I added two brokers (brokerId 4,5) to a 3-node (brokerId 1,2,3) cluster where there were 32 topics and 64 partitions on each, replication 3.
Running reassigning partitions.
On each run, I can see the following WARN messages, but when the reassignment partition process finishes, it all seems OK. ISR is OK (count is 3 in every partition).
But I get the following messages types, one per partition:
-> This relates to cache, so I suppose it's pretty safe.
-> This is scary. I'm not sure about the severity of this, but it looks like it may be missing records?
-> Here, these partitions are created.
First of all - am I supposed to be missing data here? I am assuming I don't, and so far I don't see traces of losing anything.
If so, I'm not sure what these messages are trying to say here. Should they really be at WARN level? If so - should the message clarify better the different risks involved?