It's better to wait on deregistering the
old main compaction_groups:s in handle_tablet_split_completion
rather than leaving work in the background.
Especially since their respective storage_groups
are being destroyed by handle_tablet_split_completion.
handle_tablet_split_completion keeps a continuation chain
for all non-ready compaction_group stop fibers.
and returns it so that update_effective_replication_map
can await it, leaving no cleanup work in the background.
Signed-off-by: Benny Halevy <bhalevy@scylladb.com>
f2ff701489