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From "Dominique Mongelli (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HTTPCORE-414) HTTP Connection closed when polling an API every 5 seconds
Date Wed, 18 Nov 2015 14:43:10 GMT
Dominique Mongelli created HTTPCORE-414:
-------------------------------------------

             Summary: HTTP Connection closed when polling an API every 5 seconds
                 Key: HTTPCORE-414
                 URL: https://issues.apache.org/jira/browse/HTTPCORE-414
             Project: HttpComponents HttpCore
          Issue Type: Bug
          Components: HttpCore NIO
    Affects Versions: 4.4.4
         Environment: OS : Linux Ubuntu 14.04 LTS
Software : Java 1.8
Java source code available at the following link :
https://gist.github.com/dominiquemongelli/34e3588c5a1436276dff#file-httpcoreniosample
The java program uses the following libraries :
- httpclient 4.5.1
- httpcore-nio 4.4.4
- httpasyncclient 4.1
- httpcore 4.4.4
            Reporter: Dominique Mongelli
            Priority: Minor


Scenario to reproduce the bug :
- The java source code simulates 10 pollings on the following API  http://www.typeunsafe.org/api/temperatures/69
(using httpasyncclient) with 5 seconds polling frequency.
- Compile and run the source code provided.
- Current result : after some polling correctly done, the execution throws the following exception
:
{code:title=|borderStyle=solid}
Exception in thread "main" java.util.concurrent.ExecutionException: org.apache.http.ConnectionClosedException:
Connection closed
	at org.apache.http.concurrent.BasicFuture.getResult(BasicFuture.java:70)
	at org.apache.http.concurrent.BasicFuture.get(BasicFuture.java:80)
	at HttpCoreSample.main(HttpCoreSample.java:31)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:483)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
Caused by: org.apache.http.ConnectionClosedException: Connection closed
	at org.apache.http.nio.protocol.HttpAsyncRequestExecutor.endOfInput(HttpAsyncRequestExecutor.java:321)
	at org.apache.http.impl.nio.DefaultNHttpClientConnection.consumeInput(DefaultNHttpClientConnection.java:263)
	at org.apache.http.impl.nio.client.InternalIODispatch.onInputReady(InternalIODispatch.java:81)
	at org.apache.http.impl.nio.client.InternalIODispatch.onInputReady(InternalIODispatch.java:39)
	at org.apache.http.impl.nio.reactor.AbstractIODispatch.inputReady(AbstractIODispatch.java:116)
	at org.apache.http.impl.nio.reactor.BaseIOReactor.readable(BaseIOReactor.java:164)
	at org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvent(AbstractIOReactor.java:339)
	at org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvents(AbstractIOReactor.java:317)
	at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:278)
	at org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:106)
	at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:590)
	at java.lang.Thread.run(Thread.java:745)
{code}

Important things to mention :
- The issue does not occur with another API (for example API https://api.bitcoinaverage.com/ticker/global/EUR/)
- The issue is reproductible only with a 5 seconds polling frequency. If polling frequency
is set to 10 seconds, then the issue is not reproductible anymore.
The polling frequency can be updated via :
{code:title= |borderStyle=solid}
Thread.sleep(POLLING_FREQUENCY_IN_MS);
{code}
- The API uses within the source code (http://www.typeunsafe.org/api/temperatures/69) can
return a 304 http status when no data has been updated.
- The API uses a Varnish cache layer.



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