schema

Documentation

Index

• Constants
• type IndexBloomFilterInfo
• type IndexEntry
• type IndexInfo
• type IndexSummariesInfo
• type IndexSummary
• type LogEntry
• type LogInfo
• type LogMetadata

Constants

const MajorVersion = 1

MajorVersion is the major schema version for a set of fileset files, this is only incremented when breaking changes are introduced and tooling needs to upgrade older files to newer files before a server restart

const MinorVersion = 0

MinorVersion is the minor schema version for a set of fileset files. This is only incremented when *non-breaking* changes are introduced that we want to have some level of control around how they're rolled out.

Types

type IndexBloomFilterInfo

type IndexBloomFilterInfo struct {
	NumElementsM int64
	NumHashesK   int64
}

IndexBloomFilterInfo stores metadata about the bloom filter

type IndexEntry

type IndexEntry struct {
	Index        int64
	ID           []byte
	Size         int64
	Offset       int64
	DataChecksum int64
	EncodedTags  []byte
}

IndexEntry stores entry-level data indexing

When serialized to disk, the encoder will automatically add the IndexEntryChecksum, a checksum to validate the index entry itself, to the end of the entry. That field is not exposed on this struct as this is handled transparently by the encoder and decoder. Appending of checksum starts in V3.

type IndexInfo

type IndexInfo struct {
	MajorVersion int64
	BlockStart   int64
	BlockSize    int64
	Entries      int64
	Summaries    IndexSummariesInfo
	BloomFilter  IndexBloomFilterInfo
	SnapshotTime int64
	FileType     persist.FileSetType
	SnapshotID   []byte
	VolumeIndex  int
	MinorVersion int64
}

IndexInfo stores metadata information about block filesets

type IndexSummariesInfo

type IndexSummariesInfo struct {
	Summaries int64
}

IndexSummariesInfo stores metadata about the summaries

type IndexSummary

type IndexSummary struct {
	Index            int64
	ID               []byte
	IndexEntryOffset int64
}

IndexSummary stores a summary of an index entry to lookup

type LogEntry

type LogEntry struct {
	Index      uint64
	Create     int64
	Metadata   []byte
	Timestamp  int64
	Value      float64
	Unit       uint32
	Annotation []byte
}

LogEntry stores per-entry data in a commit log

type LogInfo

type LogInfo struct {
	// Deprecated fields, left intact as documentation for the actual
	// format on disk.
	DeprecatedDoNotUseStart    int64
	DeprecatedDoNotUseDuration int64

	Index int64
}

LogInfo stores summary information about a commit log

type LogMetadata

type LogMetadata struct {
	ID          []byte
	Namespace   []byte
	Shard       uint32
	EncodedTags []byte
}

LogMetadata stores metadata information about a commit log