vamossagar12 commented on a change in pull request #9508:
URL: https://github.com/apache/kafka/pull/9508#discussion_r566234034



##########
File path: 
streams/src/main/java/org/apache/kafka/streams/state/internals/CachingKeyValueStore.java
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@@ -291,6 +292,16 @@ public void putAll(final List<KeyValue<Bytes, byte[]>> 
entries) {
         return new MergedSortedCacheKeyValueBytesStoreIterator(cacheIterator, 
storeIterator, true);
     }
 
+    @Override
+    public <PS extends Serializer<P>, P> KeyValueIterator<Bytes, byte[]> 
prefixScan(final P prefix, final PS prefixKeySerializer) {

Review comment:
       Similar comment as below. Unit tests are in 
CachingInMemoryKeyValueStoreTest which already extends 
AbstractKeyValueStoreTest and creates an in memory cache store.




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