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Date: Wed, 27 Apr 2011 21:00:03 +0000 (UTC)
From: "Ning Zhang (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
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Subject: [jira] [Commented] (HIVE-2125) alter table concatenate fails and
 deletes data
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    [ https://issues.apache.org/jira/browse/HIVE-2125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13026007#comment-13026007 ] 

Ning Zhang commented on HIVE-2125:
----------------------------------

All unit tests passed. 

@Carl, do you have further comments? If you are +1 we can open a separate JIRA to fix the comment bug in .q files. 

> alter table concatenate fails and deletes data
> ----------------------------------------------
>
>                 Key: HIVE-2125
>                 URL: https://issues.apache.org/jira/browse/HIVE-2125
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Joydeep Sen Sarma
>            Assignee: He Yongqiang
>            Priority: Critical
>         Attachments: HIVE-2125.1.patch, HIVE-2125.2.patch
>
>
> the number of reducers is not set by this command (unlike other hive queries). since mapred.reduce.tasks=-1 (to let hive infer this automatically) - jobtracker fails the job (number of reducers cannot be negative)
> hive> alter table ad_imps_2 partition(ds='2009-06-16') concatenate;
> alter table ad_imps_2 partition(ds='2009-06-16') concatenate;
> Starting Job = job_201103101203_453180, Tracking URL = http://curium.data.facebook.com:50030/jobdetails.jsp?jobid=job_201103101203_453180
> Kill Command = /mnt/vol/hive/sites/curium/hadoop/bin/../bin/hadoop job  -Dmapred.job.tracker=curium.data.facebook.com:50029 -kill job_201103101203_453180
> Hadoop job information for null: number of mappers: 0; number of reducers: 0
> 2011-04-22 10:21:24,046 null map = 100%,  reduce = 100%
> Ended Job = job_201103101203_453180 with errors
> Moved to trash: /user/facebook/warehouse/ad_imps_2/_backup.ds=2009-06-16
> after the job fails - the partition is deleted
> thankfully it's still in trash

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