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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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Lars Francke updated SPARK-572:
-------------------------------
Description:
Consider the following piece of code:
{code}
object Foo {
var xx = -1
def main() {
xx = 1
val sc = new SparkContext(...)
sc.broadcast(xx)
sc.parallelize(0 to 10).map(i=>{ ... xx ...})
}
}
{code}
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...
was:
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...
> 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:
> {code}
> object Foo {
> var xx = -1
> def main() {
> xx = 1
> val sc = new SparkContext(...)
> sc.broadcast(xx)
> sc.parallelize(0 to 10).map(i=>{ ... xx ...})
> }
> }
> {code}
> 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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