[ https://issues.apache.org/jira/browse/HIVE-11499?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Vaibhav Gumashta updated HIVE-11499: ------------------------------------ Attachment: HIVE-11499.1.patch > Datanucleus leaks classloaders when used using embedded metastore with > HiveServer2 with UDFs > -------------------------------------------------------------------------------------------- > > Key: HIVE-11499 > URL: https://issues.apache.org/jira/browse/HIVE-11499 > Project: Hive > Issue Type: Bug > Components: HiveServer2, Metastore > Affects Versions: 0.14.0, 1.0.0, 1.2.0, 1.1.0, 1.1.1, 1.2.1 > Reporter: Vaibhav Gumashta > Assignee: Vaibhav Gumashta > Attachments: HIVE-11499.1.patch, HS2-NucleusCache-Leak.tiff > > > 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 to permgen leak, as shown in the attached > screenshot, where NucleusContext holds on to several URLClassloader objects. -- This message was sent by Atlassian JIRA (v6.3.4#6332)