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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2016/06/01 22:39:59 UTC
[jira] [Commented] (SPARK-15719) Disable writing Parquet summary
files by default
[ https://issues.apache.org/jira/browse/SPARK-15719?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15311272#comment-15311272 ]
Apache Spark commented on SPARK-15719:
--------------------------------------
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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