mouchar commented on issue #10972:
URL: https://github.com/apache/pulsar/issues/10972#issuecomment-1184251475

   It also happened to us after upgrading from pulsar 2.7.x to 2.9.2.
   The problem is that existing namespaces have 
subscriptionExpirationTimeMinutes set to `0` instead of `null`.
   
   The fix is to remove the setting by `pulsar-admin namespaces 
remove-subscription-expiration-time tenant/namespace`.
   Then, all stale subscriptions without consumers were automatically deleted 
without any user intervention.
   
   Newly created namespaces have this value set to null, so only existing 
namespaces are affected.
   


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