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From "Kevin Wilfong (Commented) (JIRA)" <>
Subject [jira] [Commented] (HIVE-2471) Add timestamp column with index to the partition stats table.
Date Fri, 16 Mar 2012 18:21:40 GMT


Kevin Wilfong commented on HIVE-2471:

Given the issues we have seen in the past with indexes on this table, I have decided not to
add an index on the timestamp column.
> Add timestamp column with index to the partition stats table.
> -------------------------------------------------------------
>                 Key: HIVE-2471
>                 URL:
>             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.  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.

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