dajac commented on code in PR #12388:
URL: https://github.com/apache/kafka/pull/12388#discussion_r917780526


##########
clients/src/main/java/org/apache/kafka/common/utils/Utils.java:
##########
@@ -1432,4 +1432,17 @@ public static String[] enumOptions(Class<? extends 
Enum<?>> enumClass) {
                 .toArray(String[]::new);
     }
 
+    /**
+     * Ensures that the provided {@code reason} remains within a range of 255 
chars.
+     * @param reason This is the reason that is sent to the broker over the 
wire
+     *               as a part of {@code JoinGroupRequest}, {@code 
LeaveGroupRequest} or {@code RemoveMembersFromConsumerGroupOptions} messages.
+     * @return a provided reason as is or truncated reason if it exceeds the 
255 chars threshold.
+     */
+    public static String truncateIfRequired(final String reason) {

Review Comment:
   nit: As this is tight to the reason, I would rather put it in 
`JoinGroupRequest`. Should we call it `maybeTruncateReason`?



##########
clients/src/test/java/org/apache/kafka/clients/admin/KafkaAdminClientTest.java:
##########
@@ -4084,6 +4084,13 @@ public void testRemoveMembersFromGroupReason() throws 
Exception {
         testRemoveMembersFromGroup("testing remove members reason", "testing 
remove members reason");
     }
 
+    @Test
+    public void testRemoveMembersFromGroupReasonAndTruncateReason() throws 
Exception {

Review Comment:
   nit: `testRemoveMembersFromGroupTruncatesReason`?



##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/AbstractCoordinator.java:
##########
@@ -478,11 +478,12 @@ boolean joinGroupIfNeeded(final Timer timer) {
 
                 resetJoinGroupFuture();
                 synchronized (AbstractCoordinator.this) {
+                    final String simpleName = 
exception.getClass().getSimpleName();
                     final String shortReason = String.format("rebalance failed 
due to %s",
-                        exception.getClass().getSimpleName());
+                            simpleName);

Review Comment:
   nit: Could we put this one on the previous line?



##########
clients/src/test/java/org/apache/kafka/clients/consumer/internals/AbstractCoordinatorTest.java:
##########
@@ -1193,6 +1215,12 @@ public void testHandleLeaveGroupResponseWithException() {
     }
 
     private RequestFuture<Void> setupLeaveGroup(LeaveGroupResponse 
leaveGroupResponse) {
+        return setupLeaveGroup(leaveGroupResponse, "test maybe leave group", 
"test maybe leave group");
+    }
+
+    private RequestFuture<Void> setupLeaveGroup(LeaveGroupResponse 
leaveGroupResponse,
+                                                String expectedLeaveReason,
+                                                String actualLeaveReason) {

Review Comment:
   nit: I would put `actualLeaveReason` first. It is a bit more natural. Should 
we call it `leaveReason`? 



##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/AbstractCoordinator.java:
##########
@@ -478,11 +478,12 @@ boolean joinGroupIfNeeded(final Timer timer) {
 
                 resetJoinGroupFuture();
                 synchronized (AbstractCoordinator.this) {
+                    final String simpleName = 
exception.getClass().getSimpleName();
                     final String shortReason = String.format("rebalance failed 
due to %s",
-                        exception.getClass().getSimpleName());
+                            simpleName);
                     final String fullReason = String.format("rebalance failed 
due to '%s' (%s)",
-                        exception.getMessage(),
-                        exception.getClass().getSimpleName());
+                            exception.getMessage(),
+                            simpleName);

Review Comment:
   nit: Could we revert to the previous indentation?



##########
clients/src/test/java/org/apache/kafka/clients/consumer/internals/AbstractCoordinatorTest.java:
##########
@@ -1204,11 +1232,11 @@ private RequestFuture<Void> 
setupLeaveGroup(LeaveGroupResponse leaveGroupRespons
             }
             LeaveGroupRequestData leaveGroupRequest = ((LeaveGroupRequest) 
body).data();
             return 
leaveGroupRequest.members().get(0).memberId().equals(memberId) &&
-                   leaveGroupRequest.members().get(0).reason().equals("test 
maybe leave group");
+                    
leaveGroupRequest.members().get(0).reason().equals(expectedLeaveReason);

Review Comment:
   nit: Could we remove that extra added space?



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