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From "Jon Moore (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HTTPCLIENT-1108) different connection reuse strategy would reduce number of open connections
Date Tue, 19 Jul 2011 12:23:57 GMT

    [ https://issues.apache.org/jira/browse/HTTPCLIENT-1108?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13067657#comment-13067657
] 

Jon Moore commented on HTTPCLIENT-1108:
---------------------------------------

@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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