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https://issues.apache.org/jira/browse/SPARK-1155?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Josh Rosen resolved SPARK-1155.
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Resolution: Invalid
This issue is no longer relevant now that SparkEnv is no longer a thread-local.
> Clean up and document use of SparkEnv
> -------------------------------------
>
> Key: SPARK-1155
> URL: https://issues.apache.org/jira/browse/SPARK-1155
> Project: Spark
> Issue Type: New Feature
> Components: Spark Core
> Reporter: Patrick Wendell
> Assignee: Andrew Or
>
> We should provide better documentation explaining what SparkEnv is and why it
> needs to be thread local (basically, to allow it to be accessed inside of
> closures on executors). Also, in cases where SparkEnv is being accessed on
> the driver we should access it through the associated SparkContext rather
> than through the thread local. Finally, we should see if it's possible to
> just remove this as a thread local and instead make it a static singleton
> that the exeucutor sets once. This last thing might not be possible if, under
> certain code paths, this is used on the driver.
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