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https://issues.apache.org/jira/browse/YARN-1492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14048444#comment-14048444
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Chris Trezzo commented on YARN-1492:
------------------------------------

All patches for the shared cache have now been posted. Please let me know if I 
can do anything else to facilitate code reviews and make the review process as 
easy as possible. Thanks in advance!

> truly shared cache for jars (jobjar/libjar)
> -------------------------------------------
>
>                 Key: YARN-1492
>                 URL: https://issues.apache.org/jira/browse/YARN-1492
>             Project: Hadoop YARN
>          Issue Type: New Feature
>    Affects Versions: 2.0.4-alpha
>            Reporter: Sangjin Lee
>            Assignee: Chris Trezzo
>         Attachments: YARN-1492-all-trunk-v1.patch, shared_cache_design.pdf, 
> shared_cache_design_v2.pdf, shared_cache_design_v3.pdf, 
> shared_cache_design_v4.pdf, shared_cache_design_v5.pdf
>
>
> Currently there is the distributed cache that enables you to cache jars and 
> files so that attempts from the same job can reuse them. However, sharing is 
> limited with the distributed cache because it is normally on a per-job basis. 
> On a large cluster, sometimes copying of jobjars and libjars becomes so 
> prevalent that it consumes a large portion of the network bandwidth, not to 
> speak of defeating the purpose of "bringing compute to where data is". This 
> is wasteful because in most cases code doesn't change much across many jobs.
> I'd like to propose and discuss feasibility of introducing a truly shared 
> cache so that multiple jobs from multiple users can share and cache jars. 
> This JIRA is to open the discussion.



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