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From Oleg Kalnichevski <ol...@apache.org>
Subject Re: how to release leased connection in httpclient PoolingClientConnectionManager
Date Thu, 15 Nov 2012 09:35:03 GMT
On Wed, 2012-11-14 at 19:38 +0800, Zhan Zhifeng wrote:
> Hi,
> 
> I run a crawler with httpclient. PoolingClientConnectionManager used in the
> process of crawling.
> I monitor the PoolStats with one monitor thread. And when my crawling
> website list is zero,
> and the ps_.getLeased() is always not be zero.
> But i am not sure that the crawling job is finished or not. PS:
> ps_.getAvailable() is zero.
> 
> refer the
> https://issues.apache.org/jira/browse/HTTPCLIENT-1104?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
> New connection pool and pooling connection manager implementations now
> expose pool stats such number of leased & available connections.
> Stats can be obtained either for a particular route or the entire pool.
> 
> I also do the following method to try to release the connection in pool,
> but it seems not work:
> (1) _httpclient.getParams().
> setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 100000);
> (2) In monitor thread, connMgr.closeExpiredConnections();
> connMgr.closeIdleConnections(30, TimeUnit.SECONDS);
> 
> I am wandering if there is any active crawling thread using these leased
> connections,
> and how can i know it or how can i operate these leased connections?
> And then i can finish my crawling job more accurately.
> 
> Thanks a lot.

I think your code may be leaking connections. Just make sure that you
_always_ response content (even if you do not need it) and it will
automatically take care of connection release.

Oleg 



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