tsdb

package
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 Go to latest Published: Jun 26, 2015 License: MIT Imports: 26 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

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

# measurment 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. (e.g. 1, 345, 2015, -10)
  • float - Numeric values that include a decimal. (e.g. 1.0, -3.14, 6.0+e5). Note that all values must have a decimal even if the decimal value is zero (1 is an integer, 1.0 is a float).
  • 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, it must be escaped with a backslash, e.g. \".
# integer value
cpu value=1

# float value
cpu_load value=1.2

# boolean value
error fatal=true

# string value
event msg="logged out"

# multiple values
cpu load=10.0,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=1.0 1434055562000000000
cpu,host=server02,region=uswest value=3.0 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=1.0,msg="all systems nominal"
cpu,host=server\ 01,region=us\,west value_int=1

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.

Documentation

Overview

Package tsdb implements a durable time series database.

Index

Constants

View Source 
const (
	// DefaultRetentionAutoCreate is the default for auto-creating retention policies
	DefaultRetentionAutoCreate = true

	// DefaultRetentionCheckEnabled is the default for checking for retention policy enforcement
	DefaultRetentionCheckEnabled = true

	// DefaultRetentionCreatePeriod represents how often the server will check to see if new
	// shard groups need to be created in advance for writing
	DefaultRetentionCreatePeriod = 45 * time.Minute

	// DefaultRetentionCheckPeriod is the period of time between retention policy checks are run
	DefaultRetentionCheckPeriod = 10 * time.Minute

	// DefaultMaxWALSize is the default size of the WAL before it is flushed.
	DefaultMaxWALSize = 100 * 1024 * 1024 // 100MB

	// DefaultWALFlushInterval is the frequency the WAL will get flushed if
	// it doesn't reach its size threshold.
	DefaultWALFlushInterval = 10 * time.Minute
)
View Source 
const WALPartitionN = 8

WALPartitionN is the number of partitions in the write ahead log.

Variables

View Source 
var (
	// ErrInvalidQuery is returned when executing an unknown query type.
	ErrInvalidQuery = errors.New("invalid query")

	// ErrNotExecuted is returned when a statement is not executed in a query.
	// This can occur when a previous statement in the same query has errored.
	ErrNotExecuted = errors.New("not executed")
)
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")

	// ErrWALPartitionNotFound is returns when flushing a WAL partition that
	// does not exist.
	ErrWALPartitionNotFound = errors.New("wal partition not found")
)
View Source 
var (
	ErrShardNotFound = fmt.Errorf("shard not found")
)

Functions

func ErrDatabaseNotFound 

func ErrDatabaseNotFound(name string) error

func ErrMeasurementNotFound 

func ErrMeasurementNotFound(name string) error

func IsRetryable 

func IsRetryable(err error) bool

IsRetryable returns true if this error is temporary and could be retried

func NewSnapshotWriter 

func NewSnapshotWriter(meta []byte, store *Store) (*snapshot.Writer, error)

NewSnapshotWriter returns a new snapshot.Writer that will write metadata and the store's shards to an archive.

func NopWriteToCloser 

func NopWriteToCloser(w io.WriterTo) interface {
	io.WriterTo
	io.Closer
}

NopWriteToCloser returns an io.WriterTo that implements io.Closer.

func WALPartition 

func WALPartition(key []byte) uint8

WALPartition returns the partition number that key belongs to.

Types

type Config 

type Config struct {
	Dir                   string        `toml:"dir"`
	MaxWALSize            int           `toml:"max-wal-size"`
	WALFlushInterval      toml.Duration `toml:"wal-flush-interval"`
	RetentionAutoCreate   bool          `toml:"retention-auto-create"`
	RetentionCheckEnabled bool          `toml:"retention-check-enabled"`
	RetentionCheckPeriod  toml.Duration `toml:"retention-check-period"`
	RetentionCreatePeriod toml.Duration `toml:"retention-create-period"`
}

func NewConfig 

func NewConfig() Config

func (*Config) ShardGroupPreCreateCheckPeriod 

func (c *Config) ShardGroupPreCreateCheckPeriod() time.Duration

ShardGroupPreCreateCheckPeriod returns the check interval to pre-create shard groups. If it was not defined in the config, it defaults to DefaultShardGroupPreCreatePeriod

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() *DatabaseIndex

func (*DatabaseIndex) DropMeasurement 

func (db *DatabaseIndex) DropMeasurement(name string)

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

func (*DatabaseIndex) DropSeries 

func (db *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 (db *DatabaseIndex) Measurements() Measurements

Measurements returns a list of all measurements.

type ErrAuthorize 

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

ErrAuthorize represents an authorization error.

func (ErrAuthorize) Error 

func (e ErrAuthorize) Error() string

Error returns the text of the error.

type FieldCodec 

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

FieldCodec providecs encoding and decoding functionality for the fields of a given Measurement. It is a distinct type to avoid locking writes on this node while potentially long-running queries are executing.

It is not affected by changes to the Measurement object after codec creation. TODO: this shouldn't be exported. nothing outside the shard should know about field encodings. 

However, this is here until tx.go and the engine get refactored into tsdb.

func (*FieldCodec) DecodeByID 

func (f *FieldCodec) DecodeByID(targetID uint8, b []byte) (interface{}, error)

DecodeByID scans a byte slice for a field with the given ID, converts it to its expected type, and return that value. TODO: shouldn't be exported. refactor engine

func (*FieldCodec) DecodeFields 

func (f *FieldCodec) DecodeFields(b []byte) (map[uint8]interface{}, error)

DecodeFields decodes a byte slice into a set of field ids and values.

func (*FieldCodec) DecodeFieldsWithNames 

func (f *FieldCodec) DecodeFieldsWithNames(b []byte) (map[string]interface{}, error)

DecodeFieldsWithNames decodes a byte slice into a set of field names and values TODO: shouldn't be exported. refactor engine

func (*FieldCodec) EncodeFields 

func (f *FieldCodec) EncodeFields(values map[string]interface{}) ([]byte, error)

EncodeFields converts a map of values with string keys to a byte slice of field IDs and values.

If a field exists in the codec, but its type is different, an error is returned. If a field is not present in the codec, the system panics.

func (*FieldCodec) FieldIDByName 

func (f *FieldCodec) FieldIDByName(s string) (uint8, error)

TODO: this shouldn't be exported. remove when tx.go and engine.go get refactored into tsdb

type Fields 

type Fields map[string]interface{}

func (Fields) MarshalBinary 

func (p Fields) MarshalBinary() []byte

type LocalMapper 

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

LocalMapper implements the influxql.Mapper interface for running map tasks over a shard that is local to this server

func (*LocalMapper) Begin 

func (l *LocalMapper) Begin(c *influxql.Call, startingTime int64, chunkSize int) error

Begin will set up the mapper to run the map function for a given aggregate call starting at the passed in time

func (*LocalMapper) Close 

func (l *LocalMapper) Close()

Close closes the LocalMapper.

func (*LocalMapper) IsEmpty 

func (l *LocalMapper) IsEmpty(tmax int64) bool

IsEmpty returns true if either all cursors are nil or all cursors are past the passed in max time

func (*LocalMapper) Next 

func (l *LocalMapper) Next() (seriesKey string, timestamp int64, value interface{})

Next returns the next matching timestamped value for the LocalMapper.

func (*LocalMapper) NextInterval 

func (l *LocalMapper) NextInterval() (interface{}, error)

NextInterval will get the time ordered next interval of the given interval size from the mapper. This is a forward only operation from the start time passed into Begin. Will return nil when there is no more data to be read. If this is a raw query, interval should be the max time to hit in the query

func (*LocalMapper) Open 

func (l *LocalMapper) Open() error

Open opens the LocalMapper.

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, idx *DatabaseIndex) *Measurement

NewMeasurement allocates and initializes a new Measurement.

func (*Measurement) AddSeries 

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

AddSeries will add a series to the measurementIndex. Returns false if already present

func (*Measurement) DropSeries 

func (m *Measurement) DropSeries(seriesID uint64)

DropSeries will remove a series from the measurementIndex.

func (*Measurement) FieldNames 

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

FieldNames returns a list of the measurement's field names

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) SeriesKeys 

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

SeriesKeys returns the keys of every series in this measurement

func (*Measurement) TagKeys 

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

TagKeys returns a list of the measurement's tag names.

func (*Measurement) TagSets 

func (m *Measurement) TagSets(stmt *influxql.SelectStatement, dimensions []string) ([]*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"}, etc... 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.

type Measurements 

type Measurements []*Measurement

Measurements represents a list of *Measurement.

func (Measurements) Len 

func (a Measurements) Len() int

func (Measurements) Less 

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

func (Measurements) Swap 

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

type Monitor 

type Monitor struct {
	Store interface{}
}

Monitor represents a TSDB monitoring service.

func (*Monitor) Close 

func (m *Monitor) Close() error

func (*Monitor) Open 

func (m *Monitor) Open() error

type Point 

type Point interface {
	Name() string
	SetName(string)

	Tags() Tags
	AddTag(key, value string)
	SetTags(tags Tags)

	Fields() Fields
	AddField(name string, value interface{})

	Time() time.Time
	SetTime(t time.Time)
	UnixNano() int64

	HashID() uint64
	Key() []byte

	Data() []byte
	SetData(buf []byte)

	String() string
}

Point defines the values that will be written to the database

func NewPoint 

func NewPoint(name string, tags Tags, fields Fields, time time.Time) Point

NewPoint returns a new point with the given measurement name, tags, fiels and timestamp

func ParsePoints 

func ParsePoints(buf []byte) ([]Point, error)

ParsePoints returns a slice of Points from a text representation of a point with each point separated by newlines.

func ParsePointsString 

func ParsePointsString(buf string) ([]Point, error)

func ParsePointsWithPrecision 

func ParsePointsWithPrecision(buf []byte, defaultTime time.Time, precision string) ([]Point, error)

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, d time.Duration) *PointBatcher

NewPointBatcher returns a new PointBatcher.

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<- Point

In returns the channel to which points should be written.

func (*PointBatcher) Out 

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

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 QueryExecutor 

type QueryExecutor struct {
	// The meta store for accessing and updating cluster and schema data.
	MetaStore interface {
		Database(name string) (*meta.DatabaseInfo, error)
		Databases() ([]meta.DatabaseInfo, error)
		User(name string) (*meta.UserInfo, error)
		AdminUserExists() (bool, error)
		Authenticate(username, password string) (*meta.UserInfo, error)
		RetentionPolicy(database, name string) (rpi *meta.RetentionPolicyInfo, err error)
		UserCount() (int, error)
	}

	// Executes statements relating to meta data.
	MetaStatementExecutor interface {
		ExecuteStatement(stmt influxql.Statement) *influxql.Result
	}

	Logger *log.Logger
	// contains filtered or unexported fields
}

QueryExecutor executes every statement in an influxdb Query. It is responsible for coordinating between the local tsdb.Store, the meta.Store, and the other nodes in the cluster to run the query against their local tsdb.Stores. There should be one executor in a running process

func NewQueryExecutor 

func NewQueryExecutor(store *Store) *QueryExecutor

NewQueryExecutor returns an initialized QueryExecutor

func (*QueryExecutor) Authorize 

func (q *QueryExecutor) Authorize(u *meta.UserInfo, query *influxql.Query, database string) error

Authorize user u to execute query q on database. database can be "" for queries that do not require a database. If no user is provided it will return an error unless the query's first statement is to create a root user.

func (*QueryExecutor) Begin 

func (q *QueryExecutor) Begin() (influxql.Tx, error)

Begin is for influxql/engine.go to use to get a transaction object to start the query

func (*QueryExecutor) ExecuteQuery 

func (q *QueryExecutor) ExecuteQuery(query *influxql.Query, database string, chunkSize int) (<-chan *influxql.Result, error)

ExecuteQuery executes an InfluxQL query against the server. It sends results down the passed in chan and closes it when done. It will close the chan on the first statement that throws an error.

type Series 

type Series struct {
	Key  string
	Tags map[string]string
	// contains filtered or unexported fields
}

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

func (*Series) MarshalBinary 

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

MarshalBinary encodes the object to a binary format.

func (*Series) UnmarshalBinary 

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

UnmarshalBinary decodes the object from a binary format.

type Shard 

type Shard struct {

	// The maximum size and time thresholds for flushing the WAL.
	MaxWALSize       int
	WALFlushInterval time.Duration

	// The writer used by the logger.
	LogOutput io.Writer
	// 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(index *DatabaseIndex, path string) *Shard

NewShard returns a new initialized Shard

func (*Shard) Close 

func (s *Shard) Close() error

Close shuts down the shard's store.

func (*Shard) DB 

func (s *Shard) DB() *bolt.DB

TODO: this is temporarily exported to make tx.go work. When the query engine gets refactored into the tsdb package this should be removed. No one outside tsdb should know the underlying store.

func (*Shard) FieldCodec 

func (s *Shard) FieldCodec(measurementName string) *FieldCodec

TODO: this is temporarily exported to make tx.go work. When the query engine gets refactored into the tsdb package this should be removed. No one outside tsdb should know the underlying field encoding scheme.

func (*Shard) Flush 

func (s *Shard) Flush() error

Flush writes all points from the write ahead log to the index.

func (*Shard) FlushPartition 

func (s *Shard) FlushPartition(partitionID uint8) error

FlushPartition flushes a single WAL partition.

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) SeriesCount 

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

SeriesCount returns the number of series buckets on the shard. This does not include a count from the WAL.

func (*Shard) ValidateAggregateFieldsInStatement 

func (s *Shard) ValidateAggregateFieldsInStatement(measurementName string, stmt *influxql.SelectStatement) error

func (*Shard) WritePoints 

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

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

type Store 

type Store struct {
	MaxWALSize       int
	WALFlushInterval time.Duration

	Logger *log.Logger
	// contains filtered or unexported fields
}

func NewStore 

func NewStore(path string) *Store

func (*Store) Close 

func (s *Store) Close() error

func (*Store) CreateShard 

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

func (*Store) DatabaseIndex 

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

func (*Store) DeleteDatabase 

func (s *Store) DeleteDatabase(name string, shardIDs []uint64) error

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

func (*Store) DeleteShard 

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

DeleteShard removes a shard from disk.

func (*Store) Flush 

func (s *Store) Flush() error

Flush forces all shards to write their WAL data to the index.

func (*Store) Measurement 

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

func (*Store) Open 

func (s *Store) Open() error

func (*Store) Path 

func (s *Store) Path() string

Path returns the store's root path.

func (*Store) Shard 

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

func (*Store) ShardIDs 

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

ShardIDs returns a slice of all ShardIDs under management.

func (*Store) ValidateAggregateFieldsInStatement 

func (s *Store) ValidateAggregateFieldsInStatement(shardID uint64, measurementName string, stmt *influxql.SelectStatement) error

func (*Store) WriteToShard 

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

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 Tags 

type Tags map[string]string

Source Files

View all Source files

Directories

Path Synopsis
Package internal is a generated protocol buffer package.
 Package internal is a generated protocol buffer package.

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