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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 Wed, 13 Feb 2013 22:34:12 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13578000#comment-13578000
] 

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

Possible approaches:

# Throw in a sleep before checking, and hopefully the process would have received the signal.
Simple to do, but need not always work.
# Check if the process died OR (the signal has been delivered AND the process is not stuck
in kernel mode)
                
> 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
>
> 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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