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From Joan Balagueró <joan.balagu...@grupoventus.com>
Subject java.util.concurrent.TimeoutException with the async client
Date Thu, 27 Oct 2016 10:23:26 GMT
Hello,

After working in production with the async client (instead of the blocking
one) everything seems ok, except that now I can see this error
intermitently:

java.util.concurrent.TimeoutException
        at
org.apache.http.nio.pool.AbstractNIOConnPool.processPendingRequest(AbstractN
IOConnPool.java:364)
        at
org.apache.http.nio.pool.AbstractNIOConnPool.processNextPendingRequest(Abstr
actNIOConnPool.java:344)
        at
org.apache.http.nio.pool.AbstractNIOConnPool.release(AbstractNIOConnPool.jav
a:318)
        at
org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager.releaseCon
nection(PoolingNHttpClientConnectionManager.java:303)
        at
org.apache.http.impl.nio.client.AbstractClientExchangeHandler.releaseConnect
ion(AbstractClientExchangeHandler.java:239)
        at
org.apache.http.impl.nio.client.MainClientExec.responseCompleted(MainClientE
xec.java:387)
        at
org.apache.http.impl.nio.client.DefaultClientExchangeHandlerImpl.responseCom
pleted(DefaultClientExchangeHandlerImpl.java:168)
        at
org.apache.http.nio.protocol.HttpAsyncRequestExecutor.processResponse(HttpAs
yncRequestExecutor.java:436)
        at
org.apache.http.nio.protocol.HttpAsyncRequestExecutor.inputReady(HttpAsyncRe
questExecutor.java:326)
        at
org.apache.http.impl.nio.DefaultNHttpClientConnection.consumeInput(DefaultNH
ttpClientConnection.java:265)
        at
org.apache.http.impl.nio.client.InternalIODispatch.onInputReady(InternalIODi
spatch.java:81)
        at
org.apache.http.impl.nio.client.InternalIODispatch.onInputReady(InternalIODi
spatch.java:39)
        at
org.apache.http.impl.nio.reactor.AbstractIODispatch.inputReady(AbstractIODis
patch.java:114)
        at
org.apache.http.impl.nio.reactor.BaseIOReactor.readable(BaseIOReactor.java:1
62)
        at
org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvent(AbstractIORe
actor.java:337)
        at
org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvents(AbstractIOR
eactor.java:315)
        at
org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor
.java:276)
        at
org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:10
4)
        at
org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(Abs
tractMultiworkerIOReactor.java:588)
        at java.lang.Thread.run(Thread.java:745)

It seems that the pool is exhausted at this point.

The setup of both pools is similar. MaxConnections to 600,
ConnectionRequestTimeout' is set to 1 (because I don't want to wait for a
pooling connection to be free), an IdleConnectionsHandler, etc.

I'm not sure if some connections are not being closed. With the blocking
client one manually released the connection to the pool, but with the async
one I'm not closing connections explicitly (so I suppose this is done
automatically by the async client).

The point is this error was not present with the blocking client. If I'm not
wrong, with the async client the possibility to exhaust the pool should be
more difficult because every time the server is not sending tcp packets the
thread is released and used for other connections. 

Well, whatever the reason I'm going to enable http traces. Since my client
only permitts updates once a week, I want to be sure that I'm enabling the
http traces correctly (otherwise I will have to wait one more week).

With the blocking client I enabled traces putting these lines in the
log4j.xml file (and it worked). Is the same procedure with the async client?

<logger name="org.apache.http">
        <level value="debug"/>
</logger> 

<logger name="org.apache.http.wire">
        <level value="debug"/>
</logger>


Thanks,

Joan.




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