ConcurrencyPractitioner edited a comment on issue #4152: Allow PersistentTopics#updatePartitionedTopic to also delete partitions URL: https://github.com/apache/pulsar/issues/4152#issuecomment-487810087 @sijie Oh, in that case, wouldn't we have to stop the flow of new records/messages into the ledgers? From the approach you described, what we should do is basically stop all flow of new data from Producer to the partitions we wish to delete, finish processing the data that is still there, then delete them. The most straightforward approach to deleting the partitions is as follows: if there was originally N partitions, and the user specifies us for K partitions, where K < N, we just delete the last N-K partitions (i.e. the ones with the biggest indexes). The partitions which are to be deleted I think would be made read-only once the user requests them to be deleted.
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