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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2092) Pipes C++ task does not die even if the Java tasks die
Date Wed, 24 Oct 2007 09:28:50 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12537252
] 

Arun C Murthy commented on HADOOP-2092:
---------------------------------------

+1

bq.But, I still think that we need to handle the case where the pipes process is doing a long
computation (without frequent progress reports) and the Java side gets killed during that
time.

The two options are:
   * Background thread which periodically pings the parent java map/reduce task to check if
it is alive and kills the c++ process if not.
   * Use unix jobcontrol features i.e. make the java task the session the _process group leader_
(via setsid) and then send SIGTERM to the entire process group.

Being old-skool, I prefer jobcontrol. *smile*

> Pipes C++ task does not die even if the Java tasks die
> ------------------------------------------------------
>
>                 Key: HADOOP-2092
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2092
>             Project: Hadoop
>          Issue Type: Bug
>          Components: pipes
>            Reporter: Amareshwari Sri Ramadasu
>            Assignee: Amareshwari Sri Ramadasu
>             Fix For: 0.16.0
>
>
> Pipes process does not die, when the java map task  dies.
> Pipes process does not die even when the cluster is down.

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