Documentation ¶
Index ¶
Constants ¶
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const ( DefaultMaxFileSize = 2 * 1024 * 1024 DefaultBlockSize = 4096 DefaultBlockRestartInterval = 16 DefaultBlockCompressionRatio = 8.0 / 7.0 DefaultWriteBufferSize = 4 * 1024 * 1024 DefaultCompression = compress.SnappyCompression DefaultMaxOpenFiles = 1000 DefaultBlockCacheCapacity = 8 * 1024 * 1024 DefaultCompactionConcurrency = 1 // DefaultCompactionBytesPerSeek gives a default value for // CompactionBytesPerSeek option based on following assumptions: // (1) One seek costs 10ms // (2) Writing or reading 1MB costs 10ms (100MB/s) // (3) A compaction of 1MB does 25MB of IO: // 1MB read from this level // 10-12MB read from next level (boundaries may be misaligned) // 10-12MB written to next level // This implies that 25 seeks cost the same as the compaction // of 1MB of data. I.e., one seek costs approximately the // same as the compaction of 40KB of data. We are a little // conservative and allow approximately one seek for every 16KB // of data before triggering a compaction. -- LevelDB (C++) DefaultCompactionBytesPerSeek = 16 * 1024 DefaultMinimalAllowedOverlapSeeks = 100 DefaultIterationBytesPerSampleSeek = 1024 * 1024 DefaultLevel0ThrottleStepFiles = 4 DefaultLevel0CompactionFiles = 4 DefaultLevel0SlowdownWriteFiles = DefaultLevel0CompactionFiles + DefaultLevel0ThrottleStepFiles DefaultLevel0StopWriteFiles = DefaultLevel0SlowdownWriteFiles + DefaultLevel0ThrottleStepFiles )
Variables ¶
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var DefaultInternalComparator keys.InternalComparator = keys.InternalComparator{UserKeyComparator: keys.BytewiseComparator}
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var DefaultOptions = Options{ Comparator: &DefaultInternalComparator, Compression: compress.SnappyCompression, FileSystem: file.DefaultFileSystem, MaxFileSize: DefaultMaxFileSize, MaxGrandparentOverlapBytes: MaxGrandparentOverlapBytes(DefaultMaxFileSize), MaxExpandedCompactionBytes: MaxExpandedCompactionBytes(DefaultMaxFileSize), BlockSize: DefaultBlockSize, BlockRestartInterval: DefaultBlockRestartInterval, BlockCompressionRatio: DefaultBlockCompressionRatio, WriteBufferSize: DefaultWriteBufferSize, MaxOpenFiles: DefaultMaxOpenFiles, BlockCacheCapacity: DefaultBlockCacheCapacity, CompactionConcurrency: DefaultCompactionConcurrency, CompactionBytesPerSeek: DefaultCompactionBytesPerSeek, MinimalAllowedOverlapSeeks: DefaultMinimalAllowedOverlapSeeks, IterationBytesPerSampleSeek: DefaultIterationBytesPerSampleSeek, Level0CompactionFiles: DefaultLevel0CompactionFiles, Level0SlowdownWriteFiles: DefaultLevel0SlowdownWriteFiles, Level0StopWriteFiles: DefaultLevel0StopWriteFiles, }
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var DefaultReadOptions = ReadOptions{}
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var DefaultWriteOptions = WriteOptions{}
Functions ¶
Types ¶
type Options ¶
type Options struct { Comparator *keys.InternalComparator Compression compress.Type Filter filter.Filter Logger logger.LogCloser FileSystem file.FileSystem MaxFileSize int64 MaxGrandparentOverlapBytes int64 MaxExpandedCompactionBytes int64 BlockSize int BlockRestartInterval int BlockCompressionRatio float64 WriteBufferSize int MaxOpenFiles int BlockCacheCapacity int CompactionConcurrency int CompactionBytesPerSeek int MinimalAllowedOverlapSeeks int IterationBytesPerSampleSeek int Level0CompactionFiles int Level0SlowdownWriteFiles int Level0StopWriteFiles int CreateIfMissing bool ErrorIfExists bool }
type ReadOptions ¶
type WriteOptions ¶
type WriteOptions struct {
Sync bool
}
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