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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1338) Recover localized resource cache state upon nodemanager restart
Date Thu, 29 May 2014 09:42:06 GMT

    [ https://issues.apache.org/jira/browse/YARN-1338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14012235#comment-14012235
] 

Junping Du commented on YARN-1338:
----------------------------------

bq. Good point. I added shutdown code that removes the recovery directory if the shutdown
is due to a decommission. I also added a unit test for this scenario.
Thanks for addressing my comments, Jason!
bq. The last component of localDir is the unique resource ID and not a directory managed by
the local cache directory manager.
I see. It is really confusing and we'd better put some documents somewhere (don't have to
be in this patch though given this is big enough).
I will review it again today.

> Recover localized resource cache state upon nodemanager restart
> ---------------------------------------------------------------
>
>                 Key: YARN-1338
>                 URL: https://issues.apache.org/jira/browse/YARN-1338
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: nodemanager
>    Affects Versions: 2.3.0
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>         Attachments: YARN-1338.patch, YARN-1338v2.patch, YARN-1338v3-and-YARN-1987.patch,
YARN-1338v4.patch, YARN-1338v5.patch, YARN-1338v6.patch
>
>
> Today when node manager restarts we clean up all the distributed cache files from disk.
This is definitely not ideal from 2 aspects.
> * For work preserving restart we definitely want them as running containers are using
them
> * For even non work preserving restart this will be useful in the sense that we don't
have to download them again if needed by future tasks.



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