Hi all, I would like to start a VOTE on `PIP-245: Make subscriptions of non-persistent topic non-durable`.
Motivation: There are two types of subscriptions for a topic: Durable and Non-durable. We create a Consumer with a Durable subscription and a Reader with a Non-durable subscription. But for NonPersistentTopic, creating a Durable subscription is meaningless, NonPersistentSubscription doesn't have a ManagedCursor to persistent its data. After its consumer disconnected, the subscription couldn't be removed automatically if we didn't set the value of subscriptionExpirationTimeMinutes greater than 0. For subscriptionExpirationTimeMinutes, it controls the subscription expiration of NonPersistentTopic and PersistentTopic, if we set the value of subscriptionExpirationTimeMinutes greater than 0, it may lead to data loss(The durable subscriptions of PersistentTopic also can be removed). And the Non-durable subscriptions will be removed automatically after all the consumers disconnected, it's the existing logic. For the purpose of removing the subscriptions which have no active consumers of NonPersistentTopic and the above reasons, we can make all the subscriptions of a NonPersistentTopic Non-durable. For more details, you can read: https://github.com/apache/pulsar/issues/19448 <https://github.com/apache/pulsar/issues/19448> And the discuss thread is available at: https://lists.apache.org/thread/2ltmyglnb25jy8nk58twkwbglws43bst <https://lists.apache.org/thread/2ltmyglnb25jy8nk58twkwbglws43bst> Thanks, Tao Jiuming
