Use random timeout for deadlock recheck

knizhnik · dmpgpro · commit b268e276cc25 · 2018-04-16T12:46:01.000+03:00
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
@@ -1675,7 +1675,7 @@ CheckDeadLock(void)
 	 */
 	if (!pg_atomic_test_set_flag(&ProcGlobal->activeDeadlockCheck))
 	{
-		enable_timeout_after(DEADLOCK_TIMEOUT, DeadlockTimeout);
+		enable_timeout_after(DEADLOCK_TIMEOUT, (DeadlockTimeout/2) + (random() % (DeadlockTimeout/2)));
 		return;
 	}
 	inside_deadlock_check = true;

Original file line number	Diff line number	Diff line change
`@@ -1675,7 +1675,7 @@ CheckDeadLock(void)`
`1675`	`1675`	`*/`
`1676`	`1676`	`if (!pg_atomic_test_set_flag(&ProcGlobal->activeDeadlockCheck))`
`1677`	`1677`	`{`
`1678`		`- enable_timeout_after(DEADLOCK_TIMEOUT, DeadlockTimeout);`
	`1678`	`+ enable_timeout_after(DEADLOCK_TIMEOUT, (DeadlockTimeout/2) + (random() % (DeadlockTimeout/2)));`
`1679`	`1679`	`return;`
`1680`	`1680`	`}`
`1681`	`1681`	`inside_deadlock_check = true;`