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From "Yang Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6630) Container worker dir could not recover when NM restart
Date Wed, 24 May 2017 07:27:04 GMT

    [ https://issues.apache.org/jira/browse/YARN-6630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16022445#comment-16022445
] 

Yang Wang commented on YARN-6630:
---------------------------------

When yarn.nodemanager.recovery.enabled is true, nm will not clear any workdir. However, container.workDir
didn't recover and is null.

> Container worker dir could not recover when NM restart
> ------------------------------------------------------
>
>                 Key: YARN-6630
>                 URL: https://issues.apache.org/jira/browse/YARN-6630
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Yang Wang
>
> When yarn.nodemanager.recovery.enabled is true and ContainerRetryPolicy is NEVER_RETRY,
container worker dir will not be saved in NM state store. 
> {code:title=ContainerLaunch.java}
> ...
>   private void recordContainerWorkDir(ContainerId containerId,
>       String workDir) throws IOException{
>     container.setWorkDir(workDir);
>     if (container.isRetryContextSet()) {
>       context.getNMStateStore().storeContainerWorkDir(containerId, workDir);
>     }
>   }
> {code}
> Then NM restarts, container.workDir is null, and may cause other exceptions.
> {code:title=ContainerImpl.java}
>   static class ResourceLocalizedWhileRunningTransition
>       extends ContainerTransition {
> ...
>           String linkFile = new Path(container.workDir, link).toString();
> ...
> {code}
> {code}
> java.lang.IllegalArgumentException: Can not create a Path from a null string
>         at org.apache.hadoop.fs.Path.checkPathArg(Path.java:159)
>         at org.apache.hadoop.fs.Path.<init>(Path.java:175)
>         at org.apache.hadoop.fs.Path.<init>(Path.java:110)
> ... ...
> {code}



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