private boolean isEmpty(int position) {
        return bytes.getLong(position) == 0
            && bytes.getLong(position + 8) == 0
            && bytes.getLong(position + 16) == 0;
    }
Check that there is no entry at the given position
storage/src/main/java/org/apache/kafka/storage/internals/log/SkimpyOffsetMap.java