly equipartition the range by size. The split is done inside of a distributed txn which writes updated left and new right hand side range descriptors, and updates the range addressing metadata. The handover of responsibility for the reassigned key range is carried out seamlessly through a split trigger carried out as part of the commit of that transaction.

The supplied RangeDescriptor is used as a form of optimistic lock. An operation which might split a range should obtain a copy of the range's current descriptor before making the decision to split. If the decision is affirmative the descriptor is passed to AdminSplit, which performs a Conditional Put on the RangeDescriptor to ensure that no other operation has modified the range in the time the decision was being made. TODO(tschottdorf): should assert that split key is not a local key.

See the comment on splitTrigger for details on the complexities.

func (*Replica) AdminTransferLease 

func (r *Replica) AdminTransferLease(target roachpb.StoreID) error

AdminTransferLease transfers the LeaderLease to another replica. Only the current holder of the LeaderLease can do a transfer, because it needs to stop serving reads and proposing Raft commands (CPut is a read) after sending the transfer command. If it did not stop serving reads immediately, it would potentially serve reads with timestamps greater than the start timestamp of the new (transferred) lease. More subtly, the replica can't even serve reads or propose commands with timestamps lower than the start of the new lease because it could lead to read your own write violations (see comments on the stasis period in the Lease proto). We could, in principle, serve reads more than the maximum clock offset in the past.

The method waits for any in-progress lease extension to be done, and it also blocks until the transfer is done. If a transfer is already in progress, this method joins in waiting for it to complete if it's transferring to the same replica. Otherwise, a NotLeaderError is returned.

TODO(andrei): figure out how to persist the "not serving" state across node restarts.

func (*Replica) BeginTransaction 

func (r *Replica) BeginTransaction(
	ctx context.Context,
	batch engine.ReadWriter,
	ms *enginepb.MVCCStats,
	h roachpb.Header,
	args roachpb.BeginTransactionRequest,
) (roachpb.BeginTransactionResponse, error)

BeginTransaction writes the initial transaction record. Fails in the event that a transaction record is already written. This may occur if a transaction is started with a batch containing writes to different ranges, and the range containing the txn record fails to receive the write batch before a heartbeat or txn push is performed first and aborts the transaction.

func (*Replica) ChangeFrozen 

func (r *Replica) ChangeFrozen(
	ctx context.Context,
	batch engine.ReadWriter,
	ms *enginepb.MVCCStats,
	h roachpb.Header,
	args roachpb.ChangeFrozenRequest,
) (roachpb.ChangeFrozenResponse, *PostCommitTrigger, error)

ChangeFrozen freezes or unfreezes the Replica idempotently.

func (*Replica) ChangeReplicas 

func (r *Replica) ChangeReplicas(
	ctx context.Context,
	changeType roachpb.ReplicaChangeType,
	repDesc roachpb.ReplicaDescriptor,
	desc *roachpb.RangeDescriptor,
) error

ChangeReplicas adds or removes a replica of a range. The change is performed in a distributed transaction and takes effect when that transaction is committed. When removing a replica, only the NodeID and StoreID fields of the Replica are used.

The supplied RangeDescriptor is used as a form of optimistic lock. See the comment of "AdminSplit" for more information on this pattern.

Changing the replicas for a range is complicated. A change is initiated by the "replicate" queue when it encounters a range which has too many replicas, too few replicas or requires rebalancing. Addition and removal of a replica is divided into four phases. The first phase, which occurs in Replica.ChangeReplicas, is performed via a distributed transaction which updates the range descriptor and the meta range addressing information. This transaction includes a special ChangeReplicasTrigger on the EndTransaction request. A ConditionalPut of the RangeDescriptor implements the optimistic lock on the RangeDescriptor mentioned previously. Like all transactions, the requests within the transaction are replicated via Raft, including the EndTransaction request.

The second phase of processing occurs when the batch containing the EndTransaction is proposed to raft. This proposing occurs on whatever replica received the batch, usually, but not always the range lease holder. defaultProposeRaftCommandLocked notices that the EndTransaction contains a ChangeReplicasTrigger and proposes a ConfChange to Raft (via raft.RawNode.ProposeConfChange).

The ConfChange is propagated to all of the replicas similar to a normal Raft command, though additional processing is done inside of Raft. A Replica encounters the ConfChange in Replica.handleRaftReady and executes it using raft.RawNode.ApplyConfChange. If a new replica was added the Raft leader will start sending it heartbeat messages and attempting to bring it up to date. If a replica was removed, it is at this point that the Raft leader will stop communicating with it.

The fourth phase of change replicas occurs when each replica for the range encounters the ChangeReplicasTrigger when applying the EndTransaction request. The replica will update its local range descriptor so as to contain the new set of replicas. If the replica is the one that is being removed, it will queue itself for removal with replicaGCQueue.

Note that a removed replica may not see the EndTransaction containing the ChangeReplicasTrigger. The ConfChange operation will be applied as soon as a quorum of nodes have committed it. If the removed replica is down or the message is dropped for some reason the removed replica will not be notified. The replica GC queue will eventually discover and cleanup this state.

When a new replica is added, it will have to catch up to the state of the other replicas. The Raft leader automatically handles this by either sending the new replica Raft log entries to apply, or by generating and sending a snapshot. See Replica.Snapshot and Replica.Entries.

Note that Replica.ChangeReplicas returns when the distributed transaction has been committed to a quorum of replicas in the range. The actual replication of data occurs asynchronously via a snapshot or application of Raft log entries. This is important for the replicate queue to be aware of. A node can process hundreds or thousands of ChangeReplicas operations per second even though the actual replication of data proceeds at a much slower base. In order to avoid having this background replication overwhelm the system, replication is throttled via a reservation system. When allocating a new replica for a range, the replicate queue reserves space for that replica on the target store via a ReservationRequest. (See StorePool.reserve). The reservation is fulfilled when the snapshot is applied.

TODO(peter): There is a rare scenario in which a replica can be brought up to date via Raft log replay. In this scenario, the reservation will be left dangling until it expires. See #7849.

TODO(peter): Describe preemptive snapshots. Preemptive snapshots are needed for the replicate queue to function properly. Currently the replicate queue will fire off as many replica additions as possible until it starts getting reservations denied at which point it will ignore the replica until the next scanner cycle.

func (*Replica) CheckConsistency 

func (r *Replica) CheckConsistency(
	args roachpb.CheckConsistencyRequest,
	desc *roachpb.RangeDescriptor,
) (roachpb.CheckConsistencyResponse, *roachpb.Error)

CheckConsistency runs a consistency check on the range. It first applies a ComputeChecksum command on the range. It then applies a VerifyChecksum command passing along a locally computed checksum for the range.

func (*Replica) ComputeChecksum 

func (r *Replica) ComputeChecksum(
	ctx context.Context,
	batch engine.ReadWriter,
	ms *enginepb.MVCCStats,
	h roachpb.Header,
	args roachpb.ComputeChecksumRequest,
) (roachpb.ComputeChecksumResponse, *PostCommitTrigger, error)

ComputeChecksum starts the process of computing a checksum on the replica at a particular snapshot. The checksum is later verified through the VerifyChecksum request.

func (*Replica) ConditionalPut 

func (r *Replica) ConditionalPut(
	ctx context.Context,
	batch engine.ReadWriter,
	ms *enginepb.MVCCStats,
	h roachpb.Header,
	args roachpb.ConditionalPutRequest,
) (roachpb.ConditionalPutResponse, error)

ConditionalPut sets the value for a specified key only if the expected value matches. If not, the return value contains the actual value.

func (*Replica) ContainsKey 

func (r *Replica) ContainsKey(key roachpb.Key) bool

ContainsKey returns whether this range contains the specified key.

func (*Replica) ContainsKeyRange 

func (r *Replica) ContainsKeyRange(start, end roachpb.Key) bool

ContainsKeyRange returns whether this range contains the specified key range from start to end.

func (*Replica) Delete 

func (r *Replica) Delete(
	ctx context.Context,
	batch engine.ReadWriter,
	ms *enginepb.MVCCStats,
	h roachpb.Header,
	args roachpb.DeleteRequest,
) (roachpb.DeleteResponse, error)

Delete deletes the key and value specified by key.

func (*Replica) DeleteRange 

func (r *Replica) DeleteRange(
	ctx context.Context,
	batch engine.ReadWriter,
	ms *enginepb.MVCCStats,
	h roachpb.Header,
	args roachpb.DeleteRangeRequest,
) (roachpb.DeleteRangeResponse, error)

DeleteRange deletes the range of key/value pairs specified by start and end keys.

func (*Replica) Desc 

func (r *Replica) Desc() *roachpb.RangeDescriptor

Desc returns the authoritative range descriptor, acquiring a replica lock in the process.

func (*Replica) Destroy 

func (r *Replica) Destroy(origDesc roachpb.RangeDescriptor) error

Destroy clears pending command queue by sending each pending command an error and cleans up all data associated with this range.

func (*Replica) EndTransaction 

func (r *Replica) EndTransaction(
	ctx context.Context,
	batch engine.ReadWriter,
	ms *enginepb.MVCCStats,
	h roachpb.Header,
	args roachpb.EndTransactionRequest,
) (roachpb.EndTransactionResponse, *PostCommitTrigger, error)

EndTransaction either commits or aborts (rolls back) an extant transaction according to the args.Commit parameter. Rolling back an already rolled-back txn is ok.

func (*Replica) Entries 

func (r *Replica) Entries(lo, hi, maxBytes uint64) ([]raftpb.Entry, error)

Entries implements the raft.Storage interface. Note that maxBytes is advisory and this method will always return at least one entry even if it exceeds maxBytes. Passing maxBytes equal to zero disables size checking. TODO(bdarnell): consider caching for recent entries, if rocksdb's built in caching is insufficient. Entries requires that the replica lock is held.

func (*Replica) FirstIndex 

func (r *Replica) FirstIndex() (uint64, error)

FirstIndex implements the raft.Storage interface. FirstIndex requires that the replica lock is held.

func (*Replica) GC 

func (r *Replica) GC(
	ctx context.Context,
	batch engine.ReadWriter,
	ms *enginepb.MVCCStats,
	h roachpb.Header,
	args roachpb.GCRequest,
) (roachpb.GCResponse, *PostCommitTrigger, error)

GC iterates through the list of keys to garbage collect specified in the arguments. MVCCGarbageCollect is invoked on each listed key along with the expiration timestamp. The GC metadata specified in the args is persisted after GC.

func (*Replica) Get 

func (r *Replica) Get(
	ctx context.Context, batch engine.ReadWriter, h roachpb.Header, args roachpb.GetRequest,
) (roachpb.GetResponse, *PostCommitTrigger, error)

Get returns the value for a specified key.

func (*Replica) GetFirstIndex 

func (r *Replica) GetFirstIndex() (uint64, error)

GetFirstIndex is the same function as FirstIndex but it does not require that the replica lock is held.

func (*Replica) GetMVCCStats 

func (r *Replica) GetMVCCStats() enginepb.MVCCStats

GetMVCCStats returns a copy of the MVCC stats object for this range.

func (*Replica) GetMaxBytes 

func (r *Replica) GetMaxBytes() int64

GetMaxBytes atomically gets the range maximum byte limit.

func (*Replica) GetReplicaDescriptor 

func (r *Replica) GetReplicaDescriptor() (roachpb.ReplicaDescriptor, error)

GetReplicaDescriptor returns the replica for this range from the range descriptor. Returns a *RangeNotFoundError if the replica is not found. No other errors are returned.

func (*Replica) GetSnapshot 

func (r *Replica) GetSnapshot(ctx context.Context) (raftpb.Snapshot, error)

GetSnapshot wraps Snapshot() but does not require the replica lock to be held and it will block instead of returning ErrSnapshotTemporaryUnavailable.

func (*Replica) HeartbeatTxn 

func (r *Replica) HeartbeatTxn(
	ctx context.Context,
	batch engine.ReadWriter,
	ms *enginepb.MVCCStats,
	h roachpb.Header,
	args roachpb.HeartbeatTxnRequest,
) (roachpb.HeartbeatTxnResponse, error)

HeartbeatTxn updates the transaction status and heartbeat timestamp after receiving transaction heartbeat messages from coordinator. Returns the updated transaction.

func (*Replica) Increment 

func (r *Replica) Increment(
	ctx context.Context,
	batch engine.ReadWriter,
	ms *enginepb.MVCCStats,
	h roachpb.Header,
	args roachpb.IncrementRequest,
) (roachpb.IncrementResponse, error)

Increment increments the value (interpreted as varint64 encoded) and returns the newly incremented value (encoded as varint64). If no value exists for the key, zero is incremented.

func (*Replica) InitPut 

func (r *Replica) InitPut(
	ctx context.Context,
	batch engine.ReadWriter,
	ms *enginepb.MVCCStats,
	h roachpb.Header,
	args roachpb.InitPutRequest,
) (roachpb.InitPutResponse, error)

InitPut sets the value for a specified key only if it doesn't exist. It returns an error if the key exists with an existing value that is different from the value provided.

func (*Replica) InitialState 

func (r *Replica) InitialState() (raftpb.HardState, raftpb.ConfState, error)

InitialState implements the raft.Storage interface. InitialState requires that the replica lock be held.

func (*Replica) IsFirstRange 

func (r *Replica) IsFirstRange() bool

IsFirstRange returns true if this is the first range.

func (*Replica) IsInitialized 

func (r *Replica) IsInitialized() bool

IsInitialized is true if we know the metadata of this range, either because we created it or we have received an initial snapshot from another node. It is false when a range has been created in response to an incoming message but we are waiting for our initial snapshot.

func (*Replica) LastIndex 

func (r *Replica) LastIndex() (uint64, error)

LastIndex implements the raft.Storage interface. LastIndex requires that the replica lock is held.

func (*Replica) Less 

func (r *Replica) Less(i btree.Item) bool

Less returns true if the range's end key is less than the given item's key.

func (*Replica) Merge 

func (r *Replica) Merge(
	ctx context.Context,
	batch engine.ReadWriter,
	ms *enginepb.MVCCStats,
	h roachpb.Header,
	args roachpb.MergeRequest,
) (roachpb.MergeResponse, error)

Merge is used to merge a value into an existing key. Merge is an efficient accumulation operation which is exposed by RocksDB, used by CockroachDB for the efficient accumulation of certain values. Due to the difficulty of making these operations transactional, merges are not currently exposed directly to clients. Merged values are explicitly not MVCC data.

func (*Replica) PushTxn 

func (r *Replica) PushTxn(
	ctx context.Context,
	batch engine.ReadWriter,
	ms *enginepb.MVCCStats,
	h roachpb.Header,
	args roachpb.PushTxnRequest,
) (roachpb.PushTxnResponse, error)

PushTxn resolves conflicts between concurrent txns (or between a non-transactional reader or writer and a txn) in several ways depending on the statuses and priorities of the conflicting transactions. The PushTxn operation is invoked by a "pusher" (the writer trying to abort a conflicting txn or the reader trying to push a conflicting txn's commit timestamp forward), who attempts to resolve a conflict with a "pushee" (args.PushTxn -- the pushee txn whose intent(s) caused the conflict). A pusher is either transactional, in which case PushTxn is completely initialized, or not, in which case the PushTxn has only the priority set.

Txn already committed/aborted: If pushee txn is committed or aborted return success.

Txn Timeout: If pushee txn entry isn't present or its LastHeartbeat timestamp isn't set, use its as LastHeartbeat. If current time - LastHeartbeat > 2 * DefaultHeartbeatInterval, then the pushee txn should be either pushed forward, aborted, or confirmed not pending, depending on value of Request.PushType.

Old Txn Epoch: If persisted pushee txn entry has a newer Epoch than PushTxn.Epoch, return success, as older epoch may be removed.

Lower Txn Priority: If pushee txn has a lower priority than pusher, adjust pushee's persisted txn depending on value of args.PushType. If args.PushType is PUSH_ABORT, set txn.Status to ABORTED, and priority to one less than the pusher's priority and return success. If args.PushType is PUSH_TIMESTAMP, set txn.Timestamp to just after PushTo.

Higher Txn Priority: If pushee txn has a higher priority than pusher, return TransactionPushError. Transaction will be retried with priority one less than the pushee's higher priority.

If the pusher is non-transactional, args.PusherTxn is an empty proto with only the priority set.

If the pushee is aborted, its timestamp will be forwarded to match its last client activity timestamp (i.e. last heartbeat), if available. This is done so that the updated timestamp populates the abort cache, allowing the GC queue to purge entries for which the transaction coordinator must have found out via its heartbeats that the transaction has failed.

func (*Replica) Put 

func (r *Replica) Put(
	ctx context.Context,
	batch engine.ReadWriter,
	ms *enginepb.MVCCStats,
	h roachpb.Header,
	args roachpb.PutRequest,
) (roachpb.PutResponse, error)

Put sets the value for a specified key.

func (*Replica) RaftStatus 

func (r *Replica) RaftStatus() *raft.Status

RaftStatus returns the current raft status of the replica. It returns nil if the Raft group has not been initialized yet.

func (*Replica) RangeLookup 

func (r *Replica) RangeLookup(
	ctx context.Context,
	batch engine.ReadWriter,
	h roachpb.Header,
	args roachpb.RangeLookupRequest,
) (roachpb.RangeLookupResponse, *PostCommitTrigger, error)

RangeLookup is used to look up RangeDescriptors - a RangeDescriptor is a metadata structure which describes the key range and replica locations of a distinct range in the cluster.

RangeDescriptors are stored as values in the cockroach cluster's key-value store. However, they are always stored using special "Range Metadata keys", which are "ordinary" keys with a special prefix prepended. The Range Metadata Key for an ordinary key can be generated with the `keys.RangeMetaKey(key)` function. The RangeDescriptor for the range which contains a given key can be retrieved by generating its Range Metadata Key and dispatching it to RangeLookup.

Note that the Range Metadata Key sent to RangeLookup is NOT the key at which the desired RangeDescriptor is stored. Instead, this method returns the RangeDescriptor stored at the _lowest_ existing key which is _greater_ than the given key. The returned RangeDescriptor will thus contain the ordinary key which was originally used to generate the Range Metadata Key sent to RangeLookup.

The "Range Metadata Key" for a range is built by appending the end key of the range to the respective meta prefix.

Lookups for range metadata keys usually want to read inconsistently, but some callers need a consistent result; both are supported.

This method has an important optimization in the inconsistent case: instead of just returning the request RangeDescriptor, it also returns a slice of additional range descriptors immediately consecutive to the desired RangeDescriptor. This is intended to serve as a sort of caching pre-fetch, so that the requesting nodes can aggressively cache RangeDescriptors which are likely to be desired by their current workload. The Reverse flag specifies whether descriptors are prefetched in descending or ascending order.

func (*Replica) RequestLease 

func (r *Replica) RequestLease(
	ctx context.Context,
	batch engine.ReadWriter,
	ms *enginepb.MVCCStats,
	h roachpb.Header,
	args roachpb.RequestLeaseRequest,
) (roachpb.RequestLeaseResponse, *PostCommitTrigger, error)

RequestLease sets the range lease for this range. The command fails only if the desired start timestamp collides with a previous lease. Otherwise, the start timestamp is wound back to right after the expiration of the previous lease (or zero). If this range replica is already the lease holder, the expiration will be extended or shortened as indicated. For a new lease, all duties required of the range lease holder are commenced, including clearing the command queue and timestamp cache.

func (*Replica) ResolveIntent 

func (r *Replica) ResolveIntent(
	ctx context.Context,
	batch engine.ReadWriter,
	ms *enginepb.MVCCStats,
	h roachpb.Header,
	args roachpb.ResolveIntentRequest,
) (roachpb.ResolveIntentResponse, error)

ResolveIntent resolves a write intent from the specified key according to the status of the transaction which created it.

func (*Replica) ResolveIntentRange 

func (r *Replica) ResolveIntentRange(
	ctx context.Context,
	batch engine.ReadWriter,
	ms *enginepb.MVCCStats,
	h roachpb.Header,
	args roachpb.ResolveIntentRangeRequest,
) (roachpb.ResolveIntentRangeResponse, error)

ResolveIntentRange resolves write intents in the specified key range according to the status of the transaction which created it.

func (*Replica) ReverseScan 

func (r *Replica) ReverseScan(
	ctx context.Context,
	batch engine.ReadWriter,
	h roachpb.Header,
	maxKeys int64,
	args roachpb.ReverseScanRequest,
) (roachpb.ReverseScanResponse, *PostCommitTrigger, error)

ReverseScan scans the key range specified by start key through end key in descending order up to some maximum number of results. maxKeys stores the number of scan results remaining for this batch (MaxInt64 for no limit).

func (*Replica) Scan 

func (r *Replica) Scan(
	ctx context.Context,
	batch engine.ReadWriter,
	h roachpb.Header,
	maxKeys int64,
	args roachpb.ScanRequest,
) (roachpb.ScanResponse, *PostCommitTrigger, error)

Scan scans the key range specified by start key through end key in ascending order up to some maximum number of results. maxKeys stores the number of scan results remaining for this batch (MaxInt64 for no limit).

func (*Replica) Send 

func (r *Replica) Send(ctx context.Context, ba roachpb.BatchRequest) (*roachpb.BatchResponse, *roachpb.Error)

Send adds a command for execution on this range. The command's affected keys are verified to be contained within the range and the range's lease is confirmed. The command is then dispatched either along the read-only execution path or the read-write Raft command queue.

func (*Replica) SetMaxBytes 

func (r *Replica) SetMaxBytes(maxBytes int64)

SetMaxBytes atomically sets the maximum byte limit before split. This value is cached by the range for efficiency.

func (*Replica) Snapshot 

func (r *Replica) Snapshot() (raftpb.Snapshot, error)

Snapshot implements the raft.Storage interface. Snapshot requires that the replica lock is held.

func (*Replica) SnapshotWithContext 

func (r *Replica) SnapshotWithContext(ctx context.Context) (raftpb.Snapshot, error)

SnapshotWithContext is main implementation for Snapshot() but it takes a context to allow tracing.

func (*Replica) State 

func (r *Replica) State() storagebase.RangeInfo

State returns a copy of the internal state of the Replica, along with some auxiliary information.

func (*Replica) String 

func (r *Replica) String() string

String returns the string representation of the replica using an inconsistent copy of the range descriptor. Therefore, String does not require a lock and its output may not be atomic with other ongoing work in the replica. This is done to prevent deadlocks in logging sites.

func (*Replica) Term 

func (r *Replica) Term(i uint64) (uint64, error)

Term implements the raft.Storage interface. Term requires that the replica lock is held.

func (*Replica) TransferLease 

func (r *Replica) TransferLease(
	ctx context.Context,
	batch engine.ReadWriter,
	ms *enginepb.MVCCStats,
	h roachpb.Header,
	args roachpb.TransferLeaseRequest,
) (roachpb.RequestLeaseResponse, *PostCommitTrigger, error)

TransferLease sets the lease holder for the range. Unlike with RequestLease(), the new lease is allowed to overlap the old one, the contract being that the transfer must have been initiated by the (soon ex-) lease holder which must have dropped all of its lease holder powers before proposing.

func (*Replica) TruncateLog 

func (r *Replica) TruncateLog(
	ctx context.Context,
	batch engine.ReadWriter,
	ms *enginepb.MVCCStats,
	h roachpb.Header,
	args roachpb.TruncateLogRequest,
) (roachpb.TruncateLogResponse, *PostCommitTrigger, error)

TruncateLog discards a prefix of the raft log. Truncating part of a log that has already been truncated has no effect. If this range is not the one specified within the request body, the request will also be ignored.

func (*Replica) VerifyChecksum 

func (r *Replica) VerifyChecksum(
	ctx context.Context,
	batch engine.ReadWriter,
	ms *enginepb.MVCCStats,
	h roachpb.Header,
	args roachpb.VerifyChecksumRequest,
) (roachpb.VerifyChecksumResponse, *PostCommitTrigger, error)

VerifyChecksum verifies the checksum that was computed through a ComputeChecksum request. This command is marked as IsWrite so that it executes on every replica, but it actually doesn't modify the persistent state on the replica.

Raft commands need to consistently execute on all replicas. An error seen on a particular replica should be returned here only if it is guaranteed to be seen on other replicas. In other words, a command needs to be consistent both in success and failure.

type ReplicaDataIterator 

type ReplicaDataIterator struct {
	// contains filtered or unexported fields
}

ReplicaDataIterator provides a complete iteration over all key / value rows in a range, including all system-local metadata and user data. The ranges keyRange slice specifies the key ranges which comprise all of the range's data.

A ReplicaDataIterator provides a subset of the engine.Iterator interface.

func NewReplicaDataIterator 

func NewReplicaDataIterator(
	d *roachpb.RangeDescriptor, e engine.Reader, replicatedOnly bool,
) *ReplicaDataIterator

NewReplicaDataIterator creates a ReplicaDataIterator for the given replica.

func (*ReplicaDataIterator) Close 

func (ri *ReplicaDataIterator) Close()

Close the underlying iterator.

func (*ReplicaDataIterator) Error 

func (ri *ReplicaDataIterator) Error() error

Error returns the error, if any, which the iterator encountered.

func (*ReplicaDataIterator) Key 

func (ri *ReplicaDataIterator) Key() engine.MVCCKey

Key returns the current key.

func (*ReplicaDataIterator) Next 

func (ri *ReplicaDataIterator) Next()

Next advances to the next key in the iteration.

func (*ReplicaDataIterator) Valid 

func (ri *ReplicaDataIterator) Valid() bool

Valid returns true if the iterator currently points to a valid value.

func (*ReplicaDataIterator) Value 

func (ri *ReplicaDataIterator) Value() []byte

Value returns the current value.

type ReplicaSnapshotDiff 

type ReplicaSnapshotDiff struct {
	// LeaseHolder is set to true of this k:v pair is only present on the lease
	// holder.
	LeaseHolder bool
	Key         roachpb.Key
	Timestamp   hlc.Timestamp
	Value       []byte
}

ReplicaSnapshotDiff is a part of a []ReplicaSnapshotDiff which represents a diff between two replica snapshots. For now it's only a diff between their KV pairs.

type Store 

type Store struct {
	Ident roachpb.StoreIdent
	// contains filtered or unexported fields
}

A Store maintains a map of ranges by start key. A Store corresponds to one physical device.

func NewStore 

func NewStore(ctx StoreContext, eng engine.Engine, nodeDesc *roachpb.NodeDescriptor) *Store

NewStore returns a new instance of a store.

func (*Store) AcquireRaftSnapshot 

func (s *Store) AcquireRaftSnapshot() bool

AcquireRaftSnapshot returns true if a new raft snapshot can start. If true is returned, the caller MUST call ReleaseRaftSnapshot.

func (*Store) AddReplicaTest 

func (s *Store) AddReplicaTest(rng *Replica) error

AddReplicaTest adds the replica to the store's replica map and to the sorted replicasByKey slice. To be used only by unittests.

func (*Store) Attrs 

func (s *Store) Attrs() roachpb.Attributes

Attrs returns the attributes of the underlying store.

func (*Store) Bootstrap 

func (s *Store) Bootstrap(ident roachpb.StoreIdent, stopper *stop.Stopper) error

Bootstrap writes a new store ident to the underlying engine. To ensure that no crufty data already exists in the engine, it scans the engine contents before writing the new store ident. The engine should be completely empty. It returns an error if called on a non-empty engine.

func (*Store) BootstrapRange 

func (s *Store) BootstrapRange(initialValues []roachpb.KeyValue) error

BootstrapRange creates the first range in the cluster and manually writes it to the store. Default range addressing records are created for meta1 and meta2. Default configurations for zones are created. All configs are specified for the empty key prefix, meaning they apply to the entire database. The zone requires three replicas with no other specifications. It also adds the range tree and the root node, the first range, to it. The 'initialValues' are written as well after each value's checksum is initialized.

func (*Store) Capacity 

func (s *Store) Capacity() (roachpb.StoreCapacity, error)

Capacity returns the capacity of the underlying storage engine. Note that this does not include reservations.

func (*Store) Clock 

func (s *Store) Clock() *hlc.Clock

Clock accessor.

func (*Store) ClusterID 

func (s *Store) ClusterID() uuid.UUID

ClusterID accessor.

func (*Store) ComputeMetrics 

func (s *Store) ComputeMetrics() error

ComputeMetrics immediately computes the current value of store metrics which cannot be computed incrementally. This method should be invoked periodically by a higher-level system which records store metrics.

func (*Store) ComputeStatsForKeySpan 

func (s *Store) ComputeStatsForKeySpan(startKey, endKey roachpb.RKey) (enginepb.MVCCStats, int)

ComputeStatsForKeySpan computes the aggregated MVCCStats for all replicas on this store which contain any keys in the supplied range.

func (*Store) DB 

func (s *Store) DB() *client.DB

DB accessor.

func (*Store) Descriptor 

func (s *Store) Descriptor() (*roachpb.StoreDescriptor, error)

Descriptor returns a StoreDescriptor including current store capacity information.

func (*Store) DrainLeases 

func (s *Store) DrainLeases(drain bool) error

DrainLeases (when called with 'true') prevents all of the Store's Replicas from acquiring or extending range leases and waits until all of them have expired. If an error is returned, the draining state is still active, but there may be active leases held by some of the Store's Replicas. When called with 'false', returns to the normal mode of operation.

func (*Store) Engine 

func (s *Store) Engine() engine.Engine

Engine accessor.

func (*Store) FrozenStatus 

func (s *Store) FrozenStatus(collectFrozen bool) (repDescs []roachpb.ReplicaDescriptor)

FrozenStatus returns all of the Store's Replicas which are frozen (if the parameter is true) or unfrozen (otherwise). It makes no attempt to prevent new data being rebalanced to the Store, and thus does not guarantee that the Store remains in the reported state.

func (*Store) GetReplica 

func (s *Store) GetReplica(rangeID roachpb.RangeID) (*Replica, error)

GetReplica fetches a replica by Range ID. Returns an error if no replica is found.

func (*Store) Gossip 

func (s *Store) Gossip() *gossip.Gossip

Gossip accessor.

func (*Store) GossipDeadReplicas 

func (s *Store) GossipDeadReplicas(ctx context.Context) error

GossipDeadReplicas broadcasts the stores dead replicas on the gossip network.

func (*Store) GossipStore 

func (s *Store) GossipStore(ctx context.Context) error

GossipStore broadcasts the store on the gossip network.

func (*Store) IsDrainingLeases 

func (s *Store) IsDrainingLeases() bool

IsDrainingLeases accessor.

func (*Store) IsStarted 

func (s *Store) IsStarted() bool

IsStarted returns true if the Store has been started.

func (*Store) LookupReplica 

func (s *Store) LookupReplica(start, end roachpb.RKey) *Replica

LookupReplica looks up a replica via binary search over the "replicasByKey" btree. Returns nil if no replica is found for specified key range. Note that the specified keys are transformed using Key.Address() to ensure we lookup replicas correctly for local keys. When end is nil, a replica that contains start is looked up.

func (*Store) MVCCStats 

func (s *Store) MVCCStats() enginepb.MVCCStats

MVCCStats returns the current MVCCStats accumulated for this store. TODO(mrtracy): This should be removed as part of #4465, this is only needed to support the current StatusSummary structures which will be changing.

func (*Store) MergeRange 

func (s *Store) MergeRange(subsumingRng *Replica, updatedEndKey roachpb.RKey, subsumedRangeID roachpb.RangeID) error

MergeRange expands the subsuming range to absorb the subsumed range. This merge operation will fail if the two ranges are not collocated on the same store. Must be called (perhaps indirectly) from the processRaft goroutine.

func (*Store) NewRangeDescriptor 

func (s *Store) NewRangeDescriptor(
	start, end roachpb.RKey, replicas []roachpb.ReplicaDescriptor,
) (*roachpb.RangeDescriptor, error)

NewRangeDescriptor creates a new descriptor based on start and end keys and the supplied roachpb.Replicas slice. It allocates a new range ID and returns a RangeDescriptor whose Replicas are a copy of the supplied replicas slice, with appropriate ReplicaIDs assigned.

func (*Store) NewSnapshot 

func (s *Store) NewSnapshot() engine.Reader

NewSnapshot creates a new snapshot engine.

func (*Store) RaftStatus 

func (s *Store) RaftStatus(rangeID roachpb.RangeID) *raft.Status

RaftStatus returns the current raft status of the local replica of the given range.

func (*Store) Registry 

func (s *Store) Registry() *metric.Registry

Registry returns the metric registry used by this store.

func (*Store) ReleaseRaftSnapshot 

func (s *Store) ReleaseRaftSnapshot()

ReleaseRaftSnapshot decrements the count of active snapshots.

func (*Store) RemoveReplica 

func (s *Store) RemoveReplica(rep *Replica, origDesc roachpb.RangeDescriptor, destroy bool) error

RemoveReplica removes the replica from the store's replica map and from the sorted replicasByKey btree. The version of the replica descriptor that was used to make the removal decision is passed in, and the removal is aborted if the replica ID has changed since then. If `destroy` is true, all data belonging to the replica will be deleted. In either case a tombstone record will be written.

func (*Store) ReplicaCount 

func (s *Store) ReplicaCount() int

ReplicaCount returns the number of replicas contained by this store.

func (*Store) Reserve 

func (s *Store) Reserve(ctx context.Context, req roachpb.ReservationRequest) roachpb.ReservationResponse

Reserve requests a reservation from the store's bookie.

func (*Store) Send 

func (s *Store) Send(ctx context.Context, ba roachpb.BatchRequest) (br *roachpb.BatchResponse, pErr *roachpb.Error)

Send fetches a range based on the header's replica, assembles method, args & reply into a Raft Cmd struct and executes the command using the fetched range. An incoming request may be transactional or not. If it is not transactional, the timestamp at which it executes may be higher than that optionally specified through the incoming BatchRequest, and it is not guaranteed that all operations are written at the same timestamp. If it is transactional, a timestamp must not be set - it is deduced automatically from the transaction. In particular, the read (original) timestamp will be used for all reads _and writes_ (see the TxnMeta.OrigTimestamp for details).

Should a transactional operation be forced to a higher timestamp (for instance due to the timestamp cache or finding a committed value in the path of one of its writes), the response will have a transaction set which should be used to update the client transaction.

func (*Store) SplitRange 

func (s *Store) SplitRange(origRng, newRng *Replica) error

SplitRange shortens the original range to accommodate the new range. The new range is added to the ranges map and the replicasByKey btree. processRaftMu must be held.

This is only called from the split trigger in the context of the execution of a Raft command (so processRaftMu *is* held).

func (*Store) Start 

func (s *Store) Start(stopper *stop.Stopper) error

Start the engine, set the GC and read the StoreIdent.

func (*Store) Stopper 

func (s *Store) Stopper() *stop.Stopper

Stopper accessor.

func (*Store) StoreID 

func (s *Store) StoreID() roachpb.StoreID

StoreID accessor.

func (*Store) String 

func (s *Store) String() string

String formats a store for debug output.

func (*Store) TestingKnobs 

func (s *Store) TestingKnobs() *StoreTestingKnobs

TestingKnobs accessor.

func (*Store) Tracer 

func (s *Store) Tracer() opentracing.Tracer

Tracer accessor.

func (*Store) WaitForInit 

func (s *Store) WaitForInit()

WaitForInit waits for any asynchronous processes begun in Start() to complete their initialization. In particular, this includes gossiping. In some cases this may block until the range GC queue has completed its scan. Only for testing.

type StoreContext 

type StoreContext struct {
	Clock     *hlc.Clock
	DB        *client.DB
	Gossip    *gossip.Gossip
	StorePool *StorePool
	Transport *RaftTransport

	// SQLExecutor is used by the store to execute SQL statements in a way that
	// is more direct than using a sql.Executor.
	SQLExecutor sqlutil.InternalExecutor

	// RangeRetryOptions are the retry options when retryable errors are
	// encountered sending commands to ranges.
	RangeRetryOptions retry.Options

	// RaftTickInterval is the resolution of the Raft timer; other raft timeouts
	// are defined in terms of multiples of this value.
	RaftTickInterval time.Duration

	// RaftHeartbeatIntervalTicks is the number of ticks that pass between heartbeats.
	RaftHeartbeatIntervalTicks int

	// RaftElectionTimeoutTicks is the number of ticks that must pass before a follower
	// considers a leader to have failed and calls a new election. Should be significantly
	// higher than RaftHeartbeatIntervalTicks. The raft paper recommends a value of 150ms
	// for local networks.
	RaftElectionTimeoutTicks int

	// ScanInterval is the default value for the scan interval
	ScanInterval time.Duration

	// ScanMaxIdleTime is the maximum time the scanner will be idle between ranges.
	// If enabled (> 0), the scanner may complete in less than ScanInterval for small
	// stores.
	ScanMaxIdleTime time.Duration

	// ConsistencyCheckInterval is the default time period in between consecutive
	// consistency checks on a range.
	ConsistencyCheckInterval time.Duration

	// ConsistencyCheckPanicOnFailure causes the node to panic when it detects a
	// replication consistency check failure.
	ConsistencyCheckPanicOnFailure bool

	// AllocatorOptions configures how the store will attempt to rebalance its
	// replicas to other stores.
	AllocatorOptions AllocatorOptions

	// Tracer is a request tracer.
	Tracer opentracing.Tracer

	// If LogRangeEvents is true, major changes to ranges will be logged into
	// the range event log.
	LogRangeEvents bool

	// BlockingSnapshotDuration is the amount of time Replica.Snapshot
	// will wait before switching to asynchronous mode. Zero is a good
	// choice for production but non-zero values can speed up tests.
	// (This only blocks on the first attempt; it will not block a
	// second time if the generation is still in progress).
	BlockingSnapshotDuration time.Duration

	// AsyncSnapshotMaxAge is the maximum amount of time that an
	// asynchronous snapshot will be held while waiting for raft to pick
	// it up (counted from when the snapshot generation is completed).
	AsyncSnapshotMaxAge time.Duration

	TestingKnobs StoreTestingKnobs
	// contains filtered or unexported fields
}

A StoreContext encompasses the auxiliary objects and configuration required to create a store. All fields holding a pointer or an interface are required to create a store; the rest will have sane defaults set if omitted.

func TestStoreContext 

func TestStoreContext() StoreContext

TestStoreContext has some fields initialized with values relevant in tests.

func (*StoreContext) Valid 

func (sc *StoreContext) Valid() bool

Valid returns true if the StoreContext is populated correctly. We don't check for Gossip and DB since some of our tests pass that as nil.

type StoreList 

type StoreList struct {
	// contains filtered or unexported fields
}

StoreList holds a list of store descriptors and associated count and used stats for those stores.

type StorePool 

type StorePool struct {
	// contains filtered or unexported fields
}

StorePool maintains a list of all known stores in the cluster and information on their health.

func NewStorePool 

func NewStorePool(
	g *gossip.Gossip,
	clock *hlc.Clock,
	rpcContext *rpc.Context,
	reservationsEnabled bool,
	timeUntilStoreDead time.Duration,
	stopper *stop.Stopper,
) *StorePool

NewStorePool creates a StorePool and registers the store updating callback with gossip.

type StoreTestingKnobs 

type StoreTestingKnobs struct {
	// A callback to be called when executing every replica command.
	// If your filter is not idempotent, consider wrapping it in a
	// ReplayProtectionFilterWrapper.
	TestingCommandFilter storagebase.ReplicaCommandFilter
	// A callback to be called instead of panicking due to a
	// checksum mismatch in VerifyChecksum()
	BadChecksumPanic func([]ReplicaSnapshotDiff)
	// Disables the use of one phase commits.
	DisableOnePhaseCommits bool
	// A hack to manipulate the clock before sending a batch request to a replica.
	// TODO(kaneda): This hook is not encouraged to use. Get rid of it once
	// we make TestServer take a ManualClock.
	ClockBeforeSend func(*hlc.Clock, roachpb.BatchRequest)
	// LeaseTransferBlockedOnExtensionEvent, if set, is called when
	// replica.TransferLease() encounters an in-progress lease extension.
	// nextLeader is the replica that we're trying to transfer the lease to.
	LeaseTransferBlockedOnExtensionEvent func(nextLeader roachpb.ReplicaDescriptor)
	// DisableSplitQueue disables the split queue.
	DisableSplitQueue bool
	// DisableReplicateQueue disables the replication queue.
	DisableReplicateQueue bool
	// DisableScanner disables the replica scanner.
	DisableScanner bool
}

StoreTestingKnobs is a part of the context used to control parts of the system.

func (*StoreTestingKnobs) ModuleTestingKnobs 

func (*StoreTestingKnobs) ModuleTestingKnobs()

ModuleTestingKnobs is part of the base.ModuleTestingKnobs interface.

type Stores 

type Stores struct {
	// contains filtered or unexported fields
}

A Stores provides methods to access a collection of stores. There's a visitor pattern and also an implementation of the client.Sender interface which directs a call to the appropriate store based on the call's key range. Stores also implements the gossip.Storage interface, which allows gossip bootstrap information to be persisted consistently to every store and the most recent bootstrap information to be read at node startup.

func NewStores 

func NewStores(clock *hlc.Clock) *Stores

NewStores returns a local-only sender which directly accesses a collection of stores.

func (*Stores) AddStore 

func (ls *Stores) AddStore(s *Store)

AddStore adds the specified store to the store map.

func (*Stores) FirstRange 

func (ls *Stores) FirstRange() (*roachpb.RangeDescriptor, error)

FirstRange implements the RangeDescriptorDB interface. It returns the range descriptor which contains KeyMin.

func (*Stores) GetStore 

func (ls *Stores) GetStore(storeID roachpb.StoreID) (*Store, error)

GetStore looks up the store by store ID. Returns an error if not found.

func (*Stores) GetStoreCount 

func (ls *Stores) GetStoreCount() int

GetStoreCount returns the number of stores this node is exporting.

func (*Stores) HasStore 

func (ls *Stores) HasStore(storeID roachpb.StoreID) bool

HasStore returns true if the specified store is owned by this Stores.

func (*Stores) LookupReplica 

func (ls *Stores) LookupReplica(start, end roachpb.RKey) (rangeID roachpb.RangeID, repDesc roachpb.ReplicaDescriptor, err error)

LookupReplica looks up replica by key [range]. Lookups are done by consulting each store in turn via Store.LookupReplica(key). Returns RangeID and replica on success; RangeKeyMismatch error if not found. If end is nil, a replica containing start is looked up. This is only for testing usage; performance doesn't matter.

func (*Stores) RangeLookup 

func (ls *Stores) RangeLookup(
	key roachpb.RKey, _ *roachpb.RangeDescriptor, considerIntents, useReverseScan bool,
) ([]roachpb.RangeDescriptor, []roachpb.RangeDescriptor, *roachpb.Error)

RangeLookup implements the RangeDescriptorDB interface. This implementation of RangeDescriptorDB seems to only be used by LocalTestCluster.

func (*Stores) ReadBootstrapInfo 

func (ls *Stores) ReadBootstrapInfo(bi *gossip.BootstrapInfo) error

ReadBootstrapInfo implements the gossip.Storage interface. Read attempts to read gossip bootstrap info from every known store and finds the most recent from all stores to initialize the bootstrap info argument. Returns an error on any issues reading data for the stores (but excluding the case in which no data has been persisted yet).

func (*Stores) RemoveStore 

func (ls *Stores) RemoveStore(s *Store)

RemoveStore removes the specified store from the store map.

func (*Stores) Send 

func (ls *Stores) Send(ctx context.Context, ba roachpb.BatchRequest) (*roachpb.BatchResponse, *roachpb.Error)

Send implements the client.Sender interface. The store is looked up from the store map if specified by the request; otherwise, the command is being executed locally, and the replica is determined via lookup through each store's LookupRange method. The latter path is taken only by unit tests.

func (*Stores) VisitStores 

func (ls *Stores) VisitStores(visitor func(s *Store) error) error

VisitStores implements a visitor pattern over stores in the storeMap. The specified function is invoked with each store in turn. Care is taken to invoke the visitor func without the lock held to avoid inconsistent lock orderings, as some visitor functions may call back into the Stores object. Stores are visited in random order.

func (*Stores) WriteBootstrapInfo 

func (ls *Stores) WriteBootstrapInfo(bi *gossip.BootstrapInfo) error

WriteBootstrapInfo implements the gossip.Storage interface. Write persists the supplied bootstrap info to every known store. Returns nil on success; otherwise returns first error encountered writing to the stores.

Source Files

View all Source files

Directories

Path Synopsis
Package engine provides low-level storage.
 Package engine provides low-level storage.
enginepb
Package enginepb is a generated protocol buffer package.
 Package enginepb is a generated protocol buffer package.
rocksdb
Package storagebase is a generated protocol buffer package.
 Package storagebase is a generated protocol buffer package.

Jump to

Keyboard shortcuts

? : This menu
/ : Search site
f or F : Jump to
y or Y : Canonical URL
go.dev uses cookies from Google to deliver and enhance the quality of its services and to analyze traffic. Learn more.