[jira] [Created] (SPARK-7819) Isolated Hive Client Loader appears to cause Native Library libMapRClient.4.0.2-mapr.so already loaded in another classloader error

["Fi (JIRA)" <ji...@apache.org>]

Fi created SPARK-7819:
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             Summary: 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
    Affects Versions: 1.4.1
            Reporter: Fi
         Attachments: 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:

make-distribution.sh --tgz --skip-java-test --with-tachyon -Phive -Phive-0.13.1 -Pmapr4 -Pspark-ganglia-lgpl -Pkinesis-asl -Phive-thriftserver

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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