[jira] [Commented] (YARN-8632) Threads in SLS quit without logging exception

["Yufei Gu (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-8632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16592032#comment-16592032 ] 

Yufei Gu commented on YARN-8632:
--------------------------------

+1 for the patch v4. Committed to trunk. Thanks [~luxianghao] for the patch.

> Threads in SLS quit without logging exception 
> ----------------------------------------------
>
>                 Key: YARN-8632
>                 URL: https://issues.apache.org/jira/browse/YARN-8632
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: scheduler-load-simulator
>            Reporter: Xianghao Lu
>            Assignee: Xianghao Lu
>            Priority: Major
>         Attachments: YARN-8632-branch-2.7.2.001.patch, YARN-8632.001.patch, YARN-8632.002.patch, YARN-8632.003.patch, YARN-8632.004.patch
>
>
> Recently, I have been using [SchedulerLoadSimulator|https://hadoop.apache.org/docs/r2.7.2/hadoop-sls/SchedulerLoadSimulator.html] to validate the impact of changes on my FairScheduler. I encountered some problems.
>  Firstly, I fix a npe bug with the patch in https://issues.apache.org/jira/browse/YARN-4302
>  Secondly, everything seems to be ok, but I just get "[]" in file realtimetrack.json. Finally, I find the MetricsLogRunnable thread will exit because of npe,
>  the reason is "wrapper.getQueueSet()" is still null when executing "String metrics = web.generateRealTimeTrackingMetrics();"
>  So, we should put "String metrics = web.generateRealTimeTrackingMetrics();" in try section to avoid MetricsLogRunnable thread exit with unexpected exception. 
>  My hadoop version is 2.7.2, it seems that hadoop trunk branch also has the second problem and I have made a patch to solve it.



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