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From "Sean Owen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-18379) Make the parallelism of parallelPartitionDiscovery configurable.
Date Wed, 28 Dec 2016 10:39:58 GMT

    [ https://issues.apache.org/jira/browse/SPARK-18379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15782617#comment-15782617
] 

Sean Owen commented on SPARK-18379:
-----------------------------------

I don't see how this change modifies behavior. It introduces a new config that lets you change
the behavior, but the default matches the previous behavior. This is why it does what you
want and is safe to back-port right?

> Make the parallelism of parallelPartitionDiscovery configurable. 
> -----------------------------------------------------------------
>
>                 Key: SPARK-18379
>                 URL: https://issues.apache.org/jira/browse/SPARK-18379
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 2.0.1
>            Reporter: Genmao Yu
>            Assignee: Genmao Yu
>            Priority: Minor
>             Fix For: 2.2.0
>
>
> The largest parallelism in PartitioningAwareFileIndex #listLeafFilesInParallel() is 10000
in hard code. We may need to make this number configurable. And in PR, I reduce it to 100.



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