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From "Dhruv Kumar (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-8705) Add JSR 107 Caching support
Date Wed, 15 Aug 2012 19:59:38 GMT
Dhruv Kumar created HADOOP-8705:

             Summary: Add JSR 107 Caching support 
                 Key: HADOOP-8705
                 URL: https://issues.apache.org/jira/browse/HADOOP-8705
             Project: Hadoop Common
          Issue Type: Improvement
            Reporter: Dhruv Kumar

Having a cache on mappers and reducers could be very useful for some use cases, including
but not limited to:

1. Iterative Map Reduce Programs: Some machine learning algorithms frequently need access
to invariant data (see Mahout) over each iteration of MapReduce until convergence. A cache
on such nodes could allow easy access to the hotset of data without going all the way to the
distributed cache.

2. Storing of intermediate map and reduce outputs in memory to reduce shuffling time. This
optimization has been discussed at length in Haloop (http://www.ics.uci.edu/~yingyib/papers/HaLoop_camera_ready.pdf).

There are some other scenarios as well where having a cache could come in handy. 

It will be nice to have some sort of pluggable support for JSR 107 compliant caches. 
. Now that JSR 107 is a caching standard, it will be nice

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