Package org.apache.druid.server

Class ClientQuerySegmentWalker

java.lang.Object

org.apache.druid.server.ClientQuerySegmentWalker

All Implemented Interfaces:

QuerySegmentWalker

public class ClientQuerySegmentWalker
extends Object
implements QuerySegmentWalker

Query handler for the Broker processes (see CliBroker).

This class is responsible for:

1) Running queries on the cluster using its 'clusterClient' 2) Running queries locally (when all datasources are global) using its 'localClient' 3) Inlining subqueries if necessary, in service of the above two goals

Field Summary

Fields

Modifier and Type	Field	Description
static final String	BYTES_COUNT_METRIC
static final String	ROWS_COUNT_METRIC

Constructor Summary

Constructors

Constructor

Description

ClientQuerySegmentWalker(ServiceEmitter emitter, QuerySegmentWalker clusterClient, QuerySegmentWalker localClient, QueryRunnerFactoryConglomerate conglomerate, JoinableFactory joinableFactory, RetryQueryRunnerConfig retryConfig, com.fasterxml.jackson.databind.ObjectMapper objectMapper, ServerConfig serverConfig, Cache cache, CacheConfig cacheConfig, SubqueryGuardrailHelper subqueryGuardrailHelper, SubqueryCountStatsProvider subqueryStatsProvider, GenericQueryMetricsFactory genericQueryMetricsFactory)

Method Summary

Modifier and Type	Method	Description
static DataSource	generateSubqueryIds(DataSource rootDataSource, String parentQueryId, String parentSqlQueryId, String parentQueryResourceId)	This method returns the datasource by populating all the QueryDataSource with correct nesting level and sibling order of all the subqueries that are present.
<T> QueryRunner<T>	getQueryRunnerForIntervals(Query<T> query, Iterable<org.joda.time.Interval> intervals)
<T> QueryRunner<T>	getQueryRunnerForSegments(Query<T> query, Iterable<SegmentDescriptor> specs)

Methods inherited from class java.lang.Object

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

Field Details

ROWS_COUNT_METRIC

public static final String ROWS_COUNT_METRIC

See Also:

• Constant Field Values

BYTES_COUNT_METRIC

public static final String BYTES_COUNT_METRIC

See Also:

• Constant Field Values

Constructor Details

ClientQuerySegmentWalker

public ClientQuerySegmentWalker(ServiceEmitter emitter,
 QuerySegmentWalker clusterClient,
 QuerySegmentWalker localClient,
 QueryRunnerFactoryConglomerate conglomerate,
 JoinableFactory joinableFactory,
 RetryQueryRunnerConfig retryConfig,
 com.fasterxml.jackson.databind.ObjectMapper objectMapper,
 ServerConfig serverConfig,
 Cache cache,
 CacheConfig cacheConfig,
 SubqueryGuardrailHelper subqueryGuardrailHelper,
 SubqueryCountStatsProvider subqueryStatsProvider,
 GenericQueryMetricsFactory genericQueryMetricsFactory)

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

generateSubqueryIds

public static DataSource generateSubqueryIds(DataSource rootDataSource,
 @Nullable
 String parentQueryId,
 @Nullable
 String parentSqlQueryId,
 String parentQueryResourceId)

This method returns the datasource by populating all the QueryDataSource with correct nesting level and sibling order of all the subqueries that are present. It also plumbs parent query's id and sql id in case the subqueries don't have it set by default

Parameters:

rootDataSource - Datasource whose subqueries need to be populated

parentQueryId - Parent Query's ID, can be null if it does not need to update this in the subqueries

parentSqlQueryId - Parent Query's SQL Query ID, can be null if it does not need to update this in the subqueries

parentQueryResourceId - Parent Query's Query Resource ID

Returns:

DataSource populated with the subqueries