tsi1

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 Go to latest Published: Jun 21, 2017 License: MIT Imports: 29 Imported by: 0

Documentation

Overview

Package tsi1 provides a memory-mapped index implementation that supports high cardinality series.

Overview

The top-level object in tsi1 is the Index. It is the primary access point from the rest of the system. The Index is composed of LogFile and IndexFile objects.

Log files are small write-ahead log files that record new series immediately in the order that they are received. The data within the file is indexed in-memory so it can be quickly accessed. When the system is restarted, this log file is replayed and the in-memory representation is rebuilt.

Index files also contain series information, however, they are highly indexed so that reads can be performed quickly. Index files are built through a process called compaction where a log file or multiple index files are merged together.

Operations

The index can perform many tasks related to series, measurement, & tag data. All data is inserted by adding a series to the index. When adding a series, the measurement, tag keys, and tag values are all extracted and indexed separately.

Once a series has been added, it can be removed in several ways. First, the individual series can be removed. Second, it can be removed as part of a bulk operation by deleting the entire measurement.

The query engine needs to be able to look up series in a variety of ways such as by measurement name, by tag value, or by using regular expressions. The index provides an API to iterate over subsets of series and perform set operations such as unions and intersections.

Log File Layout

The write-ahead file that series initially are inserted into simply appends all new operations sequentially. It is simply composed of a series of log entries. An entry contains a flag to specify the operation type, the measurement name, the tag set, and a checksum. 

┏━━━━━━━━━LogEntry━━━━━━━━━┓
┃ ┌──────────────────────┐ ┃
┃ │         Flag         │ ┃
┃ ├──────────────────────┤ ┃
┃ │     Measurement      │ ┃
┃ ├──────────────────────┤ ┃
┃ │      Key/Value       │ ┃
┃ ├──────────────────────┤ ┃
┃ │      Key/Value       │ ┃
┃ ├──────────────────────┤ ┃
┃ │      Key/Value       │ ┃
┃ ├──────────────────────┤ ┃
┃ │       Checksum       │ ┃
┃ └──────────────────────┘ ┃
┗━━━━━━━━━━━━━━━━━━━━━━━━━━┛

When the log file is replayed, if the checksum is incorrect or the entry is incomplete (because of a partially failed write) then the log is truncated.

Index File Layout

The index file is composed of 3 main block types: one series block, one or more tag blocks, and one measurement block. At the end of the index file is a trailer that records metadata such as the offsets to these blocks.

Series Block Layout

The series block stores raw series keys in sorted order. It also provides hash indexes so that series can be looked up quickly. Hash indexes are inserted periodically so that memory size is limited at write time. Once all the series and hash indexes have been written then a list of index entries are written so that hash indexes can be looked up via binary search.

The end of the block contains two HyperLogLog++ sketches which track the estimated number of created series and deleted series. After the sketches is a trailer which contains metadata about the block. 

┏━━━━━━━SeriesBlock━━━━━━━━┓
┃ ┌──────────────────────┐ ┃
┃ │      Series Key      │ ┃
┃ ├──────────────────────┤ ┃
┃ │      Series Key      │ ┃
┃ ├──────────────────────┤ ┃
┃ │      Series Key      │ ┃
┃ ├──────────────────────┤ ┃
┃ │                      │ ┃
┃ │      Hash Index      │ ┃
┃ │                      │ ┃
┃ ├──────────────────────┤ ┃
┃ │      Series Key      │ ┃
┃ ├──────────────────────┤ ┃
┃ │      Series Key      │ ┃
┃ ├──────────────────────┤ ┃
┃ │      Series Key      │ ┃
┃ ├──────────────────────┤ ┃
┃ │                      │ ┃
┃ │      Hash Index      │ ┃
┃ │                      │ ┃
┃ ├──────────────────────┤ ┃
┃ │    Index Entries     │ ┃
┃ ├──────────────────────┤ ┃
┃ │     HLL Sketches     │ ┃
┃ ├──────────────────────┤ ┃
┃ │       Trailer        │ ┃
┃ └──────────────────────┘ ┃
┗━━━━━━━━━━━━━━━━━━━━━━━━━━┛

Tag Block Layout

After the series block is one or more tag blocks. One of these blocks exists for every measurement in the index file. The block is structured as a sorted list of values for each key and then a sorted list of keys. Each of these lists has their own hash index for fast direct lookups. 

┏━━━━━━━━Tag Block━━━━━━━━━┓
┃ ┌──────────────────────┐ ┃
┃ │        Value         │ ┃
┃ ├──────────────────────┤ ┃
┃ │        Value         │ ┃
┃ ├──────────────────────┤ ┃
┃ │        Value         │ ┃
┃ ├──────────────────────┤ ┃
┃ │                      │ ┃
┃ │      Hash Index      │ ┃
┃ │                      │ ┃
┃ └──────────────────────┘ ┃
┃ ┌──────────────────────┐ ┃
┃ │        Value         │ ┃
┃ ├──────────────────────┤ ┃
┃ │        Value         │ ┃
┃ ├──────────────────────┤ ┃
┃ │                      │ ┃
┃ │      Hash Index      │ ┃
┃ │                      │ ┃
┃ └──────────────────────┘ ┃
┃ ┌──────────────────────┐ ┃
┃ │         Key          │ ┃
┃ ├──────────────────────┤ ┃
┃ │         Key          │ ┃
┃ ├──────────────────────┤ ┃
┃ │                      │ ┃
┃ │      Hash Index      │ ┃
┃ │                      │ ┃
┃ └──────────────────────┘ ┃
┃ ┌──────────────────────┐ ┃
┃ │       Trailer        │ ┃
┃ └──────────────────────┘ ┃
┗━━━━━━━━━━━━━━━━━━━━━━━━━━┛

Each entry for values contains a sorted list of offsets for series keys that use that value. Series iterators can be built around a single tag key value or multiple iterators can be merged with set operators such as union or intersection.

Measurement block

The measurement block stores a sorted list of measurements, their associated series offsets, and the offset to their tag block. This allows all series for a measurement to be traversed quickly and it allows fast direct lookups of measurements and their tags.

This block also contains HyperLogLog++ sketches for new and deleted measurements. 

┏━━━━Measurement Block━━━━━┓
┃ ┌──────────────────────┐ ┃
┃ │     Measurement      │ ┃
┃ ├──────────────────────┤ ┃
┃ │     Measurement      │ ┃
┃ ├──────────────────────┤ ┃
┃ │     Measurement      │ ┃
┃ ├──────────────────────┤ ┃
┃ │                      │ ┃
┃ │      Hash Index      │ ┃
┃ │                      │ ┃
┃ ├──────────────────────┤ ┃
┃ │     HLL Sketches     │ ┃
┃ ├──────────────────────┤ ┃
┃ │       Trailer        │ ┃
┃ └──────────────────────┘ ┃
┗━━━━━━━━━━━━━━━━━━━━━━━━━━┛

Manifest file

The index is simply an ordered set of log and index files. These files can be merged together or rewritten but their order must always be the same. This is because series, measurements, & tags can be marked as deleted (aka tombstoned) and this action needs to be tracked in time order.

Whenever the set of active files is changed, a manifest file is written to track the set. The manifest specifies the ordering of files and, on startup, all files not in the manifest are removed from the index directory.

Compacting index files

Compaction is the process of taking files and merging them together into a single file. There are two stages of compaction within TSI.

First, once log files exceed a size threshold then they are compacted into an index file. This threshold is relatively small because log files must maintain their index in the heap which TSI tries to avoid. Small log files are also very quick to convert into an index file so this is done aggressively.

Second, once a contiguous set of index files exceed a factor (e.g. 10x) then they are all merged together into a single index file and the old files are discarded. Because all blocks are written in sorted order, the new index file can be streamed and minimize memory use.

Concurrency

Index files are immutable so they do not require fine grained locks, however, compactions require that we track which files are in use so they are not discarded too soon. This is done by using reference counting with file sets.

A file set is simply an ordered list of index files. When the current file set is obtained from the index, a counter is incremented to track its usage. Once the user is done with the file set, it is released and the counter is decremented. A file cannot be removed from the file system until this counter returns to zero.

Besides the reference counting, there are no other locking mechanisms when reading or writing index files. Log files, however, do require a lock whenever they are accessed. This is another reason to minimize log file size.

Index

Constants

View Source 
const (
	LogFileExt   = ".tsl"
	IndexFileExt = ".tsi"

	CompactingExt = ".compacting"
)

File extensions.

View Source 
const (
	// IndexFile trailer fields
	IndexFileVersionSize       = 2
	SeriesBlockOffsetSize      = 8
	SeriesBlockSizeSize        = 8
	MeasurementBlockOffsetSize = 8
	MeasurementBlockSizeSize   = 8

	IndexFileTrailerSize = IndexFileVersionSize +
		SeriesBlockOffsetSize +
		SeriesBlockSizeSize +
		MeasurementBlockOffsetSize +
		MeasurementBlockSizeSize
)

IndexFile field size constants.

View Source 
const (
	LogEntrySeriesTombstoneFlag      = 0x01
	LogEntryMeasurementTombstoneFlag = 0x02
	LogEntryTagKeyTombstoneFlag      = 0x04
	LogEntryTagValueTombstoneFlag    = 0x08
)

Log entry flag constants.

View Source 
const (
	// 1 byte offset for the block to ensure non-zero offsets.
	MeasurementFillSize = 1

	// Measurement trailer fields
	MeasurementTrailerSize = 0 +
		2 +
		8 + 8 +
		8 + 8 +
		8 + 8 +
		8 + 8 // tombstone measurement sketch offset/size

	// Measurement key block fields.
	MeasurementNSize      = 8
	MeasurementOffsetSize = 8
)

Measurement field size constants.

View Source 
const (
	// Series list trailer field sizes.
	SeriesBlockTrailerSize = 0 +
		4 + 4 +
		4 + 4 + 4 +
		8 + 4 + 4 +
		4 + 4 +
		4 + 4 +
		4 + 4 +
		0

	// Other field sizes
	SeriesCountSize = 4
	SeriesIDSize    = 4
)

Series list field size constants.

View Source 
const (
	// Marks the series as having been deleted.
	SeriesTombstoneFlag = 0x01

	// Marks the following bytes as a hash index.
	// These bytes should be skipped by an iterator.
	SeriesHashIndexFlag = 0x02
)

Series flag constants.

View Source 
const (
	// TagBlock key block fields.
	TagKeyNSize      = 8
	TagKeyOffsetSize = 8

	// TagBlock value block fields.
	TagValueNSize      = 8
	TagValueOffsetSize = 8
)

TagBlock variable size constants.

View Source 
const (
	DefaultMaxLogFileSize = 5 * 1024 * 1024
)

Default compaction thresholds.

View Source 
const FileSignature = "TSI1"

FileSignature represents a magic number at the header of the index file.

View Source 
const IndexFileVersion = 1

IndexFileVersion is the current TSI1 index file version.

View Source 
const IndexName = "tsi1"

IndexName is the name of the index.

View Source 
const LoadFactor = 80

LoadFactor is the fill percent for RHH indexes.

View Source 
const ManifestFileName = "MANIFEST"

ManifestFileName is the name of the index manifest file.

View Source 
const MaxIndexFileSize = 4 * (1 << 30)

MaxIndexFileSize is the maximum expected size of an index file.

View Source 
const MaxIndexMergeCount = 2

MaxIndexMergeCount is the maximum number of files that can be merged together at once.

View Source 
const MaxSeriesBlockHashSize = (65536 * LoadFactor) / 100

MaxSeriesBlockHashSize is the maximum number of series in a single hash.

View Source 
const MeasurementBlockVersion = 1

MeasurementBlockVersion is the version of the measurement block.

View Source 
const (
	MeasurementTombstoneFlag = 0x01
)

Measurement flag constants.

View Source 
const TagBlockTrailerSize = 0 +
	8 + 8 +
	8 + 8 +
	8 + 8 +
	8 +

	2 // version

TagBlockTrailerSize is the total size of the on-disk trailer.

View Source 
const TagBlockVersion = 1

TagBlockVersion is the version of the tag block.

View Source 
const (
	TagKeyTombstoneFlag = 0x01
)

Tag key flag constants.

View Source 
const (
	TagValueTombstoneFlag = 0x01
)

Tag value flag constants.

Variables

View Source 
var (
	ErrInvalidIndexFile            = errors.New("invalid index file")
	ErrUnsupportedIndexFileVersion = errors.New("unsupported index file version")
)

IndexFile errors.

View Source 
var (
	ErrUnsupportedMeasurementBlockVersion = errors.New("unsupported measurement block version")
	ErrMeasurementBlockSizeMismatch       = errors.New("measurement block size mismatch")
)

Measurement errors.

View Source 
var (
	ErrUnsupportedTagBlockVersion = errors.New("unsupported tag block version")
	ErrTagBlockSizeMismatch       = errors.New("tag block size mismatch")
)

TagBlock errors.

View Source 
var DefaultCompactionLevels = []CompactionLevel{
	{M: 0, K: 0},
	{M: 1 << 25, K: 6},
	{M: 1 << 25, K: 6},
	{M: 1 << 26, K: 6},
	{M: 1 << 27, K: 6},
	{M: 1 << 28, K: 6},
	{M: 1 << 29, K: 6},
	{M: 1 << 30, K: 6},
}

DefaultCompactionLevels is the default settings used by the index.

View Source 
var (
	ErrLogEntryChecksumMismatch = errors.New("log entry checksum mismatch")
)

Log errors.

View Source 
var ErrSeriesOverflow = errors.New("series overflow")

ErrSeriesOverflow is returned when too many series are added to a series writer.

Functions

func AppendSeriesElem 

func AppendSeriesElem(dst []byte, flag byte, name []byte, tags models.Tags) []byte

AppendSeriesElem serializes flag/name/tags to dst and returns the new buffer.

func AppendSeriesKey 

func AppendSeriesKey(dst []byte, name []byte, tags models.Tags) []byte

AppendSeriesKey serializes name and tags to a byte slice. The total length is prepended as a uvarint.

func CompareSeriesElem 

func CompareSeriesElem(a, b SeriesElem) int

CompareSeriesElem returns -1 if a < b, 1 if a > b, and 0 if equal.

func CompareSeriesKeys 

func CompareSeriesKeys(a, b []byte) int

func FormatIndexFileName 

func FormatIndexFileName(id, level int) string

FormatIndexFileName generates an index filename for the given index.

func FormatLogFileName 

func FormatLogFileName(id int) string

FormatLogFileName generates a log filename for the given index.

func ParseFilename 

func ParseFilename(name string) (level, id int)

ParseFilename extracts the numeric id from a log or index file path. Returns 0 if it cannot be parsed.

func ReadSeriesKey 

func ReadSeriesKey(data []byte) []byte

ReadSeriesKey returns the series key from the beginning of the buffer.

func SeriesElemKey 

func SeriesElemKey(e SeriesElem) []byte

SeriesElemKey encodes e as a series key.

func WriteManifestFile 

func WriteManifestFile(path string, m *Manifest) error

WriteManifestFile writes a manifest to a file path.

Types

type CompactionLevel 

type CompactionLevel struct {
	// Bloom filter bit size & hash count
	M uint64 `json:"m,omitempty"`
	K uint64 `json:"k,omitempty"`
}

CompactionLevel represents a grouping of index files based on bloom filter settings. By having the same bloom filter settings, the filters can be merged and evaluated at a higher level.

type File 

type File interface {
	Close() error
	Path() string

	ID() int
	Level() int

	Measurement(name []byte) MeasurementElem
	MeasurementIterator() MeasurementIterator
	HasSeries(name []byte, tags models.Tags, buf []byte) (exists, tombstoned bool)
	Series(name []byte, tags models.Tags) SeriesElem
	SeriesN() uint64

	TagKey(name, key []byte) TagKeyElem
	TagKeyIterator(name []byte) TagKeyIterator

	TagValue(name, key, value []byte) TagValueElem
	TagValueIterator(name, key []byte) TagValueIterator

	// Series iteration.
	SeriesIterator() SeriesIterator
	MeasurementSeriesIterator(name []byte) SeriesIterator
	TagKeySeriesIterator(name, key []byte) SeriesIterator
	TagValueSeriesIterator(name, key, value []byte) SeriesIterator

	// Sketches for cardinality estimation
	MergeSeriesSketches(s, t estimator.Sketch) error
	MergeMeasurementsSketches(s, t estimator.Sketch) error

	// Series existence bloom filter.
	Filter() *bloom.Filter

	// Reference counting.
	Retain()
	Release()
}

File represents a log or index file.

type FileSet 

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

FileSet represents a collection of files.

func NewFileSet 

func NewFileSet(levels []CompactionLevel, files []File) (*FileSet, error)

NewFileSet returns a new instance of FileSet.

func (FileSet) Close 

func (p FileSet) Close() error

Close closes all the files in the file set.

func (*FileSet) Files 

func (fs *FileSet) Files() []File

Files returns all files in the set.

func (*FileSet) FilterNamesTags 

func (fs *FileSet) FilterNamesTags(names [][]byte, tagsSlice []models.Tags) ([][]byte, []models.Tags)

FilterNamesTags filters out any series which already exist. It modifies the provided slices of names and tags.

func (*FileSet) HasSeries 

func (fs *FileSet) HasSeries(name []byte, tags models.Tags, buf []byte) bool

HasSeries returns true if the series exists and is not tombstoned.

func (*FileSet) HasTagKey 

func (fs *FileSet) HasTagKey(name, key []byte) bool

HasTagKey returns true if the tag key exists.

func (*FileSet) HasTagValue 

func (fs *FileSet) HasTagValue(name, key, value []byte) bool

HasTagValue returns true if the tag value exists.

func (*FileSet) IndexFiles 

func (fs *FileSet) IndexFiles() []*IndexFile

IndexFiles returns all index files from the file set.

func (*FileSet) LastContiguousIndexFilesByLevel 

func (fs *FileSet) LastContiguousIndexFilesByLevel(level int) []*IndexFile

LastContiguousIndexFilesByLevel returns the last contiguous files by level. These can be used by the compaction scheduler.

func (*FileSet) LogFiles 

func (fs *FileSet) LogFiles() []*LogFile

LogFiles returns all log files from the file set.

func (*FileSet) MatchTagValueSeriesIterator 

func (fs *FileSet) MatchTagValueSeriesIterator(name, key []byte, value *regexp.Regexp, matches bool) SeriesIterator

MatchTagValueSeriesIterator returns a series iterator for tags which match value. If matches is false, returns iterators which do not match value.

func (*FileSet) MaxID 

func (fs *FileSet) MaxID() int

MaxID returns the highest file identifier.

func (*FileSet) Measurement 

func (fs *FileSet) Measurement(name []byte) MeasurementElem

Measurement returns a measurement by name.

func (*FileSet) MeasurementIterator 

func (fs *FileSet) MeasurementIterator() MeasurementIterator

MeasurementIterator returns an iterator over all measurements in the index.

func (*FileSet) MeasurementNamesByExpr 

func (fs *FileSet) MeasurementNamesByExpr(expr influxql.Expr) ([][]byte, error)

func (*FileSet) MeasurementSeriesByExprIterator 

func (fs *FileSet) MeasurementSeriesByExprIterator(name []byte, expr influxql.Expr, fieldset *tsdb.MeasurementFieldSet) (SeriesIterator, error)

MeasurementSeriesByExprIterator returns a series iterator for a measurement that is filtered by expr. If expr only contains time expressions then this call is equivalent to MeasurementSeriesIterator().

func (*FileSet) MeasurementSeriesIterator 

func (fs *FileSet) MeasurementSeriesIterator(name []byte) SeriesIterator

MeasurementSeriesIterator returns an iterator over all non-tombstoned series in the index for the provided measurement.

func (*FileSet) MeasurementSeriesKeysByExpr 

func (fs *FileSet) MeasurementSeriesKeysByExpr(name []byte, expr influxql.Expr, fieldset *tsdb.MeasurementFieldSet) ([][]byte, error)

MeasurementSeriesKeysByExpr returns a list of series keys matching expr.

func (*FileSet) MeasurementTagKeysByExpr 

func (fs *FileSet) MeasurementTagKeysByExpr(name []byte, expr influxql.Expr) (map[string]struct{}, error)

MeasurementTagKeysByExpr extracts the tag keys wanted by the expression.

func (*FileSet) MeasurementsSketches 

func (fs *FileSet) MeasurementsSketches() (estimator.Sketch, estimator.Sketch, error)

MeasurementsSketches returns the merged measurement sketches for the FileSet.

func (*FileSet) MustReplace 

func (fs *FileSet) MustReplace(oldFiles []File, newFile File) *FileSet

MustReplace swaps a list of files for a single file and returns a new file set. The caller should always guarentee that the files exist and are contiguous.

func (*FileSet) Prepend 

func (fs *FileSet) Prepend(f File) (*FileSet, error)

Prepend returns a new file set with f added at the beginning.

func (*FileSet) Release 

func (fs *FileSet) Release()

Release removes a reference count from all files.

func (*FileSet) Retain 

func (fs *FileSet) Retain()

Retain adds a reference count to all files.

func (*FileSet) SeriesIterator 

func (fs *FileSet) SeriesIterator() SeriesIterator

SeriesIterator returns an iterator over all series in the index.

func (*FileSet) SeriesSketches 

func (fs *FileSet) SeriesSketches() (estimator.Sketch, estimator.Sketch, error)

SeriesSketches returns the merged series sketches for the FileSet.

func (*FileSet) TagKeyIterator 

func (fs *FileSet) TagKeyIterator(name []byte) TagKeyIterator

TagKeyIterator returns an iterator over all tag keys for a measurement.

func (*FileSet) TagKeySeriesIterator 

func (fs *FileSet) TagKeySeriesIterator(name, key []byte) SeriesIterator

TagKeySeriesIterator returns a series iterator for all values across a single key.

func (*FileSet) TagValueIterator 

func (fs *FileSet) TagValueIterator(name, key []byte) TagValueIterator

TagValueIterator returns a value iterator for a tag key.

func (*FileSet) TagValueSeriesIterator 

func (fs *FileSet) TagValueSeriesIterator(name, key, value []byte) SeriesIterator

TagValueSeriesIterator returns a series iterator for a single tag value.

type Files 

type Files []File

func (Files) IDs 

func (a Files) IDs() []int

type Index 

type Index struct {

	// Associated shard info.
	ShardID uint64

	// Name of database.
	Database string

	// Root directory of the index files.
	Path string

	// Log file compaction thresholds.
	MaxLogFileSize int64

	// Frequency of compaction checks.
	CompactionEnabled         bool
	CompactionMonitorInterval time.Duration
	// contains filtered or unexported fields
}

Index represents a collection of layered index files and WAL.

func NewIndex 

func NewIndex() *Index

NewIndex returns a new instance of Index.

func (*Index) AssignShard 

func (i *Index) AssignShard(k string, shardID uint64)

func (*Index) CheckLogFile 

func (i *Index) CheckLogFile() error

func (*Index) Close 

func (i *Index) Close() error

Close closes the index.

func (*Index) Compact 

func (i *Index) Compact()

Compact requests a compaction of log files.

func (*Index) CreateSeriesIfNotExists 

func (i *Index) CreateSeriesIfNotExists(key, name []byte, tags models.Tags) error

CreateSeriesIfNotExists creates a series if it doesn't exist or is deleted.

func (*Index) CreateSeriesListIfNotExists 

func (i *Index) CreateSeriesListIfNotExists(_, names [][]byte, tagsSlice []models.Tags) error

CreateSeriesListIfNotExists creates a list of series if they doesn't exist in bulk.

func (*Index) DropMeasurement 

func (i *Index) DropMeasurement(name []byte) error

DropMeasurement deletes a measurement from the index.

func (*Index) DropSeries 

func (i *Index) DropSeries(key []byte) error

func (*Index) FileN 

func (i *Index) FileN() int

FileN returns the active files in the file set.

func (*Index) ForEachMeasurementName 

func (i *Index) ForEachMeasurementName(fn func(name []byte) error) error

ForEachMeasurementName iterates over all measurement names in the index.

func (*Index) ForEachMeasurementSeriesByExpr 

func (i *Index) ForEachMeasurementSeriesByExpr(name []byte, condition influxql.Expr, fn func(tags models.Tags) error) error

ForEachMeasurementSeriesByExpr iterates over all series in a measurement filtered by an expression.

func (*Index) ForEachMeasurementTagKey 

func (i *Index) ForEachMeasurementTagKey(name []byte, fn func(key []byte) error) error

ForEachMeasurementTagKey iterates over all tag keys in a measurement.

func (*Index) HasTagKey 

func (i *Index) HasTagKey(name, key []byte) (bool, error)

HasTagKey returns true if tag key exists.

func (*Index) InitializeSeries 

func (i *Index) InitializeSeries(key, name []byte, tags models.Tags) error

InitializeSeries is a no-op. This only applies to the in-memory index.

func (*Index) Manifest 

func (i *Index) Manifest() *Manifest

Manifest returns a manifest for the index.

func (*Index) ManifestPath 

func (i *Index) ManifestPath() string

ManifestPath returns the path to the index's manifest file.

func (*Index) MeasurementExists 

func (i *Index) MeasurementExists(name []byte) (bool, error)

MeasurementExists returns true if a measurement exists.

func (*Index) MeasurementNamesByExpr 

func (i *Index) MeasurementNamesByExpr(expr influxql.Expr) ([][]byte, error)

func (*Index) MeasurementNamesByRegex 

func (i *Index) MeasurementNamesByRegex(re *regexp.Regexp) ([][]byte, error)

func (*Index) MeasurementSeriesKeysByExpr 

func (i *Index) MeasurementSeriesKeysByExpr(name []byte, expr influxql.Expr) ([][]byte, error)

MeasurementSeriesKeysByExpr returns a list of series keys matching expr.

func (*Index) MeasurementTagKeysByExpr 

func (i *Index) MeasurementTagKeysByExpr(name []byte, expr influxql.Expr) (map[string]struct{}, error)

MeasurementTagKeysByExpr extracts the tag keys wanted by the expression.

func (*Index) MeasurementsSketches 

func (i *Index) MeasurementsSketches() (estimator.Sketch, estimator.Sketch, error)

MeasurementsSketches returns the two sketches for the index by merging all instances of the type sketch types in all the index files.

func (*Index) NextSequence 

func (i *Index) NextSequence() int

NextSequence returns the next file identifier.

func (*Index) Open 

func (i *Index) Open() error

Open opens the index.

func (*Index) RemoveShard 

func (i *Index) RemoveShard(shardID uint64)

func (*Index) RetainFileSet 

func (i *Index) RetainFileSet() *FileSet

RetainFileSet returns the current fileset and adds a reference count.

func (*Index) SeriesN 

func (i *Index) SeriesN() int64

SeriesN returns the number of unique non-tombstoned series in the index. Since indexes are not shared across shards, the count returned by SeriesN cannot be combined with other shard's results. If you need to count series across indexes then use SeriesSketches and merge the results from other indexes.

func (*Index) SeriesPointIterator 

func (i *Index) SeriesPointIterator(opt influxql.IteratorOptions) (influxql.Iterator, error)

SeriesPointIterator returns an influxql iterator over all series.

func (*Index) SeriesSketches 

func (i *Index) SeriesSketches() (estimator.Sketch, estimator.Sketch, error)

SeriesSketches returns the two sketches for the index by merging all instances sketches from TSI files and the WAL.

func (*Index) SetFieldName 

func (i *Index) SetFieldName(measurement []byte, name string)

func (*Index) SetFieldSet 

func (i *Index) SetFieldSet(fs *tsdb.MeasurementFieldSet)

SetFieldSet sets a shared field set from the engine.

func (*Index) SnapshotTo 

func (i *Index) SnapshotTo(path string) error

SnapshotTo creates hard links to the file set into path.

func (*Index) TagKeyCardinality 

func (i *Index) TagKeyCardinality(name, key []byte) int

TagKeyCardinality always returns zero. It is not possible to determine cardinality of tags across index files.

func (*Index) TagSets 

func (i *Index) TagSets(name []byte, opt influxql.IteratorOptions) ([]*influxql.TagSet, error)

TagSets returns an ordered list of tag sets for a measurement by dimension and filtered by an optional conditional expression.

func (*Index) Type 

func (i *Index) Type() string

func (*Index) UnassignShard 

func (i *Index) UnassignShard(k string, shardID uint64) error

func (*Index) WithLogger 

func (i *Index) WithLogger(logger zap.Logger)

WithLogger sets the logger for the index.

type IndexFile 

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

IndexFile represents a collection of measurement, tag, and series data.

func NewIndexFile 

func NewIndexFile() *IndexFile

NewIndexFile returns a new instance of IndexFile.

func (*IndexFile) Close 

func (f *IndexFile) Close() error

Close unmaps the data file.

func (*IndexFile) Compacting 

func (f *IndexFile) Compacting() bool

Compacting returns true if the file is being compacted.

func (*IndexFile) Filter 

func (f *IndexFile) Filter() *bloom.Filter

Filter returns the series existence filter for the file.

func (*IndexFile) HasSeries 

func (f *IndexFile) HasSeries(name []byte, tags models.Tags, buf []byte) (exists, tombstoned bool)

HasSeries returns flags indicating if the series exists and if it is tombstoned.

func (*IndexFile) ID 

func (f *IndexFile) ID() int

ID returns the file sequence identifier.

func (*IndexFile) Level 

func (f *IndexFile) Level() int

Level returns the compaction level for the file.

func (*IndexFile) Measurement 

func (f *IndexFile) Measurement(name []byte) MeasurementElem

Measurement returns a measurement element.

func (*IndexFile) MeasurementIterator 

func (f *IndexFile) MeasurementIterator() MeasurementIterator

MeasurementIterator returns an iterator over all measurements.

func (*IndexFile) MeasurementN 

func (f *IndexFile) MeasurementN() (n uint64)

MeasurementN returns the number of measurements in the file.

func (*IndexFile) MeasurementSeriesIterator 

func (f *IndexFile) MeasurementSeriesIterator(name []byte) SeriesIterator

MeasurementSeriesIterator returns an iterator over a measurement's series.

func (*IndexFile) MergeMeasurementsSketches 

func (f *IndexFile) MergeMeasurementsSketches(s, t estimator.Sketch) error

MergeMeasurementsSketches merges the index file's series sketches into the provided sketches.

func (*IndexFile) MergeSeriesSketches 

func (f *IndexFile) MergeSeriesSketches(s, t estimator.Sketch) error

MergeSeriesSketches merges the index file's series sketches into the provided sketches.

func (*IndexFile) Open 

func (f *IndexFile) Open() error

Open memory maps the data file at the file's path.

func (*IndexFile) Path 

func (f *IndexFile) Path() string

Path returns the file path.

func (*IndexFile) Release 

func (f *IndexFile) Release()

Release removes a reference count from the file.

func (*IndexFile) Retain 

func (f *IndexFile) Retain()

Retain adds a reference count to the file.

func (*IndexFile) Series 

func (f *IndexFile) Series(name []byte, tags models.Tags) SeriesElem

Series returns the series and a flag indicating if the series has been tombstoned by the measurement.

func (*IndexFile) SeriesIterator 

func (f *IndexFile) SeriesIterator() SeriesIterator

SeriesIterator returns an iterator over all series.

func (*IndexFile) SeriesN 

func (f *IndexFile) SeriesN() uint64

SeriesN returns the total number of non-tombstoned series for the index file.

func (*IndexFile) SetPath 

func (f *IndexFile) SetPath(path string)

SetPath sets the file's path.

func (*IndexFile) Size 

func (f *IndexFile) Size() int64

Size returns the size of the index file, in bytes.

func (*IndexFile) TagKey 

func (f *IndexFile) TagKey(name, key []byte) TagKeyElem

TagKey returns a tag key.

func (*IndexFile) TagKeyIterator 

func (f *IndexFile) TagKeyIterator(name []byte) TagKeyIterator

TagKeyIterator returns an iterator over all tag keys for a measurement.

func (*IndexFile) TagKeySeriesIterator 

func (f *IndexFile) TagKeySeriesIterator(name, key []byte) SeriesIterator

TagKeySeriesIterator returns a series iterator for a tag key and a flag indicating if a tombstone exists on the measurement or key.

func (*IndexFile) TagValue 

func (f *IndexFile) TagValue(name, key, value []byte) TagValueElem

TagValue returns a tag value.

func (*IndexFile) TagValueElem 

func (f *IndexFile) TagValueElem(name, key, value []byte) TagValueElem

TagValueElem returns an element for a measurement/tag/value.

func (*IndexFile) TagValueIterator 

func (f *IndexFile) TagValueIterator(name, key []byte) TagValueIterator

TagValueIterator returns a value iterator for a tag key and a flag indicating if a tombstone exists on the measurement or key.

func (*IndexFile) TagValueSeriesIterator 

func (f *IndexFile) TagValueSeriesIterator(name, key, value []byte) SeriesIterator

TagValueSeriesIterator returns a series iterator for a tag value and a flag indicating if a tombstone exists on the measurement, key, or value.

func (*IndexFile) UnmarshalBinary 

func (f *IndexFile) UnmarshalBinary(data []byte) error

UnmarshalBinary opens an index from data. The byte slice is retained so it must be kept open.

type IndexFileTrailer 

type IndexFileTrailer struct {
	Version     int
	SeriesBlock struct {
		Offset int64
		Size   int64
	}
	MeasurementBlock struct {
		Offset int64
		Size   int64
	}
}

IndexFileTrailer represents meta data written to the end of the index file.

func ReadIndexFileTrailer 

func ReadIndexFileTrailer(data []byte) (IndexFileTrailer, error)

ReadIndexFileTrailer returns the index file trailer from data.

func (*IndexFileTrailer) WriteTo 

func (t *IndexFileTrailer) WriteTo(w io.Writer) (n int64, err error)

WriteTo writes the trailer to w.

type IndexFiles 

type IndexFiles []*IndexFile

IndexFiles represents a layered set of index files.

func (IndexFiles) CompactTo 

func (p IndexFiles) CompactTo(w io.Writer, m, k uint64) (n int64, err error)

CompactTo merges all index files and writes them to w.

func (IndexFiles) Files 

func (p IndexFiles) Files() []File

Files returns p as a list of File objects.

func (IndexFiles) IDs 

func (p IndexFiles) IDs() []int

IDs returns the ids for all index files.

func (IndexFiles) MeasurementIterator 

func (p IndexFiles) MeasurementIterator() MeasurementIterator

MeasurementIterator returns an iterator that merges measurements across all files.

func (*IndexFiles) MeasurementNames 

func (p *IndexFiles) MeasurementNames() [][]byte

MeasurementNames returns a sorted list of all measurement names for all files.

func (IndexFiles) MeasurementSeriesIterator 

func (p IndexFiles) MeasurementSeriesIterator(name []byte) SeriesIterator

MeasurementSeriesIterator returns an iterator that merges series across all files.

func (IndexFiles) Release 

func (p IndexFiles) Release()

Release removes a reference count from all files.

func (IndexFiles) Retain 

func (p IndexFiles) Retain()

Retain adds a reference count to all files.

func (IndexFiles) SeriesIterator 

func (p IndexFiles) SeriesIterator() SeriesIterator

SeriesIterator returns an iterator that merges series across all files.

func (IndexFiles) Stat 

func (p IndexFiles) Stat() (*IndexFilesInfo, error)

Stat returns the max index file size and the total file size for all index files.

func (*IndexFiles) TagKeyIterator 

func (p *IndexFiles) TagKeyIterator(name []byte) (TagKeyIterator, error)

TagKeyIterator returns an iterator that merges tag keys across all files.

func (IndexFiles) TagValueSeriesIterator 

func (p IndexFiles) TagValueSeriesIterator(name, key, value []byte) SeriesIterator

TagValueSeriesIterator returns an iterator that merges series across all files.

type IndexFilesInfo 

type IndexFilesInfo struct {
	MaxSize int64     // largest file size
	Size    int64     // total file size
	ModTime time.Time // last modified
}

type LogEntry 

type LogEntry struct {
	Flag     byte        // flag
	Name     []byte      // measurement name
	Tags     models.Tags // tagset
	Checksum uint32      // checksum of flag/name/tags.
	Size     int         // total size of record, in bytes.
}

LogEntry represents a single log entry in the write-ahead log.

func (*LogEntry) UnmarshalBinary 

func (e *LogEntry) UnmarshalBinary(data []byte) error

UnmarshalBinary unmarshals data into e.

type LogFile 

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

LogFile represents an on-disk write-ahead log file.

func NewLogFile 

func NewLogFile(path string) *LogFile

NewLogFile returns a new instance of LogFile.

func (*LogFile) AddSeries 

func (f *LogFile) AddSeries(name []byte, tags models.Tags) error

AddSeries adds a series to the log file.

func (*LogFile) AddSeriesList 

func (f *LogFile) AddSeriesList(names [][]byte, tagsSlice []models.Tags) error

AddSeriesList adds a list of series to the log file in bulk.

func (*LogFile) Close 

func (f *LogFile) Close() error

Close shuts down the file handle and mmap.

func (*LogFile) CompactTo 

func (f *LogFile) CompactTo(w io.Writer, m, k uint64) (n int64, err error)

CompactTo compacts the log file and writes it to w.

func (*LogFile) DeleteMeasurement 

func (f *LogFile) DeleteMeasurement(name []byte) error

DeleteMeasurement adds a tombstone for a measurement to the log file.

func (*LogFile) DeleteSeries 

func (f *LogFile) DeleteSeries(name []byte, tags models.Tags) error

DeleteSeries adds a tombstone for a series to the log file.

func (*LogFile) DeleteTagKey 

func (f *LogFile) DeleteTagKey(name, key []byte) error

DeleteTagKey adds a tombstone for a tag key to the log file.

func (*LogFile) DeleteTagValue 

func (f *LogFile) DeleteTagValue(name, key, value []byte) error

DeleteTagValue adds a tombstone for a tag value to the log file.

func (*LogFile) Filter 

func (f *LogFile) Filter() *bloom.Filter

Filter returns the bloom filter for the file.

func (*LogFile) FilterNamesTags 

func (f *LogFile) FilterNamesTags(names [][]byte, tagsSlice []models.Tags) ([][]byte, []models.Tags)

FilterNamesTags filters out any series which already exist. It modifies the provided slices of names and tags.

func (*LogFile) Flush 

func (f *LogFile) Flush() error

Flush flushes buffered data to disk.

func (*LogFile) HasSeries 

func (f *LogFile) HasSeries(name []byte, tags models.Tags, buf []byte) (exists, tombstoned bool)

HasSeries returns flags indicating if the series exists and if it is tombstoned.

func (*LogFile) ID 

func (f *LogFile) ID() int

ID returns the file sequence identifier.

func (*LogFile) Level 

func (f *LogFile) Level() int

Level returns the log level of the file.

func (*LogFile) Measurement 

func (f *LogFile) Measurement(name []byte) MeasurementElem

Measurement returns a measurement element.

func (*LogFile) MeasurementIterator 

func (f *LogFile) MeasurementIterator() MeasurementIterator

MeasurementIterator returns an iterator over all the measurements in the file.

func (*LogFile) MeasurementN 

func (f *LogFile) MeasurementN() (n uint64)

MeasurementN returns the total number of measurements.

func (*LogFile) MeasurementNames 

func (f *LogFile) MeasurementNames() []string

MeasurementNames returns an ordered list of measurement names.

func (*LogFile) MeasurementSeriesIterator 

func (f *LogFile) MeasurementSeriesIterator(name []byte) SeriesIterator

MeasurementSeriesIterator returns an iterator over all series for a measurement.

func (*LogFile) MergeMeasurementsSketches 

func (f *LogFile) MergeMeasurementsSketches(sketch, tsketch estimator.Sketch) error

MergeMeasurementsSketches merges the measurement sketches belonging to this LogFile into the provided sketches.

MergeMeasurementsSketches is safe for concurrent use by multiple goroutines.

func (*LogFile) MergeSeriesSketches 

func (f *LogFile) MergeSeriesSketches(sketch, tsketch estimator.Sketch) error

MergeSeriesSketches merges the series sketches belonging to this LogFile into the provided sketches.

MergeSeriesSketches is safe for concurrent use by multiple goroutines.

func (*LogFile) Open 

func (f *LogFile) Open() error

Open reads the log from a file and validates all the checksums.

func (*LogFile) Path 

func (f *LogFile) Path() string

Path returns the file path.

func (*LogFile) Release 

func (f *LogFile) Release()

Release removes a reference count from the file.

func (*LogFile) Retain 

func (f *LogFile) Retain()

Retain adds a reference count to the file.

func (*LogFile) Series 

func (f *LogFile) Series(name []byte, tags models.Tags) SeriesElem

Series returns a series by name/tags.

func (*LogFile) SeriesIterator 

func (f *LogFile) SeriesIterator() SeriesIterator

SeriesIterator returns an iterator over all series in the log file.

func (*LogFile) SeriesN 

func (f *LogFile) SeriesN() (n uint64)

SeriesN returns the total number of series in the file.

func (*LogFile) SeriesWithBuffer 

func (f *LogFile) SeriesWithBuffer(name []byte, tags models.Tags, buf []byte) SeriesElem

SeriesWithBuffer returns a series by name/tags.

func (*LogFile) SetPath 

func (f *LogFile) SetPath(path string)

SetPath sets the log file's path.

func (*LogFile) Size 

func (f *LogFile) Size() int64

Size returns the size of the file, in bytes.

func (*LogFile) Stat 

func (f *LogFile) Stat() (int64, time.Time)

Stat returns size and last modification time of the file.

func (*LogFile) TagKey 

func (f *LogFile) TagKey(name, key []byte) TagKeyElem

TagKey returns a tag key element.

func (*LogFile) TagKeyIterator 

func (f *LogFile) TagKeyIterator(name []byte) TagKeyIterator

TagKeyIterator returns a value iterator for a measurement.

func (*LogFile) TagKeyN 

func (f *LogFile) TagKeyN() (n uint64)

TagKeyN returns the total number of keys.

func (*LogFile) TagKeySeriesIterator 

func (f *LogFile) TagKeySeriesIterator(name, key []byte) SeriesIterator

TagKeySeriesIterator returns a series iterator for a tag key.

func (*LogFile) TagValue 

func (f *LogFile) TagValue(name, key, value []byte) TagValueElem

TagValue returns a tag value element.

func (*LogFile) TagValueIterator 

func (f *LogFile) TagValueIterator(name, key []byte) TagValueIterator

TagValueIterator returns a value iterator for a tag key.

func (*LogFile) TagValueN 

func (f *LogFile) TagValueN() (n uint64)

TagValueN returns the total number of values.

func (*LogFile) TagValueSeriesIterator 

func (f *LogFile) TagValueSeriesIterator(name, key, value []byte) SeriesIterator

TagValueSeriesIterator returns a series iterator for a tag value.

type Manifest 

type Manifest struct {
	Levels []CompactionLevel `json:"levels,omitempty"`
	Files  []string          `json:"files,omitempty"`
}

Manifest represents the list of log & index files that make up the index. The files are listed in time order, not necessarily ID order.

func NewManifest 

func NewManifest() *Manifest

NewManifest returns a new instance of Manifest with default compaction levels.

func ReadManifestFile 

func ReadManifestFile(path string) (*Manifest, error)

ReadManifestFile reads a manifest from a file path.

func (*Manifest) HasFile 

func (m *Manifest) HasFile(name string) bool

HasFile returns true if name is listed in the log files or index files.

type MeasurementBlock 

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

MeasurementBlock represents a collection of all measurements in an index.

func (*MeasurementBlock) Elem 

func (blk *MeasurementBlock) Elem(name []byte) (e MeasurementBlockElem, ok bool)

Elem returns an element for a measurement.

func (*MeasurementBlock) Iterator 

func (blk *MeasurementBlock) Iterator() MeasurementIterator

Iterator returns an iterator over all measurements.

func (*MeasurementBlock) UnmarshalBinary 

func (blk *MeasurementBlock) UnmarshalBinary(data []byte) error

UnmarshalBinary unpacks data into the block. Block is not copied so data should be retained and unchanged after being passed into this function.

func (*MeasurementBlock) Version 

func (blk *MeasurementBlock) Version() int

Version returns the encoding version parsed from the data. Only valid after UnmarshalBinary() has been successfully invoked.

type MeasurementBlockElem 

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

MeasurementBlockElem represents an internal measurement element.

func (*MeasurementBlockElem) Deleted 

func (e *MeasurementBlockElem) Deleted() bool

Deleted returns true if the tombstone flag is set.

func (*MeasurementBlockElem) Name 

func (e *MeasurementBlockElem) Name() []byte

Name returns the measurement name.

func (*MeasurementBlockElem) SeriesData 

func (e *MeasurementBlockElem) SeriesData() []byte

SeriesData returns the raw series data.

func (*MeasurementBlockElem) SeriesID 

func (e *MeasurementBlockElem) SeriesID(i int) uint32

SeriesID returns series ID at an index.

func (*MeasurementBlockElem) SeriesIDs 

func (e *MeasurementBlockElem) SeriesIDs() []uint32

SeriesIDs returns a list of decoded series ids.

NOTE: This should be used for testing and diagnostics purposes only. It requires loading the entire list of series in-memory.

func (*MeasurementBlockElem) SeriesN 

func (e *MeasurementBlockElem) SeriesN() uint32

SeriesN returns the number of series associated with the measurement.

func (*MeasurementBlockElem) Size 

func (e *MeasurementBlockElem) Size() int

Size returns the size of the element.

func (*MeasurementBlockElem) TagBlockOffset 

func (e *MeasurementBlockElem) TagBlockOffset() int64

TagBlockOffset returns the offset of the measurement's tag block.

func (*MeasurementBlockElem) TagBlockSize 

func (e *MeasurementBlockElem) TagBlockSize() int64

TagBlockSize returns the size of the measurement's tag block.

func (*MeasurementBlockElem) UnmarshalBinary 

func (e *MeasurementBlockElem) UnmarshalBinary(data []byte) error

UnmarshalBinary unmarshals data into e.

type MeasurementBlockTrailer 

type MeasurementBlockTrailer struct {
	Version int // Encoding version

	// Offset & size of data section.
	Data struct {
		Offset int64
		Size   int64
	}

	// Offset & size of hash map section.
	HashIndex struct {
		Offset int64
		Size   int64
	}

	// Offset and size of cardinality sketch for measurements.
	Sketch struct {
		Offset int64
		Size   int64
	}

	// Offset and size of cardinality sketch for tombstoned measurements.
	TSketch struct {
		Offset int64
		Size   int64
	}
}

MeasurementBlockTrailer represents meta data at the end of a MeasurementBlock.

func ReadMeasurementBlockTrailer 

func ReadMeasurementBlockTrailer(data []byte) (MeasurementBlockTrailer, error)

ReadMeasurementBlockTrailer returns the block trailer from data.

func (*MeasurementBlockTrailer) WriteTo 

func (t *MeasurementBlockTrailer) WriteTo(w io.Writer) (n int64, err error)

WriteTo writes the trailer to w.

type MeasurementBlockWriter 

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

MeasurementBlockWriter writes a measurement block.

func NewMeasurementBlockWriter 

func NewMeasurementBlockWriter() *MeasurementBlockWriter

NewMeasurementBlockWriter returns a new MeasurementBlockWriter.

func (*MeasurementBlockWriter) Add 

func (mw *MeasurementBlockWriter) Add(name []byte, deleted bool, offset, size int64, seriesIDs []uint32)

Add adds a measurement with series and tag set offset/size.

func (*MeasurementBlockWriter) WriteTo 

func (mw *MeasurementBlockWriter) WriteTo(w io.Writer) (n int64, err error)

WriteTo encodes the measurements to w.

type MeasurementElem 

type MeasurementElem interface {
	Name() []byte
	Deleted() bool
}

MeasurementElem represents a generic measurement element.

type MeasurementElems 

type MeasurementElems []MeasurementElem

MeasurementElems represents a list of MeasurementElem.

func (MeasurementElems) Len 

func (a MeasurementElems) Len() int

func (MeasurementElems) Less 

func (a MeasurementElems) Less(i, j int) bool

func (MeasurementElems) Swap 

func (a MeasurementElems) Swap(i, j int)

type MeasurementIterator 

type MeasurementIterator interface {
	Next() MeasurementElem
}

MeasurementIterator represents a iterator over a list of measurements.

func FilterUndeletedMeasurementIterator 

func FilterUndeletedMeasurementIterator(itr MeasurementIterator) MeasurementIterator

FilterUndeletedMeasurementIterator returns an iterator which filters all deleted measurement.

func MergeMeasurementIterators 

func MergeMeasurementIterators(itrs ...MeasurementIterator) MeasurementIterator

MergeMeasurementIterators returns an iterator that merges a set of iterators. Iterators that are first in the list take precendence and a deletion by those early iterators will invalidate elements by later iterators.

type SeriesBlock 

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

SeriesBlock represents the section of the index that holds series data.

func (*SeriesBlock) HasSeries 

func (blk *SeriesBlock) HasSeries(name []byte, tags models.Tags, buf []byte) (exists, tombstoned bool)

HasSeries returns flags indicating if the series exists and if it is tombstoned.

func (*SeriesBlock) Offset 

func (blk *SeriesBlock) Offset(name []byte, tags models.Tags, buf []byte) (offset uint32, tombstoned bool)

Offset returns the byte offset of the series within the block.

func (*SeriesBlock) Series 

func (blk *SeriesBlock) Series(name []byte, tags models.Tags) SeriesElem

Series returns a series element.

func (*SeriesBlock) SeriesCount 

func (blk *SeriesBlock) SeriesCount() uint32

SeriesCount returns the number of series.

func (*SeriesBlock) SeriesIterator 

func (blk *SeriesBlock) SeriesIterator() SeriesIterator

SeriesIterator returns an iterator over all the series.

func (*SeriesBlock) UnmarshalBinary 

func (blk *SeriesBlock) UnmarshalBinary(data []byte) error

UnmarshalBinary unpacks data into the series list.

If data is an mmap then it should stay open until the series list is no longer used because data access is performed directly from the byte slice.

type SeriesBlockElem 

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

SeriesBlockElem represents a series element in the series list.

func (*SeriesBlockElem) Deleted 

func (e *SeriesBlockElem) Deleted() bool

Deleted returns true if the tombstone flag is set.

func (*SeriesBlockElem) Expr 

func (e *SeriesBlockElem) Expr() influxql.Expr

Expr always returns a nil expression. This is only used by higher level query planning.

func (*SeriesBlockElem) Name 

func (e *SeriesBlockElem) Name() []byte

Name returns the measurement name.

func (*SeriesBlockElem) Tags 

func (e *SeriesBlockElem) Tags() models.Tags

Tags returns the tag set.

func (*SeriesBlockElem) UnmarshalBinary 

func (e *SeriesBlockElem) UnmarshalBinary(data []byte) error

UnmarshalBinary unmarshals data into e.

type SeriesBlockEncoder 

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

SeriesBlockEncoder encodes series to a SeriesBlock in an underlying writer.

func NewSeriesBlockEncoder 

func NewSeriesBlockEncoder(w io.Writer, n uint32, m, k uint64) *SeriesBlockEncoder

NewSeriesBlockEncoder returns a new instance of SeriesBlockEncoder.

func (*SeriesBlockEncoder) Close 

func (enc *SeriesBlockEncoder) Close() error

Close writes the index and trailer. This should be called at the end once all series have been encoded.

func (*SeriesBlockEncoder) Encode 

func (enc *SeriesBlockEncoder) Encode(name []byte, tags models.Tags, deleted bool) error

Encode writes a series to the underlying writer. The series must be lexicographical sorted after the previous encoded series.

func (*SeriesBlockEncoder) N 

func (enc *SeriesBlockEncoder) N() int64

N returns the number of bytes written.

type SeriesBlockTrailer 

type SeriesBlockTrailer struct {
	Series struct {
		Data struct {
			Offset int32
			Size   int32
		}
		Index struct {
			Offset int32
			Size   int32
			N      int32
		}
	}

	// Bloom filter info.
	Bloom struct {
		K      uint64
		Offset int32
		Size   int32
	}

	// Offset and size of cardinality sketch for measurements.
	Sketch struct {
		Offset int32
		Size   int32
	}

	// Offset and size of cardinality sketch for tombstoned measurements.
	TSketch struct {
		Offset int32
		Size   int32
	}

	SeriesN    int32
	TombstoneN int32
}

SeriesBlockTrailer represents meta data written to the end of the series list.

func ReadSeriesBlockTrailer 

func ReadSeriesBlockTrailer(data []byte) SeriesBlockTrailer

ReadSeriesBlockTrailer returns the series list trailer from data.

func (SeriesBlockTrailer) WriteTo 

func (t SeriesBlockTrailer) WriteTo(w io.Writer) (n int64, err error)

type SeriesElem 

type SeriesElem interface {
	Name() []byte
	Tags() models.Tags
	Deleted() bool

	// InfluxQL expression associated with series during filtering.
	Expr() influxql.Expr
}

SeriesElem represents a generic series element.

type SeriesIterator 

type SeriesIterator interface {
	Next() SeriesElem
}

SeriesIterator represents a iterator over a list of series.

func DifferenceSeriesIterators 

func DifferenceSeriesIterators(itr0, itr1 SeriesIterator) SeriesIterator

DifferenceSeriesIterators returns an iterator that only returns series which occur the first iterator but not the second iterator.

func FilterUndeletedSeriesIterator 

func FilterUndeletedSeriesIterator(itr SeriesIterator) SeriesIterator

FilterUndeletedSeriesIterator returns an iterator which filters all deleted series.

func IntersectSeriesIterators 

func IntersectSeriesIterators(itr0, itr1 SeriesIterator) SeriesIterator

IntersectSeriesIterators returns an iterator that only returns series which occur in both iterators. If both series have associated expressions then they are combined together.

func MergeSeriesIterators 

func MergeSeriesIterators(itrs ...SeriesIterator) SeriesIterator

MergeSeriesIterators returns an iterator that merges a set of iterators. Iterators that are first in the list take precendence and a deletion by those early iterators will invalidate elements by later iterators.

func UnionSeriesIterators 

func UnionSeriesIterators(itr0, itr1 SeriesIterator) SeriesIterator

UnionSeriesIterators returns an iterator that returns series from both both iterators. If both series have associated expressions then they are combined together.

type TagBlock 

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

TagBlock represents tag key/value block for a single measurement.

func (*TagBlock) TagKeyElem 

func (blk *TagBlock) TagKeyElem(key []byte) TagKeyElem

TagKeyElem returns an element for a tag key. Returns an element with a nil key if not found.

func (*TagBlock) TagKeyIterator 

func (blk *TagBlock) TagKeyIterator() TagKeyIterator

TagKeyIterator returns an iterator over all the keys in the block.

func (*TagBlock) TagValueElem 

func (blk *TagBlock) TagValueElem(key, value []byte) TagValueElem

TagValueElem returns an element for a tag value.

func (*TagBlock) UnmarshalBinary 

func (blk *TagBlock) UnmarshalBinary(data []byte) error

UnmarshalBinary unpacks data into the tag block. Tag block is not copied so data should be retained and unchanged after being passed into this function.

func (*TagBlock) Version 

func (blk *TagBlock) Version() int

Version returns the encoding version parsed from the data. Only valid after UnmarshalBinary() has been successfully invoked.

type TagBlockEncoder 

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

TagBlockEncoder encodes a tags to a TagBlock section.

func NewTagBlockEncoder 

func NewTagBlockEncoder(w io.Writer) *TagBlockEncoder

NewTagBlockEncoder returns a new TagBlockEncoder.

func (*TagBlockEncoder) Close 

func (enc *TagBlockEncoder) Close() error

Close flushes the trailer of the encoder to the writer.

func (*TagBlockEncoder) EncodeKey 

func (enc *TagBlockEncoder) EncodeKey(key []byte, deleted bool) error

EncodeKey writes a tag key to the underlying writer.

func (*TagBlockEncoder) EncodeValue 

func (enc *TagBlockEncoder) EncodeValue(value []byte, deleted bool, seriesIDs []uint32) error

EncodeValue writes a tag value to the underlying writer. The tag key must be lexicographical sorted after the previous encoded tag key.

func (*TagBlockEncoder) N 

func (enc *TagBlockEncoder) N() int64

N returns the number of bytes written.

type TagBlockKeyElem 

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

TagBlockKeyElem represents a tag key element in a TagBlock.

func (*TagBlockKeyElem) Deleted 

func (e *TagBlockKeyElem) Deleted() bool

Deleted returns true if the key has been tombstoned.

func (*TagBlockKeyElem) Key 

func (e *TagBlockKeyElem) Key() []byte

Key returns the key name of the element.

func (*TagBlockKeyElem) TagValueIterator 

func (e *TagBlockKeyElem) TagValueIterator() TagValueIterator

TagValueIterator returns an iterator over the key's values.

type TagBlockTrailer 

type TagBlockTrailer struct {
	Version int   // Encoding version
	Size    int64 // Total size w/ trailer

	// Offset & size of value data section.
	ValueData struct {
		Offset int64
		Size   int64
	}

	// Offset & size of key data section.
	KeyData struct {
		Offset int64
		Size   int64
	}

	// Offset & size of hash map section.
	HashIndex struct {
		Offset int64
		Size   int64
	}
}

TagBlockTrailer represents meta data at the end of a TagBlock.

func ReadTagBlockTrailer 

func ReadTagBlockTrailer(data []byte) (TagBlockTrailer, error)

ReadTagBlockTrailer returns the tag block trailer from data.

func (*TagBlockTrailer) WriteTo 

func (t *TagBlockTrailer) WriteTo(w io.Writer) (n int64, err error)

WriteTo writes the trailer to w.

type TagBlockValueElem 

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

TagBlockValueElem represents a tag value element.

func (*TagBlockValueElem) Deleted 

func (e *TagBlockValueElem) Deleted() bool

Deleted returns true if the element has been tombstoned.

func (*TagBlockValueElem) SeriesData 

func (e *TagBlockValueElem) SeriesData() []byte

SeriesData returns the raw series data.

func (*TagBlockValueElem) SeriesID 

func (e *TagBlockValueElem) SeriesID(i int) uint32

SeriesID returns series ID at an index.

func (*TagBlockValueElem) SeriesIDs 

func (e *TagBlockValueElem) SeriesIDs() []uint32

SeriesIDs returns a list decoded series ids.

func (*TagBlockValueElem) SeriesN 

func (e *TagBlockValueElem) SeriesN() uint32

SeriesN returns the series count.

func (*TagBlockValueElem) Size 

func (e *TagBlockValueElem) Size() int

Size returns the size of the element.

func (*TagBlockValueElem) Value 

func (e *TagBlockValueElem) Value() []byte

Value returns the value for the element.

type TagKeyElem 

type TagKeyElem interface {
	Key() []byte
	Deleted() bool
	TagValueIterator() TagValueIterator
}

TagKeyElem represents a generic tag key element.

type TagKeyIterator 

type TagKeyIterator interface {
	Next() TagKeyElem
}

TagKeyIterator represents a iterator over a list of tag keys.

func MergeTagKeyIterators 

func MergeTagKeyIterators(itrs ...TagKeyIterator) TagKeyIterator

MergeTagKeyIterators returns an iterator that merges a set of iterators. Iterators that are first in the list take precendence and a deletion by those early iterators will invalidate elements by later iterators.

type TagValueElem 

type TagValueElem interface {
	Value() []byte
	Deleted() bool
}

TagValueElem represents a generic tag value element.

type TagValueIterator 

type TagValueIterator interface {
	Next() TagValueElem
}

TagValueIterator represents a iterator over a list of tag values.

func MergeTagValueIterators 

func MergeTagValueIterators(itrs ...TagValueIterator) TagValueIterator

MergeTagValueIterators returns an iterator that merges a set of iterators. Iterators that are first in the list take precendence and a deletion by those early iterators will invalidate elements by later iterators.

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