offsets.go
func (s *OffsetStash) MarkPartitionOffset(topic string, partition int32, offset int64, metadata string) {
	s.mu.Lock()
	defer s.mu.Unlock()

	key := topicPartition{Topic: topic, Partition: partition}
	if info := s.offsets[key]; offset >= info.Offset {
		info.Offset = offset
		info.Metadata = metadata
		s.offsets[key] = info
	}
}
func (s *OffsetStash) MarkPartitionOffset(topic string, partition int32, offset int64, metadata string) {
	s.mu.Lock()
	defer s.mu.Unlock()

	key := topicPartition{Topic: topic, Partition: partition}
	if info := s.offsets[key]; offset >= info.Offset {
		info.Offset = offset
		info.Metadata = metadata
		s.offsets[key] = info
	}
}
// MarkPartitionOffset stashes the offset for the provided topic/partition combination