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https://issues.apache.org/jira/browse/TEZ-2107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14322307#comment-14322307
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Jeff Zhang commented on TEZ-2107:
---------------------------------
Link to TEZ-1019, refactor recovery code to use the normal state machine flow
may resolve this issue.
> Recovery failure in the case of Auto-reduce parallelism
> -------------------------------------------------------
>
> Key: TEZ-2107
> URL: https://issues.apache.org/jira/browse/TEZ-2107
> Project: Apache Tez
> Issue Type: Sub-task
> Reporter: Jeff Zhang
> Assignee: Jeff Zhang
>
> The following errors happens when recovering in the case of auto-reduce
> parallelism. The task number is reduced from 2 to 1. while the upstream
> vertex's DataMovementEvent is still routed to task 2 which has been removed
> when auto-reduce parallelism.
> {code}
> 2015-02-16 09:11:54,587 FATAL [Dispatcher thread: Central]
> common.AsyncDispatcher: Error in dispatcher thread
> org.apache.tez.dag.api.TezUncheckedException: Unexpected null task.
> sourceVertex=vertex_1424048826974_0002_1_00 [scope-47] srcTaskIndex = 0
> destVertex=vertex_1424048826974_0002_1_01 [scope-50] destTaskIndex=1
> destNumTasks=1
> edgeManager=org.apache.tez.dag.app.dag.impl.ScatterGatherEdgeManager
> at
> org.apache.tez.dag.app.dag.impl.Edge.sendDmEventOrIfEventToTasks(Edge.java:358)
> at
> org.apache.tez.dag.app.dag.impl.Edge.sendTezEventToDestinationTasks(Edge.java:422)
> at
> org.apache.tez.dag.app.dag.impl.Edge.handleCompositeDataMovementEvent(Edge.java:310)
> at
> org.apache.tez.dag.app.dag.impl.Edge.sendTezEventToDestinationTasks(Edge.java:378)
> at
> org.apache.tez.dag.app.dag.impl.VertexImpl.handleRoutedTezEvents(VertexImpl.java:3795)
> at
> org.apache.tez.dag.app.dag.impl.VertexImpl.access$3600(VertexImpl.java:187)
> at
> org.apache.tez.dag.app.dag.impl.VertexImpl$RouteEventTransition.transition(VertexImpl.java:3708)
> at
> org.apache.tez.dag.app.dag.impl.VertexImpl$RouteEventTransition.transition(VertexImpl.java:3700)
> at
> org.apache.hadoop.yarn.state.StateMachineFactory$MultipleInternalArc.doTransition(StateMachineFactory.java:385)
> at
> org.apache.hadoop.yarn.state.StateMachineFactory.doTransition(StateMachineFactory.java:302)
> at
> org.apache.hadoop.yarn.state.StateMachineFactory.access$300(StateMachineFactory.java:46)
> at
> org.apache.hadoop.yarn.state.StateMachineFactory$InternalStateMachine.doTransition(StateMachineFactory.java:448)
> at
> org.apache.tez.state.StateMachineTez.doTransition(StateMachineTez.java:57)
> at org.apache.tez.dag.app.dag.impl.VertexImpl.handle(VertexImpl.java:1575)
> at org.apache.tez.dag.app.dag.impl.VertexImpl.handle(VertexImpl.java:186)
> at
> org.apache.tez.dag.app.DAGAppMaster$VertexEventDispatcher.handle(DAGAppMaster.java:1802)
> at
> org.apache.tez.dag.app.DAGAppMaster$VertexEventDispatcher.handle(DAGAppMaster.java:1788)
> at
> org.apache.tez.common.AsyncDispatcher.dispatch(AsyncDispatcher.java:184)
> at org.apache.tez.common.AsyncDispatcher$1.run(AsyncDispatcher.java:115)
> at java.lang.Thread.run(Thread.java:745)
> {code}
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