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https://issues.apache.org/jira/browse/HIVE-2125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13024994#comment-13024994
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jirapos...@reviews.apache.org commented on HIVE-2125:
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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/665/
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Review request for hive.
Summary
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alter table concatenate fails and deletes data
It is because the number of reducers is set to -1.
In this patch, it is set to zero.
Also added a move task as the child task of the merge task. added a conf to
control whether to check index or not, and add the job name for the merge job.
This addresses bug HIVE-2125.
https://issues.apache.org/jira/browse/HIVE-2125
Diffs
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trunk/common/src/java/org/apache/hadoop/hive/conf/HiveConf.java 1096599
trunk/conf/hive-default.xml 1096599
trunk/ql/src/java/org/apache/hadoop/hive/ql/exec/DDLTask.java 1096599
trunk/ql/src/java/org/apache/hadoop/hive/ql/exec/Task.java 1096599
trunk/ql/src/java/org/apache/hadoop/hive/ql/io/rcfile/merge/BlockMergeTask.java
1096599
trunk/ql/src/java/org/apache/hadoop/hive/ql/parse/DDLSemanticAnalyzer.java
1096599
trunk/ql/src/test/queries/clientnegative/alter_merge_index.q PRE-CREATION
trunk/ql/src/test/queries/clientpositive/alter_merge_index.q PRE-CREATION
trunk/ql/src/test/results/clientnegative/alter_merge_index.q.out PRE-CREATION
trunk/ql/src/test/results/clientpositive/alter_merge_index.q.out PRE-CREATION
Diff: https://reviews.apache.org/r/665/diff
Testing
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Thanks,
Yongqiang
> 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
>
>
> 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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