in spark-job/src/main/java/org/apache/cassandra/diff/Differ.java [294:301]
static void validateRange(BigInteger start, BigInteger end, TokenHelper tokens) {
Verify.verify(start != null && end != null, "Invalid token range [%s,%s]", start, end);
Verify.verify(start.compareTo(tokens.min()) >= 0 && end.compareTo(tokens.max()) <= 0 && start.compareTo(end) < 0,
"Invalid token range [%s,%s] for partitioner range [%s,%s]",
start, end, tokens.min(), tokens.max());
}