bbejeck commented on code in PR #23144:
URL: https://github.com/apache/kafka/pull/23144#discussion_r3771759934


##########
streams/src/main/java/org/apache/kafka/streams/state/internals/RocksDBStore.java:
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@@ -1074,6 +1081,18 @@ interface DBAccessor {
         void reset();
         void close();
 
+        /**
+         * Applies a batch of writes through {@code cfAccessor}, which owns 
the column-family layout.
+         * The default applies the entries one at a time; accessors that can 
write them as a single
+         * batch — or that must stage them instead of writing them — override 
this.
+         */
+        default void putAll(final ColumnFamilyAccessor cfAccessor,

Review Comment:
   It's inherited by the two test DBAccessors `InMemoryRocksDBAccessor`, and 
`ThrowingOnOffsetsPutDBAccessor`  but I can declare then as `abstract` implment 
them in the test methods - fair enough to do in a follow-up PR?



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