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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, 02 Dec 2016 20:28:59 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-13709.009.patch

Uploading a new patch. 
[~jlowe], I took out the static block that registers the shutdown hook in {{Shell}}. We can
add this shutdown hook for the localizer via YARN-5461. Also added a javadoc for {{destroyAllProcesses}}.


> 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, HADOOP-13709.003.patch,
HADOOP-13709.004.patch, HADOOP-13709.005.patch, HADOOP-13709.006.patch, HADOOP-13709.007.patch,
HADOOP-13709.008.patch, HADOOP-13709.009.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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