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From "Brice Arnould (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1380) We should have a util.Subprocess class with utilities for starting subprocesses
Date Mon, 02 Jun 2008 09:31:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1380?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12601565#action_12601565
] 

Brice Arnould commented on HADOOP-1380:
---------------------------------------

It is. I didn't knew that bug.

If I undestand well, #2721 suggests that we should implements a functionality similar to this
one by a call in the child to setsid().

So there is two approaches :
 * #2721
We add a way for the child process to know the PID of it's TaskTracker. We export this PID
via the environement. The child process can then call setsid(atoi(getenv("TASKTRACKER_PID")))
if he wants to be killed when the TaskTracker dies.
Pro : We don't add a new class.
Cons : It's not portable (Posix only, not available on all languages) and requires an explicit
action of the user.

 * #1380
Pro : Portable, we could add a config option so the admin can choose whether child tasks are
killed by default or not.
Cons : Add more code in Hadoop.

I know that I have a bias for #1380, since I wrote it But it's fine for me if you rather #2721
;-)

> We should have a util.Subprocess class with utilities for starting subprocesses
> -------------------------------------------------------------------------------
>
>                 Key: HADOOP-1380
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1380
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: util
>            Reporter: Owen O'Malley
>            Assignee: Brice Arnould
>         Attachments: SubProcessesManager.patch, SubProcessesManager_v2.patch
>
>
> I'd like a utility class for launching subprocesses. In particular, I want there to be
a list of launched subprocesses and when the jvm is shutdown, a hook will destroy all of the
subprocesses. Otherwise, when a task is killed, the subprocesses continue on.

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