maybe there is an error in RegisterSet.java

[improvejin]

the line 52 of RegisterSet.java is else if (bits % Integer.SIZE == 0). in function getSizeForCount.

public static int getSizeForCount(int count) {
    int bits = getBits(count);
    if (bits == 0) {
        return 1;
    } else if (bits % Integer.SIZE == 0) {
        return bits;
    } else {
        return bits + 1;
    }
}

the parameter count is the bucket num, RegisterSet.REGISTER_SIZE is the number of bucket per Int, this value is 5. the code "int bits = getBits(count)" return the lenth of int array for bucket, I think the judgement of line 52 should be if(count%REGISTER_SIZE ==0), if the mode is zero, the value of bits is the length of int array for bucket.

[improvejin]

https://github.com/addthis/stream-lib/blob/master/src/main/java/com/clearspring/analytics/stream/cardinality/RegisterSet.java