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https://issues.apache.org/jira/browse/HIVE-2125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13025639#comment-13025639
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Ning Zhang commented on HIVE-2125:
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The new patch looks good to me and addressed most of Carl's comments.
Also about comments in the test .q files, I'm aware of the bug Yongqiang
mentioned (test failed in some cases if comments are present, but passed
otherwise). We should fix that bug in QTestsUtil and make a group effort to add
comments to .q files as much as possible. Carl, what do you think?
> 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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