[jira] [Created] (HIVE-11499) Using embedded metastore with HiveServer2 leaks classloaders when used with UDFs

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

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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