Junping Du commented on YARN-1338:

Hi [~jlowe], thanks for contributing a patch here. Looks like the latest patch 
include some code in YARN-1987 which is already committed. Would you mind to 
update it so that I can start to review and comment? Thanks! 

> 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
> 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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