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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