[HADOOP-19049] Class loader leak caused by StatisticsDataReferenceCleaner thread

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.3.6
• Fix Version/s: 3.4.0, 3.5.0, 3.4.1
• Component/s: common
• Labels: pull-request-available
• Assignee: Jia Fan
• Reporter: Jia Fan
• Created: 23/Jan/24 11:58
• Updated: 11/Feb/24 01:09
• Resolved: 03/Feb/24 14:56

Description

The "org.apache.hadoop.fs.FileSystem$Statistics$StatisticsDataReferenceCleaner" daemon thread was created by FileSystem. 

This is fine if the thread's context class loader is the system class loader, but it's bad if the context class loader is a custom class loader. The reference held by this daemon thread means that the class loader can never become eligible for GC.

Issue Links

• links to: GitHub Pull Request #6488