[Tarantool-patches] [PATCH] txn_limbo: simplify owner migration condition

[Cyrill Gorcunov via Tarantool-patches <tarantool-patches@dev.tarantool.org>]

When limbo owner is about to change the state
we should check is if there are some pending
transactions are not yet processed, iow if
queue is empty. No need to test if current limbo
owner is zero. The owner is set to zero once --
when limbo is created during initialization.

After all I think even if owner would ever zero
and we're about to change it the queue simply
must be empty, that is the only safe state.

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
---
Guys, I don't want to create a separate branch for this
small patch neither I consider it anyhow significant. More
likely it is a cleanup dropping redundant code. Discovered
while trying to figure out details of qsync.

 src/box/txn_limbo.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/box/txn_limbo.c b/src/box/txn_limbo.c
index addcb0f97..2a10bd0ae 100644
--- a/src/box/txn_limbo.c
+++ b/src/box/txn_limbo.c
@@ -94,8 +94,7 @@ txn_limbo_append(struct txn_limbo *limbo, uint32_t id, struct txn *txn)
 		id = instance_id;
 	bool make_ro = false;
 	if (limbo->owner_id != id) {
-		if (limbo->owner_id == REPLICA_ID_NIL ||
-		    rlist_empty(&limbo->queue)) {
+		if (rlist_empty(&limbo->queue)) {
 			limbo->owner_id = id;
 			limbo->confirmed_lsn = 0;
 			if (id != instance_id)
-- 
2.30.2