merlimat commented on a change in pull request #1352: Delete inactive 
subscriptions automatically

 File path: 
 @@ -89,6 +89,11 @@
     private int messageExpiryCheckIntervalInMinutes = 5;
     // How long to delay rewinding cursor and dispatching messages when active 
consumer is changed
     private int activeConsumerFailoverDelayTimeMillis = 1000;
+    // How long to delete inactive subscriptions from last consuming
+    // When it is 0, inactive subscriptions are not deleted automatically
+    private long subscriptionExpirationTimeMinutes = 0;
+    // How frequently to proactively check and purge expired subscription
+    private long subscriptionExpiryCheckIntervalInMinutes = 5;
 Review comment:
   In any case, still won't help if the broker gets restarted. 
   Since the "inactivity" information is not persisted, the new broker will 
have to restart the counting from 0. 
   For example, if `subscriptionExpiration` is 1 week, we might check every 
5minutes but we cannot drop it for a week after the cosnumer disconnected. 
   If the broker gets restarted after 6 days, the new broker will start the 
countdown again and the subscription will be stay there for ~2 weeks, or more, 
since there's no hard guarantee that this will ever happen.

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