[redis-db] redis key space notifacation in cluster model

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In my system , we use redis key space notification to listen key expire
event.When my server get the key expire event, I will do something with the
key.It is normal in a single machine.
Unfortunately, the production environment is cluster deployment and the
service is stateless.So when a key expireall the server will receive the
same notificationand then the same business method will be executed
several times.
Is there any good way to guarantee one key expire only send one
notification to one of the clusters.
I use java languagecan you give me some example ? Thanks a lot....