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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