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in Hub: registration_timeout must be an integer, but heartmonitor.period is CFloat #1281
In parallel.controller.hub, the registration_timeout is set to max(5000, 2*self.heartmonitor.period) and must be an integer, but self.heartmonitor.period is a float.
So, when the period is more than 2500 (doesn't happen with the default value of 1000; only with user-modified values that are higher), a validation error occurs and the hub doesn't start.