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From "Aaron Kimball (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-685) Sqoop will fail with OutOfMemory on large tables using mysql
Date Tue, 07 Jul 2009 17:58:15 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12728258#action_12728258
] 

Aaron Kimball commented on MAPREDUCE-685:
-----------------------------------------

Attaching rebased patch.

> Sqoop will fail with OutOfMemory on large tables using mysql
> ------------------------------------------------------------
>
>                 Key: MAPREDUCE-685
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-685
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: contrib/sqoop
>            Reporter: Aaron Kimball
>            Assignee: Aaron Kimball
>         Attachments: MAPREDUCE-685.3.patch, MAPREDUCE-685.patch, MAPREDUCE-685.patch.2
>
>
> The default MySQL JDBC client behavior is to buffer the entire ResultSet in the client
before allowing the user to use the ResultSet object. On large SELECTs, this can cause OutOfMemory
exceptions, even when the client intends to close the ResultSet after reading only a few rows.
The MySQL ConnManager should configure its connection to use row-at-a-time delivery of results
to the client.

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