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https://issues.apache.org/jira/browse/SPARK-7819?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14572255#comment-14572255
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Fi commented on SPARK-7819:
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Actually, maybe the InvalidClassCastException might be a little too flaky.
I am running a spark job which queries an ORC table daily partition via the
HiveContext.
A single context is created, and I spin up about ten threads (one for each day).
I am seeing plenty of the same errors in various tasks, enough to kill the job
for that day.
Curiously, the exact same serialVersionUID are logged in each failure:
org.apache.spark.sql.hive.MetastoreRelation; local class incompatible:
stream classdesc serialVersionUID = 2590680563934099718, local class
serialVersionUID = -8650941563091306200
So the interesting thing is that some jobs (for a particular day) work
perfectly fine, but others fail.
I tried running this multi-threaded job again, and the same error occurs, but
in different places.
This job works perfectly fine on our Spark 1.3 builds, unfortunately, this
issue is occurring too often in a larger job in Spark 1.4 :(
> Isolated Hive Client Loader appears to cause Native Library
> libMapRClient.4.0.2-mapr.so already loaded in another classloader error
> -----------------------------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-7819
> URL: https://issues.apache.org/jira/browse/SPARK-7819
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.4.0
> Reporter: Fi
> Priority: Critical
> Attachments: invalidClassException.log, stacktrace.txt, test.py
>
>
> In reference to the pull request: https://github.com/apache/spark/pull/5876
> I have been running the Spark 1.3 branch for some time with no major hiccups,
> and recently switched to the Spark 1.4 branch.
> I build my spark distribution with the following build command:
> {noformat}
> make-distribution.sh --tgz --skip-java-test --with-tachyon -Phive
> -Phive-0.13.1 -Pmapr4 -Pspark-ganglia-lgpl -Pkinesis-asl -Phive-thriftserver
> {noformat}
> When running a python script containing a series of smoke tests I use to
> validate the build, I encountered an error under the following conditions:
> * start a spark context
> * start a hive context
> * run any hive query
> * stop the spark context
> * start a second spark context
> * run any hive query
> ** ERROR
> From what I can tell, the Isolated Class Loader is hitting a MapR class that
> is loading its native library (presumedly as part of a static initializer).
> Unfortunately, the JVM prohibits this the second time around.
> I would think that shutting down the SparkContext would clear out any
> vestigials of the JVM, so I'm surprised that this would even be a problem.
> Note: all other smoke tests we are running passes fine.
> I will attach the stacktrace and a python script reproducing the issue (at
> least for my environment and build).
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