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6946ad2a45
Tablet sharder is adjusted to handle intra-migration where a tablet can have two replicas on the same host. For reads, sharder uses the read selector to resolve the conflict. For writes, the write selector is used. The old shard_of() API is kept to represent shard for reads, and new method is introduced to query the shards for writing: shard_for_writes(). All writers should be switched to that API, which is not done in this patch yet. The request handler on replica side acts as a second-level coordinator, using sharder to determine routing to shards. A given sharder has a scope of a single topology version, a single effective_replication_map_ptr, which should be kept alive during writes.