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https://issues.apache.org/jira/browse/SPARK-15719?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15311272#comment-15311272
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Apache Spark commented on SPARK-15719:
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User 'liancheng' has created a pull request for this issue:
https://github.com/apache/spark/pull/13455
> Disable writing Parquet summary files by default
> ------------------------------------------------
>
> Key: SPARK-15719
> URL: https://issues.apache.org/jira/browse/SPARK-15719
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.0.0
> Reporter: Cheng Lian
> Assignee: Cheng Lian
>
> Parquet summary files are not particular useful nowadays since
> # when schema merging is disabled, we assume schema of all Parquet part-files
> are identical, thus we can read the footer from any part-files.
> # when schema merging is enabled, we need to read footers of all files anyway
> to do the merge.
> On the other hand, writing summary files can be expensive because footers of
> all part-files must be read and merged. This is particularly costly when
> appending small dataset to large existing Parquet dataset.
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