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https://issues.apache.org/jira/browse/SPARK-5968?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14335098#comment-14335098
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Apache Spark commented on SPARK-5968:
-------------------------------------
User 'liancheng' has created a pull request for this issue:
https://github.com/apache/spark/pull/4744
> Parquet warning in spark-shell
> ------------------------------
>
> Key: SPARK-5968
> URL: https://issues.apache.org/jira/browse/SPARK-5968
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.3.0
> Reporter: Michael Armbrust
> Assignee: Cheng Lian
> Priority: Critical
>
> This may happen in the case of schema evolving, namely appending new Parquet
> data with different but compatible schema to existing Parquet files:
> {code}
> 15/02/23 23:29:24 WARN ParquetOutputCommitter: could not write summary file
> for rankings
> parquet.io.ParquetEncodingException:
> file:/Users/matei/workspace/apache-spark/rankings/part-r-00001.parquet
> invalid: all the files must be contained in the root rankings
> at parquet.hadoop.ParquetFileWriter.mergeFooters(ParquetFileWriter.java:422)
> at
> parquet.hadoop.ParquetFileWriter.writeMetadataFile(ParquetFileWriter.java:398)
> at
> parquet.hadoop.ParquetOutputCommitter.commitJob(ParquetOutputCommitter.java:51)
> {code}
> The reason is that the Spark SQL schemas stored in Parquet key-value metadata
> differ. Parquet doesn't know how to "merge" these opaque user-defined
> metadata, and just throw an exception and give up writing summary files.
> Since the Parquet data source in Spark 1.3.0 supports schema merging, it's
> harmless. But this is kind of scary for the user. We should try to suppress
> this through the logger.
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