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From "Zhenxiao Luo (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-3952) In MR2, when Total input paths to process == 1, CombinefileInputFormat.getSplits() returns 0 split.
Date Thu, 01 Mar 2012 05:12:06 GMT
In MR2, when Total input paths to process == 1, CombinefileInputFormat.getSplits() returns
0 split.
---------------------------------------------------------------------------------------------------

                 Key: MAPREDUCE-3952
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3952
             Project: Hadoop Map/Reduce
          Issue Type: Bug
            Reporter: Zhenxiao Luo


Hive get unexpected result when using MR2(When using MR1, always get expected result).

In MR2, when Total input paths to process == 1, CombinefileInputFormat.getSplits() returns
0 split.

The calling code in Hive, in Hadoop23Shims.java:

InputSplit[] splits = super.getSplits(job, numSplits);

this get splits.length == 0.

In MR1, everything goes fine, the calling code in Hive, in Hadoop20Shims.java:

CombineFileSplit[] splits = (CombineFileSplit[]) super.getSplits(job, numSplits);

this get splits.length == 1.

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