[IMPALA-2002] Allow external data source classes to be cached

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Impala 1.4, Impala 2.0
• Fix Version/s: Impala 2.3.0
• Labels: resource-management
• Assignee: Matthew Jacobs
• Reporter: Matthew Jacobs
• Created: 13/May/15 21:36
• Updated: 22/May/15 23:18
• Resolved: 22/May/15 23:18

Description

Currently the jars for external data sources are loaded for every query. We have seen some use cases where there is some static state which prevents the ClassLoader from being unloaded and thus leaking as queries over the data source are run.

We can make it possible to cache the data source Class object.