tsdb

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 Go to latest Published: Feb 7, 2019 License: MIT Imports: 24 Imported by: 0

README

Line Protocol

The line protocol is a text based format for writing points to InfluxDB. Each line defines a single point. Multiple lines must be separated by the newline character \n. The format of the line consists of three parts:

[key] [fields] [timestamp]

Each section is separated by spaces. The minimum required point consists of a measurement name and at least one field. Points without a specified timestamp will be written using the server's local timestamp. Timestamps are assumed to be in nanoseconds unless a precision value is passed in the query string.

Key

The key is the measurement name and any optional tags separated by commas. Measurement names, tag keys, and tag values must escape any spaces or commas using a backslash (\). For example: \ and \,. All tag values are stored as strings and should not be surrounded in quotes.

Tags should be sorted by key before being sent for best performance. The sort should match that from the Go bytes.Compare function (http://golang.org/pkg/bytes/#Compare).

Examples
# measurement only
cpu

# measurement and tags
cpu,host=serverA,region=us-west

# measurement with commas
cpu\,01,host=serverA,region=us-west

# tag value with spaces
cpu,host=server\ A,region=us\ west

Fields

Fields are key-value metrics associated with the measurement. Every line must have at least one field. Multiple fields must be separated with commas and not spaces.

Field keys are always strings and follow the same syntactical rules as described above for tag keys and values. Field values can be one of four types. The first value written for a given field on a given measurement defines the type of that field for all series under that measurement.

  • integer - Numeric values that do not include a decimal and are followed by a trailing i when inserted (e.g. 1i, 345i, 2015i, -10i). Note that all values must have a trailing i. If they do not they will be written as floats.
  • float - Numeric values that are not followed by a trailing i. (e.g. 1, 1.0, -3.14, 6.0+e5, 10).
  • boolean - A value indicating true or false. Valid boolean strings are (t, T, true, TRUE, f, F, false, and FALSE).
  • string - A text value. All string values must be surrounded in double-quotes ". If the string contains a double-quote or backslashes, it must be escaped with a backslash, e.g. \", \\.
# integer value
cpu value=1i

cpu value=1.1i # will result in a parse error

# float value
cpu_load value=1

cpu_load value=1.0

cpu_load value=1.2

# boolean value
error fatal=true

# string value
event msg="logged out"

# multiple values
cpu load=10,alert=true,reason="value above maximum threshold"

Timestamp

The timestamp section is optional but should be specified if possible. The value is an integer representing nanoseconds since the epoch. If the timestamp is not provided the point will inherit the server's local timestamp.

Some write APIs allow passing a lower precision. If the API supports a lower precision, the timestamp may also be an integer epoch in microseconds, milliseconds, seconds, minutes or hours.

Full Example

A full example is shown below.

cpu,host=server01,region=uswest value=1 1434055562000000000
cpu,host=server02,region=uswest value=3 1434055562000010000

In this example the first line shows a measurement of "cpu", there are two tags "host" and "region, the value is 1.0, and the timestamp is 1434055562000000000. Following this is a second line, also a point in the measurement "cpu" but belonging to a different "host".

cpu,host=server\ 01,region=uswest value=1,msg="all systems nominal"
cpu,host=server\ 01,region=us\,west value_int=1i

In these examples, the "host" is set to server 01. The field value associated with field key msg is double-quoted, as it is a string. The second example shows a region of us,west with the comma properly escaped. In the first example value is written as a floating point number. In the second, value_int is an integer.

Distributed Queries

Documentation

Overview

Package tsdb implements a durable time series database.

Index

Constants

View Source 
const (
	// DefaultEngine is the default engine for new shards
	DefaultEngine = "tsm1"

	// DefaultCacheMaxMemorySize is the maximum size a shard's cache can
	// reach before it starts rejecting writes.
	DefaultCacheMaxMemorySize = 1024 * 1024 * 1024 // 1GB

	// DefaultCacheSnapshotMemorySize is the size at which the engine will
	// snapshot the cache and write it to a TSM file, freeing up memory
	DefaultCacheSnapshotMemorySize = 25 * 1024 * 1024 // 25MB

	// DefaultCacheSnapshotWriteColdDuration is the length of time at which
	// the engine will snapshot the cache and write it to a new TSM file if
	// the shard hasn't received writes or deletes
	DefaultCacheSnapshotWriteColdDuration = time.Duration(10 * time.Minute)

	// DefaultCompactFullWriteColdDuration is the duration at which the engine
	// will compact all TSM files in a shard if it hasn't received a write or delete
	DefaultCompactFullWriteColdDuration = time.Duration(4 * time.Hour)

	// DefaultMaxPointsPerBlock is the maximum number of points in an encoded
	// block in a TSM file
	DefaultMaxPointsPerBlock = 1000

	// DefaultMaxSeriesPerDatabase is the maximum number of series a node can hold per database.
	DefaultMaxSeriesPerDatabase = 1000000

	// DefaultMaxValuesPerTag is the maximum number of values a tag can have within a measurement.
	DefaultMaxValuesPerTag = 100000
)
View Source 
const EOF = influxql.ZeroTime

EOF represents a "not found" key returned by a Cursor.

Variables

View Source 
var (
	// ErrFormatNotFound is returned when no format can be determined from a path.
	ErrFormatNotFound = errors.New("format not found")

	// ErrUnknownEngineFormat is returned when the engine format is
	// unknown. ErrUnknownEngineFormat is currently returned if a format
	// other than tsm1 is encountered.
	ErrUnknownEngineFormat = errors.New("unknown engine format")
)
View Source 
var (
	// ErrFieldOverflow is returned when too many fields are created on a measurement.
	ErrFieldOverflow = errors.New("field overflow")

	// ErrFieldTypeConflict is returned when a new field already exists with a different type.
	ErrFieldTypeConflict = errors.New("field type conflict")

	// ErrFieldNotFound is returned when a field cannot be found.
	ErrFieldNotFound = errors.New("field not found")

	// ErrFieldUnmappedID is returned when the system is presented, during decode, with a field ID
	// there is no mapping for.
	ErrFieldUnmappedID = errors.New("field ID not mapped")

	// ErrEngineClosed is returned when a caller attempts indirectly to
	// access the shard's underlying engine.
	ErrEngineClosed = errors.New("engine is closed")

	// ErrShardDisabled is returned when a the shard is not available for
	// queries or writes.
	ErrShardDisabled = errors.New("shard is disabled")
)
View Source 
var (
	// ErrShardNotFound is returned when trying to get a non existing shard.
	ErrShardNotFound = fmt.Errorf("shard not found")
	// ErrStoreClosed is returned when trying to use a closed Store.
	ErrStoreClosed = fmt.Errorf("store is closed")
)

Functions

func DecodeStorePath 

func DecodeStorePath(shardOrWALPath string) (database, retentionPolicy string)

DecodeStorePath extracts the database and retention policy names from a given shard or WAL path.

func MarshalTags 

func MarshalTags(tags map[string]string) []byte

MarshalTags converts a tag set to bytes for use as a lookup key.

func MeasurementFromSeriesKey 

func MeasurementFromSeriesKey(key string) string

MeasurementFromSeriesKey returns the name of the measurement from a key that contains a measurement name.

func NewFieldKeysIterator 

func NewFieldKeysIterator(sh *Shard, opt influxql.IteratorOptions) (influxql.Iterator, error)

NewFieldKeysIterator returns an iterator that can be iterated over to retrieve field keys.

func NewSeriesIterator 

func NewSeriesIterator(sh *Shard, opt influxql.IteratorOptions) (influxql.Iterator, error)

NewSeriesIterator returns a new instance of SeriesIterator.

func NewShardError 

func NewShardError(id uint64, err error) error

NewShardError returns a new ShardError.

func NewTagKeysIterator 

func NewTagKeysIterator(sh *Shard, opt influxql.IteratorOptions) (influxql.Iterator, error)

NewTagKeysIterator returns a new instance of TagKeysIterator.

func NewTagValuesIterator 

func NewTagValuesIterator(sh *Shard, opt influxql.IteratorOptions) (influxql.Iterator, error)

NewTagValuesIterator returns a new instance of TagValuesIterator.

func RegisterEngine 

func RegisterEngine(name string, fn NewEngineFunc)

RegisterEngine registers a storage engine initializer by name.

func RegisteredEngines 

func RegisteredEngines() []string

RegisteredEngines returns the slice of currently registered engines.

Types

type Config 

type Config struct {
	Dir    string `toml:"dir"`
	Engine string `toml:"-"`

	// General WAL configuration options
	WALDir string `toml:"wal-dir"`

	// Query logging
	QueryLogEnabled bool `toml:"query-log-enabled"`

	// Compaction options for tsm1 (descriptions above with defaults)
	CacheMaxMemorySize             uint64        `toml:"cache-max-memory-size"`
	CacheSnapshotMemorySize        uint64        `toml:"cache-snapshot-memory-size"`
	CacheSnapshotWriteColdDuration toml.Duration `toml:"cache-snapshot-write-cold-duration"`
	CompactFullWriteColdDuration   toml.Duration `toml:"compact-full-write-cold-duration"`

	// MaxSeriesPerDatabase is the maximum number of series a node can hold per database.
	// When this limit is exceeded, writes return a 'max series per database exceeded' error.
	// A value of 0 disables the limit.
	MaxSeriesPerDatabase int `toml:"max-series-per-database"`

	// MaxValuesPerTag is the maximum number of tag values a single tag key can have within
	// a measurement.  When the limit is execeeded, writes return an error.
	// A value of 0 disables the limit.
	MaxValuesPerTag int `toml:"max-values-per-tag"`

	TraceLoggingEnabled bool `toml:"trace-logging-enabled"`
}

Config holds the configuration for the tsbd package.

func NewConfig 

func NewConfig() Config

NewConfig returns the default configuration for tsdb.

func (*Config) Validate 

func (c *Config) Validate() error

Validate validates the configuration hold by c.

type Cursor 

type Cursor interface {
	SeekTo(seek int64) (key int64, value interface{})
	Next() (key int64, value interface{})
	Ascending() bool
}

Cursor represents an iterator over a series.

type DatabaseIndex 

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

DatabaseIndex is the in memory index of a collection of measurements, time series, and their tags. Exported functions are goroutine safe while un-exported functions assume the caller will use the appropriate locks.

func NewDatabaseIndex 

func NewDatabaseIndex(name string) *DatabaseIndex

NewDatabaseIndex returns a new initialized DatabaseIndex.

func (*DatabaseIndex) AssignShard 

func (d *DatabaseIndex) AssignShard(k string, shardID uint64)

AssignShard updates the index to indicate that series k exists in the given shardID.

func (*DatabaseIndex) CreateMeasurementIndexIfNotExists 

func (d *DatabaseIndex) CreateMeasurementIndexIfNotExists(name string) *Measurement

CreateMeasurementIndexIfNotExists creates or retrieves an in-memory index object for the measurement.

func (*DatabaseIndex) CreateSeriesIndexIfNotExists 

func (d *DatabaseIndex) CreateSeriesIndexIfNotExists(measurementName string, series *Series, forceCopy bool) *Series

CreateSeriesIndexIfNotExists adds the series for the given measurement to the index and sets its ID or returns the existing series object.

func (*DatabaseIndex) Dereference 

func (d *DatabaseIndex) Dereference(b []byte)

Dereference removes all references to data within b and moves them to the heap.

func (*DatabaseIndex) DropMeasurement 

func (d *DatabaseIndex) DropMeasurement(name string)

DropMeasurement removes the measurement and all of its underlying series from the database index.

func (*DatabaseIndex) DropSeries 

func (d *DatabaseIndex) DropSeries(keys []string)

DropSeries removes the series keys and their tags from the index.

func (*DatabaseIndex) Measurement 

func (d *DatabaseIndex) Measurement(name string) *Measurement

Measurement returns the measurement object from the index by the name.

func (*DatabaseIndex) MeasurementSeriesCounts 

func (d *DatabaseIndex) MeasurementSeriesCounts() (nMeasurements int, nSeries int)

MeasurementSeriesCounts returns the number of measurements and series currently indexed by the database. Useful for reporting and monitoring.

func (*DatabaseIndex) Measurements 

func (d *DatabaseIndex) Measurements() Measurements

Measurements returns a list of all measurements.

func (*DatabaseIndex) MeasurementsByExpr 

func (d *DatabaseIndex) MeasurementsByExpr(expr influxql.Expr) (Measurements, bool, error)

MeasurementsByExpr takes an expression containing only tags and returns a list of matching *Measurement. The bool return argument returns if the expression was a measurement expression. It is used to differentiate a list of no measurements because all measurements were filtered out (when the bool is true) against when there are no measurements because the expression wasn't evaluated (when the bool is false).

func (*DatabaseIndex) MeasurementsByName 

func (d *DatabaseIndex) MeasurementsByName(names []string) []*Measurement

MeasurementsByName returns a list of all the measurements in the index that match any entry in names.

func (*DatabaseIndex) MeasurementsByRegex 

func (d *DatabaseIndex) MeasurementsByRegex(re *regexp.Regexp) Measurements

MeasurementsByRegex returns the measurements that match the regex.

func (*DatabaseIndex) RemoveShard 

func (d *DatabaseIndex) RemoveShard(shardID uint64)

RemoveShard removes all references to shardID from any series or measurements in the index. If the shard was the only owner of data for the series, the series is removed from the index.

func (*DatabaseIndex) Series 

func (d *DatabaseIndex) Series(key string) *Series

Series returns a series by key.

func (*DatabaseIndex) SeriesBytes 

func (d *DatabaseIndex) SeriesBytes(key []byte) *Series

SeriesBytes returns a series by key.

func (*DatabaseIndex) SeriesKeys 

func (d *DatabaseIndex) SeriesKeys() []string

SeriesKeys returns a sorted slice of strings indicating all the series keys in the index.

func (*DatabaseIndex) SeriesN 

func (d *DatabaseIndex) SeriesN() int

SeriesN returns the number of series.

func (*DatabaseIndex) SeriesShardN 

func (d *DatabaseIndex) SeriesShardN(shardID uint64) int

SeriesShardN returns the series count for a shard.

func (*DatabaseIndex) Statistics 

func (d *DatabaseIndex) Statistics(tags map[string]string) []models.Statistic

Statistics returns statistics for periodic monitoring.

func (*DatabaseIndex) TagsForSeries 

func (d *DatabaseIndex) TagsForSeries(key string) models.Tags

TagsForSeries returns the tag map for the passed in series

func (*DatabaseIndex) UnassignShard 

func (d *DatabaseIndex) UnassignShard(k string, shardID uint64)

UnassignShard updates the index to indicate that series k does not exist in the given shardID.

type Engine 

type Engine interface {
	Open() error
	Close() error

	WithLogger(zap.Logger)
	LoadMetadataIndex(shardID uint64, index *DatabaseIndex) error

	Backup(w io.Writer, basePath string, since time.Time) error
	Restore(r io.Reader, basePath string) error

	CreateIterator(measurement string, opt influxql.IteratorOptions) (influxql.Iterator, error)
	WritePoints(points []models.Point) error
	ContainsSeries(keys []string) (map[string]bool, error)
	DeleteSeries(keys []string) error
	DeleteSeriesRange(keys []string, min, max int64) error
	DeleteMeasurement(name string, seriesKeys []string) error
	SeriesCount() (n int, err error)
	MeasurementFields(measurement string) *MeasurementFields
	CreateSnapshot() (string, error)
	SetEnabled(enabled bool)

	// Format will return the format for the engine
	Format() EngineFormat

	// Statistics will return statistics relevant to this engine.
	Statistics(tags map[string]string) []models.Statistic
	LastModified() time.Time

	io.WriterTo
}

Engine represents a swappable storage engine for the shard.

func NewEngine 

func NewEngine(id uint64, path string, walPath string, options EngineOptions) (Engine, error)

NewEngine returns an instance of an engine based on its format. If the path does not exist then the DefaultFormat is used.

type EngineFormat 

type EngineFormat int

EngineFormat represents the format for an engine. 

const (
	// TSM1Format is the format used by the tsm1 engine.
	TSM1Format EngineFormat = 2
)

type EngineOptions 

type EngineOptions struct {
	EngineVersion string
	ShardID       uint64

	Config Config
}

EngineOptions represents the options used to initialize the engine.

func NewEngineOptions 

func NewEngineOptions() EngineOptions

NewEngineOptions returns the default options.

type Field 

type Field struct {
	ID   uint8             `json:"id,omitempty"`
	Name string            `json:"name,omitempty"`
	Type influxql.DataType `json:"type,omitempty"`
}

Field represents a series field.

type FieldCreate 

type FieldCreate struct {
	Measurement string
	Field       *Field
}

FieldCreate holds information for a field to create on a measurement.

type FilterExprs 

type FilterExprs map[uint64]influxql.Expr

FilterExprs represents a map of series IDs to filter expressions.

func (FilterExprs) DeleteBoolLiteralTrues 

func (fe FilterExprs) DeleteBoolLiteralTrues()

DeleteBoolLiteralTrues deletes all elements whose filter expression is a boolean literal true.

func (FilterExprs) Len 

func (fe FilterExprs) Len() int

Len returns the number of elements.

type IndexStatistics 

type IndexStatistics struct {
	NumSeries              int64
	NumMeasurements        int64
	NumSeriesDropped       int64
	NumMeasurementsDropped int64
}

IndexStatistics maintains statistics for the index.

type KeyValue 

type KeyValue struct {
	Key, Value string
}

KeyValue holds a string key and a string value.

type KeyValues 

type KeyValues []KeyValue

KeyValues is a sortable slice of KeyValue.

func (KeyValues) Len 

func (a KeyValues) Len() int

Len implements sort.Interface.

func (KeyValues) Less 

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

Less implements sort.Interface. Keys are compared before values.

func (KeyValues) Swap 

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

Swap implements sort.Interface.

type Measurement 

type Measurement struct {
	Name string `json:"name,omitempty"`
	// contains filtered or unexported fields
}

Measurement represents a collection of time series in a database. It also contains in-memory structures for indexing tags. Exported functions are goroutine safe while un-exported functions assume the caller will use the appropriate locks.

func NewMeasurement 

func NewMeasurement(name string) *Measurement

NewMeasurement allocates and initializes a new Measurement.

func (*Measurement) AddSeries 

func (m *Measurement) AddSeries(s *Series) bool

AddSeries adds a series to the measurement's index. It returns true if the series was added successfully or false if the series was already present.

func (*Measurement) AppendSeriesKeysByID 

func (m *Measurement) AppendSeriesKeysByID(dst []string, ids []uint64) []string

AppendSeriesKeysByID appends keys for a list of series ids to a buffer.

func (*Measurement) Cardinality 

func (m *Measurement) Cardinality(key string) int

Cardinality returns the number of values associated with the given tag key.

func (*Measurement) CardinalityBytes 

func (m *Measurement) CardinalityBytes(key []byte) int

CardinalityBytes returns the number of values associated with the given tag key.

func (*Measurement) DropSeries 

func (m *Measurement) DropSeries(series *Series)

DropSeries removes a series from the measurement's index.

func (*Measurement) FieldNames 

func (m *Measurement) FieldNames() []string

FieldNames returns a list of the measurement's field names, in an arbitrary order.

func (*Measurement) HasField 

func (m *Measurement) HasField(name string) bool

HasField returns true if the measurement has a field by the given name.

func (*Measurement) HasSeries 

func (m *Measurement) HasSeries() bool

HasSeries returns true if there is at least 1 series under this measurement.

func (*Measurement) HasTagKey 

func (m *Measurement) HasTagKey(k string) bool

HasTagKey returns true if at least one series in this measurement has written a value for the passed in tag key.

func (*Measurement) HasTagKeyValue 

func (m *Measurement) HasTagKeyValue(k, v []byte) bool

HasTagKeyValue returns true if at least one series in this measurement has written a value the given tag key and tag value.

func (*Measurement) IDsForExpr 

func (m *Measurement) IDsForExpr(n *influxql.BinaryExpr) SeriesIDs

IDsForExpr returns the series IDs that are candidates to match the given expression.

func (*Measurement) SeriesByID 

func (m *Measurement) SeriesByID(id uint64) *Series

SeriesByID returns a series by identifier.

func (*Measurement) SeriesByIDSlice 

func (m *Measurement) SeriesByIDSlice(ids []uint64) []*Series

SeriesByIDSlice returns a list of series by identifiers.

func (*Measurement) SeriesIDsAllOrByExpr 

func (m *Measurement) SeriesIDsAllOrByExpr(expr influxql.Expr) (SeriesIDs, error)

SeriesIDsAllOrByExpr walks an expressions for matching series IDs or, if no expression is given, returns all series IDs for the measurement.

func (*Measurement) SeriesKeys 

func (m *Measurement) SeriesKeys() []string

SeriesKeys returns the keys of every series in this measurement.

func (*Measurement) SetFieldName 

func (m *Measurement) SetFieldName(name string)

SetFieldName adds the field name to the measurement.

func (*Measurement) TagKeys 

func (m *Measurement) TagKeys() []string

TagKeys returns a list of the measurement's tag names, in sorted order.

func (*Measurement) TagKeysByExpr 

func (m *Measurement) TagKeysByExpr(expr influxql.Expr) (stringSet, bool, error)

tagKeysByExpr extracts the tag keys wanted by the expression.

func (*Measurement) TagSets 

func (m *Measurement) TagSets(shardID uint64, dimensions []string, condition influxql.Expr) ([]*influxql.TagSet, error)

TagSets returns the unique tag sets that exist for the given tag keys. This is used to determine what composite series will be created by a group by. i.e. "group by region" should return: 

{"region":"uswest"}, {"region":"useast"}

or region, service returns 

{"region": "uswest", "service": "redis"}, {"region": "uswest", "service": "mysql"}, ...

This will also populate the TagSet objects with the series IDs that match each tagset and any influx filter expression that goes with the series TODO: this shouldn't be exported. However, until tx.go and the engine get refactored into tsdb, we need it.

func (*Measurement) TagValues 

func (m *Measurement) TagValues(key string) []string

TagValues returns all the values for the given tag key, in an arbitrary order.

func (*Measurement) ValidateGroupBy 

func (m *Measurement) ValidateGroupBy(stmt *influxql.SelectStatement) error

ValidateGroupBy ensures that the GROUP BY is not a field.

func (*Measurement) WalkTagKeys 

func (m *Measurement) WalkTagKeys(fn func(k string))

WalkTagKeys calls fn for each tag key associated with m. The order of the keys is undefined.

type MeasurementFields 

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

MeasurementFields holds the fields of a measurement and their codec.

func NewMeasurementFields 

func NewMeasurementFields() *MeasurementFields

NewMeasurementFields returns an initialised *MeasurementFields value.

func (*MeasurementFields) CreateFieldIfNotExists 

func (m *MeasurementFields) CreateFieldIfNotExists(name string, typ influxql.DataType, limitCount bool) error

CreateFieldIfNotExists creates a new field with an autoincrementing ID. Returns an error if 255 fields have already been created on the measurement or the fields already exists with a different type.

func (*MeasurementFields) Field 

func (m *MeasurementFields) Field(name string) *Field

Field returns the field for name, or nil if there is no field for name.

func (*MeasurementFields) FieldBytes 

func (m *MeasurementFields) FieldBytes(name []byte) *Field

FieldBytes returns the field for name, or nil if there is no field for name. FieldBytes should be preferred to Field when the caller has a []byte, because it avoids a string allocation, which can't be avoided if the caller converts the []byte to a string and calls Field.

func (*MeasurementFields) FieldSet 

func (m *MeasurementFields) FieldSet() map[string]influxql.DataType

FieldSet returns the set of fields and their types for the measurement.

func (*MeasurementFields) MarshalBinary 

func (m *MeasurementFields) MarshalBinary() ([]byte, error)

MarshalBinary encodes the object to a binary format.

func (*MeasurementFields) UnmarshalBinary 

func (m *MeasurementFields) UnmarshalBinary(buf []byte) error

UnmarshalBinary decodes the object from a binary format.

type Measurements 

type Measurements []*Measurement

Measurements represents a list of *Measurement.

func (Measurements) Len 

func (a Measurements) Len() int

Len implements sort.Interface.

func (Measurements) Less 

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

Less implements sort.Interface.

func (Measurements) Swap 

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

Swap implements sort.Interface.

type NewEngineFunc 

type NewEngineFunc func(id uint64, path string, walPath string, options EngineOptions) Engine

NewEngineFunc creates a new engine.

type PartialWriteError 

type PartialWriteError struct {
	Reason  string
	Dropped int
}

PartialWriteError indicates a write request could only write a portion of the requested values.

func (PartialWriteError) Error 

func (e PartialWriteError) Error() string

type PointBatcher 

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

PointBatcher accepts Points and will emit a batch of those points when either a) the batch reaches a certain size, or b) a certain time passes.

func NewPointBatcher 

func NewPointBatcher(sz int, bp int, d time.Duration) *PointBatcher

NewPointBatcher returns a new PointBatcher. sz is the batching size, bp is the maximum number of batches that may be pending. d is the time after which a batch will be emitted after the first point is received for the batch, regardless of its size.

func (*PointBatcher) Flush 

func (b *PointBatcher) Flush()

Flush instructs the batcher to emit any pending points in a batch, regardless of batch size. If there are no pending points, no batch is emitted.

func (*PointBatcher) In 

func (b *PointBatcher) In() chan<- models.Point

In returns the channel to which points should be written.

func (*PointBatcher) Out 

func (b *PointBatcher) Out() <-chan []models.Point

Out returns the channel from which batches should be read.

func (*PointBatcher) Start 

func (b *PointBatcher) Start()

Start starts the batching process. Returns the in and out channels for points and point-batches respectively.

func (*PointBatcher) Stats 

func (b *PointBatcher) Stats() *PointBatcherStats

Stats returns a PointBatcherStats object for the PointBatcher. While the each statistic should be closely correlated with each other statistic, it is not guaranteed.

func (*PointBatcher) Stop 

func (b *PointBatcher) Stop()

Stop stops the batching process. Stop waits for the batching routine to stop before returning.

type PointBatcherStats 

type PointBatcherStats struct {
	BatchTotal   uint64 // Total count of batches transmitted.
	PointTotal   uint64 // Total count of points processed.
	SizeTotal    uint64 // Number of batches that reached size threshold.
	TimeoutTotal uint64 // Number of timeouts that occurred.
}

PointBatcherStats are the statistics each batcher tracks.

type Series 

type Series struct {
	Key string

	ID uint64
	// contains filtered or unexported fields
}

Series belong to a Measurement and represent unique time series in a database.

func NewSeries 

func NewSeries(key string, tags models.Tags) *Series

NewSeries returns an initialized series struct.

func (*Series) AssignShard 

func (s *Series) AssignShard(shardID uint64)

AssignShard adds shardID to the list of shards this series is assigned to.

func (*Series) Assigned 

func (s *Series) Assigned(shardID uint64) bool

Assigned returns whether this series is assigned to the given shard.

func (*Series) CopyTags 

func (s *Series) CopyTags()

CopyTags clones the tags on the series in-place,

func (*Series) Dereference 

func (s *Series) Dereference(b []byte)

Dereference removes references to a byte slice.

func (*Series) ForEachTag 

func (s *Series) ForEachTag(fn func(models.Tag))

ForEachTag executes fn for every tag. Iteration occurs under lock.

func (*Series) GetTagString 

func (s *Series) GetTagString(key string) string

GetTagString returns a tag value under lock.

func (*Series) MarshalBinary 

func (s *Series) MarshalBinary() ([]byte, error)

MarshalBinary encodes the object to a binary format.

func (*Series) ShardN 

func (s *Series) ShardN() int

ShardN returns the number of shards this series is assigned to.

func (*Series) Tags 

func (s *Series) Tags() models.Tags

Tags returns a copy of the tags under lock.

func (*Series) UnassignShard 

func (s *Series) UnassignShard(shardID uint64)

UnassignShard removes the shardID from the list of shards this series is assigned to.

func (*Series) UnmarshalBinary 

func (s *Series) UnmarshalBinary(buf []byte) error

UnmarshalBinary decodes the object from a binary format.

type SeriesCreate 

type SeriesCreate struct {
	Measurement string
	Series      *Series
}

SeriesCreate holds information for a series to create.

type SeriesIDs 

type SeriesIDs []uint64

SeriesIDs is a convenience type for sorting, checking equality, and doing union and intersection of collections of series ids.

func (SeriesIDs) Equals 

func (a SeriesIDs) Equals(other SeriesIDs) bool

Equals assumes that both are sorted.

func (SeriesIDs) Intersect 

func (a SeriesIDs) Intersect(other SeriesIDs) SeriesIDs

Intersect returns a new collection of series ids in sorted order that is the intersection of the two. The two collections must already be sorted.

func (SeriesIDs) Len 

func (a SeriesIDs) Len() int

Len implements sort.Interface.

func (SeriesIDs) Less 

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

Less implements sort.Interface.

func (SeriesIDs) Reject 

func (a SeriesIDs) Reject(other SeriesIDs) SeriesIDs

Reject returns a new collection of series ids in sorted order with the passed in set removed from the original. This is useful for the NOT operator. The two collections must already be sorted.

func (SeriesIDs) Swap 

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

Swap implements sort.Interface.

func (SeriesIDs) Union 

func (a SeriesIDs) Union(other SeriesIDs) SeriesIDs

Union returns a new collection of series ids in sorted order that is the union of the two. The two collections must already be sorted.

type Shard 

type Shard struct {
	EnableOnOpen bool
	// contains filtered or unexported fields
}

Shard represents a self-contained time series database. An inverted index of the measurement and tag data is kept along with the raw time series data. Data can be split across many shards. The query engine in TSDB is responsible for combining the output of many shards into a single query result.

func NewShard 

func NewShard(id uint64, index *DatabaseIndex, path string, walPath string, options EngineOptions) *Shard

NewShard returns a new initialized Shard.

func (*Shard) Close 

func (s *Shard) Close() error

Close shuts down the shard's store.

func (*Shard) ContainsSeries 

func (s *Shard) ContainsSeries(seriesKeys []string) (map[string]bool, error)

ContainsSeries determines if the shard contains the provided series keys. The returned map contains all the provided keys that are in the shard, and the value for each key will be true if the shard has values for that key.

func (*Shard) CreateIterator 

func (s *Shard) CreateIterator(measurement string, opt influxql.IteratorOptions) (influxql.Iterator, error)

CreateIterator returns an iterator for the data in the shard.

func (*Shard) CreateSnapshot 

func (s *Shard) CreateSnapshot() (string, error)

CreateSnapshot will return a path to a temp directory containing hard links to the underlying shard files.

func (*Shard) DeleteMeasurement 

func (s *Shard) DeleteMeasurement(name string, seriesKeys []string) error

DeleteMeasurement deletes a measurement and all underlying series.

func (*Shard) DeleteSeries 

func (s *Shard) DeleteSeries(seriesKeys []string) error

DeleteSeries deletes a list of series.

func (*Shard) DeleteSeriesRange 

func (s *Shard) DeleteSeriesRange(seriesKeys []string, min, max int64) error

DeleteSeriesRange deletes all values from seriesKeys with timestamps between min and max (inclusive).

func (*Shard) DiskSize 

func (s *Shard) DiskSize() (int64, error)

DiskSize returns the size on disk of this shard.

func (*Shard) ExpandSources 

func (s *Shard) ExpandSources(sources influxql.Sources) (influxql.Sources, error)

ExpandSources expands regex sources and removes duplicates. NOTE: sources must be normalized (db and rp set) before calling this function.

func (*Shard) FieldDimensions 

func (s *Shard) FieldDimensions(measurements []string) (fields map[string]influxql.DataType, dimensions map[string]struct{}, err error)

FieldDimensions returns unique sets of fields and dimensions across a list of sources.

func (*Shard) LastModified 

func (s *Shard) LastModified() time.Time

LastModified returns the time when this shard was last modified.

func (*Shard) MapType 

func (s *Shard) MapType(measurement, field string) influxql.DataType

MapType returns the data type for the field within the measurement.

func (*Shard) MeasurementsByRegex 

func (s *Shard) MeasurementsByRegex(re *regexp.Regexp) []string

func (*Shard) Open 

func (s *Shard) Open() error

Open initializes and opens the shard's store.

func (*Shard) Path 

func (s *Shard) Path() string

Path returns the path set on the shard when it was created.

func (*Shard) Restore 

func (s *Shard) Restore(r io.Reader, basePath string) error

Restore restores data to the underlying engine for the shard. The shard is reopened after restore.

func (*Shard) SeriesCount 

func (s *Shard) SeriesCount() (int, error)

SeriesCount returns the number of series buckets on the shard.

func (*Shard) SetEnabled 

func (s *Shard) SetEnabled(enabled bool)

SetEnabled enables the shard for queries and write. When disabled, all writes and queries return an error and compactions are stopped for the shard.

func (*Shard) Statistics 

func (s *Shard) Statistics(tags map[string]string) []models.Statistic

Statistics returns statistics for periodic monitoring.

func (*Shard) UnloadIndex 

func (s *Shard) UnloadIndex()

UnloadIndex removes all references to this shard from the DatabaseIndex

func (*Shard) WithLogger 

func (s *Shard) WithLogger(log zap.Logger)

WithLogger sets the logger on the shard.

func (*Shard) WritePoints 

func (s *Shard) WritePoints(points []models.Point) error

WritePoints will write the raw data points and any new metadata to the index in the shard.

func (*Shard) WriteTo 

func (s *Shard) WriteTo(w io.Writer) (int64, error)

WriteTo writes the shard's data to w.

type ShardError 

type ShardError struct {
	Err error
	// contains filtered or unexported fields
}

A ShardError implements the error interface, and contains extra context about the shard that generated the error.

func (ShardError) Error 

func (e ShardError) Error() string

Error returns the string representation of the error, to satisfy the error interface.

type ShardGroup 

type ShardGroup interface {
	MeasurementsByRegex(re *regexp.Regexp) []string
	FieldDimensions(measurements []string) (fields map[string]influxql.DataType, dimensions map[string]struct{}, err error)
	MapType(measurement, field string) influxql.DataType
	CreateIterator(measurement string, opt influxql.IteratorOptions) (influxql.Iterator, error)
	ExpandSources(sources influxql.Sources) (influxql.Sources, error)
}

type ShardStatistics 

type ShardStatistics struct {
	WriteReq           int64
	WriteReqOK         int64
	WriteReqErr        int64
	SeriesCreated      int64
	FieldsCreated      int64
	WritePointsErr     int64
	WritePointsDropped int64
	WritePointsOK      int64
	BytesWritten       int64
	DiskBytes          int64
}

ShardStatistics maintains statistics for a shard.

type Shards 

type Shards []*Shard

Shards represents a sortable list of shards.

func (Shards) CreateIterator 

func (a Shards) CreateIterator(measurement string, opt influxql.IteratorOptions) (influxql.Iterator, error)

func (Shards) ExpandSources 

func (a Shards) ExpandSources(sources influxql.Sources) (influxql.Sources, error)

func (Shards) FieldDimensions 

func (a Shards) FieldDimensions(measurements []string) (fields map[string]influxql.DataType, dimensions map[string]struct{}, err error)

func (Shards) Len 

func (a Shards) Len() int

Len implements sort.Interface.

func (Shards) Less 

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

Less implements sort.Interface.

func (Shards) MapType 

func (a Shards) MapType(measurement, field string) influxql.DataType

func (Shards) MeasurementsByRegex 

func (a Shards) MeasurementsByRegex(re *regexp.Regexp) []string

func (Shards) Swap 

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

Swap implements sort.Interface.

type Store 

type Store struct {
	EngineOptions EngineOptions

	Logger zap.Logger
	// contains filtered or unexported fields
}

Store manages shards and indexes for databases.

func NewStore 

func NewStore(path string) *Store

NewStore returns a new store with the given path and a default configuration. The returned store must be initialized by calling Open before using it.

func (*Store) BackupShard 

func (s *Store) BackupShard(id uint64, since time.Time, w io.Writer) error

BackupShard will get the shard and have the engine backup since the passed in time to the writer.

func (*Store) Close 

func (s *Store) Close() error

Close closes the store and all associated shards. After calling Close accessing shards through the Store will result in ErrStoreClosed being returned.

func (*Store) CreateShard 

func (s *Store) CreateShard(database, retentionPolicy string, shardID uint64, enabled bool) error

CreateShard creates a shard with the given id and retention policy on a database.

func (*Store) CreateShardSnapshot 

func (s *Store) CreateShardSnapshot(id uint64) (string, error)

CreateShardSnapShot will create a hard link to the underlying shard and return a path. The caller is responsible for cleaning up (removing) the file path returned.

func (*Store) DatabaseIndex 

func (s *Store) DatabaseIndex(name string) *DatabaseIndex

DatabaseIndex returns the index for a database by its name.

func (*Store) DatabaseIndexN 

func (s *Store) DatabaseIndexN() int

DatabaseIndexN returns the number of databases indices in the store.

func (*Store) Databases 

func (s *Store) Databases() []string

Databases returns all the databases in the indexes.

func (*Store) DeleteDatabase 

func (s *Store) DeleteDatabase(name string) error

DeleteDatabase will close all shards associated with a database and remove the directory and files from disk.

func (*Store) DeleteMeasurement 

func (s *Store) DeleteMeasurement(database, name string) error

DeleteMeasurement removes a measurement and all associated series from a database.

func (*Store) DeleteRetentionPolicy 

func (s *Store) DeleteRetentionPolicy(database, name string) error

DeleteRetentionPolicy will close all shards associated with the provided retention policy, remove the retention policy directories on both the DB and WAL, and remove all shard files from disk.

func (*Store) DeleteSeries 

func (s *Store) DeleteSeries(database string, sources []influxql.Source, condition influxql.Expr) error

DeleteSeries loops through the local shards and deletes the series data and metadata for the passed in series keys.

func (*Store) DeleteShard 

func (s *Store) DeleteShard(shardID uint64) error

DeleteShard removes a shard from disk.

func (*Store) DiskSize 

func (s *Store) DiskSize() (int64, error)

DiskSize returns the size of all the shard files in bytes. This size does not include the WAL size.

func (*Store) ExpandSources 

func (s *Store) ExpandSources(sources influxql.Sources) (influxql.Sources, error)

ExpandSources expands sources against all local shards.

func (*Store) Measurement 

func (s *Store) Measurement(database, name string) *Measurement

Measurement returns a measurement by name from the given database.

func (*Store) Measurements 

func (s *Store) Measurements(database string, cond influxql.Expr) ([]string, error)

Measurements returns a slice of sorted measurement names in the given database, matching the given condition.

func (*Store) Open 

func (s *Store) Open() error

Open initializes the store, creating all necessary directories, loading all shards and indexes and initializing periodic maintenance of all shards.

func (*Store) Path 

func (s *Store) Path() string

Path returns the store's root path.

func (*Store) RestoreShard 

func (s *Store) RestoreShard(id uint64, r io.Reader) error

RestoreShard restores a backup from r to a given shard. This will only overwrite files included in the backup.

func (*Store) SetShardEnabled 

func (s *Store) SetShardEnabled(shardID uint64, enabled bool) error

SetShardEnabled enables or disables a shard for read and writes.

func (*Store) Shard 

func (s *Store) Shard(id uint64) *Shard

Shard returns a shard by id.

func (*Store) ShardGroup 

func (s *Store) ShardGroup(ids []uint64) ShardGroup

ShardGroup returns a ShardGroup with a list of shards by id.

func (*Store) ShardIDs 

func (s *Store) ShardIDs() []uint64

ShardIDs returns a slice of all ShardIDs under management, in arbitrary order.

func (*Store) ShardN 

func (s *Store) ShardN() int

ShardN returns the number of shards in the store.

func (*Store) ShardRelativePath 

func (s *Store) ShardRelativePath(id uint64) (string, error)

ShardRelativePath will return the relative path to the shard. i.e. <database>/<retention>/<id>.

func (*Store) Shards 

func (s *Store) Shards(ids []uint64) []*Shard

Shards returns a list of shards by id.

func (*Store) Statistics 

func (s *Store) Statistics(tags map[string]string) []models.Statistic

Statistics returns statistics for period monitoring.

func (*Store) TagValues 

func (s *Store) TagValues(database string, cond influxql.Expr) ([]TagValues, error)

TagValues returns the tag keys and values in the given database, matching the condition.

func (*Store) WithLogger 

func (s *Store) WithLogger(log zap.Logger)

WithLogger sets the logger for the store.

func (*Store) WriteToShard 

func (s *Store) WriteToShard(shardID uint64, points []models.Point) error

WriteToShard writes a list of points to a shard identified by its ID.

type TagFilter 

type TagFilter struct {
	Op    influxql.Token
	Key   string
	Value string
	Regex *regexp.Regexp
}

TagFilter represents a tag filter when looking up other tags or measurements.

type TagValues 

type TagValues struct {
	Measurement string
	Values      []KeyValue
}

TagValues represents the tag keys and values in a measurement.

Source Files

View all Source files

Directories

Path Synopsis
Package engine can be imported to initialize and register all available TSDB engines.
 Package engine can be imported to initialize and register all available TSDB engines.
tsm1
Package tsm1 provides a TSDB in the Time Structured Merge tree format.
 Package tsm1 provides a TSDB in the Time Structured Merge tree format.
Package meta is a generated protocol buffer package.
 Package meta is a generated protocol buffer package.

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