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From "Kevin Wilfong (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-3477) Duplicate data possible with speculative execution for dynamic partitions
Date Thu, 20 Sep 2012 01:04:07 GMT

     [ https://issues.apache.org/jira/browse/HIVE-3477?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kevin Wilfong updated HIVE-3477:
--------------------------------

       Resolution: Fixed
    Fix Version/s: 0.10.0
           Status: Resolved  (was: Patch Available)

Committed, thanks 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
>             Fix For: 0.10.0
>
>         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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