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From "Ning Zhang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-865) mapjoin: memory leak for same key with very large number of values
Date Fri, 02 Oct 2009 18:45:23 GMT

    [ https://issues.apache.org/jira/browse/HIVE-865?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12761667#action_12761667
] 

Ning Zhang commented on HIVE-865:
---------------------------------

The mem leak turns out to be caused by the MRU cache manager in JDBM. Currently Hive caches
25000 rows in JDBM through MapJoin by default. I changed it to 1 and it seems works fine.
I'll looking into MRU.

> mapjoin: memory leak for same key with very large number of values
> ------------------------------------------------------------------
>
>                 Key: HIVE-865
>                 URL: https://issues.apache.org/jira/browse/HIVE-865
>             Project: Hadoop Hive
>          Issue Type: Bug
>          Components: Query Processor
>            Reporter: Namit Jain
>            Assignee: Ning Zhang
>


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