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One thing to note that at the moment the direct ZK access bypasses the CreateTopicPolicy. To maintain the same guarantee, we would consider adding a new field in the RPC to flag this bypass logic.add a whitelist to broker for the two internal topics to bypass topic policy:

1. Transaction log
2. Consumer offset topic

Routing Request Security

For older requests that need redirection, we shall create a new RPC called `Envelope` to embed the actual request. This request will be fully wrapping an older version client request, including its header, security information, actual data fields, etc. The request requires ClusterAction on CLUSTER.

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