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From "Karthik Kambatla (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5005) TestProcfsProcessTree#testProcessTree() doesn't wait long enough for the process to die
Date Fri, 15 Feb 2013 19:33:13 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13579442#comment-13579442
] 

Karthik Kambatla commented on MAPREDUCE-5005:
---------------------------------------------

A combination of the two approaches might be the best. Essentially, do what Sandy says, and
then if the process hasn't died, check the status of the process in /proc/pid.

Will put up a preliminary patch, and we can reiterate if need be.
                
> TestProcfsProcessTree#testProcessTree() doesn't wait long enough for the process to die
> ---------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-5005
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5005
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 2.0.2-alpha
>            Reporter: Karthik Kambatla
>            Assignee: Karthik Kambatla
>
> TestProcfsProcessTree#testProcessTree fails occasionally with the following stack trace
> {noformat}
> Stack Trace:
> junit.framework.AssertionFailedError: expected:<false> but was:<true>
>         at org.apache.hadoop.util.TestProcfsBasedProcessTree.testProcessTree(TestProcfsBasedProcessTree.java)
> {noformat}
> kill -9 is executed asynchronously, the signal is delivered when the process comes out
of the kernel (sys call). Checking if the process died immediately after can fail at times.

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