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Naganarasimha G R commented on YARN-4711: ----------------------------------------- Thanks [~sjlee0] for the review and the commit ! > NM is going down with NPE's due to single thread processing of events by > Timeline client > ---------------------------------------------------------------------------------------- > > Key: YARN-4711 > URL: https://issues.apache.org/jira/browse/YARN-4711 > Project: Hadoop YARN > Issue Type: Sub-task > Components: timelineserver > Reporter: Naganarasimha G R > Assignee: Naganarasimha G R > Priority: Critical > Labels: yarn-2928-1st-milestone > Fix For: YARN-2928 > > Attachments: 4711Analysis.txt, YARN-4711-YARN-2928.v1.001.patch, > YARN-4711-YARN-2928.v1.002.patch > > > After YARN-3367, while testing the latest 2928 branch came across few NPEs > due to which NM is shutting down. > {code} > 2016-02-21 23:19:54,078 FATAL org.apache.hadoop.yarn.event.AsyncDispatcher: > Error in dispatcher thread > java.lang.NullPointerException > at > org.apache.hadoop.yarn.server.nodemanager.timelineservice.NMTimelinePublisher$ContainerEventHandler.handle(NMTimelinePublisher.java:306) > at > org.apache.hadoop.yarn.server.nodemanager.timelineservice.NMTimelinePublisher$ContainerEventHandler.handle(NMTimelinePublisher.java:296) > at > org.apache.hadoop.yarn.event.AsyncDispatcher.dispatch(AsyncDispatcher.java:183) > at > org.apache.hadoop.yarn.event.AsyncDispatcher$1.run(AsyncDispatcher.java:109) > at java.lang.Thread.run(Thread.java:745) > {code} > {code} > java.lang.NullPointerException > at > org.apache.hadoop.yarn.server.nodemanager.timelineservice.NMTimelinePublisher.putEntity(NMTimelinePublisher.java:213) > at > org.apache.hadoop.yarn.server.nodemanager.timelineservice.NMTimelinePublisher.publishContainerFinishedEvent(NMTimelinePublisher.java:192) > at > org.apache.hadoop.yarn.server.nodemanager.timelineservice.NMTimelinePublisher.access$400(NMTimelinePublisher.java:63) > at > org.apache.hadoop.yarn.server.nodemanager.timelineservice.NMTimelinePublisher$ApplicationEventHandler.handle(NMTimelinePublisher.java:289) > at > org.apache.hadoop.yarn.server.nodemanager.timelineservice.NMTimelinePublisher$ApplicationEventHandler.handle(NMTimelinePublisher.java:280) > at > org.apache.hadoop.yarn.event.AsyncDispatcher.dispatch(AsyncDispatcher.java:183) > at > org.apache.hadoop.yarn.event.AsyncDispatcher$1.run(AsyncDispatcher.java:109) > at java.lang.Thread.run(Thread.java:745) > {code} > On analysis found that the there was delay in processing of events, as after > YARN-3367 all the events were getting processed by a single thread inside the > timeline client. > Additionally found one scenario where there is possibility of NPE: > * TimelineEntity.toString() when {{real}} is not null -- This message was sent by Atlassian JIRA (v6.3.4#6332)