diff --git a/s3stream/src/main/java/com/automq/stream/s3/CompositeObjectReader.java b/s3stream/src/main/java/com/automq/stream/s3/CompositeObjectReader.java
index c77a6a7c9d..4a0d5b43d9 100644
--- a/s3stream/src/main/java/com/automq/stream/s3/CompositeObjectReader.java
+++ b/s3stream/src/main/java/com/automq/stream/s3/CompositeObjectReader.java
@@ -119,17 +119,14 @@ public synchronized void close0() {
 
     @Override
     public boolean equals(Object o) {
-        if (this == o)
-            return true;
-        if (o == null || getClass() != o.getClass())
-            return false;
-        CompositeObjectReader reader = (CompositeObjectReader) o;
-        return Objects.equals(objectMetadata.objectId(), reader.objectMetadata.objectId());
+        // NOTE: DO NOT OVERRIDE THIS
+        return super.equals(o);
     }
 
     @Override
     public int hashCode() {
-        return Objects.hashCode(objectMetadata.objectId());
+        // NOTE: DO NOT OVERRIDE THIS
+        return super.hashCode();
     }
 
     private void asyncGetBasicObjectInfo(CompletableFuture<BasicObjectInfo> basicObjectInfoCf) {
diff --git a/s3stream/src/main/java/com/automq/stream/s3/ObjectReader.java b/s3stream/src/main/java/com/automq/stream/s3/ObjectReader.java
index 231a015cf2..3cb30d3c70 100644
--- a/s3stream/src/main/java/com/automq/stream/s3/ObjectReader.java
+++ b/s3stream/src/main/java/com/automq/stream/s3/ObjectReader.java
@@ -213,17 +213,14 @@ public synchronized void close0() {
 
         @Override
         public boolean equals(Object o) {
-            if (this == o)
-                return true;
-            if (o == null || getClass() != o.getClass())
-                return false;
-            DefaultObjectReader reader = (DefaultObjectReader) o;
-            return Objects.equals(metadata.objectId(), reader.metadata.objectId());
+            // NOTE: DO NOT OVERRIDE THIS
+            return super.equals(o);
         }
 
         @Override
         public int hashCode() {
-            return Objects.hash(metadata.objectId());
+            // NOTE: DO NOT OVERRIDE THIS
+            return super.hashCode();
         }
 
     }
diff --git a/s3stream/src/main/java/com/automq/stream/s3/cache/AsyncLRUCache.java b/s3stream/src/main/java/com/automq/stream/s3/cache/AsyncLRUCache.java
index 0201d0f0d9..baa52b2194 100644
--- a/s3stream/src/main/java/com/automq/stream/s3/cache/AsyncLRUCache.java
+++ b/s3stream/src/main/java/com/automq/stream/s3/cache/AsyncLRUCache.java
@@ -22,6 +22,12 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+/**
+ * An asynchronous LRU cache that supports asynchronous value computation.
+ *
+ * @param <K> key type
+ * @param <V> value type, NOTE: V must not override equals and hashCode
+ */
 public class AsyncLRUCache<K, V extends AsyncMeasurable> {
     private static final Logger LOGGER = LoggerFactory.getLogger(AsyncLRUCache.class);
     private final AsyncLRUCacheStats stats = AsyncLRUCacheStats.getInstance();