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From "Mostafa Mokhtar (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-7992) StatsRulesProcFactory should gracefully handle overflows
Date Fri, 05 Sep 2014 01:32:24 GMT

     [ https://issues.apache.org/jira/browse/HIVE-7992?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mostafa Mokhtar updated HIVE-7992:
----------------------------------
    Description: 
When StatsRulesProcFactory overflows it sets data size to 0 and as a result the Vertex will
ask for a single task, this results in a fairly slow running query, most likely the overflow
is a result of higher than usual number of rows.

The class should detect an overflow and set a flag when an overflow occurs, if an overflow
occurs StatsRulesProcFactory should request the maximum number of tasks for the vertex.

  was:
When StatsRulesProcFactory overflows it sets data size to 0 and as a result the Vertex will
ask for a single task, this results in a fairly slow running query, most likely the overflow
is a result of higher than usual number of rows.

The class should detect an overflow and set a flag when an overflow occurs, if an overflow
occurs request the maximum number of tasks for the vertex.


> StatsRulesProcFactory should gracefully handle overflows
> --------------------------------------------------------
>
>                 Key: HIVE-7992
>                 URL: https://issues.apache.org/jira/browse/HIVE-7992
>             Project: Hive
>          Issue Type: Bug
>          Components: Statistics
>    Affects Versions: 0.13.1
>            Reporter: Mostafa Mokhtar
>            Assignee: Prasanth J
>              Labels: performance
>             Fix For: 0.14.0
>
>
> When StatsRulesProcFactory overflows it sets data size to 0 and as a result the Vertex
will ask for a single task, this results in a fairly slow running query, most likely the overflow
is a result of higher than usual number of rows.
> The class should detect an overflow and set a flag when an overflow occurs, if an overflow
occurs StatsRulesProcFactory should request the maximum number of tasks for the vertex.



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