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Posted to mapreduce-dev@hadoop.apache.org by "Zhenxiao Luo (Created) (JIRA)" <ji...@apache.org> on 2012/03/01 06:12:06 UTC
[jira] [Created] (MAPREDUCE-3952) In MR2, when Total input paths to
process == 1, CombinefileInputFormat.getSplits() returns 0 split.
In MR2, when Total input paths to process == 1, CombinefileInputFormat.getSplits() returns 0 split.
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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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