[jira] Commented: (HIVE-1394) do not update transient_lastDdlTime if the partition is modified by a housekeeping operation

["John Sichi (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-1394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12885680#action_12885680 ] 

John Sichi commented on HIVE-1394:
----------------------------------

Note HIVE-1442, which prevents this feature from being used.  Also, someone needs to document it.


> do not update transient_lastDdlTime if the partition is modified by a housekeeping operation
> --------------------------------------------------------------------------------------------
>
>                 Key: HIVE-1394
>                 URL: https://issues.apache.org/jira/browse/HIVE-1394
>             Project: Hadoop Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: Namit Jain
>            Assignee: Ning Zhang
>             Fix For: 0.7.0
>
>         Attachments: HIVE-1394.2.patch, HIVE-1394.patch
>
>
> Currently. purging looks at the hdfs time to see the last time the files got modified.
> It should look at the metastore property instead - these are facebook specific utilities, which do not require any changes to hive.
> However, in some cases, the operation might be performed by some housekeeping job, which should not modify the timestamp.
> Since, hive has no way of knowing the origin of the query, it might be a good idea to add a new hint which specifies that the 
> operation is a cleanup operation, and the timestamp in the metastore need not be touched for that scenario.

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