nkurihar commented on issue #1352: Delete inactive subscriptions automatically
URL: https://github.com/apache/incubator-pulsar/pull/1352#issuecomment-372565125
 
 
   @merlimat 
   > I know it's not exactly the same but the effect is very similar to TTL on 
messages.
   
   The aim is the same: to keep the backlog size as low as possible.
   However I think auto-unsub achieves less storage usage than TTL since the 
inactive subscriptions are removed and there are no messages to retain, while 
"living"(not expired) messages always remain by TTL.

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