How about use as counter map ？ about hashmap HOT 9 CLOSED

#	0x66f037	mwcs/framework/datastructures/maps.(*HashMap).grow+0x67			/src/src/mwcs/framework/datastructures/maps/hashmap.go:266
#	0x66eba1	mwcs/framework/datastructures/maps.(*HashMap).insertListElement+0x131	/src/src/mwcs/framework/datastructures/maps/hashmap.go:190
#	0x66e5e1	mwcs/framework/datastructures/maps.(*HashMap).Insert+0xd1		/src/src/mwcs/framework/datastructures/maps/hashmap.go:121

----------------------------------------------------------+-------------
      flat  flat%   sum%        cum   cum%   calls calls% + context
----------------------------------------------------------+-------------
                                            99.87s   100% |   mwcs/framework/datastructures/maps.(*List).Add
    92.89s 91.32% 91.32%     99.87s 98.18%                | mwcs/framework/datastructures/maps.(*List).search
                                             6.98s   100% |   mwcs/framework/datastructures/maps.(*ListElement).Next
----------------------------------------------------------+-------------

flat  flat%   sum%        cum   cum%
    92.89s 91.32% 91.32%     99.87s 98.18%  mwcs/framework/datastructures/maps.(*List).search

        if flag&DEBUG_FLAG > 0 {
		hit = 1
		sampleRate = 1
	} else {
		url := stream.Stream().HttpPath()
		for {
			val, ok := l.sampling.GetStringKey(url)
			if !ok {
				c := uint32(1)
				if !l.sampling.Insert(url, unsafe.Pointer(&c)) {
					continue
				}
				hit = 1
				break
			}
			c := (*uint32)(val)
			new := atomic.AddUint32(c, 1)
			if new&(l.sampleRate-1) == 0 {
				hit = 1
			}
			break
		}
	}