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https://issues.apache.org/jira/browse/SPARK-22217?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran updated SPARK-22217:
-----------------------------------
    Summary: ParquetFileFormat to support arbitrary OutputCommitters  (was: 
ParquetFileFormat to support arbitrary OutputCommitters if 
parquet.enable.summary-metadata is false)

> ParquetFileFormat to support arbitrary OutputCommitters
> -------------------------------------------------------
>
>                 Key: SPARK-22217
>                 URL: https://issues.apache.org/jira/browse/SPARK-22217
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 2.2.0
>            Reporter: Steve Loughran
>
> Although you can choose which committer to write dataframes as parquet data 
> via {{spark.sql.parquet.output.committer.class}}, you get a class cast 
> exception if this is not a 
> {{org.apache.parquet.hadoop.ParquetOutputCommitter}} or subclass.
> This is not consistent with the docs in SQLConf, which says
> bq.  The specified class needs to be a subclass of 
> org.apache.hadoop.mapreduce.OutputCommitter.  Typically, it's also a subclass 
> of org.apache.parquet.hadoop.ParquetOutputCommitter.
> It is simple to relax {{ParquetFileFormat}}'s requirements, though if the 
> user has set
> {{parquet.enable.summary-metadata=true}}, and set a committer which is not a 
> ParquetOutputCommitter, then they won't see the data.



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