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From Dietmar Gräbner <d.graeb...@gmail.com>
Subject Re: UimaAS blocks when accessing a queue with multiple clients concurrently
Date Thu, 09 Dec 2010 08:00:43 GMT
Hi Jaroslaw,

I tried my Example with the RoomNumberAnnotator service - it worked
because it is a primitive service. I only have problems with
aggregates defining delegates.
I tried the Deploy_MeetingFinder.xml in the example folder, but the
service doesn't work. I have to check the Exceptions.

In the attachment you can find the test client. The WorkerThread is a
copy of the RunRemoteAE example shipped with the uima relase. The
MultiThreadedTestClient creates the threads.



On Wed, Dec 8, 2010 at 2:52 AM, Jaroslaw Cwiklik <uimaee@gmail.com> wrote:
> I've created a multi-threaded application that uses a
>  BaseUIMAAsynchronousEngine_impl  instance per thread. Scaled this up to 100
> threads (100 clients). Ran this many times with a single instance of
> RoomNumber Annotator service (from uima as examples). No hangs. Can you try
> to run your application with a simple UIMA AS service like RoomNumber
> Annotator. You can find the deployment descriptor for it in the
> UIMA_HOME/examples/deploy/as.Its called Deploy_RoomNumberAnnotator.xml.
> On Tue, Dec 7, 2010 at 4:54 PM, Eddie Epstein <eaepstein@gmail.com> wrote:
>> 2010/12/7 Dietmar Gräbner <d.graebner@gmail.com>:
>> > I wrote a test client creating multiple threads. Each thread
>> > instantiates a BaseUIMAAsynchronousEngine_impl and invokes a uima
>> > aggregate with the sendAndReceiveCAS() call. When running the program
>> > with e.g. 100 Threads the client gets stuck after processing X calls.
>> FWIW, a similar multithreaded client scenario that has been used with
>> no problems is to instantiate a single BaseUIMAAsynchronousEngine_impl
>> with big enough casPool and have each thread call sendAndReceiveCAS()
>> using the common API object.
>> Eddie

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