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e089c22ec1
The function complexity if O(#tokens) in the worst case as for each endpoint token to traverses _token_to_endpoint_map lineraly to erase the endpoint mapping if it exists. This change renames the current implementation of update_normal_tokens to update_normal_tokens_sync and clones the code as a coroutine that returns a future and may yield if needed. Eventually we should futurize the whole token_metadata and abstract_replication_strategy interface and get rid of the synchronous functions. Until then the sync version is still required from call sites that are neither returning a future nor run in a seastar thread. Signed-off-by: Benny Halevy <bhalevy@scylladb.com>