[jira] [Created] (SPARK-22217) ParquetFileFormat to support arbitrary OutputCommitters if parquet.enable.summary-metadata is false

["Steve Loughran (JIRA)" <ji...@apache.org>]

Steve Loughran created SPARK-22217:
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             Summary: ParquetFileFormat to support arbitrary OutputCommitters if parquet.enable.summary-metadata is false
                 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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