[jira] [Commented] (SPARK-4180) SparkContext constructor should throw exception if another SparkContext is already running

["Patrick Wendell (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-4180?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14193747#comment-14193747 ] 

Patrick Wendell commented on SPARK-4180:
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Yeah [~adav] just ran into an issue where a lot of our tests weren't properly cleaning SparkContext's and it was a huge pain. We could also log the callsite where a SparkContext is created, so if you try to create another one it actually tells you where the previous one was created and throws a helpful exception.

> SparkContext constructor should throw exception if another SparkContext is already running
> ------------------------------------------------------------------------------------------
>
>                 Key: SPARK-4180
>                 URL: https://issues.apache.org/jira/browse/SPARK-4180
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>            Reporter: Josh Rosen
>            Priority: Blocker
>
> Spark does not currently support multiple concurrently-running SparkContexts in the same JVM (see SPARK-2243).  Therefore, SparkContext's constructor should throw an exception if there is an active SparkContext that has not been shut down via {{stop()}}.
> PySpark already does this, but the Scala SparkContext should do the same thing.  The current behavior with multiple active contexts is unspecified / not understood and it may be the source of confusing errors (see the user error report in SPARK-4080, for example).
> This should be pretty easy to add: just add a {{activeSparkContext}} field to the SparkContext companion object and {{synchronize}} on it in the constructor and {{stop()}} methods; see PySpark's {{context.py}} file for an example of this approach.



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