[jira] [Commented] (YARN-1492) truly shared cache for jars (jobjar/libjar)

["Chris Trezzo (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-1492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16188801#comment-16188801 ] 

Chris Trezzo commented on YARN-1492:
------------------------------------

[~asuresh] [~subru] I have set the target version for this jira back to 2.9.0. The only jira that is left for this first phase is the documentation patch and YARN-4858. Both should be able to make 2.9.0. The rest of the feature is already in branch-2. I have split out some of the major features that still need to be finished in the shared cache into a phase 2 jira (YARN-7282). That being said, the core parts of this feature are committed and ready to be used in deployments that do not need phase 2 features.

> 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: shared_cache_design.pdf, shared_cache_design_v2.pdf, shared_cache_design_v3.pdf, shared_cache_design_v4.pdf, shared_cache_design_v5.pdf, shared_cache_design_v6.pdf, YARN-1492-all-trunk-v1.patch, YARN-1492-all-trunk-v2.patch, YARN-1492-all-trunk-v3.patch, YARN-1492-all-trunk-v4.patch, YARN-1492-all-trunk-v5.patch
>
>
> 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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