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https://issues.apache.org/jira/browse/YARN-8350?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16495617#comment-16495617
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Billie Rinaldi commented on YARN-8350:
--------------------------------------
Ah, okay. Thanks, I missed that part.
> NPE in service AM related to placement policy
> ---------------------------------------------
>
> Key: YARN-8350
> URL: https://issues.apache.org/jira/browse/YARN-8350
> Project: Hadoop YARN
> Issue Type: Bug
> Components: yarn-native-services
> Reporter: Billie Rinaldi
> Assignee: Gour Saha
> Priority: Critical
> Attachments: YARN-8350.01.patch, YARN-8350.02.patch
>
>
> It seems like this NPE is happening in a service with more than one component
> when one component has a placement policy and the other does not. It causes
> the AM to crash.
> {noformat}
> java.lang.NullPointerException
> at
> org.apache.hadoop.yarn.service.component.Component.requestContainers(Component.java:644)
> at
> org.apache.hadoop.yarn.service.component.Component$FlexComponentTransition.transition(Component.java:310)
> at
> org.apache.hadoop.yarn.service.component.Component$FlexComponentTransition.transition(Component.java:293)
> 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$500(StateMachineFactory.java:46)
> at
> org.apache.hadoop.yarn.state.StateMachineFactory$InternalStateMachine.doTransition(StateMachineFactory.java:487)
> at
> org.apache.hadoop.yarn.service.component.Component.handle(Component.java:919)
> at
> org.apache.hadoop.yarn.service.ServiceScheduler.serviceStart(ServiceScheduler.java:344)
> at
> org.apache.hadoop.service.AbstractService.start(AbstractService.java:194)
> at
> org.apache.hadoop.service.CompositeService.serviceStart(CompositeService.java:121)
> at
> org.apache.hadoop.yarn.service.ServiceMaster.lambda$serviceStart$0(ServiceMaster.java:253)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:422)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1682)
> at
> org.apache.hadoop.yarn.service.ServiceMaster.serviceStart(ServiceMaster.java:251)
> at
> org.apache.hadoop.service.AbstractService.start(AbstractService.java:194)
> at
> org.apache.hadoop.yarn.service.ServiceMaster.main(ServiceMaster.java:317)
> {noformat}
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