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https://issues.apache.org/jira/browse/SPARK-572?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Reynold Xin closed SPARK-572.
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Resolution: Won't Fix
Closing this as won't fix since it is very hard to enforce and we do "abuse" it
to run stateful computation.
> Forbid update of static mutable variables
> -----------------------------------------
>
> Key: SPARK-572
> URL: https://issues.apache.org/jira/browse/SPARK-572
> Project: Spark
> Issue Type: Improvement
> Reporter: tjhunter
>
> Consider the following piece of code:
> <pre>
> object Foo {
> var xx = -1
> def main() {
> xx = 1
> val sc = new SparkContext(...)
> sc.broadcast(xx)
> sc.parallelize(0 to 10).map(i=>{ ... xx ...})
> }
> }
> </pre>
> Can you guess the value of xx? It is 1 when you use the local scheduler and
> -1 when you use the mesos scheduler. Given the complications, it should
> probably just be forbidden for now...
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