Vaibhav Gumashta created HIVE-11499:
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Summary: Using embedded metastore with HiveServer2 leaks
classloaders when used with UDFs
Key: HIVE-11499
URL: https://issues.apache.org/jira/browse/HIVE-11499
Project: Hive
Issue Type: Bug
Components: HiveServer2, Metastore
Affects Versions: 1.2.0, 1.0.0, 0.14.0, 1.1.0, 1.1.1, 1.2.1
Reporter: Vaibhav Gumashta
Assignee: Vaibhav Gumashta
When UDFs are used, we create a new classloader to add the UDF jar. Similar to
what hadoop's reflection utils does(HIVE-11408), datanucleus caches the
classloaders
(https://github.com/datanucleus/datanucleus-core/blob/3.2/src/java/org/datanucleus/NucleusContext.java#L161).
JDOPersistanceManager factory (1 per JVM) holds on to a NucleusContext
reference
(https://github.com/datanucleus/datanucleus-api-jdo/blob/3.2/src/java/org/datanucleus/api/jdo/JDOPersistenceManagerFactory.java#L115).
Until we call NucleusContext#close, the classloader cache is not cleared. In
case of UDFs this can lead as shows in the attached screenshot,
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