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From "Ning Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-2127) Improve stats gathering reliability by retries on failures
Date Wed, 27 Apr 2011 05:30:03 GMT

    [ https://issues.apache.org/jira/browse/HIVE-2127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13025615#comment-13025615
] 

Ning Zhang commented on HIVE-2127:
----------------------------------

@Namit, what does the new configuration variable do? Do you mean to define a variable to disable
retry? If so set hive.stats.retries.max = 0 will do.

> Improve stats gathering reliability by retries on failures
> ----------------------------------------------------------
>
>                 Key: HIVE-2127
>                 URL: https://issues.apache.org/jira/browse/HIVE-2127
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Ning Zhang
>            Assignee: Ning Zhang
>         Attachments: HIVE-2127.2.patch, HIVE-2127.patch
>
>
> Stats publishing and aggregation only try once and if there is any exception it will
fail and return. If many mappers/reducers updating stats at the same time, it is very common
to get lock timeout. We should make stats more reliable by retry when there is an SQLException.

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