Package org.apache.druid.server.coordination

Class ServerManager

java.lang.Object

org.apache.druid.server.coordination.ServerManager

All Implemented Interfaces:

QuerySegmentWalker

public class ServerManager
extends Object
implements QuerySegmentWalker

Query handler for Historical processes (see CliHistorical).

In tests, this class's behavior is partially mimicked by TestClusterQuerySegmentWalker.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
final class	ServerManager.ResourceManagingQueryRunner<T>	QueryRunner that on run builds a set of QueryRunner for a set of SegmentDescriptor and merges them using the QueryToolChest.
static final class	ServerManager.SegmentReference	Wrapper for a SegmentDescriptor and Optional<Segment>, the latter being created by a SegmentMapFunction being applied to a ReferenceCountedSegmentProvider.

Constructor Summary

Constructors

Constructor	Description
ServerManager(QueryRunnerFactoryConglomerate conglomerate, ServiceEmitter emitter, QueryProcessingPool queryProcessingPool, CachePopulator cachePopulator, com.fasterxml.jackson.databind.ObjectMapper objectMapper, Cache cache, CacheConfig cacheConfig, SegmentManager segmentManager, ServerConfig serverConfig, PolicyEnforcer policyEnforcer)

Method Summary

Modifier and Type	Method	Description
protected List<ServerManager.SegmentReference>	acquireAllSegments(VersionedIntervalTimeline<String,ReferenceCountedSegmentProvider> timeline, Iterable<SegmentDescriptor> segments, SegmentMapFunction segmentMapFn, Closer closer)	For each SegmentDescriptor, we try to fetch a ReferenceCountedSegmentProvider from the supplied VersionedIntervalTimeline and apply SegmentMapFunction to acquire a reference and transform the segment as appropriate for query processing, returning a ServerManager.SegmentReference wrapper.
protected <T> QueryRunner<T>	buildQueryRunnerForSegment(SegmentDescriptor segmentDescriptor, Segment segment, QueryRunnerFactory<T,Query<T>> factory, QueryToolChest<T,Query<T>> toolChest, AtomicLong cpuTimeAccumulator, Optional<byte[]> cacheKeyPrefix)
<T> QueryRunner<T>	getQueryRunnerForIntervals(Query<T> query, Iterable<org.joda.time.Interval> intervals)
<T> QueryRunner<T>	getQueryRunnerForSegments(Query<T> query, Iterable<SegmentDescriptor> specs)
protected <T> FunctionalIterable<QueryRunner<T>>	getQueryRunnersForSegments(VersionedIntervalTimeline<String,ReferenceCountedSegmentProvider> timeline, Iterable<SegmentDescriptor> specs, Query<T> query, QueryRunnerFactory<T,Query<T>> factory, QueryToolChest<T,Query<T>> toolChest, SegmentMapFunction segmentMapFn, AtomicLong cpuTimeAccumulator, Optional<byte[]> cacheKeyPrefix, Closer closer)

Methods inherited from class java.lang.Object

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

Constructor Details

ServerManager

@Inject
public ServerManager(QueryRunnerFactoryConglomerate conglomerate,
 ServiceEmitter emitter,
 QueryProcessingPool queryProcessingPool,
 CachePopulator cachePopulator,
 com.fasterxml.jackson.databind.ObjectMapper objectMapper,
 Cache cache,
 CacheConfig cacheConfig,
 SegmentManager segmentManager,
 ServerConfig serverConfig,
 PolicyEnforcer policyEnforcer)

Method Details

getQueryRunnerForIntervals

public <T> QueryRunner<T> getQueryRunnerForIntervals(Query<T> query,
 Iterable<org.joda.time.Interval> intervals)

Specified by:

getQueryRunnerForIntervals in interface QuerySegmentWalker

getQueryRunnerForSegments

public <T> QueryRunner<T> getQueryRunnerForSegments(Query<T> query,
 Iterable<SegmentDescriptor> specs)

Specified by:

getQueryRunnerForSegments in interface QuerySegmentWalker

acquireAllSegments

protected List<ServerManager.SegmentReference> acquireAllSegments(VersionedIntervalTimeline<String,ReferenceCountedSegmentProvider> timeline,
 Iterable<SegmentDescriptor> segments,
 SegmentMapFunction segmentMapFn,
 Closer closer)

For each SegmentDescriptor, we try to fetch a ReferenceCountedSegmentProvider from the supplied VersionedIntervalTimeline and apply SegmentMapFunction to acquire a reference and transform the segment as appropriate for query processing, returning a ServerManager.SegmentReference wrapper. The wrapper contains the SegmentDescriptor and an Optional<Segment>, which if present the Segment will be registered to the Closer, and will be empty if the segment was not actually in the timeline, or if unable to apply the reference

getQueryRunnersForSegments

protected <T> FunctionalIterable<QueryRunner<T>> getQueryRunnersForSegments(VersionedIntervalTimeline<String,ReferenceCountedSegmentProvider> timeline,
 Iterable<SegmentDescriptor> specs,
 Query<T> query,
 QueryRunnerFactory<T,Query<T>> factory,
 QueryToolChest<T,Query<T>> toolChest,
 SegmentMapFunction segmentMapFn,
 AtomicLong cpuTimeAccumulator,
 Optional<byte[]> cacheKeyPrefix,
 Closer closer)

buildQueryRunnerForSegment

protected <T> QueryRunner<T> buildQueryRunnerForSegment(SegmentDescriptor segmentDescriptor,
 Segment segment,
 QueryRunnerFactory<T,Query<T>> factory,
 QueryToolChest<T,Query<T>> toolChest,
 AtomicLong cpuTimeAccumulator,
 Optional<byte[]> cacheKeyPrefix)