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Posted to issues@hive.apache.org by "Prasanth Jayachandran (JIRA)" <ji...@apache.org> on 2017/08/29 02:01:08 UTC
[jira] [Commented] (HIVE-17403) Fail concatenation for unmanaged
tables
[ https://issues.apache.org/jira/browse/HIVE-17403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16144653#comment-16144653 ]
Prasanth Jayachandran commented on HIVE-17403:
----------------------------------------------
This could happen for managed tables as well since hive supports "LOAD DATA" commands.
> Fail concatenation for unmanaged tables
> ---------------------------------------
>
> Key: HIVE-17403
> URL: https://issues.apache.org/jira/browse/HIVE-17403
> Project: Hive
> Issue Type: Bug
> Affects Versions: 1.3.0, 3.0.0, 2.4.0
> Reporter: Prasanth Jayachandran
> Assignee: Prasanth Jayachandran
> Priority: Blocker
>
> ALTER TABLE .. CONCATENATE should fail if the table is not managed by hive.
> For unmanaged tables, file names can be anything. Hive has some assumptions about file names which can result in data loss for unmanaged tables.
> Example of this is a table/partition having 2 different files files (part-m-00000__1417075294718 and part-m-00018__1417075294718). Although both are completely different files, hive thinks these are files generated by separate instances of same task (because of failure or speculative execution). Hive will end up removing this file
> {code}
> 2017-08-28T18:19:29,516 WARN [b27f10d5-d957-4695-ab2a-1453401793df main]: exec.Utilities (:()) - Duplicate taskid file removed: file:/Users/table/part=20141120/.hive-staging_hive_2017-08-28_18-19-27_210_3381701454205724533-1/_tmp.-ext-10000/part-m-00018__1417075294718 with length 958510. Existing file: file:/Users/table/part=20141120/.hive-staging_hive_2017-08-28_18-19-27_210_3381701454205724533-1/_tmp.-ext-10000/part-m-00000__1417075294718 with length 1123116
> {code}
> DDL should restrict concatenation for unmanaged tables.
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