merlimat commented on a change in pull request #1352: Delete inactive 
subscriptions automatically
URL: https://github.com/apache/incubator-pulsar/pull/1352#discussion_r179320757
 
 

 ##########
 File path: 
pulsar-broker/src/main/java/org/apache/pulsar/broker/service/persistent/PersistentTopic.java
 ##########
 @@ -1410,6 +1412,29 @@ public void checkGC(int gcIntervalInSeconds) {
         }
     }
 
+    @Override
+    public void checkInactiveSubscriptions() {
+        long expirationTime = 
brokerService.pulsar().getConfiguration().getSubscriptionExpirationTimeMinutes()
 * 1000 * 60;
+        if (expirationTime <= 0) return;
+
+        subscriptions.forEach((subName, sub) -> {
+            if (sub.getNumberOfEntriesInBacklog() == 0) return;
+            sub.peekNthMessage(1).thenAccept(entry -> {
+                ByteBuf messageMetadataAndPayload = entry.getDataBuffer();
+                PulsarApi.MessageMetadata md = 
Commands.parseMessageMetadata(messageMetadataAndPayload);
+                if (System.currentTimeMillis() - md.getPublishTime() > 
expirationTime) {
+                    sub.delete().thenAccept(v ->
+                        log.info("[{}][{}] The subscription was deleted due to 
expiration", topic, subName));
+                }
+                messageMetadataAndPayload.clear();
 
 Review comment:
   the buffer needs to be released instead of cleared to go back into pool: 
   
   ```java
   messageMetadataAndPayload.clear();
   ```

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