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| When one of the FULL Respository is not available. |
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| JohnSmith |
 Posted: Tue Jul 30, 2013 2:18 am Post subject: When one of the FULL Respository is not available. |
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Voyager
Joined: 17 Mar 2010
Posts: 86
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Hello ,
I got a question while reading documentation on MQ clustering , it says
| Quote: |
If at least one FR is not available or
they are not fully connected
– Cluster definition changes via FRs will not flow |
lets assume a setup of 3 queue managers - QM1(partial), QM2(FULL) and QM3(FULL), QM4 (partial). Now QM1(partial) has a manually defined CLUSSDR channel to QM2(FULL), now if QM2 Queue manager goes down or the corresponding server goes down or if the link is broken, then any changes in MQ objects on QM1 will not go to Full Repository QM3? and QM4 will not be aware of those changes in QM1?
that defeats the purpose here for MQ clustering, what do you say guys? |
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| exerk |
| Posted: Tue Jul 30, 2013 2:33 am Post subject: |
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Jedi Council
Joined: 02 Nov 2006
Posts: 6339
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If no FR is available:
Any change to a cluster object in a PR cannot be communicated to any other member of the cluster.
If two FRs are not fully connected:
Any change to a cluster object in a PR will be communicated to the FR to which it can connect but will not be published by that FR to the other FR, and therefore will not be published to other PRs connected to the other FR.
If the 'primary' FR is unavailable: *
Any change to a cluster object in a PR will be communicated to the FR to which it can connect.
Clustering 101:
Make sure your FRs can talk to each other!
* By 'primary' I mean the FR that the PR was initially connected to when it joined the cluster; that FR would then publish the location of the other FR to the PR.
_________________
It's puzzling, I don't think I've ever seen anything quite like this before...and it's hard to soar like an eagle when you're surrounded by turkeys. |
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| hughson |
| Posted: Tue Jul 30, 2013 2:43 am Post subject: Re: When one of the FULL Respository is not available. |
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Padawan
Joined: 09 May 2013
Posts: 1959
Location: Bay of Plenty, New Zealand
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| JohnSmith wrote: |
| lets assume a setup of 3 queue managers - QM1(partial), QM2(FULL) and QM3(FULL), QM4 (partial). Now QM1(partial) has a manually defined CLUSSDR channel to QM2(FULL), now if QM2 Queue manager goes down or the corresponding server goes down or if the link is broken, then any changes in MQ objects on QM1 will not go to Full Repository QM3? and QM4 will not be aware of those changes in QM1? |
QM1(partial) will also have a channel to QM3(FULL) and changes to the cluster will be sent to both QM2(FULL) and QM3(FULL).
All the messages for QM2(FULL) will sit on the XmitQ until it is back on-line.
All the messages for QM3(FULL) will be delivered and any interested parties (e.g. QM4(partial)) will be informed of the changes.
Cheers
Morag
_________________
Morag Hughson @MoragHughson
IBM MQ Technical Education Specialist
Get your IBM MQ training here!
MQGem Software |
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| bruce2359 |
| Posted: Tue Jul 30, 2013 5:26 am Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9469
Location: US: west coast, almost. Otherwise, enroute.
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Presuming that the two FRs are fully interconnected, if one of them fails, the remaining FR will provide FR services to the PRs. Clustering software on PRs will automatically create clussdr channels to the remaining FR. When PRs join the cluster, they will be sent clusrcvr info of the other FR, in case the chosen FR fails.
If FRs also host applications, it is possible that app msgs might be stranded on the failed FR.
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ב''ה
Lex Orandi, Lex Credendi, Lex Vivendi. As we Worship, So we Believe, So we Live. |
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