ketama memcached java client

[Hanson Char]

Hi,

I refer to the ketama SockIOPool
(http://static.last.fm/ketama/ketama-0.1.1.tar.bz2) implementation for
the use of consistent hashing in the memcached java client.  In the
initialize method, if the weight of each server is 1, the "factor"
would be 40 and therefore resulting in each server being added to the
TreeMap 160 times (with code extracted below.)

Curious, why 40 ?  Is it optimal ?  Why not configurable ?

Hanson Char

                        double factor =
Math.floor(((double)(40*this.servers.length*thisWeight))/(double)this.totalWeight);
                        
                        for(long j = 0; j < factor; j++) {
                                byte[] d = 
md5.digest((servers[i]+"-"+j).getBytes());
                                for(int h=0;h<4;h++) {
                                        Long k =
                                                  ((long)(d[3+h*4]&0xFF) << 24)
                                                | ((long)(d[2+h*4]&0xFF) << 16)
                                                | ((long)(d[1+h*4]&0xFF) << 8)
                                                | ((long)(d[0+h*4]&0xFF));
                                        buckets.put(k, servers[i]);
                                        log.debug( "++++ added " + servers[i] + 
" to server bucket" );
                                }                               
                        }