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https://issues.apache.org/jira/browse/HIVE-17113?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16107690#comment-16107690
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Jason Dere commented on HIVE-17113:
-----------------------------------
[~ashutoshc] can you review this one?
> Duplicate bucket files can get written to table by runaway task
> ---------------------------------------------------------------
>
> Key: HIVE-17113
> URL: https://issues.apache.org/jira/browse/HIVE-17113
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Reporter: Jason Dere
> Assignee: Jason Dere
> Attachments: HIVE-17113.1.patch, HIVE-17113.2.patch,
> HIVE-17113.3.patch
>
>
> Saw a table get a duplicate bucket file from a Hive query. It looks like the
> following happened:
> 1. Task attempt A_0 starts,but then stops making progress
> 2. The job was running with speculative execution on, and task attempt A_1 is
> started
> 3. Task attempt A_1 finishes execution and saves its output to the temp
> directory.
> 5. A task kill is sent to A_0, though this does appear to actually kill A_0
> 6. The job for the query finishes and Utilities.mvFileToFinalPath() calls
> Utilities.removeTempOrDuplicateFiles() to check for duplicate bucket files
> 7. A_0 (still running) finally finishes and saves its file to the temp
> directory. At this point we now have duplicate bucket files - oops!
> 8. Utilities.removeTempOrDuplicateFiles() moves the temp directory to the
> final location, where it is later moved to the partition directory.
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