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https://issues.apache.org/jira/browse/YARN-8632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16592062#comment-16592062
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Hudson commented on YARN-8632:
------------------------------
SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #14825 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/14825/])
YARN-8632. Threads in SLS quit without logging exception. Contributed by
(yufei_gu: rev 8563fd67befeb0026a95ae268395baf04cd3c22f)
* (edit)
hadoop-tools/hadoop-sls/src/main/java/org/apache/hadoop/yarn/sls/scheduler/SchedulerMetrics.java
> 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
> Fix For: 3.2.0
>
> 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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