org.apache.hadoop.hive.ql.optimizer.physical

Class CommonJoinTaskDispatcher

java.lang.Object

org.apache.hadoop.hive.ql.optimizer.physical.AbstractJoinTaskDispatcher

org.apache.hadoop.hive.ql.optimizer.physical.CommonJoinTaskDispatcher

All Implemented Interfaces:

Dispatcher, SemanticDispatcher

public class CommonJoinTaskDispatcher
extends AbstractJoinTaskDispatcher
implements SemanticDispatcher

Iterator each tasks. If this task has a local work,create a new task for this local work, named MapredLocalTask. then make this new generated task depends on current task's parent task, and make current task depends on this new generated task

Field Summary

Fields

Modifier and Type	Field and Description
protected org.slf4j.Logger	LOG

Fields inherited from class org.apache.hadoop.hive.ql.optimizer.physical.AbstractJoinTaskDispatcher

physicalContext

Constructor Summary

Constructors

Constructor and Description
CommonJoinTaskDispatcher(PhysicalContext context)

Method Summary

Modifier and Type	Method and Description
static boolean	cannotConvert(long aliasKnownSize, long aliasTotalKnownInputSize, long ThresholdOfSmallTblSizeSum)
Task<?>	processCurrentTask(MapRedTask currTask, ConditionalTask conditionalTask, Context context)

Methods inherited from class org.apache.hadoop.hive.ql.optimizer.physical.AbstractJoinTaskDispatcher

dispatch, getTotalKnownInputSize, replaceTask, replaceTaskWithConditionalTask

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.hadoop.hive.ql.lib.SemanticDispatcher

dispatch

Field Detail

LOG

protected final org.slf4j.Logger LOG

Constructor Detail

CommonJoinTaskDispatcher

public CommonJoinTaskDispatcher(PhysicalContext context)

Method Detail

cannotConvert

public static boolean cannotConvert(long aliasKnownSize,
                                    long aliasTotalKnownInputSize,
                                    long ThresholdOfSmallTblSizeSum)

processCurrentTask

public Task<?> processCurrentTask(MapRedTask currTask,
                                  ConditionalTask conditionalTask,
                                  Context context)
                           throws SemanticException

Specified by:

processCurrentTask in class AbstractJoinTaskDispatcher

Throws:

SemanticException