Additional tests on AIX

Wed Jul 8 09:44:32 EDT 2009

I guess this fix does not work.  Let me reply once again when the
correct fix lands down.

On 07/08/2009 10:38 PM, 이희승 (Trustin Lee) wrote:
> I think it's the constraint level autodetector that keeps the server
> from shutting down.  I didn't modify the autodetector at all, so it's
> weird that it fails in AIX.
> 
> I've just checked in the workaround for this problem at revision 1536.
> Could you confirm?
> 
> Thanks,
> Trustin
> 
> On 07/08/2009 09:40 PM, Frederic Bregier wrote:
>> Hi Trustin,
>> No problem! I'm using the exact same code than before.
>>
>> Sadly, it seems a bug comes back... but it is not stable...
>>
>> Using JDK6 on AIX, I've got two kinds of running: (java is run without any
>> special argument)
>>
>> A) When it is ok
>> - Netty server first says : (after 1 seconds or so)
>> 8 juil. 2009 14:30:00 org.jboss.netty.channel.socket.nio.NioProviderMetadata
>> null
>> INFO: Using the autodetected NIO constraint level: 1 (Use better NIO
>> provider for better performance)
>>
>> - Then when the client starts, the server says before exiting normally:
>> Channel connected
>> Msg received and will close channel
>> Close channel
>> Free main
>> Close child channel
>> End of server
>> Close main channel
>>
>> I've got exactly the same when using JDK5 (and stable then).
>>
>>
>> B) When it is KO (only JDK6 from time to time, until now, each 1 on 3 runs)
>> - Netty server first says : (after 6 seconds or so)
>> 8 juil. 2009 14:10:09 org.jboss.netty.channel.socket.nio.NioProviderMetadata
>> null
>> WARNING: NIO constraint level autodetection timed out.
>> 8 juil. 2009 14:10:09 org.jboss.netty.channel.socket.nio.NioProviderMetadata
>> null
>> WARNING: Failed to autodetect the NIO constraint level; using the safest
>> level (2)
>>
>> - Then when the client starts, the server says before it hangs:
>> Channel connected
>> Msg received and will close channel
>> Close channel
>> Free main
>> Close child channel
>> End of server
>> Close main channel
>>
>> - If I try to launch a new client, the new client says:
>> Connect to server 3333
>> Exception in thread "main" java.net.ConnectException: Un hôte distant a
>> rejeté une tentative de connexion (connect).
>>         at sun.nio.ch.Net.connect(Native Method)
>>         at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:507)
>>         at socket.client.Client.main(Client.java:49)
>> So it cannot connect to the server and the server does not answear neither
>> it stops.
>>
>> So a bug comes back, slightly different than previously since now if I
>> connect a second client later on after the server hangs, the server will not
>> stop however as before.
>>
>> For me (if I'm not wrong), there is something that badly happens during the
>> NIO constraint level autodetection. If the autodetection is ok, then level
>> is 1 and the test is perfectly ok. If the autodetection hangs for any reason
>> (around 6 seconds), then level is 2 and the test is KO...
>>
>> Here is the java dump when the server hangs:
>>
>>  Full thread dump J9 VM (J2RE 6.0 IBM J9 2.4 AIX ppc64-64 build
>> jvmap6460sr4ifx-20090409_3325420090409_033254_BHdSMr, native threads):
>>       "JIT Compilation Thread" TID:0x0000000111CB1700,
>> j9thread_t:0x00000001101248A0, state:CW, prio=10
>>             (native thread ID:0x25C04D, native priority:0xB, native
>> policy:UNKNOWN)
>>       "Signal Dispatcher" TID:0x0000000111E4ED00,
>> j9thread_t:0x0000000111D94320, state:R, prio=5
>>             (native thread ID:0x15A039, native priority:0x5, native
>> policy:UNKNOWN)
>>           at com/ibm/misc/SignalDispatcher.waitForSignal(Native Method)
>>           at com/ibm/misc/SignalDispatcher.run(SignalDispatcher.java:54)
>>       "Gc Slave Thread" TID:0x000000011206BD00,
>> j9thread_t:0x0000000111F8FC40, state:CW, prio=5
>>             (native thread ID:0x26F0F7, native priority:0x5, native
>> policy:UNKNOWN)
>>       "NIO constraint level detector" TID:0x0000000112A97000,
>> j9thread_t:0x0000000112A8A060, state:B, prio=5
>>             (native thread ID:0x25A033, native priority:0x5, native
>> policy:UNKNOWN)
>>           at
>> sun/nio/ch/SelectionKeyImpl.nioInterestOps(SelectionKeyImpl.java:103)
>>           at
>> sun/nio/ch/SelectionKeyImpl.interestOps(SelectionKeyImpl.java:65)
>>           at
>> org/jboss/netty/channel/socket/nio/NioProviderMetadata$ConstraintLevelAutodetector.autodetectWithoutTimeout(NioProviderMetadata.java:341)
>>           at
>> org/jboss/netty/channel/socket/nio/NioProviderMetadata$ConstraintLevelAutodetector$1.run(NioProviderMetadata.java:251)
>>           at
>> org/jboss/netty/util/ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:110)
>>           at java/lang/Thread.run(Thread.java:735)
>>       "pool-3-thread-1" TID:0x0000000112959000,
>> j9thread_t:0x0000000112A8A560, state:R, prio=5
>>             (native thread ID:0x2580DF, native priority:0x5, native
>> policy:UNKNOWN)
>>           at sun/nio/ch/PollArrayWrapper.poll0(Native Method)
>>           at sun/nio/ch/PollArrayWrapper.poll(PollArrayWrapper.java:116)
>>           at sun/nio/ch/PollSelectorImpl.doSelect(PollSelectorImpl.java:57)
>>           at sun/nio/ch/SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
>>           at sun/nio/ch/SelectorImpl.select(SelectorImpl.java:80)
>>           at
>> org/jboss/netty/channel/socket/nio/NioProviderMetadata$SelectorLoop.run(NioProviderMetadata.java:454)
>>           at
>> java/util/concurrent/ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:896)
>>           at
>> java/util/concurrent/ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
>>           at java/lang/Thread.run(Thread.java:735)
>>       "DestroyJavaVM helper thread" TID:0x0000000112A95A00,
>> j9thread_t:0x0000000110123EA0, state:CW, prio=5
>>             (native thread ID:0x2690EB, native priority:0x5, native
>> policy:UNKNOWN)
>>
>> HTH,
>> Frederic
>>
>>
>> Trustin Lee wrote:
>>> Hi Frederic,
>>>
>>> I've just updated the NIO socket accept code which might affect the
>>> previous fix for AIX freeze.  Would you mind if you test if revision
>>> 1534 works for your AIX?
>>>
>>> Thanks in advance!
>>> Trustin
>>> _______________________________________________
>>> netty-dev mailing list
>>> netty-dev at lists.jboss.org
>>> https://lists.jboss.org/mailman/listinfo/netty-dev
>>>
>>>
>>
>> -----
>> Hardware/Software Architect
> 