mjsax commented on a change in pull request #10877:
URL: https://github.com/apache/kafka/pull/10877#discussion_r651526827



##########
File path: 
streams/src/main/java/org/apache/kafka/streams/state/internals/MemoryNavigableLRUCache.java
##########
@@ -66,6 +68,22 @@ public MemoryNavigableLRUCache(final String name, final int 
maxCacheSize) {
                 .subMap(from, true, to, true).descendingKeySet().iterator(), 
treeMap));
     }
 
+    @Override
+    public <PS extends Serializer<P>, P> KeyValueIterator<Bytes, byte[]> 
prefixScan(final P prefix, final PS prefixKeySerializer) {
+
+        Objects.requireNonNull(prefix);

Review comment:
       as above (similar elsewhere)




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