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Posted to dev@hive.apache.org by "Kevin Wilfong (Updated) (JIRA)" <ji...@apache.org> on 2012/03/16 19:21:41 UTC
[jira] [Updated] (HIVE-2471) Add timestamp column to the partition stats table.

     [ https://issues.apache.org/jira/browse/HIVE-2471?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kevin Wilfong updated HIVE-2471:
--------------------------------

    Description: 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.  I am also adding an index on this column.  This will allow us to create scripts that go through periodically and clean out old entries from the table.  (was: 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.  I am also adding an index on this column.  This will allow us to create scripts that go through periodically and clean out old entries from the table.  The index will help to keep the runtime of these scripts short, and hence reduce the amount of time they need to lock the table/indexes for.)
        Summary: Add timestamp column to the partition stats table.  (was: Add timestamp column with index to the partition stats table.)
    
> 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
>
>
> 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.  I am also adding an index on this column.  This will allow us to create scripts that go through periodically and clean out old entries from the table.

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