vamossagar12 commented on a change in pull request #9508:
URL: https://github.com/apache/kafka/pull/9508#discussion_r570153122



##########
File path: 
streams/src/main/java/org/apache/kafka/streams/state/internals/InMemoryKeyValueStore.java
##########
@@ -103,6 +105,20 @@ public void putAll(final List<KeyValue<Bytes, byte[]>> 
entries) {
         }
     }
 
+    @Override
+    public <PS extends Serializer<P>, P> KeyValueIterator<Bytes, byte[]> 
prefixScan(final P prefix, final PS prefixKeySerializer) {

Review comment:
       Here is the new ticket: 
https://issues.apache.org/jira/browse/KAFKA-12289 and the PR for the ticket:
   https://github.com/apache/kafka/pull/10052

##########
File path: 
streams/src/main/java/org/apache/kafka/streams/state/internals/CachingKeyValueStore.java
##########
@@ -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:
       Actually, I had created another ticket to streamline tests for 
CachingKVStore: https://issues.apache.org/jira/browse/KAFKA-10788. @rohitrmd  
had volunteered to take this up.




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