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https://issues.apache.org/jira/browse/TEZ-2855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14907412#comment-14907412
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Bikas Saha commented on TEZ-2855:
---------------------------------
Orthogonal observation - this was greatly simplified by having the
remoteTaskSpec log which showed output vertices for all started attempts.
Without that log, we would have to manually figure out which vertex was the
output of the started attempts and that would have been cumbersome. This log
has been removed now and rightly so because in general its voluminous and not
useful. Perhaps the patch for this jira could add some debug info under
exception handling that would dump the entity and event. Some events may need
better toString() methods to show the info.
> NPE while routing events
> ------------------------
>
> Key: TEZ-2855
> URL: https://issues.apache.org/jira/browse/TEZ-2855
> Project: Apache Tez
> Issue Type: Bug
> Affects Versions: 0.8.0-alpha
> Reporter: Siddharth Seth
> Priority: Critical
> Attachments: 2855log.gz
>
>
> Observed while running against 0.8.0-alpha. This will likely affect 0.7 as
> well - that'll be known after debugging.
> {code}
> 2015-09-24T12:13:42,675 ERROR [Dispatcher thread: Central]
> common.AsyncDispatcher: Error in dispatcher thread
> java.lang.NullPointerException
> at
> org.apache.tez.dag.app.dag.impl.VertexImpl.handleRoutedTezEvents(VertexImpl.java:4429)
> ~[TezAppJar.jar:0.8.0-alpha]
> at
> org.apache.tez.dag.app.dag.impl.VertexImpl.access$4000(VertexImpl.java:203)
> ~[TezAppJar.jar:0.8.0-alpha]
> at
> org.apache.tez.dag.app.dag.impl.VertexImpl$RouteEventTransition.transition(VertexImpl.java:4175)
> ~[TezAppJar.jar:0.8.0-alpha]
> at
> org.apache.tez.dag.app.dag.impl.VertexImpl$RouteEventTransition.transition(VertexImpl.java:4167)
> ~[TezAppJar.jar:0.8.0-alpha]
> at
> org.apache.hadoop.yarn.state.StateMachineFactory$MultipleInternalArc.doTransition(StateMachineFactory.java:385)
> ~[hadoop-yarn-common-2.6.0.jar:?]
> at
> org.apache.hadoop.yarn.state.StateMachineFactory.doTransition(StateMachineFactory.java:302)
> ~[hadoop-yarn-common-2.6.0.jar:?]
> at
> org.apache.hadoop.yarn.state.StateMachineFactory.access$300(StateMachineFactory.java:46)
> ~[hadoop-yarn-common-2.6.0.jar:?]
> at
> org.apache.hadoop.yarn.state.StateMachineFactory$InternalStateMachine.doTransition(StateMachineFactory.java:448)
> ~[hadoop-yarn-common-2.6.0.jar:?]
> at
> org.apache.tez.state.StateMachineTez.doTransition(StateMachineTez.java:57)
> ~[TezAppJar.jar:0.8.0-alpha]
> at org.apache.tez.dag.app.dag.impl.VertexImpl.handle(VertexImpl.java:1906)
> ~[TezAppJar.jar:0.8.0-alpha]
> at org.apache.tez.dag.app.dag.impl.VertexImpl.handle(VertexImpl.java:202)
> ~[TezAppJar.jar:0.8.0-alpha]
> at
> org.apache.tez.dag.app.DAGAppMaster$VertexEventDispatcher.handle(DAGAppMaster.java:2069)
> ~[TezAppJar.jar:0.8.0-alpha]
> at
> org.apache.tez.dag.app.DAGAppMaster$VertexEventDispatcher.handle(DAGAppMaster.java:2055)
> ~[TezAppJar.jar:0.8.0-alpha]
> at org.apache.tez.common.AsyncDispatcher.dispatch(AsyncDispatcher.java:183)
> [tez-common-0.8.0-alpha.jar:0.8.0-alpha]
> at org.apache.tez.common.AsyncDispatcher$1.run(AsyncDispatcher.java:114)
> [tez-common-0.8.0-alpha.jar:0.8.0-alpha]
> at java.lang.Thread.run(Thread.java:745) [?:1.8.0_40]
> 2015-09-24T12:13:42,681 INFO [HistoryEventHandlingThread]
> impl.SimpleHistoryLoggingService: Writing event TASK_ATTEMPT_FINISHED to
> history file
> {code}
> Looks like the VertexManager was null.
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