Xianghao Lu commented on YARN-8632:

[~ywskycn] or [~yufeigu]  Woud you like to review the patch? Thanks!

> 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
>            Priority: Major
>         Attachments: 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 = 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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