darcydai commented on pull request #6781:
URL: https://github.com/apache/skywalking/pull/6781#issuecomment-822507907
> @darcydai Could you give an explanation of the relationship between this
and `mm2`
Yes. basically, there two have no relationship. reference #5949, mm2 is
MirrorMake 2, a cross-cluster sync data tool. the topic name of another
cluster will add a prefix of origin topic. mm2 works with OAP server aims to
add prefix then consumer another Kafka cluster data(sync from another Kafka
cluster). namespace aims to isolate the OAP cluster when using the same Kafka
cluster, like the namespace in Elasticsearch. although there two do the same
work, add a prefix of the topic.
if have no namespace we need to config too many items for the topic name.
example:
```properties
plugin.kafka.namespace=op-test
````
is the same like blow
```properties
plugin.kafka.topic_metrics=op-test-skywalking-metrics
plugin.kafka.topic_profiling=op-test-skywalking-profiling
plugin.kafka.topic_segment=op-test-skywalking-segment
plugin.kafka.topic_management=op-test-skywalking-management
plugin.kafka.topic_meter=op-test-skywalking-meter
```
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