"I/O dispatch worker terminated abnormally" casued by NPE with extremely low
timeout settings
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Key: HTTPCORE-180
URL: https://issues.apache.org/jira/browse/HTTPCORE-180
Project: HttpComponents HttpCore
Issue Type: Bug
Components: HttpCore NIO
Affects Versions: 4.0-beta3, 4.0-beta2
Environment: java version "1.6.0_10"
Java(TM) SE Runtime Environment (build 1.6.0_10-b33)
Java HotSpot(TM) Server VM (build 11.0-b15, mixed mode)
Reporter: Chas W
Priority: Minor
I'm running a high throughput nio http client (essentially a small webcrawler)
through the apache HttpCore NIO extensions -- my code is based largely off the
sample client at
http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-nio/src/examples/org/apache/http/examples/nio/NHttpClient.java.
I've manually set both the 'connection timeout' and 'socket timeout' limits
to 1ms, in order to force timeouts to test a portion of my code.
After doing so, I repeatedly get the following error: "I/O dispatch worker
terminated abnormally"; it's an IOException thrown from the 'ioReactor.execute'
part of the sample code mentioned above. I get it when requesting high volumes
of URLs -- it sometimes occours very quickly, or other times won't happen for
up to 10 minutes or so.
Here's the printStackTrack output for the 'getCause()' method on the
IOexception:
java.lang.NullPointerException
at
org.apache.http.nio.protocol.AsyncNHttpClientHandler.closed(AsyncNHttpClientHandler.java:115)
at
org.apache.http.nio.protocol.BufferingHttpClientHandler.closed(BufferingHttpClientHandler.java:98)
at
org.apache.http.impl.nio.DefaultClientIOEventDispatch.disconnected(DefaultClientIOEventDispatch.java:93)
at
org.apache.http.impl.nio.reactor.BaseIOReactor.sessionClosed(BaseIOReactor.java:222)
at
org.apache.http.impl.nio.reactor.AbstractIOReactor.processClosedSessions(AbstractIOReactor.java:277)
at
org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:150)
at
org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:70)
at
org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:362)
at java.lang.Thread.run(Thread.java:619)
Even though the error seems to stem from the httpcore library, I've
commented out all of my code to see if it fixes the problem -- it doesn't. I
tried upgrading from the 4.0-beta2 to the 4.0-beta3 release -- this also does
not solve the problem.
Again, this problem only occours when connection timeout and socket
timeout are set extremely low (1ms), and does not seem to occour with normal
timeout values.
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