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Posted to mapreduce-dev@hadoop.apache.org by "Mitch McCuiston (JIRA)" <ji...@apache.org> on 2011/06/10 17:58:58 UTC

[jira] [Created] (MAPREDUCE-2583) DistributedCache for M-R chains

DistributedCache for M-R chains
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                 Key: MAPREDUCE-2583
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2583
             Project: Hadoop Map/Reduce
          Issue Type: New Feature
            Reporter: Mitch McCuiston


Currently the DistributedCache appears to be created at the granularity of a job.  In the case of a M-R chain, it is sometimes useful to share information out-of-band (as small files in hdfs) with each task in the chain.  For instance, the first M-R phase within a two-phase M-R chain might produce useful statistics that could be used to configure the second phase.

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