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From "Namit Jain (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-1509) Monitor the working set of the number of files
Date Wed, 04 Aug 2010 00:32:21 GMT

    [ https://issues.apache.org/jira/browse/HIVE-1509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12895106#action_12895106
] 

Namit Jain commented on HIVE-1509:
----------------------------------

With dynamic partitions, the number of intermediate files can grow very fast.

For example, consider a query with 10,000 mappers and 100 files per mapper - it can create
up to 1 million files before merging them at the end.
The cluster may be down by the time the query finishes.

It is a good idea to track the number of files through a counter, and kill the query if the
number exceeds a given threshold


> Monitor the working set of the number of files 
> -----------------------------------------------
>
>                 Key: HIVE-1509
>                 URL: https://issues.apache.org/jira/browse/HIVE-1509
>             Project: Hadoop Hive
>          Issue Type: Bug
>          Components: Query Processor
>    Affects Versions: 0.7.0
>            Reporter: Namit Jain
>            Assignee: Ning Zhang
>


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