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| Failover Logic to secondary QM in JAVA |
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| PeterPotkay |
 Posted: Wed Oct 23, 2002 9:30 am Post subject: Failover Logic to secondary QM in JAVA |
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Poobah
Joined: 15 May 2001
Posts: 7722
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I am trying to code some logic that will automatically attempt to connect to a secondary server/queue manager should the first become unavailable. The question is, what error codes should this method check for that would indicate a queue manager being unavailable?
So far, I think
2009 (MQRC_CONNECTION_ERROR),
2059 (MQRC_Q_MGR_NOT_AVAILABLE),
2161 (MQRC_Q_MGR_QUIESCING),
2162 (MQRC_Q_MGR_STOPPING)
will cover it. Am I missing any that should be added to this method?
_________________
Peter Potkay
Keep Calm and MQ On |
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| educos |
| Posted: Tue Nov 19, 2002 8:00 am Post subject: |
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Apprentice
Joined: 18 Jul 2001
Posts: 34
Location: Salt Lake City, UT
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I built a similar component that retries its connection to a queue manager (rather than go look for another one). When you run your code local to the queue manager, the reason codes you have documented in your email are sufficient. However, when you access the queue manager using host/port/channel, you also get MQRC_UNEXPECTED_ERROR. The list I handle below allows me to recover in every case, regardless of how brutally I break the connection and regardless of whether my code run locally or remotely from the queue manager.
MQException.MQRC_CONNECTION_BROKEN,
MQException.MQRC_HCONN_ERROR,
MQException.MQRC_Q_MGR_NOT_AVAILABLE,
MQException.MQRC_Q_MGR_QUIESCING,
MQException.MQRC_Q_MGR_STOPPING,
MQException.MQRC_UNEXPECTED_ERROR,
MQException.MQRC_OPEN_FAILED,
MQException.MQRC_MAX_CONNS_LIMIT_REACHED
Regards, |
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| educos |
| Posted: Wed Nov 20, 2002 7:03 am Post subject: |
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Apprentice
Joined: 18 Jul 2001
Posts: 34
Location: Salt Lake City, UT
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| You may, however, run into another issue after you reestablish a connection. See the "Ghost queue monitoring threads" topic in this forum... |
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