[GitHub] [kafka] junrao commented on a diff in pull request #13304: KAFKA-14726 Move/rewrite of LogReadInfo, LogOffsetSnapshot, LogStartOffsetIncrementReason to storage module

["junrao (via GitHub)" <gi...@apache.org>]

junrao commented on code in PR #13304:
URL: https://github.com/apache/kafka/pull/13304#discussion_r1119112476


##########
core/src/main/scala/kafka/cluster/Partition.scala:
##########
@@ -1434,13 +1434,13 @@ class Partition(val topicPartition: TopicPartition,
       minOneMessage
     )
 
-    LogReadInfo(
-      fetchedData = fetchedData,
-      divergingEpoch = None,
-      highWatermark = initialHighWatermark,
-      logStartOffset = initialLogStartOffset,
-      logEndOffset = initialLogEndOffset,
-      lastStableOffset = initialLastStableOffset
+    new LogReadInfo(
+      fetchedData,
+      Optional.empty[FetchResponseData.EpochEndOffset](),

Review Comment:
   Could we just do `Optional.empty()`?



##########
storage/src/main/java/org/apache/kafka/storage/internals/log/LogReadInfo.java:
##########
@@ -0,0 +1,60 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.kafka.storage.internals.log;
+
+import org.apache.kafka.common.message.FetchResponseData;
+
+import java.util.Optional;
+
+/**
+ * Structure used for lower level reads using {@link kafka.cluster.Partition#fetchRecords()}.
+ */
+public class LogReadInfo {

Review Comment:
   All scala case classes define `equal()` and `hashcode()`. Do we need to define those explicitly in java?



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