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https://issues.apache.org/jira/browse/HADOOP-12313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15021850#comment-15021850
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Steve Loughran commented on HADOOP-12313:
-----------------------------------------
although its nice to have a fix, I'm testing HADOOP-12321 for a broader one ...
it relies on the yarn service model for a strict state machine & won't won't do
things like permit calls to start twice spawning off a thread again, etc.
> NPE in JvmPauseMonitor when calling stop() before start()
> ---------------------------------------------------------
>
> Key: HADOOP-12313
> URL: https://issues.apache.org/jira/browse/HADOOP-12313
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Rohith Sharma K S
> Assignee: Gabor Liptak
> Priority: Critical
> Fix For: 2.8.0
>
> Attachments: HADOOP-12313.2.patch, HADOOP-12313.3.patch,
> YARN-4035.1.patch
>
>
> It is observed that after YARN-4019 some tests are failing in
> TestRMAdminService with null pointer exceptions in build [build failure
> |https://builds.apache.org/job/PreCommit-YARN-Build/8792/artifact/patchprocess/testrun_hadoop-yarn-server-resourcemanager.txt]
> {noformat}
> unning org.apache.hadoop.yarn.server.resourcemanager.TestRMAdminService
> Tests run: 19, Failures: 0, Errors: 2, Skipped: 0, Time elapsed: 11.541 sec
> <<< FAILURE! - in
> org.apache.hadoop.yarn.server.resourcemanager.TestRMAdminService
> testModifyLabelsOnNodesWithDistributedConfigurationDisabled(org.apache.hadoop.yarn.server.resourcemanager.TestRMAdminService)
> Time elapsed: 0.132 sec <<< ERROR!
> java.lang.NullPointerException: null
> at org.apache.hadoop.util.JvmPauseMonitor.stop(JvmPauseMonitor.java:86)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$RMActiveServices.serviceStop(ResourceManager.java:601)
> at
> org.apache.hadoop.service.AbstractService.stop(AbstractService.java:221)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.stopActiveServices(ResourceManager.java:983)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.transitionToStandby(ResourceManager.java:1038)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.serviceStop(ResourceManager.java:1085)
> at
> org.apache.hadoop.service.AbstractService.stop(AbstractService.java:221)
> at
> org.apache.hadoop.service.AbstractService.close(AbstractService.java:250)
> at
> org.apache.hadoop.yarn.server.resourcemanager.TestRMAdminService.testModifyLabelsOnNodesWithDistributedConfigurationDisabled(TestRMAdminService.java:824)
> testRemoveClusterNodeLabelsWithDistributedConfigurationEnabled(org.apache.hadoop.yarn.server.resourcemanager.TestRMAdminService)
> Time elapsed: 0.121 sec <<< ERROR!
> java.lang.NullPointerException: null
> at org.apache.hadoop.util.JvmPauseMonitor.stop(JvmPauseMonitor.java:86)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$RMActiveServices.serviceStop(ResourceManager.java:601)
> at
> org.apache.hadoop.service.AbstractService.stop(AbstractService.java:221)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.stopActiveServices(ResourceManager.java:983)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.transitionToStandby(ResourceManager.java:1038)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.serviceStop(ResourceManager.java:1085)
> at
> org.apache.hadoop.service.AbstractService.stop(AbstractService.java:221)
> at
> org.apache.hadoop.service.AbstractService.close(AbstractService.java:250)
> at
> org.apache.hadoop.yarn.server.resourcemanager.TestRMAdminService.testRemoveClusterNodeLabelsWithDistributedConfigurationEnabled(TestRMAdminService.java:867)
> {noformat}
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