cadonna commented on pull request #10548:
URL: https://github.com/apache/kafka/pull/10548#issuecomment-824665014
>
> * prefixScan() (prefix should not be `null` either I guess? \cc
@guozhangwang @cadonna
>
Yes! Actually, the implementations in `RocksDBStore` and
`InMemoryKeyValueStore` already have a `null` check.
```
public <PS extends Serializer<P>, P> KeyValueIterator<Bytes, byte[]>
prefixScan(final P prefix,
final PS prefixKeySerializer) {
Objects.requireNonNull(prefix, "prefix cannot be null");
Objects.requireNonNull(prefixKeySerializer, "prefixKeySerializer
cannot be null");
```
I think it would make sense to move them to the `MeteredKeyValueStore`.
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