ableegoldman commented on a change in pull request #10000:
URL: https://github.com/apache/kafka/pull/10000#discussion_r570535029



##########
File path: 
streams/src/main/java/org/apache/kafka/streams/processor/internals/StreamTask.java
##########
@@ -227,6 +230,27 @@ public void initializeIfNeeded() {
         }
     }
 
+    private void initOffsetsIfNeeded(final 
java.util.function.Consumer<Set<TopicPartition>> offsetResetter) {
+        final Map<TopicPartition, OffsetAndMetadata> committed = 
mainConsumer.committed(resetOffsetsForPartitions);
+        for (final Map.Entry<TopicPartition, OffsetAndMetadata> committedEntry 
: committed.entrySet()) {
+            final OffsetAndMetadata offsetAndMetadata = 
committedEntry.getValue();
+            if (offsetAndMetadata != null) {
+                mainConsumer.seek(committedEntry.getKey(), offsetAndMetadata);
+                resetOffsetsForPartitions.remove(committedEntry.getKey());
+            }
+        }
+
+        if (!resetOffsetsForPartitions.isEmpty()) {

Review comment:
       Can we just pass in a no-op lambda instead? I'd rather avoid special 
handling for null input that isn't supposed to be null, just so we can use null 
in the tests (which are therefore not realistic tests since it should never be 
null, no?)




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