wu-sheng commented on issue #5142:
URL: https://github.com/apache/skywalking/issues/5142#issuecomment-661839274
I think this is fully described in the comments.
```
/**
* OAP server could work in different roles.
*/
public enum Role {
/**
* Default role. OAP works as the {@link #Receiver} and {@link
#Aggregator}
*/
Mixed,
/**
* Receiver mode OAP open the service to the agents, analysis and
aggregate the results and forward the results
* to {@link #Mixed} and {@link #Aggregator} roles OAP. The only
exception is for {@link
* org.apache.skywalking.oap.server.core.analysis.record.Record},
they don't require 2nd round distributed
* aggregation, is being pushed into the storage from the receiver
OAP directly.
*/
Receiver,
/**
* Aggregator mode OAP receives data from {@link #Mixed} and {@link
#Aggregator} OAP nodes, and do 2nd round
* aggregation. Then save the final result to the storage.
*/
Aggregator
}
```
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