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https://issues.apache.org/jira/browse/HTTPCLIENT-814?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12753325#action_12753325
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hector rovira commented on HTTPCLIENT-814:
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I have been able to reproduce this bug. This is also an issue for me.
Timeouts don't seem to be having an effect. I would upgrade to 4.0, but can't
right now.
Here's the snippet of code where I'm accessing the HttpClient (v.3.1). (Pls
ignore ResponseCallback and my custom exceptions). It blocks on the
httpClient.executeMethod. Setting log4j.xml to debug showed that the
org.apache.commons.httpclient.MultiThreadedHttpConnectionManager "Unable to get
a connection, waiting..."
public Object executeMethod(HttpMethod method, ResponseCallback
responseCallback) throws HttpClientException, HttpClientResponseException {
try {
int statusCode = httpClient.executeMethod(method);
log.info("executeMethod(" + method.getPath() + "):" +
statusCode);
return responseCallback.onResponse(statusCode, method);
} catch (IOException e) {
throw new HttpClientException(method, e);
} finally {
method.releaseConnection();
}
}
My workaround is to use the
org.apache.commons.httpclient.SimpleHttpConnectionManager instead, and add a
synchronization block to avoid multiple threads using the httpclient at the
same time.
> 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: Future
>
>
> 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 App 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 requests 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 HttpClient
> instances per request, and we shutdown the Connection Manager once we
> complete the transaction with the other server.
> The next work around we will be trying is to call the closeIdleConnections,
> this solution will remove the connections that can potentially 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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