satishd commented on code in PR #13046:
URL: https://github.com/apache/kafka/pull/13046#discussion_r1059039639
##########
core/src/main/scala/kafka/log/UnifiedLog.scala:
##########
@@ -995,11 +994,12 @@ class UnifiedLog(@volatile var logStartOffset: Long,
}
}
- def latestEpoch: Option[Int] = leaderEpochCache.flatMap(_.latestEpoch)
+ def latestEpoch: Option[Int] =
leaderEpochCache.flatMap(_.latestEpoch.asScala).map(Int.unbox(_))
Review Comment:
Avoided using Java Optional classes here as all its usages are in Scala
classes for now. I prefer making this kind of change as part of moving
UnifiedLog to storage module. wdyt?
##########
storage/src/main/java/org/apache/kafka/server/log/internals/LeaderEpochCheckpoint.java:
##########
@@ -0,0 +1,26 @@
+/*
+ * 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.server.log.internals;
+
+import java.util.List;
+
+public interface LeaderEpochCheckpoint {
Review Comment:
+1 on that. I prefer have the package name with `server` but I am fine to
omit that to be consistent with the existing convention with other modules.
I will address it in the next commit of this PR. Let me know if you are fine
with the package name as `org.apache.kafka.storage.internals.checkpoint`.
##########
core/src/test/scala/unit/kafka/cluster/PartitionTest.scala:
##########
@@ -2650,7 +2647,7 @@ class PartitionTest extends AbstractPartitionTest {
assertEquals(Some(0L), partition.leaderEpochStartOffsetOpt)
val leaderLog = partition.localLogOrException
- assertEquals(Some(EpochEntry(leaderEpoch, 0L)),
leaderLog.leaderEpochCache.flatMap(_.latestEntry))
+ assertEquals(Some(new EpochEntry(leaderEpoch, 0L)),
leaderLog.leaderEpochCache.flatMap(_.latestEntry.asScala))
Review Comment:
`flatMap` has to return `Option`, that is why I converted from `Optional` to
`Option`. Another way can be to use match case statements that makes it
verbose. I left with Scala Option conversions for now as these will be
converted to Java later.
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