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From "Samuel Guo (JIRA)" <>
Subject [jira] Commented: (HIVE-759) add hive.intermediate.compression.codec option
Date Wed, 19 Aug 2009 05:27:14 GMT


Samuel Guo commented on HIVE-759:

It seems that LzoCodec is removed from hadoop 0.20.0.

the new patch will fail compiling hive with hadoop 0.20.0. 

> add hive.intermediate.compression.codec option
> ----------------------------------------------
>                 Key: HIVE-759
>                 URL:
>             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
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.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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