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From "Vaibhav Gumashta (JIRA)" <>
Subject [jira] [Created] (HIVE-11408) HiveServer2 is leaking ClassLoaders when add jar / temporary functions are used
Date Thu, 30 Jul 2015 04:44:04 GMT
Vaibhav Gumashta created HIVE-11408:

             Summary: HiveServer2 is leaking ClassLoaders when add jar / temporary functions
are used
                 Key: HIVE-11408
             Project: Hive
          Issue Type: Bug
          Components: HiveServer2
    Affects Versions: 0.14.0
            Reporter: Vaibhav Gumashta
            Assignee: Vaibhav Gumashta

I'm able to reproduce with 0.14. I'm yet to see if HIVE-10453 fixes the issue (since it's
on top of a larger patch: HIVE-2573 that was added in 1.2). 

Basically, add jar creates a new classloader for loading the classes from the new jar and
adds the new classloader to the SessionState object of user's session, making the older one
its parent. Creating a temporary function uses the new classloader to load the class used
for the function. On closing a session, although there is code to close the classloader for
the session, I'm not seeing the new classloader getting GCed and from the heapdump I can see
it holds on to the temporary function's class that should have gone away after the session

Steps to reproduce:
jdbc:hive2://localhost:10000/> add jar hdfs:///tmp/audf.jar;

Use a profiler (I'm using yourkit) to verify that a new URLClassLoader was added.

jdbc:hive2://localhost:10000/> CREATE TEMPORARY FUNCTION funcA AS 'org.gumashta.udf.AUDF';


Take the memory snapshot and verify that the new URLClassLoader is indeed there and is holding
onto the class it loaded (org.gumashta.udf.AUDF).

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