[Tarantool-patches] [PATCH 1/5] box: update comment describing join protocol

[sergepetrenko <sergepetrenko@tarantool.org>]

From: Serge Petrenko <sergepetrenko@tarantool.org>

The comment states that relay sends the latest snapshot to replica
during initial join, however, this was changed in commit
6332aca655ae7f95d391bdc0109e79915f6e6ad0 (relay: join new replicas off
read view).
Now relay sends rows from the read view created at the moment of join.
Update the comment to match.

Follow-up #1271
---
 src/box/box.cc | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/box/box.cc b/src/box/box.cc
index b119c927b..76fe0d534 100644
--- a/src/box/box.cc
+++ b/src/box/box.cc
@@ -1391,13 +1391,14 @@ box_process_join(struct ev_io *io, struct xrow_header *header)
 	 * => JOIN { INSTANCE_UUID: replica_uuid }
 	 * <= OK { VCLOCK: start_vclock }
 	 *    Replica has enough permissions and master is ready for JOIN.
-	 *     - start_vclock - vclock of the latest master's checkpoint.
+	 *     - start_vclock - master's vclock at the time of join.
 	 *
 	 * <= INSERT
 	 *    ...
 	 *    Initial data: a stream of engine-specifc rows, e.g. snapshot
-	 *    rows for memtx or dirty cursor data for Vinyl. Engine can
-	 *    use REPLICA_ID, LSN and other fields for internal purposes.
+	 *    rows for memtx or dirty cursor data for Vinyl fed from a read-view.
+	 *    Engine can use REPLICA_ID, LSN and other fields for internal
+	 *    purposes.
 	 *    ...
 	 * <= INSERT
 	 * <= OK { VCLOCK: stop_vclock } - end of initial JOIN stage.
-- 
2.20.1 (Apple Git-117)