Topic Level Replication

[Apurva007]

Apache Pulsar documentation states that geo-replication can be enabled at namespace or topic level. I am currently testing topic level replication without the whole namespace being replicated.

Setup:
I have 2 test clusters A and B sharing a global ZK. On Cluster A, I created a new namespace "geo" in tenant "public". In the "geo" namespace I created a new persistent partitioned topic "geo-topic". And then I used the following command to setup topic-level replication by running it on cluster A:

bin/pulsar-admin topics set-replication-clusters --clusters A,B public/geo/geo-topic

The command ran successfully, but I don't see any replication occurring. The topic and namespace is also missing on the cluster B.

Please can someone clarify if I am missing anything or misunderstood the documentation?

[gauravAshok]

Please share the pulsar version and the output of tenants get default & clusters list.

[Apurva007]

Yes. I ran the same command that you have specified. While typing the question I was using example cluster names.

[gauravAshok]

ok. :)
Then the only thing I can think of is the pulsar broker configuration

important ones are:
systemTopicEnabled=true
topicLevelPoliciesEnabled=true

Other than the above you should look into the broker logs to get more information. Check the logs when you run "set-replication-clusters" command.

[Apurva007]

So in 2.11.0 these configs are enabled by default. So didnt see any issues there.
Quick question. To set topic level replication, is the parent namespace replication required to be enabled as well?

[gauravAshok]

I dont think so. setting this on namespace will probably enable replication for all topics under it.

[Apurva007]

Right. I thought the same. But interestingly, the guide in the pulsar docs are not matching the actual results. So was wondering if anyone else had tried this out.