Blocker Description
When a KRaft controller fails over, the existing migration driver (in dual write mode) can fail in between Zookeeper writes and may leave Zookeeper with incomplete and inconsistent data. So when a new controller becomes active (and by extension new migration driver becomes active), this first thing we should do is load the in-memory snapshot and use it to write metadata to Zookeeper to have a steady state. We currently do not do this and it may leave Zookeeper in inconsistent state.
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