[jira] [Resolved] (SPARK-15719) Disable writing Parquet summary files by default

["Cheng Lian (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-15719?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Cheng Lian resolved SPARK-15719.
--------------------------------
       Resolution: Fixed
    Fix Version/s: 2.0.0

Issue resolved by pull request 13455
[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
>              Labels: release_notes, releasenotes
>             Fix For: 2.0.0
>
>
> 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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