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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3919) NPEs' while stopping service after exception during CommonNodeLabelsManager#start
Date Thu, 30 Jul 2015 11:40:07 GMT

    [ https://issues.apache.org/jira/browse/YARN-3919?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14647501#comment-14647501
] 

Hudson commented on YARN-3919:
------------------------------

FAILURE: Integrated in Hadoop-Yarn-trunk-Java8 #272 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk-Java8/272/])
YARN-3919. NPEs' while stopping service after exception during CommonNodeLabelsManager#start.
(varun saxena via rohithsharmaks) (rohithsharmaks: rev c020b62cf8de1f3baadc9d2f3410640ef7880543)
* hadoop-yarn-project/CHANGES.txt
* hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/nodelabels/FileSystemNodeLabelsStore.java
* hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/event/AsyncDispatcher.java


> 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
>            Priority: Trivial
>             Fix For: 2.8.0
>
>         Attachments: 0003-YARN-3919.patch, 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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