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From "Phabricator (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-2471) Add timestamp column to the partition stats table.
Date Fri, 16 Mar 2012 20:39:40 GMT

    [ https://issues.apache.org/jira/browse/HIVE-2471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13231603#comment-13231603
] 

Phabricator commented on HIVE-2471:
-----------------------------------

njain has commented on the revision "HIVE-2471 [jira] Add timestamp column with index to the
partition stats table.".

INLINE COMMENTS
  ql/src/java/org/apache/hadoop/hive/ql/stats/jdbc/JDBCStatsSetupConstants.java:26 Write a
big comment here that it is the users responsibility
  to delete the old table
  ql/src/java/org/apache/hadoop/hive/ql/stats/jdbc/JDBCStatsUtils.java:128 I am not sure this
will work -
  I am assuming this is invoked by StatsAggregator, but the data is
  inserted by StatsPublisher.

  The timestamp will be different in the 2 places

REVISION DETAIL
  https://reviews.facebook.net/D2367

                
> Add timestamp column to the partition stats table.
> --------------------------------------------------
>
>                 Key: HIVE-2471
>                 URL: https://issues.apache.org/jira/browse/HIVE-2471
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Kevin Wilfong
>            Assignee: Kevin Wilfong
>         Attachments: HIVE-2471.1.patch.txt, HIVE-2471.D2367.1.patch, HIVE-2471.D2367.2.patch
>
>
> Occasionally, when entries are added to the partition stats table the program is halted
before it can delete those entries, by an exception, keyboard interrupt, etc.  These build
up to the point where the table gets very large, and it hurts the performance of the update
statement which is often called.  In order to fix this, I am adding a column to the table
which is auto-populated with the current timestamp.  This will allow us to create scripts
that go through periodically and clean out old entries from the table.

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