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From "Bo Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-76) killApplication doesn't fully kill application master
Date Tue, 04 Sep 2012 18:29:10 GMT

    [ https://issues.apache.org/jira/browse/YARN-76?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13447902#comment-13447902
] 

Bo Wang commented on YARN-76:
-----------------------------

Vinod, I wonder if you are interested and have time to look at this issue. It's a problem
for MacOS, not sure how it works on Windows.

Thanks,
Bo

                
> killApplication doesn't fully kill application master
> -----------------------------------------------------
>
>                 Key: YARN-76
>                 URL: https://issues.apache.org/jira/browse/YARN-76
>             Project: Hadoop YARN
>          Issue Type: Bug
>         Environment: Failed on MacOS. OK on Linux
>            Reporter: Bo Wang
>
> When client sends a ClientRMProtocol#killApplication to RM, the corresponding AM is supposed
to be killed. However, on Mac OS, the AM is still alive (w/o any interruption).
> I figured out part of the reason after some debugging. NM starts a AM with command like
"/bin/bash -c /path/to/java SampleAM". This command is executed in a process (say with PID
0001), which starts another Java process (say with PID 0002). When NM kills the AM, it send
SIGTERM and then SIGKILL to the bash process (PID 0001). In Linux, the death of the bash process
(PID 0001) will trigger the kill of the Java process (PID 0002). However, in Mac OS, only
the bash process is killed. The Java process is in the wild since then.
> Note: on Mac OS, DefaultContainerExecutor is used rather than LinuxContainerExecutor.

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