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