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https://issues.apache.org/jira/browse/SPARK-4180?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Josh Rosen updated SPARK-4180:
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Description:
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.
was:
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 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.
> 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
> Labels: starter
>
> 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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