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Date: Tue, 5 Jul 2011 18:27:16 +0000 (UTC)
From: "Vaibhav Aggarwal (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
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Subject: [jira] [Assigned] (HIVE-2195) Hive queries hangs with first stage
 job created with zero mappers and 1 reducer,
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     [ https://issues.apache.org/jira/browse/HIVE-2195?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vaibhav Aggarwal reassigned HIVE-2195:
--------------------------------------

    Assignee: Vaibhav Aggarwal

> Hive queries hangs with first stage job created with zero mappers and 1 reducer,  
> ----------------------------------------------------------------------------------
>
>                 Key: HIVE-2195
>                 URL: https://issues.apache.org/jira/browse/HIVE-2195
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 0.7.0
>            Reporter: vitthal (Suhas) Gogate
>            Assignee: Vaibhav Aggarwal
>
> This happens when query aggregate data w/ predicate selecting bunch of non-existing data partitions. 
> e,g, Table XXX has five columns,  A (int), B (int), C(string), date (int) and hour (int), where date/hour are the partition columns, 
> select cast((100*date+hour) as BIGINT) as datehour, sum(A) as sumA,
> sum(B) as sumB from XXX where date>=20110925 and C='test' group by date, hour order by datehour  
> In the above query, make a note that selected date partition range does not exists in hive table i.e. no date partitions for date>=20110925
> The above query hangs with the first map reduce job it creates, with zero mappers and 1 reducer.

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