org.apache.hadoop.hive.ql.optimizer.physical
Class LocalMapJoinProcFactory
java.lang.Object
org.apache.hadoop.hive.ql.optimizer.physical.LocalMapJoinProcFactory
public final class LocalMapJoinProcFactory
- extends Object
Node processor factory for map join resolver. What it did is to replace the
map-join operator in the local map join task with a hash-table dump operator.
And if the map join is followed by a group by, the hash-table sink
operator/mapjoin operator should be configured to use less memory to avoid
OOM in group by operator.
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
getJoinProc
public static NodeProcessor getJoinProc()
getGroupByProc
public static NodeProcessor getGroupByProc()
getDefaultProc
public static NodeProcessor getDefaultProc()
Copyright © 2012 The Apache Software Foundation