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...	...	@@ -21,6 +21,9 @@
21	21	start
22	22
23	23	if(调用expireIfNeeded方法判断key是否过期)then(1)
	24	+note left
	25	+返回1代表已经过期
	26	+endnote
24	24	if(当前环境为主节点)then(yes)
25	25	:返回null;
26	26	stop