[CXF-8885] HttpClient SelectorManager threads run indefinitely causing OOM

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.0.0, 3.6.0
• Fix Version/s: 3.6.2, 4.0.3
• Component/s: Transports
• Estimated Complexity: Unknown
• Assignee: Daniel Kulp
• Reporter: Cardo Eggert
• Created: 09/Jun/23 12:44
• Updated: 28/Nov/23 12:47
• Resolved: 05/Sep/23 19:48

Description

Probably caused by https://issues.apache.org/jira/browse/CXF-8840 .

Started to notice that when updating from 3.5.x to 3.6.0 that our servers started getting OOM. Noticed from the resulting logs that a lot of threads were active that were in the format 
HttpClient-<NR>-SelectorManager
when reverted to 3.5.6 then it did not occur anymore.

 

Tried to use VirtualVM when debugging it and saw when the thread was started, it never died, basically meaning that it ran indefinitely. OOM happened when there were about over 1000 of these threads.

Issue Links

• is related to: CXF-8902 Resource Leak at HttpClientHTTPConduit leads to OutOfMemoryError
• is related to: CXF-8903 Too many open files error in HttpClientHTTPConduit
• links to: GitHub Pull Request #1377
• links to: GitHub Pull Request #1380
• links to: GitHub Pull Request #1381