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From "Namit Jain (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-1602) List Partitioning
Date Fri, 27 Aug 2010 21:51:53 GMT

    [ https://issues.apache.org/jira/browse/HIVE-1602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12903662#action_12903662
] 

Namit Jain commented on HIVE-1602:
----------------------------------

I don't think it has anything to do with dynamic partitioning.
It is a scheme to reduce the number of partitions/files in the presence of many small partitions

> List Partitioning
> -----------------
>
>                 Key: HIVE-1602
>                 URL: https://issues.apache.org/jira/browse/HIVE-1602
>             Project: Hadoop Hive
>          Issue Type: New Feature
>    Affects Versions: 0.7.0
>            Reporter: Ning Zhang
>
> Dynamic partition inserts create partitions bases on the dynamic partition column values.
Currently it creates one partition for each distinct DP column value. This could result in
skews in the created dynamic partitions in that some partitions are large but there could
be large number of small partitions as well. This results in burdens in HDFS as well as metastore.
A list partitioning scheme that aggregate a number of small partitions into one big one is
more preferable for skewed partitions. 

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