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https://issues.apache.org/jira/browse/SPARK-2585?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14160642#comment-14160642
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Andrew Ash commented on SPARK-2585:
-----------------------------------

I also vote for "correct by default" and there are various potentially 
dangerous knobs you can turn to squeeze out more performance at risk if you 
care to.

Note that the {{new JobConf()}} constructor loads defaults out of the Hadoop 
config files (I think {{core-site.xml}} and {{hdfs-site.xml}}) and you can 
disable that with the {{JobConf(false)}} constructor.  Not sure if we need the 
local config files per server or if all the config options come solely from the 
driver's {{JobConf}} when instantiated.

> Remove special handling of Hadoop JobConf
> -----------------------------------------
>
>                 Key: SPARK-2585
>                 URL: https://issues.apache.org/jira/browse/SPARK-2585
>             Project: Spark
>          Issue Type: Improvement
>          Components: Spark Core
>            Reporter: Patrick Wendell
>            Assignee: Josh Rosen
>            Priority: Critical
>
> This is a follow up to SPARK-2521 and should close SPARK-2546 (provided the 
> implementation does not use shared conf objects). We no longer need to 
> specially broadcast the Hadoop configuration since we are broadcasting RDD 
> data anyways.



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