spark-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Apache Spark (JIRA)" <>
Subject [jira] [Commented] (SPARK-15719) Disable writing Parquet summary files by default
Date Wed, 01 Jun 2016 22:39:59 GMT


Apache Spark commented on SPARK-15719:

User 'liancheng' has created a pull request for this issue:

> Disable writing Parquet summary files by default
> ------------------------------------------------
>                 Key: SPARK-15719
>                 URL:
>             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
> 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.

This message was sent by Atlassian JIRA

To unsubscribe, e-mail:
For additional commands, e-mail:

View raw message