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And keep per node information (idx, host_id, endpoint, dc_rack, is_pending) in node objects, indexed by topology on several indices like: idx, host_id, endpoint, current/pending, per dc, per dc/rack. The node index is a shorthand identifier for the node. node* and index are valid while the respective topology instance is valid. To be used, the caller must hold on to the topology / token_metadata object (e.g. via a token_metadata_ptr or effective_replication_map) Refs #6403 Signed-off-by: Benny Halevy <bhalevy@scylladb.com> topology: add node idx Signed-off-by: Benny Halevy <bhalevy@scylladb.com>