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https://issues.apache.org/jira/browse/HIVE-759?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zheng Shao resolved HIVE-759.
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Resolution: Fixed
Fix Version/s: 0.5.0
Release Note: HIVE-759. Add "hive.intermediate.compression.codec/type"
option. (Yongqiang He via zshao)
Hadoop Flags: [Reviewed]
Committed. Thanks Yongqiang.
> add hive.intermediate.compression.codec option
> ----------------------------------------------
>
> Key: HIVE-759
> URL: https://issues.apache.org/jira/browse/HIVE-759
> Project: Hadoop Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Zheng Shao
> Assignee: He Yongqiang
> Fix For: 0.5.0
>
> Attachments: hive-759-2009-08-17.patch, hive-759-2009-08-18-2.patch,
> hive-759-2009-08-18.patch
>
>
> 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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