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Posted to mapreduce-issues@hadoop.apache.org by "Allen Wittenauer (JIRA)" <ji...@apache.org> on 2015/05/06 05:33:19 UTC

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

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1290?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Allen Wittenauer updated MAPREDUCE-1290:
----------------------------------------
    Labels: BB2015-05-TBR DBOutoutFormat patch  (was: DBOutoutFormat patch)

> DBOutputFormat does not support rewriteBatchedStatements when using MySQL jdbc drivers
> --------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-1290
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1290
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 0.20.1
>            Reporter: Joe Crobak
>              Labels: BB2015-05-TBR, DBOutoutFormat, patch
>         Attachments: MAPREDUCE-1290.patch, MapReduce-1290-trunk.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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