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https://issues.apache.org/jira/browse/HTTPCLIENT-814?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12662398#action_12662398
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Oleg Kalnichevski commented on HTTPCLIENT-814:
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I suspect rather strongly your application is leaking connections by not
returning them back to the pool. Connections are not supposed just to pile up,
unless your application is always connecting to a new host or not releasing
existing connections back to the pool.
BTW, consider upgrading to 4.0 which has a massively better connection
management architecture.
Oleg
> MultiThreadedHttpConnectionManager deadlocks when reusing socket connections
> ----------------------------------------------------------------------------
>
> Key: HTTPCLIENT-814
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-814
> Project: HttpComponents HttpClient
> Issue Type: Bug
> Components: HttpClient
> Affects Versions: 3.1 Final
> Environment: Tomcat 6.18 running on a Windows 2003 server
> Reporter: Will Franco
> Fix For: 3.1.1
>
>
> During our Load Testing we encountered that the
> MultiThreadedHttpConnectionManager deadlocks when reusing socket connections.
> These socket connections remain in the pool in a CLOSE_WAIT state, and the
> pool is unable to reuse them or create new ones because the maximum number of
> connection has already been reached, thus deadlocking.
> Let me explain briefly how this library is being used and the temporary work
> around that we are using. However, the correct solution would be to use the
> connection pool.
> Usage:
> 1) The HttPClient is being used to handle connections to another server from
> our Web Application. So far, for every request our Web Apps processes we
> have to make at least one request to another server using the HttpClient.
> 2) Our load tester, loads our web app with thousands of request within the
> first 30 seconds, and maintains such high volume of requests for at least 24
> hours
> Work Around:
> The current work around we implemented is to have different instances of the
> HttpClient per request, and we shutdown the Connection Manager once we
> complete the transaction with the other server.
> The next work around we will be implementing is to called the
> closeIdleConnections, this solution will remove the connections that can
> pontentialy deadlock the connection manager allowing it to allocate new ones.
> Please email me to [email protected] if you need any further information
> regarding this issue.
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