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https://issues.apache.org/jira/browse/HTTPCLIENT-1108?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13067657#comment-13067657
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Jon Moore commented on HTTPCLIENT-1108:
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@James: that looks very interesting, thanks for posting that. I think the FIFO
fix that I checked in is an improvement over LIFO, although it optimizes for
minimizing open connections rather than for performance (although I think
reusing the most-recently-used connection will tend to have you use the one
with the largest CWND anyway).
Would you mind opening a new issue with a feature request for supporting
configurable connection reuse strategies? I think that's the right long-term
strategy, since clients will want to optimize for different things at different
times.
> different connection reuse strategy would reduce number of open connections
> ---------------------------------------------------------------------------
>
> Key: HTTPCLIENT-1108
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1108
> Project: HttpComponents HttpClient
> Issue Type: Improvement
> Components: HttpClient
> Affects Versions: 4.1.1
> Reporter: Jon Moore
> Assignee: Jon Moore
> Priority: Minor
> Fix For: 4.1.2
>
>
> Currently, the ThreadSafeClientConnManager reuses persistent connections in a
> round-robin fashion: when the connection is checked back into the pool, it is
> added to a queue of available connections for later use. This has the perhaps
> unintended effect that the client may keep open more connections than needed,
> because the "last used" time keeps getting updated and none of the
> connections can get reclaimed via closeIdleConnections().
> Exchanging the queue (FIFO) for a stack (LIFO) would result in extra
> connections actually becoming idle for long enough to be reclaimed.
> I have a working patch for this; just need to get my act together to get it
> in.
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