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From "James Abley (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HTTPCLIENT-1108) different connection reuse strategy would reduce number of open connections
Date Mon, 18 Jul 2011 21:56:57 GMT

    [ https://issues.apache.org/jira/browse/HTTPCLIENT-1108?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13067335#comment-13067335
] 

James Abley commented on HTTPCLIENT-1108:
-----------------------------------------

One minor observation. From a performance perspective, a different data structure might be
preferable. I was thinking of something that sorted the connections based on CWND might be
better, similar to what recently landed in Firefox [1],[2]

[1] https://bugzilla.mozilla.org/show_bug.cgi?id=624739
[2] http://blog.httpwatch.com/2011/06/10/investigating-the-network-performance-of-firefox-5/

> 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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