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From "Eric Badger (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-13709) Clean up subprocesses spawned by Shell.java:runCommand when the shell process exits
Date Fri, 14 Oct 2016 21:42:20 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-13709?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Eric Badger updated HADOOP-13709:
---------------------------------
    Attachment: HADOOP-13709.002.patch

Attaching new patch that uses a shutdown hook to kill the child process that was spawned by
shell. I tested this on a local cluster on the localizer use case from YARN-5641. I replaced
the {{untar}} process with a {{sleep 1000000}} process and confirmed that the {{sleep}} was
killed immediately after the localizer. Before this patch, the localizer would shutdown without
killing the {{sleep}} process. 

 [~jlowe], [~daryn], please review

> Clean up subprocesses spawned by Shell.java:runCommand when the shell process exits
> -----------------------------------------------------------------------------------
>
>                 Key: HADOOP-13709
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13709
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 2.2.0
>            Reporter: Eric Badger
>            Assignee: Eric Badger
>         Attachments: HADOOP-13709.001.patch, HADOOP-13709.002.patch
>
>
> The runCommand code in Shell.java can get into a situation where it will ignore InterruptedExceptions
and refuse to shutdown due to being in I/O waiting for the return value of the subprocess
that was spawned. We need to allow for the subprocess to be interrupted and killed when the
shell process gets killed. Currently the JVM will shutdown and all of the subprocesses will
be orphaned and not killed.



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