[GitHub] [pulsar] feeblefakie commented on issue #6554: Dispatch messages to the new consumer after exist consumer acknowledged all dispatched messages in Key_Shared Subscription.

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feeblefakie commented on issue #6554: Dispatch messages to the new consumer after exist consumer acknowledged all dispatched messages in Key_Shared Subscription.
URL: https://github.com/apache/pulsar/issues/6554#issuecomment-606408672
 
 
   Let me add a related issue and some discussion I and @codelipenghui had about this.
   
   - [Key_Shared consumers with different subscriptions get messages for the same key in an inconsistent order](http://mail-archives.apache.org/mod_mbox/pulsar-users/202003.mbox/%3CCAPDOW74LN3WtdhpG_cgCCSg9MuMmkNV6giCGD5p%3DW1wWji0W7w%40mail.gmail.com%3E)
   - https://apache-pulsar.slack.com/archives/C5Z4T36F7/p1585527971073400
   
   I think sticky consumers won't really solve it since consumers can be easily down in failure cases and it is pretty hard for applications to manage scalability of consumers.

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