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From "Yuri Pradkin (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-4688) multiple spills/reducers test case for mergeParts() needed
Date Wed, 19 Nov 2008 19:02:44 GMT
multiple spills/reducers test case for mergeParts() needed

                 Key: HADOOP-4688
                 URL: https://issues.apache.org/jira/browse/HADOOP-4688
             Project: Hadoop Core
          Issue Type: Test
          Components: mapred
    Affects Versions: 0.19.1
            Reporter: Yuri Pradkin

The first  patch version (incorrect) for http://issues.apache.org/jira/browse/HADOOP-4614
exposed a problem that existing tests do not exercise some code paths of MapOutputBuffer::mergeParts().
 In particular, we need a test that would validate output when numSpills >1 and partitions

This might be a test that has more than 1 reducer and forces multiple first level (map) spills
by setting *io.sort.mb* (and possibly *io.sort.spill.percent*) to small values.

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