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From Ravi Prakash <ravi...@ymail.com>
Subject Re: YARN tasks and child processes
Date Tue, 02 Jul 2013 15:55:22 GMT
Nopes! The node manager kills the entire process tree when the task reports that it is done.
Now if you were able to figure out a way for one of the children to break out of the process
tree, maybe?

However your approach is obviously not recommended. You would be stealing from the resources
that YARN should have available.

 From: John Lilley <john.lilley@redpoint.net>
To: "user@hadoop.apache.org" <user@hadoop.apache.org> 
Sent: Tuesday, July 2, 2013 10:41 AM
Subject: RE: YARN tasks and child processes

Thanks, this is also good information.  But I was really asking if a child *process* that
was spawned by a task can persist, in addition to the data.
From:Devaraj k [mailto:devaraj.k@huawei.com] 
Sent: Monday, July 01, 2013 11:50 PM
To: user@hadoop.apache.org
Subject: RE: YARN tasks and child processes
It is possible to persist the data by YARN task, you can choose whichever place you want to
If you choose to persist in HDFS, you need to take care deleting the data after using it.
 If you choose to write in local dir, you may write the data into the nm local dirs (i.e
‘yarn.nodemanager.local-dirs’ configuration) accordingly with the app id & container
id, and this will be cleaned up after the app completion.  You need to make use of this persisted
data before completing the application.
Devaraj k
From:John Lilley [mailto:john.lilley@redpoint.net] 
Sent: 02 July 2013 04:44
To: user@hadoop.apache.org
Subject: YARN tasks and child processes
Is it possible for a child process of a YARN task to persist after the task is complete? 
I am looking at an alternative to a YARN auxiliary process that may be simpler to implement,
if I can have a task spawn a process that persists for some time after the task finishes.
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