chunk

package
v1.0.0 Latest Latest
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 Go to latest Published: Sep 8, 2019 License: Apache-2.0 Imports: 42 Imported by: 5

Documentation

Index

Constants

View Source 
const (
	ErrInvalidChecksum = errs.Error("invalid chunk checksum")
	ErrWrongMetadata   = errs.Error("wrong chunk metadata")
	ErrMetadataLength  = errs.Error("chunk metadata wrong length")
	ErrDataLength      = errs.Error("chunk data wrong length")
)

Errors that decode can return

Variables

View Source 
var BenchmarkLabels = labels.Labels{
	{Name: model.MetricNameLabel, Value: "container_cpu_usage_seconds_total"},
	{Name: "beta_kubernetes_io_arch", Value: "amd64"},
	{Name: "beta_kubernetes_io_instance_type", Value: "c3.somesize"},
	{Name: "beta_kubernetes_io_os", Value: "linux"},
	{Name: "container_name", Value: "some-name"},
	{Name: "cpu", Value: "cpu01"},
	{Name: "failure_domain_beta_kubernetes_io_region", Value: "somewhere-1"},
	{Name: "failure_domain_beta_kubernetes_io_zone", Value: "somewhere-1b"},
	{Name: "id", Value: "/kubepods/burstable/pod6e91c467-e4c5-11e7-ace3-0a97ed59c75e/a3c8498918bd6866349fed5a6f8c643b77c91836427fb6327913276ebc6bde28"},
	{Name: "image", Value: "registry/organisation/name@sha256:dca3d877a80008b45d71d7edc4fd2e44c0c8c8e7102ba5cbabec63a374d1d506"},
	{Name: "instance", Value: "ip-111-11-1-11.ec2.internal"},
	{Name: "job", Value: "kubernetes-cadvisor"},
	{Name: "kubernetes_io_hostname", Value: "ip-111-11-1-11"},
	{Name: "monitor", Value: "prod"},
	{Name: "name", Value: "k8s_some-name_some-other-name-5j8s8_kube-system_6e91c467-e4c5-11e7-ace3-0a97ed59c75e_0"},
	{Name: "namespace", Value: "kube-system"},
	{Name: "pod_name", Value: "some-other-name-5j8s8"},
}

BenchmarkLabels is a real example from Kubernetes' embedded cAdvisor metrics, lightly obfuscated

View Source 
var (

	// ErrNotSupported when a schema doesn't support that particular lookup.
	ErrNotSupported = errors.New("not supported")
)

Functions

func ChunksToMatrix 

func ChunksToMatrix(ctx context.Context, chunks []Chunk, from, through model.Time) (model.Matrix, error)

ChunksToMatrix converts a set of chunks to a model.Matrix.

func ExpectTables 

func ExpectTables(ctx context.Context, client TableClient, expected []TableDesc) error

ExpectTables compares existing tables to an expected set of tables. Exposed for testing,

Types

type AutoScalingConfig 

type AutoScalingConfig struct {
	Enabled     bool    `yaml:"enabled,omitempty"`
	RoleARN     string  `yaml:"role_arn,omitempty"`
	MinCapacity int64   `yaml:"min_capacity,omitempty"`
	MaxCapacity int64   `yaml:"max_capacity,omitempty"`
	OutCooldown int64   `yaml:"out_cooldown,omitempty"`
	InCooldown  int64   `yaml:"in_cooldown,omitempty"`
	TargetValue float64 `yaml:"target,omitempty"`
}

AutoScalingConfig for DynamoDB tables.

func (*AutoScalingConfig) RegisterFlags 

func (cfg *AutoScalingConfig) RegisterFlags(argPrefix string, f *flag.FlagSet)

RegisterFlags adds the flags required to config this to the given FlagSet.

type Bucket 

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

Bucket describes a range of time with a tableName and hashKey

type BucketClient 

type BucketClient interface {
	DeleteChunksBefore(ctx context.Context, ts time.Time) error
}

BucketClient is used to enforce retention on chunk buckets.

type CardinalityExceededError 

type CardinalityExceededError struct {
	MetricName, LabelName string
	Size, Limit           int32
}

CardinalityExceededError is returned when the user reads a row that is too large.

func (CardinalityExceededError) Error 

func (e CardinalityExceededError) Error() string

type Chunk 

type Chunk struct {
	// These two fields will be missing from older chunks (as will the hash).
	// On fetch we will initialise these fields from the DynamoDB key.
	Fingerprint model.Fingerprint `json:"fingerprint"`
	UserID      string            `json:"userID"`

	// These fields will be in all chunks, including old ones.
	From    model.Time    `json:"from"`
	Through model.Time    `json:"through"`
	Metric  labels.Labels `json:"metric"`

	// The hash is not written to the external storage either.  We use
	// crc32, Castagnoli table.  See http://www.evanjones.ca/crc32c.html.
	// For old chunks, ChecksumSet will be false.
	ChecksumSet bool   `json:"-"`
	Checksum    uint32 `json:"-"`

	// We never use Delta encoding (the zero value), so if this entry is
	// missing, we default to DoubleDelta.
	Encoding prom_chunk.Encoding `json:"encoding"`
	Data     prom_chunk.Chunk    `json:"-"`
	// contains filtered or unexported fields
}

Chunk contains encoded timeseries data

func NewChunk 

func NewChunk(userID string, fp model.Fingerprint, metric labels.Labels, c prom_chunk.Chunk, from, through model.Time) Chunk

NewChunk creates a new chunk

func ParseExternalKey 

func ParseExternalKey(userID, externalKey string) (Chunk, error)

ParseExternalKey is used to construct a partially-populated chunk from the key in DynamoDB. This chunk can then be used to calculate the key needed to fetch the Chunk data from Memcache/S3, and then fully populate the chunk with decode().

Pre-checksums, the keys written to DynamoDB looked like `<fingerprint>:<start time>:<end time>` (aka the ID), and the key for memcache and S3 was `<user id>/<fingerprint>:<start time>:<end time>. Finger prints and times were written in base-10.

Post-checksums, externals keys become the same across DynamoDB, Memcache and S3. Numbers become hex encoded. Keys look like: `<user id>/<fingerprint>:<start time>:<end time>:<checksum>`.

func (*Chunk) Decode 

func (c *Chunk) Decode(decodeContext *DecodeContext, input []byte) error

Decode the chunk from the given buffer, and confirm the chunk is the one we expected.

func (*Chunk) Encode 

func (c *Chunk) Encode() error

Encode writes the chunk into a buffer, and calculates the checksum.

func (*Chunk) Encoded 

func (c *Chunk) Encoded() ([]byte, error)

Encoded returns the buffer created by Encoded()

func (*Chunk) ExternalKey 

func (c *Chunk) ExternalKey() string

ExternalKey returns the key you can use to fetch this chunk from external storage. For newer chunks, this key includes a checksum.

func (*Chunk) Samples 

func (c *Chunk) Samples(from, through model.Time) ([]model.SamplePair, error)

Samples returns all SamplePairs for the chunk.

type CompositeStore 

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

CompositeStore is a Store which delegates to various stores depending on when they were activated.

func NewCompositeStore 

func NewCompositeStore() CompositeStore

NewCompositeStore creates a new Store which delegates to different stores depending on time.

func (*CompositeStore) AddPeriod 

func (c *CompositeStore) AddPeriod(storeCfg StoreConfig, cfg PeriodConfig, index IndexClient, chunks ObjectClient, limits *validation.Overrides) error

AddPeriod adds the configuration for a period of time to the CompositeStore

func (CompositeStore) Get 

func (c CompositeStore) Get(ctx context.Context, from, through model.Time, matchers ...*labels.Matcher) ([]Chunk, error)

func (CompositeStore) GetChunkRefs 

func (c CompositeStore) GetChunkRefs(ctx context.Context, from, through model.Time, matchers ...*labels.Matcher) ([][]Chunk, []*Fetcher, error)

func (CompositeStore) LabelValuesForMetricName 

func (c CompositeStore) LabelValuesForMetricName(ctx context.Context, from, through model.Time, metricName string, labelName string) ([]string, error)

LabelValuesForMetricName retrieves all label values for a single label name and metric name.

func (CompositeStore) Put 

func (c CompositeStore) Put(ctx context.Context, chunks []Chunk) error

func (CompositeStore) PutOne 

func (c CompositeStore) PutOne(ctx context.Context, from, through model.Time, chunk Chunk) error

func (CompositeStore) Stop 

func (c CompositeStore) Stop()

type DayTime 

type DayTime struct {
	model.Time
}

DayTime is a model.Time what holds day-aligned values, and marshals to/from YAML in YYYY-MM-DD format.

func (DayTime) MarshalYAML 

func (d DayTime) MarshalYAML() (interface{}, error)

MarshalYAML implements yaml.Marshaller.

func (*DayTime) UnmarshalYAML 

func (d *DayTime) UnmarshalYAML(unmarshal func(interface{}) error) error

UnmarshalYAML implements yaml.Unmarshaller.

type DecodeContext 

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

DecodeContext holds data that can be re-used between decodes of different chunks

func NewDecodeContext 

func NewDecodeContext() *DecodeContext

NewDecodeContext creates a new, blank, DecodeContext

type Fetcher 

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

Fetcher deals with fetching chunk contents from the cache/store, and writing back any misses to the cache. Also responsible for decoding chunks from the cache, in parallel.

func NewChunkFetcher 

func NewChunkFetcher(cfg cache.Config, storage ObjectClient) (*Fetcher, error)

NewChunkFetcher makes a new ChunkFetcher.

func (*Fetcher) FetchChunks 

func (c *Fetcher) FetchChunks(ctx context.Context, chunks []Chunk, keys []string) ([]Chunk, error)

FetchChunks fetchers a set of chunks from cache and store.

func (*Fetcher) Stop 

func (c *Fetcher) Stop()

Stop the ChunkFetcher.

type IndexClient 

type IndexClient interface {
	Stop()

	// For the write path.
	NewWriteBatch() WriteBatch
	BatchWrite(context.Context, WriteBatch) error

	// For the read path.
	QueryPages(ctx context.Context, queries []IndexQuery, callback func(IndexQuery, ReadBatch) (shouldContinue bool)) error
}

IndexClient is a client for the storage of the index (e.g. DynamoDB or Bigtable).

type IndexEntry 

type IndexEntry struct {
	TableName string
	HashValue string

	// For writes, RangeValue will always be set.
	RangeValue []byte

	// New for v6 schema, label value is not written as part of the range key.
	Value []byte
}

IndexEntry describes an entry in the chunk index

type IndexQuery 

type IndexQuery struct {
	TableName string
	HashValue string

	// One of RangeValuePrefix or RangeValueStart might be set:
	// - If RangeValuePrefix is not nil, must read all keys with that prefix.
	// - If RangeValueStart is not nil, must read all keys from there onwards.
	// - If neither is set, must read all keys for that row.
	RangeValuePrefix []byte
	RangeValueStart  []byte

	// Filters for querying
	ValueEqual []byte

	// If the result of this lookup is immutable or not (for caching).
	Immutable bool
}

IndexQuery describes a query for entries

type LegacySchemaConfig 

type LegacySchemaConfig struct {
	StorageClient string // aws, gcp, etc.

	// After midnight on this day, we start bucketing indexes by day instead of by
	// hour.  Only the day matters, not the time within the day.
	DailyBucketsFrom      flagext.DayValue
	Base64ValuesFrom      flagext.DayValue
	V4SchemaFrom          flagext.DayValue
	V5SchemaFrom          flagext.DayValue
	V6SchemaFrom          flagext.DayValue
	V9SchemaFrom          flagext.DayValue
	BigtableColumnKeyFrom flagext.DayValue

	// Config for the index & chunk tables.
	OriginalTableName string
	UsePeriodicTables bool
	IndexTablesFrom   flagext.DayValue
	IndexTables       PeriodicTableConfig
	ChunkTablesFrom   flagext.DayValue
	ChunkTables       PeriodicTableConfig
}

LegacySchemaConfig lets you configure schema via command-line flags

func (*LegacySchemaConfig) RegisterFlags 

func (cfg *LegacySchemaConfig) RegisterFlags(f *flag.FlagSet)

RegisterFlags adds the flags required to config this to the given FlagSet.

type MockStorage 

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

MockStorage is a fake in-memory StorageClient.

func NewMockStorage 

func NewMockStorage() *MockStorage

NewMockStorage creates a new MockStorage.

func (*MockStorage) BatchWrite 

func (m *MockStorage) BatchWrite(ctx context.Context, batch WriteBatch) error

BatchWrite implements StorageClient.

func (*MockStorage) CreateTable 

func (m *MockStorage) CreateTable(_ context.Context, desc TableDesc) error

CreateTable implements StorageClient.

func (*MockStorage) DeleteTable 

func (m *MockStorage) DeleteTable(_ context.Context, name string) error

DeleteTable implements StorageClient.

func (*MockStorage) DescribeTable 

func (m *MockStorage) DescribeTable(_ context.Context, name string) (desc TableDesc, isActive bool, err error)

DescribeTable implements StorageClient.

func (*MockStorage) GetChunks 

func (m *MockStorage) GetChunks(ctx context.Context, chunkSet []Chunk) ([]Chunk, error)

GetChunks implements StorageClient.

func (*MockStorage) ListTables 

func (m *MockStorage) ListTables(_ context.Context) ([]string, error)

ListTables implements StorageClient.

func (*MockStorage) NewWriteBatch 

func (m *MockStorage) NewWriteBatch() WriteBatch

NewWriteBatch implements StorageClient.

func (*MockStorage) PutChunks 

func (m *MockStorage) PutChunks(_ context.Context, chunks []Chunk) error

PutChunks implements StorageClient.

func (*MockStorage) QueryPages 

func (m *MockStorage) QueryPages(ctx context.Context, queries []IndexQuery, callback func(IndexQuery, ReadBatch) (shouldContinue bool)) error

QueryPages implements StorageClient.

func (*MockStorage) Stop 

func (*MockStorage) Stop()

Stop doesn't do anything.

func (*MockStorage) UpdateTable 

func (m *MockStorage) UpdateTable(_ context.Context, _, desc TableDesc) error

UpdateTable implements StorageClient.

type ObjectAndIndexClient 

type ObjectAndIndexClient interface {
	PutChunkAndIndex(ctx context.Context, c Chunk, index WriteBatch) error
}

ObjectAndIndexClient allows optimisations where the same client handles both

type ObjectClient 

type ObjectClient interface {
	Stop()

	PutChunks(ctx context.Context, chunks []Chunk) error
	GetChunks(ctx context.Context, chunks []Chunk) ([]Chunk, error)
}

ObjectClient is for storing and retrieving chunks.

type PeriodConfig 

type PeriodConfig struct {
	From        DayTime             `yaml:"from"`         // used when working with config
	IndexType   string              `yaml:"store"`        // type of index client to use.
	ObjectType  string              `yaml:"object_store"` // type of object client to use; if omitted, defaults to store.
	Schema      string              `yaml:"schema"`
	IndexTables PeriodicTableConfig `yaml:"index"`
	ChunkTables PeriodicTableConfig `yaml:"chunks,omitempty"`
	RowShards   uint32              `yaml:"row_shards"`
}

PeriodConfig defines the schema and tables to use for a period of time

type PeriodicTableConfig 

type PeriodicTableConfig struct {
	Prefix string        `yaml:"prefix"`
	Period time.Duration `yaml:"period,omitempty"`
	Tags   Tags          `yaml:"tags,omitempty"`
}

PeriodicTableConfig is configuration for a set of time-sharded tables.

func (*PeriodicTableConfig) RegisterFlags 

func (cfg *PeriodicTableConfig) RegisterFlags(argPrefix, tablePrefix string, f *flag.FlagSet)

RegisterFlags adds the flags required to config this to the given FlagSet.

func (*PeriodicTableConfig) TableFor 

func (cfg *PeriodicTableConfig) TableFor(t model.Time) string

TableFor calculates the table shard for a given point in time.

type ProvisionConfig 

type ProvisionConfig struct {
	ProvisionedThroughputOnDemandMode bool  `yaml:"provisioned_throughput_on_demand_mode"`
	ProvisionedWriteThroughput        int64 `yaml:"provisioned_write_throughput"`
	ProvisionedReadThroughput         int64 `yaml:"provisioned_read_throughput"`
	InactiveThroughputOnDemandMode    bool  `yaml:"inactive_throughput_on_demand_mode"`
	InactiveWriteThroughput           int64 `yaml:"inactive_write_throughput"`
	InactiveReadThroughput            int64 `yaml:"inactive_read_throughput"`

	WriteScale              AutoScalingConfig `yaml:"write_scale"`
	InactiveWriteScale      AutoScalingConfig `yaml:"inactive_write_scale"`
	InactiveWriteScaleLastN int64             `yaml:"inactive_write_scale_lastn"`
	ReadScale               AutoScalingConfig `yaml:"read_scale"`
	InactiveReadScale       AutoScalingConfig `yaml:"inactive_read_scale"`
	InactiveReadScaleLastN  int64             `yaml:"inactive_read_scale_lastn"`
}

ProvisionConfig holds config for provisioning capacity (on DynamoDB)

func (*ProvisionConfig) RegisterFlags 

func (cfg *ProvisionConfig) RegisterFlags(argPrefix string, f *flag.FlagSet)

RegisterFlags adds the flags required to config this to the given FlagSet.

type ReadBatch 

type ReadBatch interface {
	Iterator() ReadBatchIterator
}

ReadBatch represents the results of a QueryPages.

type ReadBatchIterator 

type ReadBatchIterator interface {
	Next() bool
	RangeValue() []byte
	Value() []byte
}

ReadBatchIterator is an iterator over a ReadBatch.

type Schema 

type Schema interface {
	// When doing a write, use this method to return the list of entries you should write to.
	GetWriteEntries(from, through model.Time, userID string, metricName string, labels labels.Labels, chunkID string) ([]IndexEntry, error)

	// Should only be used with the seriesStore. TODO: Make seriesStore implement a different interface altogether.
	// returns cache key string and []IndexEntry per bucket, matched in order
	GetCacheKeysAndLabelWriteEntries(from, through model.Time, userID string, metricName string, labels labels.Labels, chunkID string) ([]string, [][]IndexEntry, error)
	GetChunkWriteEntries(from, through model.Time, userID string, metricName string, labels labels.Labels, chunkID string) ([]IndexEntry, error)

	// When doing a read, use these methods to return the list of entries you should query
	GetReadQueriesForMetric(from, through model.Time, userID string, metricName string) ([]IndexQuery, error)
	GetReadQueriesForMetricLabel(from, through model.Time, userID string, metricName string, labelName string) ([]IndexQuery, error)
	GetReadQueriesForMetricLabelValue(from, through model.Time, userID string, metricName string, labelName string, labelValue string) ([]IndexQuery, error)

	// If the query resulted in series IDs, use this method to find chunks.
	GetChunksForSeries(from, through model.Time, userID string, seriesID []byte) ([]IndexQuery, error)
}

Schema interface defines methods to calculate the hash and range keys needed to write or read chunks from the external index.

type SchemaConfig 

type SchemaConfig struct {
	Configs []PeriodConfig `yaml:"configs"`
	// contains filtered or unexported fields
}

SchemaConfig contains the config for our chunk index schemas

func DefaultSchemaConfig 

func DefaultSchemaConfig(store, schema string, from model.Time) SchemaConfig

DefaultSchemaConfig creates a simple schema config for testing

func (SchemaConfig) ChunkTableFor 

func (cfg SchemaConfig) ChunkTableFor(t model.Time) (string, error)

ChunkTableFor calculates the chunk table shard for a given point in time.

func (*SchemaConfig) ForEachAfter 

func (cfg *SchemaConfig) ForEachAfter(t model.Time, f func(config *PeriodConfig))

ForEachAfter will call f() on every entry after t, splitting entries if necessary so there is an entry starting at t

func (*SchemaConfig) Load 

func (cfg *SchemaConfig) Load() error

Load the yaml file, or build the config from legacy command-line flags

func (SchemaConfig) PrintYaml 

func (cfg SchemaConfig) PrintYaml()

PrintYaml dumps the yaml to stdout, to aid in migration

func (*SchemaConfig) RegisterFlags 

func (cfg *SchemaConfig) RegisterFlags(f *flag.FlagSet)

RegisterFlags adds the flags required to config this to the given FlagSet.

type Store 

type Store interface {
	Put(ctx context.Context, chunks []Chunk) error
	PutOne(ctx context.Context, from, through model.Time, chunk Chunk) error
	Get(ctx context.Context, from, through model.Time, matchers ...*labels.Matcher) ([]Chunk, error)
	// GetChunkRefs returns the un-loaded chunks and the fetchers to be used to load them. You can load each slice of chunks ([]Chunk),
	// using the corresponding Fetcher (fetchers[i].FetchChunks(ctx, chunks[i], ...)
	GetChunkRefs(ctx context.Context, from, through model.Time, matchers ...*labels.Matcher) ([][]Chunk, []*Fetcher, error)
	LabelValuesForMetricName(ctx context.Context, from, through model.Time, metricName string, labelName string) ([]string, error)
	Stop()
}

Store for chunks.

type StoreConfig 

type StoreConfig struct {
	ChunkCacheConfig       cache.Config `yaml:"chunk_cache_config,omitempty"`
	WriteDedupeCacheConfig cache.Config `yaml:"write_dedupe_cache_config,omitempty"`

	MinChunkAge           time.Duration `yaml:"min_chunk_age,omitempty"`
	CacheLookupsOlderThan time.Duration `yaml:"cache_lookups_older_than,omitempty"`

	// Limits query start time to be greater than now() - MaxLookBackPeriod, if set.
	MaxLookBackPeriod time.Duration `yaml:"max_look_back_period"`
}

StoreConfig specifies config for a ChunkStore

func (*StoreConfig) RegisterFlags 

func (cfg *StoreConfig) RegisterFlags(f *flag.FlagSet)

RegisterFlags adds the flags required to config this to the given FlagSet

type TableClient 

type TableClient interface {
	ListTables(ctx context.Context) ([]string, error)
	CreateTable(ctx context.Context, desc TableDesc) error
	DeleteTable(ctx context.Context, name string) error
	DescribeTable(ctx context.Context, name string) (desc TableDesc, isActive bool, err error)
	UpdateTable(ctx context.Context, current, expected TableDesc) error
}

TableClient is a client for telling Dynamo what to do with tables.

type TableDesc 

type TableDesc struct {
	Name              string
	UseOnDemandIOMode bool
	ProvisionedRead   int64
	ProvisionedWrite  int64
	Tags              Tags
	WriteScale        AutoScalingConfig
	ReadScale         AutoScalingConfig
}

TableDesc describes a table.

func (TableDesc) Equals 

func (desc TableDesc) Equals(other TableDesc) bool

Equals returns true if other matches desc.

type TableManager 

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

TableManager creates and manages the provisioned throughput on DynamoDB tables

func NewTableManager 

func NewTableManager(cfg TableManagerConfig, schemaCfg SchemaConfig, maxChunkAge time.Duration, tableClient TableClient,
	objectClient BucketClient) (*TableManager, error)

NewTableManager makes a new TableManager

func (*TableManager) Start 

func (m *TableManager) Start()

Start the TableManager

func (*TableManager) Stop 

func (m *TableManager) Stop()

Stop the TableManager

func (*TableManager) SyncTables 

func (m *TableManager) SyncTables(ctx context.Context) error

SyncTables will calculate the tables expected to exist, create those that do not and update those that need it. It is exposed for testing.

type TableManagerConfig 

type TableManagerConfig struct {
	// Master 'off-switch' for table capacity updates, e.g. when troubleshooting
	ThroughputUpdatesDisabled bool `yaml:"throughput_updates_disabled"`

	// Master 'on-switch' for table retention deletions
	RetentionDeletesEnabled bool `yaml:"retention_deletes_enabled"`

	// How far back tables will be kept before they are deleted
	RetentionPeriod time.Duration `yaml:"retention_period"`

	// Period with which the table manager will poll for tables.
	DynamoDBPollInterval time.Duration `yaml:"dynamodb_poll_interval"`

	// duration a table will be created before it is needed.
	CreationGracePeriod time.Duration `yaml:"creation_grace_period"`

	IndexTables ProvisionConfig `yaml:"index_tables_provisioning"`
	ChunkTables ProvisionConfig `yaml:"chunk_tables_provisioning"`
}

TableManagerConfig holds config for a TableManager

func (*TableManagerConfig) RegisterFlags 

func (cfg *TableManagerConfig) RegisterFlags(f *flag.FlagSet)

RegisterFlags adds the flags required to config this to the given FlagSet.

type Tags 

type Tags map[string]string

Tags is a string-string map that implements flag.Value.

func (Tags) Equals 

func (ts Tags) Equals(other Tags) bool

Equals returns true is other matches ts.

func (*Tags) Set 

func (ts *Tags) Set(s string) error

Set implements flag.Value

func (Tags) String 

func (ts Tags) String() string

String implements flag.Value

func (*Tags) UnmarshalYAML 

func (ts *Tags) UnmarshalYAML(unmarshal func(interface{}) error) error

UnmarshalYAML implements yaml.Unmarshaler.

type WriteBatch 

type WriteBatch interface {
	Add(tableName, hashValue string, rangeValue []byte, value []byte)
}

WriteBatch represents a batch of writes.

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