[jira] [Created] (YARN-8632) No data in file realtimetrack.json after running SchedulerLoadSimulator

["Xianghao Lu (JIRA)" <ji...@apache.org>]

Xianghao Lu created YARN-8632:
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             Summary: 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


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 this problem and I have made a patch to solve it.



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