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We need a separate transition kind for intra node migration so that we don't have to recover this information from replica set in an expensive way. This information is needed in the hot path - in effective_replicaiton_map, to not return the pending tablet replica to the coordinator. From its perspective, replica set is not transitional. The transition will also be used to alter the behavior of the sharder. When not in intra-node migration, the sharder should advertise the shard which is either in the previous or next replica set. During intra-node migration, that's not possible as there may be two such shards. So it will return the shard according to the current read selector.
Scylla developer documentation
This folder contains developer-oriented documentation concerning the ScyllaDB codebase. We also have a wiki, which contains additional developer-oriented documentation. There is currently no clear definition of what goes where, so when looking for something be sure to check both.
Seastar documentation can be found here.
User documentation can be found on docs.scylladb.com
For information on how to build Scylla and how to contribute visit HACKING.md and CONTRIBUTING.md.