GitHub user swkimme opened a pull request:
https://github.com/apache/spark/pull/5046
[SPARK-6299][CORE] ClassNotFoundException in standalone mode when running
groupByKey with class defined in REPL
```
case class ClassA(value: String)
val rdd = sc.parallelize(List(("k1", ClassA("v1")), ("k1", ClassA("v2")) ))
rdd.groupByKey.collect
```
This code used to be throw exception in spark-shell, because while
shuffling ```JavaSerializer```uses ```defaultClassLoader``` which was defined
like ```env.serializer.setDefaultClassLoader(urlClassLoader)```.
It should be ```env.serializer.setDefaultClassLoader(urlClassLoader)```,
like
```
override def run() {
val deserializeStartTime = System.currentTimeMillis()
Thread.currentThread.setContextClassLoader(replClassLoader)
```
in TaskRunner.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/swkimme/spark master
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/5046.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #5046
----
commit c1b1fc732c2295412c38319968a6d8e1d949ce3b
Author: Kevin (Sangwoo) Kim <[email protected]>
Date: 2015-03-16T13:31:42Z
use REPL class loader for executor's serializer
----
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