When a compaction_group is removed via `compaction_manager::remove`,
it is erase from `_compaction_state`, and therefore compaction
is definitely not enabled on it.
This triggers an internal error if tablets are cleaned up
during drop/truncate, which checks that compaction is disabled
in all compaction groups.
Note that the callers of `compaction_disabled` aren't really
interested in compaction being actively disabled on the
compaction_group, but rather if it's enabled or not.
A follow-up patch can be consider to reverse the logic
and expose `compaction_enabled` rather than `compaction_disabled`.
Fixesscylladb/scylladb#20060
Signed-off-by: Benny Halevy <bhalevy@scylladb.com>
Closesscylladb/scylladb#21378
78ceaeabca