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Date: Fri, 8 Nov 2013 07:39:18 +0000 (UTC)
From: "Ashutosh Chauhan (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
Message-ID: <JIRA.12622858.1354855000253.41134.1383896358557@arcas>
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Subject: [jira] [Updated] (HIVE-3777) add a property in the partition to
 figure out if stats are accurate
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     [ https://issues.apache.org/jira/browse/HIVE-3777?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ashutosh Chauhan updated HIVE-3777:
-----------------------------------

    Status: Open  (was: Patch Available)

> add a property in the partition to figure out if stats are accurate
> -------------------------------------------------------------------
>
>                 Key: HIVE-3777
>                 URL: https://issues.apache.org/jira/browse/HIVE-3777
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>    Affects Versions: 0.13.0
>            Reporter: Namit Jain
>            Assignee: Ashutosh Chauhan
>         Attachments: HIVE-3777.2.patch, HIVE-3777.2.patch, HIVE-3777.3.patch, HIVE-3777.4.patch, HIVE-3777.patch
>
>
> Currently, stats task tries to update the statistics in the table/partition
> being updated after the table/partition is loaded. In case of a failure to 
> update these stats (due to the any reason), the operation either succeeds
> (writing inaccurate stats) or fails depending on whether hive.stats.reliable
> is set to true. This can be bad for applications who do not always care about
> reliable stats, since the query may have taken a long time to execute and then
> fail eventually.
> Another property should be added to the partition: areStatsAccurate. If hive.stats.reliable is
> set to false, and stats could not be computed correctly, the operation would
> still succeed, update the stats, but set areStatsAccurate to false.
> If the application cares about accurate stats, it can be obtained in the 
> background.


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