requestOutput() call stalls for long periods of time which delays an HTTP
Request for anywhere from 5-60 seconds
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Key: HTTPCORE-155
URL: https://issues.apache.org/jira/browse/HTTPCORE-155
Project: HttpComponents HttpCore
Issue Type: Bug
Components: HttpCore NIO
Affects Versions: 4.0-beta1
Environment: Windows 2003 SP2 - IBM J2RE 1.6.0 build 2.4 - HTTPCore
Beta1 - Dual Core CPU 3.0Ghz - 1Gbps networking
Reporter: Tom McSorley
I'm issuing a second HTTP Request on a connection that has very recently
returned a null for the submitRequest() call... this 2nd request is being
issued approximately 500ms after the submitRequest() null is returned... so the
connection has just been established, an HTTP Request/Response-200 cycle has
completed just prior to this 2nd request being issued. I'm seeing unusually
long delays in the requestOutput() call (verified by surrounding timing
prints)... that can range anywhere from a few milliseconds on up to 60
seconds... It eventually unwinds, and then the submitRequest() is called...
this 2nd request is dispatched and works fine... but, it is delayed
considerably... Is this a known issue and is there a possible work-around?
Here's the JVM related thread information:
The thread being delayed and stuck in the requestOutput() call for a long time
(mostly longer than 5 seconds):
3XMTHREADINFO "pool-2-thread-5" TID:0x2AEECE00, j9thread_t:0x2A7189A8,
state:B, prio=5
3XMTHREADINFO1 (native thread ID:0x1B44, native priority:0x5, native
policy:UNKNOWN)
4XESTACKTRACE at
sun/nio/ch/SelectionKeyImpl.interestOps(SelectionKeyImpl.java:60)
4XESTACKTRACE at
org/apache/http/impl/nio/reactor/IOSessionImpl.setEvent(IOSessionImpl.java:113)
4XESTACKTRACE at
org/apache/http/impl/nio/NHttpConnectionBase.requestOutput(NHttpConnectionBase.java:158)
.... (non important stack information removed)
4XESTACKTRACE at
java/util/concurrent/ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:919)
4XESTACKTRACE at java/lang/Thread.run(Thread.java:735)
Here's the monitor that this thread is blocked and waiting on:
2LKMONINUSE sys_mon_t:0x2A708AF8 infl_mon_t: 0x2A708B30:
3LKMONOBJECT sun/nio/ch/[EMAIL PROTECTED]/00B09214: Flat locked by "I/O
dispatcher 7" (0x2A208E00), entry count 1
3LKWAITERQ Waiting to enter:
3LKWAITER "pool-2-thread-5" (0x2AEECE00)
And here's the thread that currently has this monitor locked:
3XMTHREADINFO "I/O dispatcher 7" TID:0x2A208E00, j9thread_t:0x2A6EC73C,
state:R, prio=5
3XMTHREADINFO1 (native thread ID:0x830, native priority:0x5, native
policy:UNKNOWN)
4XESTACKTRACE at
sun/nio/ch/WindowsSelectorImpl$SubSelector.poll0(Native Method)
4XESTACKTRACE at
sun/nio/ch/WindowsSelectorImpl$SubSelector.poll(WindowsSelectorImpl.java:308(Compiled
Code))
4XESTACKTRACE at
sun/nio/ch/WindowsSelectorImpl$SubSelector.access$500(WindowsSelectorImpl.java(Compiled
Code))
4XESTACKTRACE at
sun/nio/ch/WindowsSelectorImpl.doSelect(WindowsSelectorImpl.java:162(Compiled
Code))
4XESTACKTRACE at
sun/nio/ch/SelectorImpl.lockAndDoSelect(SelectorImpl.java:69(Compiled Code))
4XESTACKTRACE at
sun/nio/ch/SelectorImpl.select(SelectorImpl.java:80(Compiled Code))
4XESTACKTRACE at
org/apache/http/impl/nio/reactor/AbstractIOReactor.execute(AbstractIOReactor.java:121)
4XESTACKTRACE at
org/apache/http/impl/nio/reactor/BaseIOReactor.execute(BaseIOReactor.java:70)
4XESTACKTRACE at
org/apache/http/impl/nio/reactor/AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:318)
4XESTACKTRACE at java/lang/Thread.run(Thread.java:735)
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