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Vrushali C commented on YARN-6555: ---------------------------------- I am seeing this in our code that's backported to branch-2 (2.6 with some backports). But I believe this will happen on any branch since we have not yet written the code to read/write flow context during NM restart/container recovery. For example here is the relevant place where we would need to add it on branch YARN-5355: https://github.com/apache/hadoop/blob/YARN-5355/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/ContainerManagerImpl.java#L387 Similarly on trunk: https://github.com/apache/hadoop/blob/trunk/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/ContainerManagerImpl.java#L387 > Enable flow context read (& corresponding write) for recovering application > with NM restart > -------------------------------------------------------------------------------------------- > > Key: YARN-6555 > URL: https://issues.apache.org/jira/browse/YARN-6555 > Project: Hadoop YARN > Issue Type: Sub-task > Components: timelineserver > Reporter: Vrushali C > Assignee: Vrushali C > > If timeline service v2 is enabled and NM is restarted with recovery enabled, > then NM fails to start and throws an error as "flow context can't be null". > This is happening because the flow context did not exist before but now that > timeline service v2 is enabled, ApplicationImpl expects it to exist. > This would also happen even if flow context existed before but since we are > not persisting it / reading it during > ContainerManagerImpl#recoverApplication, it does not get passed in to > ApplicationImpl. > full stack trace > {code} > 2017-05-03 21:51:52,178 FATAL > org.apache.hadoop.yarn.server.nodemanager.NodeManager: Error starting > NodeManager > java.lang.IllegalArgumentException: flow context cannot be null > at > org.apache.hadoop.yarn.server.nodemanager.containermanager.application.ApplicationImpl.<init>(ApplicationImpl.java:104) > at > org.apache.hadoop.yarn.server.nodemanager.containermanager.application.ApplicationImpl.<init>(ApplicationImpl.java:90) > at > org.apache.hadoop.yarn.server.nodemanager.containermanager.ContainerManagerImpl.recoverApplication(ContainerManagerImpl.java:318) > at > org.apache.hadoop.yarn.server.nodemanager.containermanager.ContainerManagerImpl.recover(ContainerManagerImpl.java:280) > at > org.apache.hadoop.yarn.server.nodemanager.containermanager.ContainerManagerImpl.serviceInit(ContainerManagerImpl.java:267) > at > org.apache.hadoop.service.AbstractService.init(AbstractService.java:163) > at > org.apache.hadoop.service.CompositeService.serviceInit(CompositeService.java:107) > at > org.apache.hadoop.yarn.server.nodemanager.NodeManager.serviceInit(NodeManager.java:276) > at > org.apache.hadoop.service.AbstractService.init(AbstractService.java:163) > at > org.apache.hadoop.yarn.server.nodemanager.NodeManager.initAndStartNodeManager(NodeManager.java:588) > at > org.apache.hadoop.yarn.server.nodemanager.NodeManager.main(NodeManager.java:649) > {code} -- This message was sent by Atlassian JIRA (v6.3.15#6346) --------------------------------------------------------------------- To unsubscribe, e-mail: yarn-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: yarn-issues-h...@hadoop.apache.org