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From "Chris Trezzo (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (YARN-1492) truly shared cache for jars (jobjar/libjar)
Date Thu, 05 Oct 2017 18:46:05 GMT

     [ https://issues.apache.org/jira/browse/YARN-1492?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris Trezzo resolved YARN-1492.
--------------------------------
       Resolution: Fixed
    Fix Version/s: 3.0.0
                   2.9.0

I am resolving this issue as all the parts are committed to trunk, branch-3.0 and branch-2.
Thanks everyone who helped with reviews and design feedback! I am glad to see this feature
reach this milestone. I am also looking forward to collaborating on shared cache phase two
features in YARN-7282.

> 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
>             Fix For: 2.9.0, 3.0.0
>
>         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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