Vaibhav Gumashta created HIVE-11499: ---------------------------------------
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, -- This message was sent by Atlassian JIRA (v6.3.4#6332)