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https://issues.apache.org/jira/browse/HTTPCLIENT-2416?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18062620#comment-18062620
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Arturo Bernal commented on HTTPCLIENT-2416:
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[~benjaminp]
I ran a variant of your reproducer and I can reproduce transient
{{Leased/Pending}} right after {{{}cancel(true){}}}, but it drains to zero once
the pool processes pending requests. Calling
{{connectionManager.closeExpired()}} (forces pool to process/purge cancelled
pending requests) results in {{{}Available=0 Leased=0 Pending=0{}}}. So this
looks like pool accounting / pending-queue cleanup timing, not an actual leak.
> interrupts and timeouts may leak connections
> --------------------------------------------
>
> Key: HTTPCLIENT-2416
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-2416
> Project: HttpComponents HttpClient
> Issue Type: Bug
> Affects Versions: 5.6
> Reporter: Benjamin Peterson
> Priority: Major
> Attachments: HttpGetExample.java
>
>
> Consider {{InternalExecRuntime.acquireEndpoint}}:
> {code:java}
> try {
> final ConnectionEndpoint connectionEndpoint =
> connRequest.get(connectionRequestTimeout);
> } catch (final TimeoutException ex) {
> connRequest.cancel();
> throw new ConnectionRequestTimeoutException(ex.getMessage());
> } catch (final InterruptedException interrupted) {
> connRequest.cancel();
> Thread.currentThread().interrupt();
> throw new RequestFailedException("Request aborted",
> interrupted);
> }
> {code}
> Consider this order of operations:
> 1. The thread blocked in {{codeRequest.get}} is interrupted or times out.
> 2. The connection pool completes the future with a connection.
> 3. The interrupted thread starts propagating the {{InterruptedException}} or
> {{TimeoutException}}. When it reaches the {{catch}} blocks, it will call
> {{connRequest.cancel()}}. But cancelation will do nothing because the
> connection pool already completed the future. The connection will leak.
> The window may be narrow, but it's certainly a possibility if heavy load
> means the blocked thread is delayed in being scheduled to propagate the
> {{InterruptedException}} or {{TimeoutException}}.
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