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From "Xianghao Lu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-8632) No data in file realtimetrack.json after running SchedulerLoadSimulator
Date Mon, 13 Aug 2018 11:51:00 GMT

     [ https://issues.apache.org/jira/browse/YARN-8632?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Xianghao Lu updated YARN-8632:
    Attachment:     (was: YARN-8632.001.patch)

> No data in file realtimetrack.json after running SchedulerLoadSimulator
> -----------------------------------------------------------------------
>                 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-, YARN-8632.001.patch
> Recently, I have beenning 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 =
>  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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