If you have problems, that you master is dead or have som troubles, and you need to selected a new master, you can do this with this commands:
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xe pool-emergency-transition-to-master |
Then on the others slave you can run this commands:
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xe pool-emergency-reset-master master-address=NewMasterAddress |
And then when the master is running again run this command on the old master
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xe pool-emergency-reset-master master-address=NewMasterAddress |