[YARN-4570] Nodemanager leaking RawLocalFilesystem instances for user "testing"

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Cannot Reproduce
• Affects Version/s: 2.6.0
• Component/s: nodemanager
• Assignee: Chang Li
• Reporter: Jason Darrell Lowe
• Created: 08/Jan/16 21:44
• Updated: 27/Jan/16 20:58
• Resolved: 22/Jan/16 17:15

Description

I recently ran across a NodeManager that was running slowly due to excessive GC. Digging into the heap I saw that most of the issue was leaked filesystem statistics data objects which has been fixed in HADOOP-12107. However I also noticed there were many thousands of RawLocalFilesystem objects on the heap, far more than any other FileSystem type. Sampling a number of them showed that they were for the "testing" user.