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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9639) truly shared cache for jars (jobjar/libjar)
Date Wed, 12 Jun 2013 04:27:22 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9639?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13680935#comment-13680935
] 

Chris Nauroth commented on HADOOP-9639:
---------------------------------------

Thanks, Sangjin.  That makes sense.  It sounds then like this is a feature request for MRv2
to leverage the full range of local resource visibility settings offered by YARN, and expose
that to end users submitting the MR jobs.
                
> truly shared cache for jars (jobjar/libjar)
> -------------------------------------------
>
>                 Key: HADOOP-9639
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9639
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: filecache
>    Affects Versions: 2.0.4-alpha
>            Reporter: Sangjin Lee
>
> 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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