Hi Pulsar community: I opened a PIP to discuss "Notifications for partitions update"
### Motivation Pulsar client will poll brokers at fix time for checking the partitions update if we publish/subscribe the partitioned topics with `autoUpdatePartitions` as true. This causes unnecessary load for both clients and brokers since most of the time the number of partitions will not change. In addition polling introduces latency in partitions update which is specified by `autoUpdatePartitionsInterval`. This PIP would like to introduce a notification mechanism for partition update, which is much like PIP-145 for regex subscriptions https://github.com/apache/pulsar/issues/14505. For more details, please read the PIP at: https://github.com/apache/pulsar/issues/19596 Looking forward to hearing your thoughts. Thanks, Xiaoyu Hou ----
