amaliujia commented on a change in pull request #234:
URL: https://github.com/apache/incubator-ratis/pull/234#discussion_r513946132



##########
File path: 
ratis-common/src/main/java/org/apache/ratis/datastream/SupportedDataStreamType.java
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@@ -21,6 +21,7 @@
 import org.apache.ratis.util.ReflectionUtils;
 
 public enum SupportedDataStreamType implements DataStreamFactory {
+  DISABLED("org.apache.ratis.server.impl.DisabledDataStreamFactory"),
   NETTY("org.apache.ratis.netty.NettyDataStreamFactory");

Review comment:
       Because of dependencies. 
   
   `NettyDataStreamFactory` is in `ratis-netty`. A user who don't need stream 
server, thus choose to disable steam server, should not depend on 
`ratis-netty`. 
   
   Similarly, if in the future there is a `GrpcDataStreamFactory`, it likely 
will be in `ratis-grpc`.




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