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From "Jim Gomes (JIRA)" <jira+amq...@apache.org>
Subject [jira] [Work stopped] (AMQNET-330) MutexTransport creates bottleneck for multi-threaded applications
Date Tue, 14 Jun 2011 23:08:47 GMT

     [ https://issues.apache.org/jira/browse/AMQNET-330?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Work on AMQNET-330 stopped by Jim Gomes.

> MutexTransport creates bottleneck for multi-threaded applications
> -----------------------------------------------------------------
>
>                 Key: AMQNET-330
>                 URL: https://issues.apache.org/jira/browse/AMQNET-330
>             Project: ActiveMQ .Net
>          Issue Type: Bug
>          Components: ActiveMQ, Stomp
>    Affects Versions: 1.5.1
>         Environment: Windows 7 64-bit, .NET 3.5 & 4.0.
>            Reporter: Jim Gomes
>            Assignee: Jim Gomes
>              Labels: mutex, timeout, transport
>             Fix For: 1.5.2, 1.6.0
>
>   Original Estimate: 2h
>          Time Spent: 2h
>  Remaining Estimate: 0h
>
> The MutexTransport creates a massive bottleneck in a multi-threaded application that
uses timeouts for sending messages.  This scenario makes the assumption that the failover
protocol is being used to automatically reconnect to a broker that goes offline.  If multiple
threads are sending messages that have a send timeout and the broker is currently offline,
then those calls get queued up in serial instead of executing in parallel.  For example, if
the send timeout is set to 10 seconds and 50  threads are simultaneously sending a message,
it will take 500 seconds for all fifty threads to finally error out.  The programmer of the
code would expect the timeout to be 10 seconds maximum in order to have acceptable application
performance.
> The MutexTransport needs to honor and use the timeout value of the transport that it
is protecting and allow parallel waits.

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