[jira] Updated: (MAPREDUCE-2180) Add coverage of fair scheduler servlet to system test

["Todd Lipcon (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2180?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Todd Lipcon updated MAPREDUCE-2180:
-----------------------------------

    Attachment: mapreduce-2180.txt

Attached patch exercises the servlet at /scheduler while running the jobs. Under jcarder, this shows the lock inversion in the previous release and shows that it is gone in trunk.

> Add coverage of fair scheduler servlet to system test
> -----------------------------------------------------
>
>                 Key: MAPREDUCE-2180
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2180
>             Project: Hadoop Map/Reduce
>          Issue Type: Test
>          Components: contrib/fair-share
>    Affects Versions: 0.22.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Minor
>         Attachments: mapreduce-2180.txt
>
>
> MAPREDUCE-2051 added a system test for the fair scheduler which starts a minicluster and runs a couple jobs with preemption on. I recently found a deadlock in a previous version of the scheduler that was due to lock inversion between the scheduler servlet and some JT internals. I'd like to modify the existing system test to also hit the /scheduler servlet, allowing jcarder to detect such lock inversions in the future.

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