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From "Namit Jain (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-964) handle skewed keys for a join in a separate job
Date Fri, 15 Jan 2010 18:20:54 GMT

    [ https://issues.apache.org/jira/browse/HIVE-964?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12800811#action_12800811
] 

Namit Jain commented on HIVE-964:
---------------------------------

A subtask of a conditional task cannot be a root stage.
Change "is constitued of" by "consists of"
The output of child tasks of condition tasks is	emitted twice (they should not be emitted
while
displaying conditional task).

Also, can you file follow-up jiras ?

Otherwise, it is OK for me.

Ning, can you also take a look again and approve it.

> handle skewed keys for a join in a separate job
> -----------------------------------------------
>
>                 Key: HIVE-964
>                 URL: https://issues.apache.org/jira/browse/HIVE-964
>             Project: Hadoop Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: Namit Jain
>            Assignee: He Yongqiang
>         Attachments: hive-964-2009-12-17.txt, hive-964-2009-12-28-2.patch, hive-964-2009-12-29-4.patch,
hive-964-2010-01-08.patch, hive-964-2010-01-13-2.patch, hive-964-2010-01-14-3.patch
>
>
> The skewed keys can be written to a temporary table or file, and a followup conditional
task can be used to perform the join on those keys.
> As a first step, JDBM can be used for those keys

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