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Posted to issues@spark.apache.org by "Michael Armbrust (JIRA)" <ji...@apache.org> on 2016/06/29 00:59:10 UTC

[jira] [Closed] (SPARK-16188) Spark sql create a lot of small files

     [ https://issues.apache.org/jira/browse/SPARK-16188?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Armbrust closed SPARK-16188.
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    Resolution: Not A Bug

This is by design and changes would likely be too disruptive.  The correct solution is to use coalesce as suggested earlier.

> Spark sql create a lot of small files
> -------------------------------------
>
>                 Key: SPARK-16188
>                 URL: https://issues.apache.org/jira/browse/SPARK-16188
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 1.6.0
>         Environment: spark 1.6.1
>            Reporter: cen yuhai
>
> I find that spark sql will create files as many as partition size. When the results are small, there will be too many small files and most of them are empty. 
> Hive have a function to detect the avg of file size. If  avg file size is smaller than "hive.merge.smallfiles.avgsize", hive will add a job to merge files.



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