The key not existed in bucket whose ops is very high

My cluster has three buckets,and 8 nodes. In one bucket, one node has a strange phenomenon:
1. The ops of the key not exists in bucket is very high, and it up to 1.1k/s, see also in attach1.jpg;
2. Only one node has the exception, other nodes is ok, see also in attach2.jpg;
3. The exception node's status see in attach3.jpg;
4. The exception node VBUCKET RESOURCES see in attach4.jpg;
5. When I set the exception key in the bucket by manual, the ops is also up to 1.1k/s, and then delete it from bucket, the ops also not down;
I had investigated the situation before the question posted that.
1. The application has no such reading or writing log about the key, while other keys can be found.
2. I logined to the exception node( and got the network connection of the port 11209~11213, there is no other application connect to the port except my application.
As what I said in the last comment, I failed over the node( , and the execption node changed to another node(, while the exception key also changed to another.

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