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From "Rohith (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3091) [Umbrella] Improve locks of RM scheduler
Date Fri, 23 Jan 2015 04:49:35 GMT

    [ https://issues.apache.org/jira/browse/YARN-3091?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14288746#comment-14288746
] 

Rohith commented on YARN-3091:
------------------------------

bq. fixing improperly synchronized data accesses in RM scheduler (correctness)
currently findbug exclude xml mask these warnings like IS2_INCONSISTENT_SYNC. I believe these
exclude lists are reviewed and now assumptions like a class expected to be thread-safe. Recently
had discussion on this in community [Discussion thread|http://mail-archives.apache.org/mod_mbox/hadoop-yarn-dev/201412.mbox/%3CCALwhT97BqK_zjQ=MCO_c=Y=7r9ewLN2Ab_qm=VqEKvXgZrQkGA@mail.gmail.com%3E]

For identifying 1st level of problems, I think enabling these findbug type would help in better
way.

> [Umbrella] Improve locks of RM scheduler
> ----------------------------------------
>
>                 Key: YARN-3091
>                 URL: https://issues.apache.org/jira/browse/YARN-3091
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: capacityscheduler, fairscheduler, resourcemanager, scheduler
>            Reporter: Wangda Tan
>
> In existing YARN RM scheduler, there're some issues of using locks. For example:
> - Many unnecessary synchronized locks, we have seen several cases recently that too frequent
access of scheduler makes scheduler hang. Which could be addressed by using read/write lock.
Components include scheduler, CS queues, apps
> - Some fields not properly locked (Like clusterResource)
> We can address them together in this ticket.
> (More details see comments below)



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