When creating a strongly consistent table, wait for the table's raft
servers to start and be ready to serve queries before completing the
operation. We want the create table operation to absorb the delay of
starting the raft groups instead of the first queries.
The create table coordinator commits and applies the schema statement,
then it waits for all hosts that have a tablet replica to create and
start the raft groups for the table's tablets. It does this by sending
an RPC to all the relevant hosts that executes a group0 barrier, in
order to ensure the table and raft groups are created, then waits for
all raft groups on the host to finish starting and be ready.
Fixes SCYLLADB-807
no backport - strong consistency is still experimental
Closesscylladb/scylladb#28843
* github.com:scylladb/scylladb:
strong_consistency: wait for leader when starting a group
strong_consistency: change wait for groups to start on startup
strong_consistency: optimize wait_for_groups_to_start
strong_consistency: wait for raft servers to start in create table
f3ac35f9d2