Hello, Jan-Piet, 
  
> however, when I stop and restart the consumer server, I have sometimes (not 
> always) seen 
> 
> catz: catz_addmodzone_cb: zone 'z10.aa' will not be added because another 
> catalog zone already contains an entry with that zone 
>
>which is true, but it doesn't _seem_ to cause issues. 

That's just working as designed. If a member zone exists in both catz1 and 
catz2 catalog zones, and catz1 has a defined "coo" change of ownership property 
allowing a given member zone to be transferred to catz2, then there are two 
scenarios when a catalog zone consumer starts up: 
  
1. It loads the member zone from catz1 first, then it sees the member zone 
exists also in catz2, and the "coo" property allows that, then the zone will be 
transferred from catz1 to catz2. 
  
2. It loads the member zone from catz2 first, then it sees the member zone 
exists also in catz1, and there is no "coo" property allowing it to transfer 
from catz2 to catz1, so it emits the log message that you have seen, and 
continues serving the member zone from catz2. 
  
That's why it's recommended to remove the transferred member zone from catz1, 
once it is established that all the consumers have successfully processed the 
change of ownership operation. 
  
Aram 
 
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