On Mon, 2008-10-13 at 10:43 -0700, Mohit Anchlia wrote:
> I saw quite a few posts on how to get rid of CLOSE_WAIT. And based on
> those posts I changed my code but still I see CLOSE_WAITS. Below is my
> test code:
>
>
> public class Test {
> private static MultiThreadedHttpConnectionManager con = new
> MultiThreadedHttpConnectionManager();
> private static void doGet(HttpClient client) {
> System.out.println("CONN POOL " + con.getConnectionsInPool());
> //System.out.println("DEF CON "
> +client.getHttpConnectionManager().getParams().getDefaultMaxConnectionsPerHost());
> //System.out.println("MAX CON " +
> client.getHttpConnectionManager().getParams().getMaxTotalConnections()
> );
>
> GetMethod get = new GetMethod("http://localhost:8080/s/e";);
> get.setQueryString("version=V07.08&request_type=1");
> get.addRequestHeader( "Connection", "close");
> try {
> long statusCode = client.executeMethod(get);
>
> System.out.println(IOUtils.toString(get.getResponseBodyAsStream()));
> if (statusCode != HttpStatus.SC_OK) {
> }
> Thread.sleep(1000);
> } catch(IOException ioe){
> ioe.printStackTrace();
> }catch (Exception e){} finally {
> if (get != null) get.releaseConnection();
> }
> }
> public static void main(String []a) throws Exception{
>
> HttpConnectionManagerParams params = new
> HttpConnectionManagerParams();
> params.setDefaultMaxConnectionsPerHost(2);
> //params.setMaxConnectionsPerHost(2);
> params.setMaxTotalConnections(2);
> con.setParams(params);
>
> HttpClient client = new HttpClient();
> client.getParams().setParameter("http.connection.timeout", new
> Integer(1000));
> int i = 0;
> while ( i++ < 500){
> client = new HttpClient(con);
> doGet(client);
> client = null;
> con.closeIdleConnections(1000l);
> //con.deleteClosedConnections();
> }
> /////////////
>
> so I am closing connection after each call, but still I see lot of
> CLOSE_WAIT. Is there something that I am doing incorrectly? I was
> expecting that above code will get rid of CLOSE_WAIT
>
Firstly, turn context logging on and see if HttpClient is reusing
connections
http://hc.apache.org/httpclient-3.x/logging.html
Secondly, neither Thread#sleep() nor #closeIdleConnections() can
guarantee exact timing. If you want all idle connections closed
immediately you should pass 0 as a parameter to
#closeIdleConnections();
con.closeIdleConnections(0L);
Hope this helps
Oleg
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