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https://issues.apache.org/jira/browse/SPARK-21400?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16102638#comment-16102638
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Robert Kruszewski commented on SPARK-21400:
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Fixed in [https://github.com/apache/spark/pull/18689 ]
> Spark shouldn't ignore user defined output committer in append mode
> -------------------------------------------------------------------
>
> Key: SPARK-21400
> URL: https://issues.apache.org/jira/browse/SPARK-21400
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Robert Kruszewski
>
> In https://issues.apache.org/jira/browse/SPARK-8578 we decided to override
> user defined output committers in append mode. The reasoning was that there's
> some output committers that can lead to correctness issues. Since then we
> have removed DirectParquetOutputCommitter (the biggest known offender) from
> codebase and rely on default implementations.
> I believe that we shouldn't be restricting this anymore and users should
> understand that if they're overwriting this configuration they have tested
> their committer for correctness. This unblocks using more sophisticated and
> performant output committers without need to overwrite file format
> implementations.
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