Return immediately if compareandswap updates the maxUidSeen. (#5224)

Small optimiaztion to avoid reading the atomic once again after the value is successfully updated.
dgraph-io · Apr 16, 2020 · 8d7c649 · 8d7c649
1 parent 3118269
commit 8d7c649
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/xidmap/xidmap.go b/xidmap/xidmap.go
@@ -191,7 +191,9 @@ func (m *XidMap) updateMaxSeen(max uint64) {
 		if prev >= max {
 			return
 		}
-		atomic.CompareAndSwapUint64(&m.maxUidSeen, prev, max)
+		if atomic.CompareAndSwapUint64(&m.maxUidSeen, prev, max) {
+			return
+		}
 	}
 }