Re: Multiple instance dying simultaneously?

[Alan Zebchuk]

On 14-Aug-08, at 9:26 PM, Chuck Hill wrote:

On Aug 14, 2008, at 9:48 AM, Alan Zebchuk wrote:

Has anyone ever seen a case where multiple instances of an app become non-responsive almost simultaneously?

The log file has this:

2008-08-14 11:50:22,348 DEBUG MyApp[72021:2023 23] NSLog (ERXNSLogLog4jBridge.java:46) - <com.webobjects.appserver._private.WODefaultAdaptor>: Growing number of WOWorkerThreads to 32 2008-08-14 11:50:52,350 DEBUG MyApp[72020:2009 34] NSLog (ERXNSLogLog4jBridge.java:46) - <com.webobjects.appserver._private.WODefaultAdaptor>: Growing number of WOWorkerThreads to 32

I'd take that as an almost certain sign of deadlock. It might be on the database if this happens to all instances almost simultaneously. It could also be a very sharp, sudden spike in load.

The applications has a fairly consistent load.

Are you dispatching requests concurrently?

But no further information.



Any help is greatly appreciated.

The projects are both using Wonder and have all the automatic editing context locking enabled.

http://www.gvcsitemaker.com/gvc.webobjects/faq&mode=single&recordID=41413

When this happens, get a thread dump of each instance. Without that, you are just guessing.

I have a thread dump. In both cases, there's 1 thread that's IN_NATIVE

Thread [EMAIL PROTECTED]: (state = IN_NATIVE)

 - java.net.ServerSocket.accept() @bci=48, line=421 (Interpreted frame)

 - java.lang.Thread.run() @bci=11, line=613 (Interpreted frame)


And all the other threads are BLOCKED:


Thread [EMAIL PROTECTED]: (state = BLOCKED)
 - java.lang.Object.wait(long) @bci=0 (Interpreted frame)
 - java.lang.Object.wait() @bci=2, line=474 (Interpreted frame)

- java.net.PlainSocketImpl.socketAccept(java.net.SocketImpl) @bci=0 (Interpreted frame) - java.net.PlainSocketImpl.accept(java.net.SocketImpl) @bci=7, line=384 (Interpreted frame) - java.net.ServerSocket.implAccept(java.net.Socket) @bci=50, line=450 (Interpreted frame) - com.webobjects.appserver._private.WOWorkerThread.run() @bci=26, line=238 (Interpreted frame) - com.webobjects.foundation.NSMultiReaderLock$ConditionLock.await() @bci=12, line=506 (Interpreted frame) - com.webobjects.foundation.NSMultiReaderLock._lockForWriting() @bci=92, line=204 (Compiled frame) - com.webobjects.foundation.NSMultiReaderLock.lockForWriting() @bci=8, line=165 (Compiled frame) - com .webobjects .eocontrol .EOEditingContext .objectsWithFetchSpecification (com.webobjects.eocontrol.EOFetchSpecification, com.webobjects.eocontrol.EOEditingContext) @bci=70, line=4112 (Interpreted frame) - er .extensions .eof .ERXEC .objectsWithFetchSpecification (com.webobjects.eocontrol.EOFetchSpecification, com.webobjects.eocontrol.EOEditingContext) @bci=10, line=1109 (Interpreted frame) - com .webobjects .eocontrol .EOEditingContext .objectsWithFetchSpecification (com.webobjects.eocontrol.EOFetchSpecification) @bci=3, line=4500 (Interpreted frame) - com .webobjects .eoaccess .EOUtilities .objectWithPrimaryKey(com.webobjects.eocontrol.EOEditingContext, java.lang.String, com.webobjects.foundation.NSDictionary) @bci=34, line=433 (Interpreted frame) - com .webobjects .eoaccess .EOUtilities .objectWithPrimaryKeyValue(com.webobjects.eocontrol.EOEditingContext, java.lang.String, java.lang.Object) @bci=10, line=405 (Interpreted frame)

Chuck


--
Chuck Hill             Senior Consultant / VP Development


http://www.global-village.net/products/practical_webobjects

Practical WebObjects - for developers who want to increase their overall knowledge of WebObjects or who are trying to solve specific problems.

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