GitHub user holdenk opened a pull request:
https://github.com/apache/spark/pull/8911
[SPARK-10812][YARN][WIP] Spark hadoop util support switching to yarn
While this is likely not a huge issue for real production systems, for test
systems which may setup a Spark Context and tear it down and stand up a Spark
Context with a different master (e.g. some local mode & some yarn mode) tests
this cane be an issue. Discovered during work on spark-testing-base on Spark
1.4.1, but seems like the logic that triggers it is present in master (see
SparkHadoopUtil object). A valid work around for users encountering this issue
is to fork a different JVM, however this can be heavy weight.
```
[info] SampleMiniClusterTest:
[info] Exception encountered when attempting to run a suite with class
name: com.holdenkarau.spark.testing.SampleMiniClusterTest *** ABORTED ***
[info] java.lang.ClassCastException:
org.apache.spark.deploy.SparkHadoopUtil cannot be cast to
org.apache.spark.deploy.yarn.YarnSparkHadoopUtil
[info] at
org.apache.spark.deploy.yarn.YarnSparkHadoopUtil$.get(YarnSparkHadoopUtil.scala:163)
[info] at
org.apache.spark.deploy.yarn.Client.prepareLocalResources(Client.scala:257)
[info] at
org.apache.spark.deploy.yarn.Client.createContainerLaunchContext(Client.scala:561)
[info] at
org.apache.spark.deploy.yarn.Client.submitApplication(Client.scala:115)
[info] at
org.apache.spark.scheduler.cluster.YarnClientSchedulerBackend.start(YarnClientSchedulerBackend.scala:57)
[info] at
org.apache.spark.scheduler.TaskSchedulerImpl.start(TaskSchedulerImpl.scala:141)
[info] at org.apache.spark.SparkContext.<init>(SparkContext.scala:497)
[info] at
com.holdenkarau.spark.testing.SharedMiniCluster$class.setup(SharedMiniCluster.scala:186)
[info] at
com.holdenkarau.spark.testing.SampleMiniClusterTest.setup(SampleMiniClusterTest.scala:26)
[info] at
com.holdenkarau.spark.testing.SharedMiniCluster$class.beforeAll(SharedMiniCluster.scala:103)
```
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/holdenk/spark
SPARK-10812-spark-hadoop-util-support-switching-to-yarn
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/8911.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 #8911
----
commit 04c26b15ef06cb7751d1c7853db3708188e5e512
Author: Holden Karau <[email protected]>
Date: 2015-09-24T21:59:33Z
Supply Yarn or regular hadoop libs as required
commit 1915e7dfb95994986d3adac57f9f7c5ce9790dd9
Author: Holden Karau <[email protected]>
Date: 2015-09-24T21:59:59Z
Check to make sure changing the system property changes the hadoop utils as
expected
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