util

Documentation

Index

• Variables
• func DoParallelQueries(ctx context.Context, doSingleQuery DoSingleQuery, queries []chunk.IndexQuery, ...) error
• func EnsureDirectory(dir string) error
• func GetParallelChunks(ctx context.Context, chunks []chunk.Chunk, ...) ([]chunk.Chunk, error)
• type Callback
  • func QueryFilter(callback Callback) Callback
• type DoSingleQuery

Variables

var QueryParallelism = 100

QueryParallelism is the maximum number of subqueries run in parallel per higher-level query

Functions

func DoParallelQueries

func DoParallelQueries(
	ctx context.Context, doSingleQuery DoSingleQuery, queries []chunk.IndexQuery,
	callback func(chunk.IndexQuery, chunk.ReadBatch) bool,
) error

DoParallelQueries translates between our interface for query batching, and indexes that don't yet support batching.

func EnsureDirectory

func EnsureDirectory(dir string) error

EnsureDirectory makes sure directory is there, if not creates it if not

func GetParallelChunks

func GetParallelChunks(ctx context.Context, chunks []chunk.Chunk, f func(context.Context, *chunk.DecodeContext, chunk.Chunk) (chunk.Chunk, error)) ([]chunk.Chunk, error)

GetParallelChunks fetches chunks in parallel (up to maxParallel).

Types

type Callback

type Callback func(chunk.IndexQuery, chunk.ReadBatch) bool

Callback from an IndexQuery.

func QueryFilter

func QueryFilter(callback Callback) Callback

QueryFilter wraps a callback to ensure the results are filtered correctly; useful for the cache and Bigtable backend, which only ever fetches the whole row.

type DoSingleQuery

type DoSingleQuery func(
	ctx context.Context, query chunk.IndexQuery,
	callback func(chunk.ReadBatch) bool,
) error

DoSingleQuery is the interface for indexes that don't support batching yet.