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From "Sunil G (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4494) Recover completed apps asynchronously
Date Wed, 18 May 2016 13:31:12 GMT

    [ https://issues.apache.org/jira/browse/YARN-4494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15288950#comment-15288950
] 

Sunil G commented on YARN-4494:
-------------------------------

Hi [~kasha]

As per the problem statement, if we are starting to recover complete apps asynchronously,
we may not know when this recovery will be completed. So if we are getting a query  (getApplication/Attempt
etc) during this brief recovery period, we could immediately try to recover the queried app
from client (also by blocking the client rpc call), and serve the metrics/state etc. 

So it wont be a lazy recover when there is a request, we can immediately recover and serve
it. 

bq.If yes, do we recover everything when someone requests all apps? How about apps that match
a specific category?
I was thinking in same line early. But we may block the client call for a long time here till
all apps are recovered. There are two options here, 1) block the client call till all apps
are recovered (it may be too long, and timeour may happen) 2) error message/exception can
be thrown to client indicating that recovery is in progress.
Both these are not very clean solutions. But we have seen some de-merits of recovering completed
apps (in case of thousands of completed apps). TO avoid this issue, max-completed applications
were configured lesser. cc/[~rohithsharma]

[~kasha], pls share your thoughts. 

> Recover completed apps asynchronously
> -------------------------------------
>
>                 Key: YARN-4494
>                 URL: https://issues.apache.org/jira/browse/YARN-4494
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: resourcemanager
>            Reporter: Jun Gong
>            Assignee: Jun Gong
>
> With RM HA enabled, when recovering apps, recover completed apps asynchronously.



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