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From "Zheng Shao (JIRA)" <j...@apache.org>
Subject [jira] Created: (HIVE-759) add hive.intermediate.compression.codec option
Date Sun, 16 Aug 2009 00:23:14 GMT
add hive.intermediate.compression.codec option
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                 Key: HIVE-759
                 URL: https://issues.apache.org/jira/browse/HIVE-759
             Project: Hadoop Hive
          Issue Type: Improvement
          Components: Query Processor
            Reporter: Zheng Shao


Hive uses the jobconf compression codec for all map-reduce jobs. This includes both mapred.map.output.compression.codec
and mapred.output.compression.codec.

In some cases, we want to distinguish between the codec used for intermediate map-reduce jobs
(that produces intermediate data between jobs) and the final map-reduce jobs (that produces
data stored in tables).

For intermediate data, lzo might be a better fit because it's much faster; for final data,
gzip might be a better fit because it saves disk spaces.

We should introduce two new options:
{code}
hive.intermediate.compression.codec=org.apache.hadoop.io.compress.LzoCodec
hive.intermediate.compression.type=BLOCK
{code}
And use these 2 options to override the mapred.output.compression.* in the FileSinkOperator
that produces intermediate data.

Note that it's possible that a single map-reduce job may have 2 FileSInkOperators: one produces
intermediate data, and one produces final data. So we need to add a flag to fileSinkDesc for
that.


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