@Override
  public Integer offsetComparator(String offset1, String offset2) {
    return null;
  }
Checkpoints are written to KCL and is always the source of truth. Format for Samza offsets is different from
that of Kinesis checkpoint. Samza offsets are not comparable. Hence, return null.
samza-aws/src/main/java/org/apache/samza/system/kinesis/KinesisSystemAdmin.java