We can cache tablet map in erm, to avoid looking it up on every write for
getting write replicas. We do that in tablet_sharder, but not in tablet
erm. Tablet map is immutable in the context of a given erm, so the
address of the map is stable during erm lifetime.
This caught my attention when looking at perf diff output
(comparing tablet and vnode modes).
It also helps when erm is called again on write completion for
checking locality, used for forwarding info to the driver if needed.
Signed-off-by: Raphael S. Carvalho <raphaelsc@scylladb.com>
Closesscylladb/scylladb#18158
12714a4123