chia7712 commented on code in PR #15710:
URL: https://github.com/apache/kafka/pull/15710#discussion_r1562828732


##########
server-common/src/test/java/org/apache/kafka/timeline/SnapshotRegistryTest.java:
##########
@@ -41,9 +42,7 @@ public void testEmptyRegistry() {
     private static void assertIteratorContains(Iterator<Snapshot> iter,
                                                Snapshot... snapshots) {
         List<Snapshot> expected = new ArrayList<>();

Review Comment:
   How about `List<Snapshot> expected = Arrays.asList(snapshots);`?



##########
server/src/main/java/org/apache/kafka/server/metrics/ClientMetricsInstance.java:
##########
@@ -116,8 +116,7 @@ public synchronized boolean 
maybeUpdatePushRequestTimestamp(long currentTime) {
         */
         boolean canAccept = lastGetRequestTimestamp > lastPushRequestTimestamp;

Review Comment:
   how about `boolean canAccept = lastGetRequestTimestamp > 
lastPushRequestTimestamp || currentTime - lastPushRequestTimestamp >= 
pushIntervalMs;`?



##########
server-common/src/test/java/org/apache/kafka/timeline/SnapshottableHashTableTest.java:
##########
@@ -310,10 +309,8 @@ private static void assertIteratorYields(Iterator<?> iter,
             }
         }
         if (!extraObjects.isEmpty() || !remaining.isEmpty()) {
-            throw new RuntimeException("Found extra object(s): [" + 
String.join(", ",
-                extraObjects.stream().map(e -> 
e.toString()).collect(Collectors.toList())) +
-                "] and didn't find object(s): [" + String.join(", ",
-                remaining.keySet().stream().map(e -> 
e.toString()).collect(Collectors.toList())) + "]");
+            throw new RuntimeException("Found extra object(s): [" + 
extraObjects.stream().map(e -> e.toString()).collect(Collectors.joining(", ")) +

Review Comment:
   `e -> e.toString()` -> `Object::toString`



##########
server/src/main/java/org/apache/kafka/server/AssignmentsManager.java:
##########
@@ -321,7 +321,7 @@ public void run() throws Exception {
                 AssignReplicasToDirsResponseData data = 
((AssignReplicasToDirsResponse) response.responseBody()).data();
 
                 Set<AssignmentEvent> failed = filterFailures(data, inflight);
-                Set<AssignmentEvent> completed = Utils.diff(HashSet::new, 
inflight.values().stream().collect(Collectors.toSet()), failed);
+                Set<AssignmentEvent> completed = Utils.diff(HashSet::new, new 
HashSet<>(inflight.values()), failed);

Review Comment:
   Maybe we don't need to create collection many times by skipping the failed 
elements.
   ```java
                   Set<AssignmentEvent> failed = filterFailures(data, inflight);
                   for (AssignmentEvent assignmentEvent : inflight.values()) {
                       if (failed.contains(assignmentEvent)) continue;
                       if (log.isDebugEnabled()) {
                           log.debug("Successfully propagated assignment {}", 
assignmentEvent);
                       }
                       assignmentEvent.onComplete();
                   }
   ```



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