Currently it waits for topology state machine to be idle, so it allows
one tablet to be moved at a time. We should allow it to start migration
if the current transition state is
- topology::transition_state::tablet_migration or
- topology::transition_state::tablet_draining
to allow starting parallel tablet movement. That will be useful when
scripting a custom rebalancing algorithm.
in this change, we wait until the topology state machine is idle or
it is at either of the above two states.
Fixes#16437
Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>
Closesscylladb/scylladb#17203
876478b84f