Carter Kozak created HTTPCLIENT-2184:
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Summary: Leased Connection Leak after upgrade to 5.1.1
Key: HTTPCLIENT-2184
URL: https://issues.apache.org/jira/browse/HTTPCLIENT-2184
Project: HttpComponents HttpClient
Issue Type: Bug
Components: HttpClient (classic)
Affects Versions: 5.1.1
Reporter: Carter Kozak
Attachments: 2021-11-11_1095x517_screen.png
Unfortunately I haven't had a chance to build a local reproducer yet, nor have
I had a chance to profile a system experiencing this failure – I intend to add
additional data to this ticket later on as I debug.
I do have a system deployed where the issue does not reproduce on 5.1, but I
can redeploy only changing the httpcomponents-client jar to 5.1.1 (no other
transitive dependency changes, etc) and the leak appears. This should rule out
bad application code as a root cause, I also have metrics which capture any
time a response is not closed, which reports zero leaks in both cases.
I have attached a graph of my connection pool leased-connections metric, the
blue line in the middle represents the first version which took
httpcomponents-client 5.1.1, where previously leased connections sat right
around zero. There's a short gap after the blue line ends where we rolled back
to the previous release, followed by a few smaller successful attempts to
reproduce the issue resulting in large sets of leased connections.
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