GitHub user lhotari added a comment to the discussion: How to set Aggregation 
replication?

Summarizing the answer from Slack:

There is no special "aggregration replication mode". The documentation is not 
very clear and doesn't provide an example of such configuration.

The "aggregation replication" pattern referred in the docs is about configuring 
the replication in a hub-spoke way where instead of having point-to-point 
connections (full mesh) between each cluster, you have a hub cluster and you 
connect all other clusters to this hub.

I have been using geo-replication without a shared metadata store. At least in 
that case, replication is configured point-to-point for each one-way direction.
Yes, there are some gotchas with partitioned topics. I think one solution is to 
disable topic auto creation. I believe that the replicator will attempt to 
create the topic in the remote cluster when replication starts the first time. 
In addition, setting up authorization and TLS isn't very straightforward.

Side note:
For subscription replication with multiple clusters, it is usually necessary to 
increase the `replicatedSubscriptionsSnapshotTimeoutSeconds` configuration 
setting for example to value `60` 
([comment](https://github.com/apache/pulsar/discussions/21612#discussioncomment-7649210)).

Other geo-replication discussions:
https://github.com/apache/pulsar/discussions/22315
https://github.com/apache/pulsar/discussions/21612



GitHub link: 
https://github.com/apache/pulsar/discussions/22336#discussioncomment-8899384

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