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From "Arun Suresh (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-7086) Release all containers aynchronously
Date Wed, 23 Aug 2017 18:28:00 GMT
Arun Suresh created YARN-7086:
---------------------------------

             Summary: Release all containers aynchronously
                 Key: YARN-7086
                 URL: https://issues.apache.org/jira/browse/YARN-7086
             Project: Hadoop YARN
          Issue Type: Bug
          Components: resourcemanager
            Reporter: Arun Suresh
            Assignee: Arun Suresh


We have noticed in production two situations that can cause deadlocks and cause scheduling
of new containers to come to a halt, especially with regard to applications that have a lot
of live containers:
# When these applicaitons release these containers in bulk.
# When these applications terminate abruptly due to some failure, the scheduler releases all
its live containers in a loop.

To handle the issues mentioned above, we have a patch in production to make sure ALL container
releases happen asynchronously - and it has served us well.

Opening this JIRA to gather feedback on if this is a good idea generally (cc [~leftnoteasy],
[~jlowe], [~curino], [~kasha], [~subru], [~roniburd])

BTW, In YARN-6251, we already have an asyncReleaseContainer() in the AbstractYarnScheduler
and a corresponding scheduler event, which is currently used specifically for the container-update
code paths (where the scheduler realeases temp containers which it creates for the update)





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