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MSMQ, Windows Services - What can I do to make my system more reliable?

Posted on 2004-08-03
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Last Modified: 2010-04-13
I have a Windows 2000 Server. Files are sent via FTP. A Windows Service with a timer, monitors the FTP folder, and puts a message on a MSMQ. A second Windows Service monitors this queue, and processes the file, specified in the queue message. The rate at which the second process reads the queue is controlled by a timer. Most of the time these processes work fine, but once in a while the second process stops processing the queue, and messages pile up. Have tried to debug the problem, but can not reproduce it. When I restart the second process, it processes all the messages on the queue. Has anyone else had a similar problem? What can I do to make my system more reliable?
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Question by:wsfindlater
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by:BigC666
ID: 11708988
howdy,

have you made sure that the timers anr in sync.
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by:wsfindlater
ID: 11709263
BigC666-
No. Do not understand why they would need to be in sync.. That is why I am using a queue. Do not know how I would put them in scyn..
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by:BigC666
ID: 11709295
what i'm trying to say is, if the second system is stoping and the first is not, then to me it looks like whatever "timer" you are using is loseing it's place some how, thus my coment about time sync.
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by:wsfindlater
ID: 11709616
Using System (not Sytem.Form) timers. Would assume system would keep them in sync. Neither process gets stopped, they just wait for timers.
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by:BigC666
ID: 11709663
ok are you saying that the services don't stop, excuse me i understood that they started and stoped based on your timers.
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by:wsfindlater
ID: 11709755
No, when the timer expires the second process is supposed to check the queue for messages. If there are no messages, or it processes all the existing messages the timer is restared.
Thanks for your responces.
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by:BigC666
ID: 11709821
so then it sounds like the timer doesn't restart automaticly, maby something is causing it to see the queue as not being emptied. i'm just trying to help you think thru the logic.
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by:wsfindlater
ID: 11709921
Well, accually you are right. If there is some hang up in the processing then the timer will not re reset. I should, however, get an error message, unless somting is happening that prevents it.
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BigC666 earned 500 total points
ID: 11709949
have a look at your code where your testing for an empty queue, also are you removing the files after they copy, possibly your testing before the last file is removed and not after or something on that order
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