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From "Ning Zhang (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HIVE-865) mapjoin: memory leak for same key with very large number of values
Date Mon, 05 Oct 2009 19:20:31 GMT

     [ https://issues.apache.org/jira/browse/HIVE-865?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ning Zhang updated HIVE-865:
----------------------------

    Attachment: HIVE-865.patch

This patch added solves the Out-of-memory exception thrown by MapJoinOperator. The changes
include:
1) make the persistent hashtable HTree non-transactional. (this is not the cause of out-of-memory
error, but it may improve performance)
2) commit the RecordManager for every 100 record insertion. (this is the main cause of OOM
issue).

> 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
>         Attachments: HIVE-865.patch
>
>


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