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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