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Posted to mapreduce-dev@hadoop.apache.org by "Joe Crobak (JIRA)" <ji...@apache.org> on 2009/12/12 20:51:18 UTC

[jira] Created: (MAPREDUCE-1290) DBOutputFormat does not support rewriteBatchedStatements when using MySQL jdbc drivers

DBOutputFormat does not support rewriteBatchedStatements when using MySQL jdbc drivers
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                 Key: MAPREDUCE-1290
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1290
             Project: Hadoop Map/Reduce
          Issue Type: Bug
            Reporter: Joe Crobak
         Attachments: MAPREDUCE-1290.patch

The DBOutputFormat adds a semi-colon to the end of the INSERT statement that it uses to save fields to the database.  Semicolons are typically used in command line programs but are not needed when using the JDBC API.  In this case, the stray semi-colon breaks rewriteBatchedStatement support. See: http://forums.mysql.com/read.php?39,271526,271526#msg-271526 for an example.

In my use case, rewriteBatchedStatement is very useful because it increases the speed of inserts and reduces memory consumption.

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