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From "Phil Steitz (JIRA)" <j...@apache.org>
Subject [jira] Updated: (POOL-75) [pool] GenericObjectPool not FIFO with respect to borrowing threads
Date Mon, 04 Feb 2008 05:03:09 GMT

     [ https://issues.apache.org/jira/browse/POOL-75?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Phil Steitz updated POOL-75:
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    Attachment:     (was: adult-sex.html)

> [pool] GenericObjectPool not FIFO with respect to borrowing threads
> -------------------------------------------------------------------
>
>                 Key: POOL-75
>                 URL: https://issues.apache.org/jira/browse/POOL-75
>             Project: Commons Pool
>          Issue Type: Improvement
>    Affects Versions: Nightly Builds
>         Environment: Operating System: All
> Platform: All
>            Reporter: Gordon Mohr
>            Priority: Minor
>             Fix For: 1.5
>
>         Attachments: ctest.fairness.png, ctest.original.png, java.patch
>
>
> GenericObjectPool has recently been made FIFO with respect to the managed pool
> objects -- however, it is still not FIFO with respect to threads requesting
> those objects. Specifically, because standard non-fair Java synchronization
> monitors are used, later threads may barge ahead of earlier threads that are
> already waiting for a pool object to become available. At its extreme, some
> threads can cycle objects through the pool many times while others wait
> interminable. 
> Not every application needs FIFO fairness with respect to threads, and such
> fairness implies an overhead, so it  need not be the default behavior, but it
> would be a valuable option where many threads are sharing a smaller number of
> pool objects. 
> I can submit a FairGenericObjectPool which achieves thread-fairness; it only
> requires small changes to GenericObjectPool which allow some subclass overriding.

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