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From "Dave Lerman (JIRA)" <j...@apache.org>
Subject [jira] Created: (HIVE-1007) CombinedHiveInputFormat fails with empty input
Date Tue, 22 Dec 2009 15:20:29 GMT
CombinedHiveInputFormat fails with empty input
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                 Key: HIVE-1007
                 URL: https://issues.apache.org/jira/browse/HIVE-1007
             Project: Hadoop Hive
          Issue Type: Bug
          Components: Query Processor
    Affects Versions: 0.4.1
            Reporter: Dave Lerman
         Attachments: hive.1007.1.patch

In a multi-stage query, when one stage returns no data (resulting in a bunch of output files
with size 0), the next stage creates a job with 0 mappers which just sits in the Hadoop task
track forever and hangs the query at 0%.  The issue is that CombineHiveInputFormat looks for
blocks to populate splits, find nones (since input is all 0 bytes), and then returns an empty
array from getSplits.

There may be good a way to just skip that job altogether, but as a quick hack to get it working,
when there are no splits, I just create a single empty one using the first path so that the
job doesn't hang.

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