org.apache.druid.query.groupby.epinephelinae

Class GroupByMergingQueryRunnerV2

java.lang.Object

org.apache.druid.query.groupby.epinephelinae.GroupByMergingQueryRunnerV2

All Implemented Interfaces:

QueryRunner<ResultRow>

public class GroupByMergingQueryRunnerV2
extends Object
implements QueryRunner<ResultRow>

Class that knows how to merge a collection of groupBy QueryRunner objects, called queryables, using a buffer provided by mergeBufferPool and a parallel executor provided by exec. Outputs a fully aggregated stream of ResultRow objects. Does not apply post-aggregators. The input queryables are expected to come from a GroupByQueryEngineV2. This code runs on data servers, like Historicals. This class has some resemblance to GroupByRowProcessor. See the javadoc of that class for a discussion of similarities and differences. Used by GroupByStrategyV2.mergeRunners(ListeningExecutorService, Iterable).

Constructor Summary

Constructors

Constructor and Description
GroupByMergingQueryRunnerV2(GroupByQueryConfig config, ExecutorService exec, QueryWatcher queryWatcher, Iterable<QueryRunner<ResultRow>> queryables, int concurrencyHint, BlockingPool<ByteBuffer> mergeBufferPool, int mergeBufferSize, com.fasterxml.jackson.databind.ObjectMapper spillMapper, String processingTmpDir)

Method Summary

Modifier and Type	Method and Description
Sequence<ResultRow>	run(QueryPlus<ResultRow> queryPlus, ResponseContext responseContext) Runs the given query and returns results in a time-ordered sequence.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.druid.query.QueryRunner

run

Constructor Detail

GroupByMergingQueryRunnerV2

public GroupByMergingQueryRunnerV2(GroupByQueryConfig config,
                                   ExecutorService exec,
                                   QueryWatcher queryWatcher,
                                   Iterable<QueryRunner<ResultRow>> queryables,
                                   int concurrencyHint,
                                   BlockingPool<ByteBuffer> mergeBufferPool,
                                   int mergeBufferSize,
                                   com.fasterxml.jackson.databind.ObjectMapper spillMapper,
                                   String processingTmpDir)

Method Detail

run

public Sequence<ResultRow> run(QueryPlus<ResultRow> queryPlus,
                               ResponseContext responseContext)

Description copied from interface: QueryRunner

Runs the given query and returns results in a time-ordered sequence.

Specified by:

run in interface QueryRunner<ResultRow>