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https://issues.apache.org/jira/browse/HIVE-3477?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13457933#comment-13457933
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Kevin Wilfong commented on HIVE-3477:
-------------------------------------
+1 Nice catch Namit.
> Duplicate data possible with speculative execution for dynamic partitions
> -------------------------------------------------------------------------
>
> Key: HIVE-3477
> URL: https://issues.apache.org/jira/browse/HIVE-3477
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Reporter: Namit Jain
> Assignee: Namit Jain
> Attachments: hive.3477.1.patch
>
>
> Consider a query like:
> insert overwrite T partition (ds)
> select * from
> (mapreduce-subq1
> union all
> mapreduce-subq2)x;
> Once, mapreduce-subq1 and mapreduce-subq2 are done, the task for the union
> is invoked. At the end of the union task, jobClose is invoked.
> Note that there are 2 tablescan operators. The tree is something like:
> TABLESCAN1 --
> \
> UNION -- SELECT -- FILESINK
> /
> TABLESCAN2 --
> In the current setup, jobClose will be invoked twice for FileSink.
> In case of speculative execution, it is possible that data is still is
> being written to tmp Dir. after jobClose is finished once.
> The correct fix would be to make sure that jobClose is only invoked once.
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