smengcl commented on code in PR #11571:
URL: https://github.com/apache/ozone/pull/11571#discussion_r4301717138


##########
hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/ha/SCMRatisServer.java:
##########
@@ -53,6 +53,12 @@ SCMRatisResponse submitRequest(SCMRatisRequest request)
 
   RaftServer.Division getDivision();
 
+  /**
+   * Returns the maximum replication lag of SCM Ratis followers in Raft log 
entries.
+   * Returns 0 when this node is not the leader or non-HA (no throttling 
signal applies.)
+   */
+  long getFollowerReplicationLag();

Review Comment:
   This new abstract method breaks the existing server-scm test stub: 
TestReplicationAnnotation still creates an anonymous SCMRatisServer without 
getFollowerReplicationLag(). The test sources therefore fail to compile because 
the anonymous class does not implement this method. Please add the stub 
override (return 0) or make the API method default before merging.



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