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From "Karthik Kambatla (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1492) truly shared cache for jars (jobjar/libjar)
Date Thu, 06 Mar 2014 06:29:51 GMT

    [ https://issues.apache.org/jira/browse/YARN-1492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13922063#comment-13922063
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Karthik Kambatla commented on YARN-1492:
----------------------------------------

Thanks [~ctrezzo] for the clarifications. Look forward to the development, now that most of
the design is clear. Do you want to go ahead and create sub-tasks? 

bq. We are also planning to have a local store as well (leveraging something like LevelDB
or HSQLDB).
Good idea to begin with LevelDB, and add a ZK-based implementation if/when we need it. We
can make the store pluggable. 

> 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: Sangjin Lee
>         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
>
>
> 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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