// 3. create a new bucket
for (int i = 0; i < Short.MAX_VALUE; i++) {
    if (bucketFilter.test(i) && !totalBucket.contains(i)) {
        hash2Bucket.put(hash, (short) i);
        nonFullBucketInformation.put(i, 1L);
        totalBucket.add(i);
        return i;
    }
}

// 4. too many buckets, throw exception
@SuppressWarnings("OptionalGetWithoutIsPresent")
int maxBucket = totalBucket.stream().mapToInt(Integer::intValue).max().getAsInt();
throw new RuntimeException(
        String.format(
                "Too more bucket %s, you should increase target bucket row number %s.",
                maxBucket, targetBucketRowNumber));

// 3. create a new bucket
for (int i = 0; i < max_buckets; i++) {
    if (bucketFilter.test(i) && !totalBucket.contains(i)) {
        hash2Bucket.put(hash, (short) i);
        nonFullBucketInformation.put(i, 1L);
        totalBucket.add(i);
        return i;
    }
}

// 4. exceed max_buckets, just pick a bucket for record.
pick a min bucket (belongs to this task) to the record.