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From "Todd Lipcon (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-3169) Create a new MiniMRCluster equivalent which only provides client APIs cross MR1 and MR2
Date Tue, 11 Oct 2011 18:55:11 GMT
Create a new MiniMRCluster equivalent which only provides client APIs cross MR1 and MR2
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                 Key: MAPREDUCE-3169
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3169
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: mrv1, mrv2, test
    Affects Versions: 0.23.0
            Reporter: Todd Lipcon


Many dependent projects like HBase, Hive, Pig, etc, depend on MiniMRCluster for writing tests.
Many users do as well. MiniMRCluster, however, exposes MR implementation details like the
existence of TaskTrackers, JobTrackers, etc, since it was used by MR1 for testing the server
implementations as well.

This JIRA is to create a new interface which could be implemented either by MR1 or MR2 that
exposes only the client-side portions of the MR framework. Ideally it would be "recompile-compatible"
with MiniMRCluster for most applications, and the MR1 implementation could be backported to
20x branch. Thus, dependent projects like HBase could migrate to this implementation and test
against both MR1 and MR2. We can also use this to port over the current functional tests that
use only the client-side features of MiniMRCluster.

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