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From "Varun Saxena (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3919) NPEs' while stopping service after exception during CommonNodeLabelsManager#start
Date Wed, 22 Jul 2015 19:00:05 GMT

    [ https://issues.apache.org/jira/browse/YARN-3919?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14637442#comment-14637442
] 

Varun Saxena commented on YARN-3919:
------------------------------------

[~rohithsharma], kindly review

> NPEs' while stopping service after exception during CommonNodeLabelsManager#start
> ---------------------------------------------------------------------------------
>
>                 Key: YARN-3919
>                 URL: https://issues.apache.org/jira/browse/YARN-3919
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 2.7.0
>            Reporter: Varun Saxena
>            Assignee: Varun Saxena
>         Attachments: YARN-3919.01.patch, YARN-3919.02.patch
>
>
> We get NPE during CommonNodeLabelsManager#serviceStop and AsyncDispatcher#serviceStop
if ConnectException on call to CommonNodeLabelsManager#serviceStart occurs.
> {noformat}
> 2015-07-10 19:39:37,825 WARN main-EventThread org.apache.hadoop.service.AbstractService:
When stopping the service org.apache.hadoop.yarn.nodelabels.CommonNodeLabelsManager : java.lang.NullPointerException
> java.lang.NullPointerException
>         at org.apache.hadoop.yarn.nodelabels.FileSystemNodeLabelsStore.close(FileSystemNodeLabelsStore.java:99)
>         at org.apache.hadoop.yarn.nodelabels.CommonNodeLabelsManager.serviceStop(CommonNodeLabelsManager.java:278)
>         at org.apache.hadoop.service.AbstractService.stop(AbstractService.java:221)
>         at org.apache.hadoop.service.ServiceOperations.stop(ServiceOperations.java:52)
>         at org.apache.hadoop.service.ServiceOperations.stopQuietly(ServiceOperations.java:80)
>         at org.apache.hadoop.service.AbstractService.start(AbstractService.java:203)
>         at org.apache.hadoop.service.CompositeService.serviceStart(CompositeService.java:120)
>         at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$RMActiveServices.serviceStart(ResourceManager.java:588)
>         at org.apache.hadoop.service.AbstractService.start(AbstractService.java:193)
>         at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.startActiveServices(ResourceManager.java:998)
>         at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$1.run(ResourceManager.java:1039)
>         at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$1.run(ResourceManager.java:1035)
> {noformat}
> {noformat}
> java.lang.NullPointerException
>         at org.apache.hadoop.yarn.event.AsyncDispatcher.serviceStop(AsyncDispatcher.java:142)
>         at org.apache.hadoop.service.AbstractService.stop(AbstractService.java:221)
>         at org.apache.hadoop.service.ServiceOperations.stop(ServiceOperations.java:52)
>         at org.apache.hadoop.service.ServiceOperations.stopQuietly(ServiceOperations.java:80)
>         at org.apache.hadoop.service.CompositeService.stop(CompositeService.java:157)
>         at org.apache.hadoop.service.CompositeService.serviceStop(CompositeService.java:131)
>         at org.apache.hadoop.service.AbstractService.stop(AbstractService.java:221)
>         at org.apache.hadoop.service.ServiceOperations.stop(ServiceOperations.java:52)
>         at org.apache.hadoop.service.ServiceOperations.stopQuietly(ServiceOperations.java:80)
> {noformat}
> These NPEs' fill up the logs. Although, this doesn't cause any functional issue but its
a nuisance and we ideally should have null checks in serviceStop.



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