The persisted snapshot index may be 0 if the snapshot was created in
older version of Scylla, which means snapshot transfer won't be
triggered to a bootstrapping node. Commands present in the log may not
cover all schema changes --- group 0 might have been created through the
upgrade upgrade procedure, on a cluster with existing schema. So a
deployment with index=0 snapshot is broken and we need to fix it. We can
use the new `raft::server::trigger_snapshot` API for that.
Also add a test.
Fixesscylladb/scylladb#16683Closesscylladb/scylladb#17072
* github.com:scylladb/scylladb:
test: add test for fixing a broken group 0 snapshot
raft_group0: trigger snapshot if existing snapshot index is 0
(cherry picked from commit 181f68f248)
390414c99e