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| Load Balancing |
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| Ratan |
 Posted: Fri Apr 02, 2004 9:01 am Post subject: Load Balancing |
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Grand Master
Joined: 18 Jul 2002
Posts: 1245
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Here is my scenario:
I have 2 WF servers (3.4.4) on two boxes(same Group) and a WF CLient (3.4.4, Client with QM)
When both the WF Systems are running, I dont have a problem Loggin in, but when I take down one of the WF Systems and leave the QM running, I cant login to WF Server anymore from the Client (I am not specifying the system name to connect to from the client).
When I take both QM and WF System on one machine down, I can login from the client (logsin to the system that is running). I believe this is being taken care of the MQ Cluster load balancing.
I am unable to understand, why I am not able to login to the running WF System, when one WF Server is down with QM in that system running.
If MQ Cluster load balancing is taking charge and sending requests to the failed WF Server as the QM there is still running, I would expect alternative login requests to be succesfull, as one of the WF Systems is running.
Any thoughts???
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-Ratan |
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| vennela |
| Posted: Fri Apr 02, 2004 10:34 am Post subject: |
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Jedi Knight
Joined: 11 Aug 2002
Posts: 4055
Location: Hyderabad, India
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I would anticipate this behaviour.
When a client tries to login, there will be a message put on some queue and this message will be carried over by MQ to the workflow server to process and respond back.
When there are two workflow servers then, the login requests that are put on this queue will be round robinned to the two workflow server QMGRs and the workflow server would process the login requests and reply to those requests.
Say if the workflow server is down while the QMGR of that server is still up, MQ cluster has no idea that the workflow server is down. It will still keep sending the requests to both the QMGRs. The only difference now is, on the QMGR where the workflow server is down, there is nobody to process the workflow requsets sent by the client.
If you take down the workflow server while keep the QMGR running and try to issue a login, I would bet on some of the queues on the QMGR where the workflow server is not running CURDEPTH will increase. |
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| Ratan |
| Posted: Fri Apr 02, 2004 11:08 am Post subject: |
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Grand Master
Joined: 18 Jul 2002
Posts: 1245
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Venny, I agree with you. I know the requests will round robin. So I expect atleast alternative Login requests will be succesfull, but all the request fail. In MQ queue, I see all Requests pilling up on the failed MQWF box.
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