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From "Kevin Wilfong (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-2471) Add timestamp column to the partition stats table.
Date Fri, 16 Mar 2012 18:21:41 GMT

     [ 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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