Hi Folks,
Im hope some one can shed some light on this for me. Im currently doing a
prototype and decided i would do it with the httpclient4.0 alpha3 version. I
have or will have a multi-threaded scenario so i have a very similar set up as
the ClientMultiThreadedExecution example located here
http://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk/module-client/src/examples/org/apache/http/examples/client/ClientMultiThreadedExecution.java
Anyways i have the use case that should my server go down, my app will wait
till it comes back up. So i have a worker thread that polls the server or tries
to poll the server every 30 seconds. Now i re-use the same httpclient instance
right throughout the whole application
Now what i see in the log file is as follows
18203 [Thread-1] DEBUG org.apache.http.impl.client.ClientParamsStack -
'http.protocol.max-redirects': null
18203 [Thread-1] DEBUG org.apache.http.impl.client.ClientParamsStack -
'http.connection-manager.timeout': null
18203 [Thread-1] DEBUG
org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager -
ThreadSafeClientConnManager.getConnection:
HttpRoute[{}->http://localhost:8080], timeout = 0
18203 [Thread-1] DEBUG org.apache.http.impl.conn.tsccm.ConnPoolByRoute - No
free connections. HttpRoute[{}->http://localhost:8080]
18203 [Thread-1] DEBUG org.apache.http.impl.conn.tsccm.ConnPoolByRoute - Need
to wait for connection. HttpRoute[{}->http://localhost:8080]
My problem is that the client just hangs and i think it is due to the "Need to
wait for connection" part.
18203 [Thread-1] DEBUG org.apache.http.impl.conn.tsccm.ConnPoolByRoute - Need
to wait for connection. HttpRoute[{}->http://localhost:8080]
How long does a thread wait until it gets a free connection?? infinity?? Or how
is it released?? My polling thread is just hanging. I restart the server but
the polling thread is still waiting/hanging.
I have taken the same scenario and used the http client 3.1 and have no
problems like above.
I think i read somewhere that the connection is returned back to the pool when
the input stream is closed. Now if the server is down, i dont get a response
input stream, so does the httpget.abort release the connection back to the
pool? I dont think it has anything to do with the TIME_WAIT state either, once
the thread enters the "need to wait for connection" it will hang for infinity.
I tried to get a hold of the current threads connection but the API doesnt give
me that chance, just so i could close the connection myself and not be
dependant on whats underneath to clean up.
Anybody any input as to why my polling thread just hangs in a wait state for
infinity??
Cheers,
JB
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