VinceMu commented on a change in pull request #8666:
URL: https://github.com/apache/kafka/pull/8666#discussion_r435212607



##########
File path: core/src/main/scala/kafka/admin/ConsumerGroupCommand.scala
##########
@@ -291,14 +291,21 @@ object ConsumerGroupCommand extends Logging {
     }
 
     private def printStates(states: Map[String, GroupState]): Unit = {
-      for ((groupId, state) <- states) {
-        if (shouldPrintMemberState(groupId, Some(state.state), Some(1))) {
+      val stateProps =  
states.filter{case(groupId,state)=>shouldPrintMemberState(groupId, 
Some(state.state), Some(1))}
+        .map{case (_,state)=>
           val coordinator = 
s"${state.coordinator.host}:${state.coordinator.port} 
(${state.coordinator.idString})"
-          val coordinatorColLen = Math.max(25, coordinator.length)
-          print(s"\n%${-coordinatorColLen}s %-25s %-20s %-15s 
%s".format("GROUP", "COORDINATOR (ID)", "ASSIGNMENT-STRATEGY", "STATE", 
"#MEMBERS"))
-          print(s"\n%${-coordinatorColLen}s %-25s %-20s %-15s 
%s".format(state.group, coordinator, state.assignmentStrategy, state.state, 
state.numMembers))
-          println()
+          
(state.group,coordinator,state.assignmentStrategy,state.state,state.numMembers)
         }
+      val hasAllGroups = opts.options.has(opts.allGroupsOpt)
+      if(stateProps.nonEmpty && hasAllGroups){

Review comment:
       KAFKA-9479 entails only printing the header once when the `all-groups` 
flag is present. 




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