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From "Sangjin Lee (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-9639) truly shared cache for jars (jobjar/libjar)
Date Tue, 11 Jun 2013 20:01:21 GMT
Sangjin Lee created HADOOP-9639:

             Summary: 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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