wrangler

package
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 Go to latest Published: Oct 21, 2014 License: BSD-3-Clause Imports: 28 Imported by: 0

Documentation

Overview

wrangler contains the Wrangler object to manage complex topology actions.

Index

Constants

View Source 
const ChangeSlaveTypeActionName = "ChangeSlaveTypeAction"
View Source 
const (
	SLAVE_STATUS_DEADLINE = 10e9
)
View Source 
const StartBlpActionName = "StartBlpAction"
View Source 
const StartSlaveActionName = "StartSlaveAction"
View Source 
const TabletTagActionName = "TabletTagAction"

Variables

View Source 
var (
	// DefaultActionTimeout is a good default for interactive
	// remote actions. We usually take a lock then do an action,
	// so basing this to be greater than DefaultLockTimeout is good.
	DefaultActionTimeout = actionnode.DefaultLockTimeout * 4
)

Functions

func RecordChangeSlaveTypeAction 

func RecordChangeSlaveTypeAction(cleaner *Cleaner, tabletAlias topo.TabletAlias, tabletType topo.TabletType)

RecordChangeSlaveTypeAction records a new ChangeSlaveTypeAction into the specified Cleaner

func RecordStartBlpAction 

func RecordStartBlpAction(cleaner *Cleaner, tabletInfo *topo.TabletInfo, waitTime time.Duration)

RecordStartBlpAction records a new StartBlpAction into the specified Cleaner

func RecordStartSlaveAction 

func RecordStartSlaveAction(cleaner *Cleaner, tabletInfo *topo.TabletInfo, waitTime time.Duration)

RecordStartSlaveAction records a new StartSlaveAction into the specified Cleaner

func RecordTabletTagAction 

func RecordTabletTagAction(cleaner *Cleaner, tabletAlias topo.TabletAlias, name, value string)

RecordTabletTagAction records a new TabletTagAction into the specified Cleaner

func SignalInterrupt 

func SignalInterrupt()

SignalInterrupt needs to be called when a signal interrupts the current process.

func WriteAddr 

func WriteAddr(zconn zk.Conn, zkPath string, addr *zkns.ZknsAddr) error

func WriteAddrs 

func WriteAddrs(zconn zk.Conn, zkPath string, addrs *LegacyZknsAddrs) error

Types

type ChangeSlaveTypeAction 

type ChangeSlaveTypeAction struct {
	TabletAlias topo.TabletAlias
	TabletType  topo.TabletType
}

ChangeSlaveTypeAction will change a server type to another type

func FindChangeSlaveTypeActionByTarget 

func FindChangeSlaveTypeActionByTarget(cleaner *Cleaner, tabletAlias topo.TabletAlias) (*ChangeSlaveTypeAction, error)

FindChangeSlaveTypeActionByTarget finds the first action for the target

func (ChangeSlaveTypeAction) CleanUp 

func (csta ChangeSlaveTypeAction) CleanUp(wr *Wrangler) error

CleanUp is part of CleanerAction interface.

type Cleaner 

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

Cleaner remembers a list of cleanup steps to perform. Just record action cleanup steps, and execute them at the end in reverse order, with various guarantees.

func (*Cleaner) CleanUp 

func (cleaner *Cleaner) CleanUp(wr *Wrangler) error

CleanUp will run the recorded actions. If an action on a target fails, it will not run the next action on the same target. We return the aggregate errors for all cleanups. TODO(alainjobart) Actions should run concurrently on a per target basis. They are then serialized on each target.

func (*Cleaner) GetActionByName 

func (cleaner *Cleaner) GetActionByName(name, target string) (CleanerAction, error)

GetActionByName returns the first action in the list with the given name and target

func (*Cleaner) Record 

func (cleaner *Cleaner) Record(name, target string, action CleanerAction)

Record will add a cleaning action to the list

func (*Cleaner) RemoveActionByName 

func (cleaner *Cleaner) RemoveActionByName(name, target string) error

RemoveActionByName removes an action from the cleaner list

type CleanerAction 

type CleanerAction interface {
	CleanUp(wr *Wrangler) error
}

CleanerAction is the interface that clean-up actions need to implement

type LegacyZknsAddrs 

type LegacyZknsAddrs struct {
	Endpoints []string `json:"endpoints"`
}

type StartBlpAction 

type StartBlpAction struct {
	TabletInfo *topo.TabletInfo
	WaitTime   time.Duration
}

StartBlpAction will restart binlog replication on a server

func (StartBlpAction) CleanUp 

func (sba StartBlpAction) CleanUp(wr *Wrangler) error

CleanUp is part of CleanerAction interface.

type StartSlaveAction 

type StartSlaveAction struct {
	TabletInfo *topo.TabletInfo
	WaitTime   time.Duration
}

StartSlaveAction will restart binlog replication on a server

func (StartSlaveAction) CleanUp 

func (sba StartSlaveAction) CleanUp(wr *Wrangler) error

CleanUp is part of CleanerAction interface.

type TabletStatus 

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

local structure used to keep track of what we're doing

type TabletTagAction 

type TabletTagAction struct {
	TabletAlias topo.TabletAlias
	Name        string
	Value       string
}

TabletTagAction will add / remove a tag to a tablet. If Value is empty, will remove the tag.

func (TabletTagAction) CleanUp 

func (tta TabletTagAction) CleanUp(wr *Wrangler) error

CleanUp is part of CleanerAction interface.

type Wrangler 

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

Wrangler manages complex actions on the topology, like reparents, snapshots, restores, ... It is not a thread safe structure. Two go routines cannot usually call wrangler methods at the same time (they probably would not have the same logger, and definitely not the same timeouts / deadlines).

func New 

func New(logger logutil.Logger, ts topo.Server, actionTimeout, lockTimeout time.Duration) *Wrangler

New creates a new Wrangler object.

actionTimeout: how long should we wait for an action to complete?

  • if using wrangler for just one action, this is set properly upon wrangler creation.
  • if re-using wrangler multiple times, call ResetActionTimeout before every action.

lockTimeout: how long should we wait for the initial lock to start a complex action? This is distinct from actionTimeout because most of the time, we want to immediately know that our action will fail. However, automated action will need some time to arbitrate the locks.

func (*Wrangler) ActionTimeout 

func (wr *Wrangler) ActionTimeout() time.Duration

ActionTimeout returns the timeout to use so the action finishes before the deadline.

func (*Wrangler) ApplySchema 

func (wr *Wrangler) ApplySchema(tabletAlias topo.TabletAlias, sc *myproto.SchemaChange) (*myproto.SchemaChangeResult, error)

ApplySchema will apply a schema change on the remote tablet.

func (*Wrangler) ApplySchemaKeyspace 

func (wr *Wrangler) ApplySchemaKeyspace(keyspace string, change string, simple, force bool) (*myproto.SchemaChangeResult, error)

apply a schema change to an entire keyspace. take a keyspace lock to do this. first we will validate the Preflight works the same on all shard masters and fail if not (unless force is specified) if simple, we just do it on all masters. if complex, we do the shell game in parallel on all shards

func (*Wrangler) ApplySchemaShard 

func (wr *Wrangler) ApplySchemaShard(keyspace, shard, change string, newParentTabletAlias topo.TabletAlias, simple, force bool) (*myproto.SchemaChangeResult, error)

Note for 'complex' mode (the 'simple' mode is easy enough that we don't need to handle recovery that much): this method is able to recover if interrupted in the middle, because it knows which server has the schema change already applied, and will just pass through them very quickly.

func (*Wrangler) ChangeType 

func (wr *Wrangler) ChangeType(tabletAlias topo.TabletAlias, tabletType topo.TabletType, force bool) error

Change the type of tablet and recompute all necessary derived paths in the serving graph. If force is true, it will bypass the RPC action system and make the data change directly, and not run the remote hooks.

Note we don't update the master record in the Shard here, as we can't ChangeType from and out of master anyway.

func (*Wrangler) ChangeTypeNoRebuild 

func (wr *Wrangler) ChangeTypeNoRebuild(tabletAlias topo.TabletAlias, tabletType topo.TabletType, force bool) (rebuildRequired bool, cell, keyspace, shard string, err error)

ChangeTypeNoRebuild changes a tablet's type, and returns whether there's a shard that should be rebuilt, along with its cell, keyspace, and shard. If force is true, it will bypass the RPC action system and make the data change directly, and not run the remote hooks.

Note we don't update the master record in the Shard here, as we can't ChangeType from and out of master anyway.

func (*Wrangler) Clone 

func (wr *Wrangler) Clone(srcTabletAlias topo.TabletAlias, dstTabletAliases []topo.TabletAlias, forceMasterSnapshot bool, snapshotConcurrency, fetchConcurrency, fetchRetryCount int, serverMode bool) error

Clone will do all the necessary actions to copy all the data from a source to a set of destinations.

func (*Wrangler) DeleteShard 

func (wr *Wrangler) DeleteShard(keyspace, shard string) error

DeleteShard will do all the necessary changes in the topology server to entirely remove a shard. It can only work if there are no tablets in that shard.

func (*Wrangler) DeleteTablet 

func (wr *Wrangler) DeleteTablet(tabletAlias topo.TabletAlias) error

DeleteTablet will get the tablet record, and if it's scrapped, will delete the record from the topology.

func (*Wrangler) ExecuteFetch 

func (wr *Wrangler) ExecuteFetch(tabletAlias topo.TabletAlias, query string, maxRows int, wantFields, disableBinlogs bool) (*mproto.QueryResult, error)

ExecuteFetch will get data from a remote tablet

func (*Wrangler) ExecuteHook 

func (wr *Wrangler) ExecuteHook(tabletAlias topo.TabletAlias, hook *hk.Hook) (hookResult *hk.HookResult, err error)

func (*Wrangler) ExecuteOptionalTabletInfoHook 

func (wr *Wrangler) ExecuteOptionalTabletInfoHook(ti *topo.TabletInfo, hook *hk.Hook) (err error)

Execute a hook and returns an error only if the hook failed, not if the hook doesn't exist.

func (*Wrangler) ExecuteTabletInfoHook 

func (wr *Wrangler) ExecuteTabletInfoHook(ti *topo.TabletInfo, hook *hk.Hook) (hookResult *hk.HookResult, err error)

func (*Wrangler) ExportZkns 

func (wr *Wrangler) ExportZkns(cell string) error

Export addresses from the VT serving graph to a legacy zkns server. Note these functions only work with a zktopo.

func (*Wrangler) ExportZknsForKeyspace 

func (wr *Wrangler) ExportZknsForKeyspace(keyspace string) error

Export addresses from the VT serving graph to a legacy zkns server.

func (*Wrangler) GetPermissions 

func (wr *Wrangler) GetPermissions(tabletAlias topo.TabletAlias) (*myproto.Permissions, error)

func (*Wrangler) GetSchema 

func (wr *Wrangler) GetSchema(tabletAlias topo.TabletAlias, tables, excludeTables []string, includeViews bool) (*myproto.SchemaDefinition, error)

GetSchema uses an RPC to get the schema from a remote tablet

func (*Wrangler) GetVersion 

func (wr *Wrangler) GetVersion(tabletAlias topo.TabletAlias) (string, error)

func (*Wrangler) InitTablet 

func (wr *Wrangler) InitTablet(tablet *topo.Tablet, force, createShardAndKeyspace, update bool) error

InitTablet creates or updates a tablet. If no parent is specified in the tablet, and the tablet has a slave type, we will find the appropriate parent. If createShardAndKeyspace is true and the parent keyspace or shard don't exist, they will be created. If update is true, and a tablet with the same ID exists, update it. If Force is true, and a tablet with the same ID already exists, it will be scrapped and deleted, and then recreated.

func (*Wrangler) Logger 

func (wr *Wrangler) Logger() logutil.Logger

Logger returns the logger associated with this wrangler.

func (*Wrangler) MigrateServedFrom 

func (wr *Wrangler) MigrateServedFrom(keyspace, shard string, servedType topo.TabletType, reverse, skipRebuild bool) error

MigrateServedFrom is used during vertical splits to migrate a served type from a keyspace to another.

func (*Wrangler) MigrateServedTypes 

func (wr *Wrangler) MigrateServedTypes(keyspace, shard string, servedType topo.TabletType, reverse, skipRebuild bool) error

MigrateServedTypes is used during horizontal splits to migrate a served type from a list of shards to another.

func (*Wrangler) MultiRestore 

func (wr *Wrangler) MultiRestore(dstTabletAlias topo.TabletAlias, sources []topo.TabletAlias, concurrency, fetchConcurrency, insertTableConcurrency, fetchRetryCount int, strategy string) (err error)

func (*Wrangler) MultiSnapshot 

func (wr *Wrangler) MultiSnapshot(keyRanges []key.KeyRange, tabletAlias topo.TabletAlias, concurrency int, tables, excludeTables []string, forceMasterSnapshot, skipSlaveRestart bool, maximumFilesize uint64) (manifests []string, parent topo.TabletAlias, err error)

func (*Wrangler) PreflightSchema 

func (wr *Wrangler) PreflightSchema(tabletAlias topo.TabletAlias, change string) (*myproto.SchemaChangeResult, error)

PreflightSchema will try a schema change on the remote tablet.

func (*Wrangler) RebuildKeyspaceGraph 

func (wr *Wrangler) RebuildKeyspaceGraph(keyspace string, cells []string, shardCache map[string]*topo.ShardInfo) error

Rebuild the serving graph data while locking out other changes. If some shards were recently read / updated, pass them in the cache so we don't read them again (and possible get stale replicated data)

func (*Wrangler) RebuildReplicationGraph 

func (wr *Wrangler) RebuildReplicationGraph(cells []string, keyspaces []string) error

This is a quick and dirty tool to resurrect the TopologyServer data from the canonical data stored in the tablet nodes.

cells: local vt cells to scan for all tablets keyspaces: list of keyspaces to rebuild

func (*Wrangler) RebuildShardGraph 

func (wr *Wrangler) RebuildShardGraph(keyspace, shard string, cells []string) error

Rebuild the serving and replication rollup data data while locking out other changes.

func (*Wrangler) RefreshTablesByShard 

func (wr *Wrangler) RefreshTablesByShard(keyspace, shard string, tabletType topo.TabletType) error

RefreshTablesByShard calls RefreshState on all the tables of a given type in a shard. It would work for the master, but the discovery wouldn't be very efficient.

func (*Wrangler) ReloadSchema 

func (wr *Wrangler) ReloadSchema(tabletAlias topo.TabletAlias) error

ReloadSchema forces the remote tablet to reload its schema.

func (*Wrangler) RemoveShardCell 

func (wr *Wrangler) RemoveShardCell(keyspace, shard, cell string, force bool) error

RemoveShardCell will remove a cell from the Cells list in a shard. It will first check the shard has no tablets there. if 'force' is specified, it will remove the cell even when the tablet map cannot be retrieved. This is intended to be used when a cell is completely down and its topology server cannot even be reached.

func (*Wrangler) ReparentShard 

func (wr *Wrangler) ReparentShard(keyspace, shard string, masterElectTabletAlias topo.TabletAlias, leaveMasterReadOnly, forceReparentToCurrentMaster bool) error

ReparentShard creates the reparenting action and launches a goroutine to coordinate the procedure.

leaveMasterReadOnly: leave the master in read-only mode, even 

though all the other necessary updates have been made.

forceReparentToCurrentMaster: mostly for test setups, this can 

cause data loss.

func (*Wrangler) ReparentTablet 

func (wr *Wrangler) ReparentTablet(tabletAlias topo.TabletAlias) error

ReparentTablet attempts to reparent this tablet to the current master, based on the current replication position. If there is no match, it will fail.

func (*Wrangler) ReserveForRestore 

func (wr *Wrangler) ReserveForRestore(srcTabletAlias, dstTabletAlias topo.TabletAlias) (err error)

ReserveForRestore will make sure a tablet is ready to be used as a restore target.

func (*Wrangler) ResetActionTimeout 

func (wr *Wrangler) ResetActionTimeout(actionTimeout time.Duration)

ResetActionTimeout should be used before every action on a wrangler object that is going to be re-used: - vtctl will not call this, as it does one action - vtctld will call this, as it re-uses the same wrangler for actions

func (*Wrangler) Restore 

func (wr *Wrangler) Restore(srcTabletAlias topo.TabletAlias, srcFilePath string, dstTabletAlias, parentAlias topo.TabletAlias, fetchConcurrency, fetchRetryCount int, wasReserved, dontWaitForSlaveStart bool) error

Restore actually performs the restore action on a tablet.

func (*Wrangler) Scrap 

func (wr *Wrangler) Scrap(tabletAlias topo.TabletAlias, force, skipRebuild bool) error

Scrap a tablet. If force is used, we write to topo.Server directly and don't remote-execute the command.

If we scrap the master for a shard, we will clear its record from the Shard object (only if that was the right master)

func (*Wrangler) SetKeyspaceShardingInfo 

func (wr *Wrangler) SetKeyspaceShardingInfo(keyspace, shardingColumnName string, shardingColumnType key.KeyspaceIdType, splitShardCount int32, force bool) error

SetKeyspaceShardingInfo locks a keyspace and sets its ShardingColumnName and ShardingColumnType

func (*Wrangler) SetLogger 

func (wr *Wrangler) SetLogger(logger logutil.Logger)

SetLogger can be used to change the current logger. Not synchronized, no calls to this wrangler should be in progress.

func (*Wrangler) SetShardBlacklistedTables 

func (wr *Wrangler) SetShardBlacklistedTables(keyspace, shard string, tabletType topo.TabletType, tables []string) error

SetShardBlacklistedTables changes the BlacklistedTablesMap parameter of a shard. It does not rebuild any serving graph or do any consistency check.

func (*Wrangler) SetShardServedTypes 

func (wr *Wrangler) SetShardServedTypes(keyspace, shard string, servedTypes []topo.TabletType) error

SetShardServedTypes changes the ServedTypes parameter of a shard. It does not rebuild any serving graph or do any consistency check (yet).

func (*Wrangler) SetSourceShards 

func (wr *Wrangler) SetSourceShards(keyspace, shard string, sources []topo.TabletAlias, tables []string) error

func (*Wrangler) ShardExternallyReparented 

func (wr *Wrangler) ShardExternallyReparented(keyspace, shard string, masterElectTabletAlias topo.TabletAlias) error

ShardExternallyReparented updates the topology after the master tablet in a keyspace/shard has changed. We trust that whoever made the change completed the change successfully. We lock the shard while doing the update. We will then rebuild the serving graph in the cells that need it (the old master cell and the new master cell)

func (*Wrangler) ShardMultiRestore 

func (wr *Wrangler) ShardMultiRestore(keyspace, shard string, sources []topo.TabletAlias, tables []string, concurrency, fetchConcurrency, insertTableConcurrency, fetchRetryCount int, strategy string) error

func (*Wrangler) ShardReplicationStatuses 

func (wr *Wrangler) ShardReplicationStatuses(keyspace, shard string) ([]*topo.TabletInfo, []*myproto.ReplicationStatus, error)

ShardReplicationStatuses returns the ReplicationStatus for each tablet in a shard.

func (*Wrangler) Snapshot 

func (wr *Wrangler) Snapshot(tabletAlias topo.TabletAlias, forceMasterSnapshot bool, snapshotConcurrency int, serverMode bool) (*actionnode.SnapshotReply, topo.TabletType, error)

Snapshot takes a tablet snapshot.

forceMasterSnapshot: Normally a master is not a viable tablet to snapshot. However, there are degenerate cases where you need to override this, for instance the initial clone of a new master.

serverMode: if specified, the server will stop its mysqld, and be ready to serve the data files directly. Slaves can just download these and use them directly. Call SnapshotSourceEnd to return into serving mode. If not specified, the server will create an archive of the files, store them locally, and restart.

If error is nil, returns the SnapshotReply from the remote host, and the original type the server was before the snapshot.

func (*Wrangler) SnapshotSourceEnd 

func (wr *Wrangler) SnapshotSourceEnd(tabletAlias topo.TabletAlias, slaveStartRequired, readWrite bool, originalType topo.TabletType) (err error)

SnapshotSourceEnd will change the tablet back to its original type once it's done serving backups.

func (*Wrangler) TabletManagerClient 

func (wr *Wrangler) TabletManagerClient() tmclient.TabletManagerClient

TabletManagerClient returns the tmclient.TabletManagerClient this wrangler is using.

func (*Wrangler) TopoServer 

func (wr *Wrangler) TopoServer() topo.Server

TopoServer returns the topo.Server this wrangler is using.

func (*Wrangler) UnreserveForRestore 

func (wr *Wrangler) UnreserveForRestore(dstTabletAlias topo.TabletAlias) (err error)

UnreserveForRestore switches the tablet back to its original state, the restore won't happen.

func (*Wrangler) UnreserveForRestoreMulti 

func (wr *Wrangler) UnreserveForRestoreMulti(dstTabletAliases []topo.TabletAlias)

UnreserveForRestoreMulti calls UnreserveForRestore on all targets.

func (*Wrangler) Validate 

func (wr *Wrangler) Validate(pingTablets bool) error

Validate a whole TopologyServer tree

func (*Wrangler) ValidateKeyspace 

func (wr *Wrangler) ValidateKeyspace(keyspace string, pingTablets bool) error

func (*Wrangler) ValidatePermissionsKeyspace 

func (wr *Wrangler) ValidatePermissionsKeyspace(keyspace string) error

func (*Wrangler) ValidatePermissionsShard 

func (wr *Wrangler) ValidatePermissionsShard(keyspace, shard string) error

func (*Wrangler) ValidateSchemaKeyspace 

func (wr *Wrangler) ValidateSchemaKeyspace(keyspace string, excludeTables []string, includeViews bool) error

ValidateSchemaShard will diff the schema from all the tablets in the keyspace.

func (*Wrangler) ValidateSchemaShard 

func (wr *Wrangler) ValidateSchemaShard(keyspace, shard string, excludeTables []string, includeViews bool) error

ValidateSchemaShard will diff the schema from all the tablets in the shard.

func (*Wrangler) ValidateShard 

func (wr *Wrangler) ValidateShard(keyspace, shard string, pingTablets bool) error

func (*Wrangler) ValidateVersionKeyspace 

func (wr *Wrangler) ValidateVersionKeyspace(keyspace string) error

func (*Wrangler) ValidateVersionShard 

func (wr *Wrangler) ValidateVersionShard(keyspace, shard string) error

Source Files

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Directories

Path Synopsis
Package testlib contains utility methods to include in unit tests to deal with topology common tasks, liek fake tablets and action loops.
 Package testlib contains utility methods to include in unit tests to deal with topology common tasks, liek fake tablets and action loops.

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