THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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When handling a CreateTopics or CreatePartitions request, in case not enough brokers are available to satisfy the replication factor, placeholder replica ids (-1, -2, -3) will be inserted for the missing replicas. In case a topic or partition is created under-replicated, the error code will still be NONE in the CreateTopics and CreatePartition responses.
When a new broker joins the cluster, the controller will check if any partitions have placeholders replicas ids and if so assign this broker as a replica (only if this broker is not already a replica).
This may lead to some topics/partitions not optimally spread across all racks. This can , but note that this may already happen (without this KIP) when topics/partitions are created while all brokers in a rack are offline (ie: an availability zone is offline). Tracking topics/partitions not optimally spread across all racks can be tackled in a follow up KIP.
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