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From "He Yongqiang (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HIVE-759) add hive.intermediate.compression.codec option
Date Tue, 18 Aug 2009 07:41:14 GMT

     [ https://issues.apache.org/jira/browse/HIVE-759?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

He Yongqiang updated HIVE-759:
------------------------------

    Attachment: hive-759-2009-08-18-2.patch

talked with Zheng offline, and attached a new patch. Use hadoop's conf as default value, and
report error to user if user specified codec not found etc.

> 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
>         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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