ClosedChannelException causes IOReactor to shut down
----------------------------------------------------
Key: HTTPCORE-169
URL: https://issues.apache.org/jira/browse/HTTPCORE-169
Project: HttpComponents HttpCore
Issue Type: Bug
Components: HttpCore NIO
Affects Versions: 4.0-beta2
Reporter: Anders Wallgren
Priority: Critical
Attachments: AbstractIOReactor.patch,
AbstractMultiworkerIOReactor.patch
I've finally had time to track down a problem that's been happening
intermittently for the past few weeks.
The symptom of the problem is that the IOReactor shuts down during one of our
unit tests (always the same test).
The test before the test that fails cancels an NIO session request before it
completes, and I believe what might be happening is this session request ends
up being processed by the IOReactor during the next test (the IOReactor remains
running between these tests).
AbstractIOReactor.processNewChannels calls
AbstractSelectableChannel.configureBlocking, which throws a
ClosedChannelException.
AbstractIOReactor.processNewChannels reacts to this by throwing an
IOReactorException, which in turn causes AbstractMultiworkerIOReactor.execute
to call doShutdown.
This is an expected error condition, so it shouldn't cause the IOReactor to
exit.
I'm including some supporting stack traces below -- note that I added some
logging to the 4.0-beta2 code, so I'm also including patch files so line
numbers can line up (though you probably won't need them -- the problem seems
straightfoward to me).
The ClosedChannelException happens:
2008-08-17T16:35:27.424 | DEBUG | ntHttpManager |
| AbstractMultiworkerIOReactor | Worker exception in execute()
org.apache.http.nio.reactor.IOReactorException: Failure registering channel
with the selector
at
org.apache.http.impl.nio.reactor.AbstractIOReactor.processNewChannels(AbstractIOReactor.java:227)
at
org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:158)
at
org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:70)
at
org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:341)
at java.lang.Thread.run(Thread.java:619)
at
com.electriccloud.util.queue.CommanderThread.run(CommanderThread.java:94)
Caused by: java.nio.channels.ClosedChannelException
at
java.nio.channels.spi.AbstractSelectableChannel.configureBlocking(AbstractSelectableChannel.java:252)
at
org.apache.http.impl.nio.reactor.AbstractIOReactor.processNewChannels(AbstractIOReactor.java:224)
... 5 more
Right after that, the shutdown happens:
2008-08-17T16:35:27.425 | INFO | ntHttpManager |
| AbstractIOReactor | gracefulShutdown: [EMAIL
PROTECTED]
java.lang.Exception: Stack trace from gracefulShutdown
at
org.apache.http.impl.nio.reactor.AbstractIOReactor.gracefulShutdown(AbstractIOReactor.java:338)
at
org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor.doShutdown(AbstractMultiworkerIOReactor.java:240)
at
org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor.execute(AbstractMultiworkerIOReactor.java:203)
at
com.electriccloud.commander.agent.AgentSocketManager.innerRun(AgentSocketManager.java:280)
at
com.electriccloud.util.FailsafeRunnable.run(FailsafeRunnable.java:136)
at java.lang.Thread.run(Thread.java:619)
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