MapRedcue的演示（协同过滤）
做一个关于电影推荐。你于你好友之间的浏览电影以及电影评分的推荐的协同过滤。
百度百科：
协同过滤简单来说是利用某兴趣相投、拥有共同经验之群体的喜好来推荐用户感兴趣的信息，个人通过合作的机制给予信息相当程度的回应（如评分）并记录下来以达到过滤的目的进而帮助别人筛选信息，回应不一定局限于特别感兴趣的，特别不感兴趣信息的纪录也相当重要。
协同过滤又可分为评比（rating）或者群体过滤（social filtering）协同过滤以其出色的速度和健壮性，在全球互联网领域炙手可热。
元数据：
1 盗梦空间 4.0
1 碟中谍 1.5
1 禁闭岛 4.0
2 王的盛宴 2.5
2 盗梦空间 5.0
2 肖申克的救赎 3.0
2 禁闭岛 2.5
3 教父 3.5
3 盗梦空间 5.0
3 007 4.5
3 星球大战 5.0
3 华尔街之狼 2.5
3 禁闭岛 1.5
3 碟中谍 2.0
4 碟中谍 2.5
4 禁闭岛 1.5
4 007 2.0
5 沉默的羔羊 4.5
5 肖申克的救赎 5.0
5 碟中谍 3.0
6 沉默的羔羊 5.0
6 碟中谍 4.0
6 王的盛宴 4.0
7 王的盛宴 5.0
7 碟中谍 1.5
7 肖申克的救赎 3.5
7 华尔街之狼 2.5
8 禁闭岛 3.0
8 盗梦空间 4.0
8 教父 2.5
8 星球大战 3.5
8 肖申克的救赎 3.0
8 王的盛宴 3.0
8 华尔街之狼 2.0
9 沉默的羔羊 5.0
9 禁闭岛 4.0
9 教父 5.0
9 盗梦空间 4.5
9 星球大战 4.0
9 王的盛宴 1.5
9 华尔街之狼 3.0
10 盗梦空间 3.5
10 沉默的羔羊 5.0
10 禁闭岛 2.5
10 肖申克的救赎 2.0
10 王的盛宴 4.0
10 教父 2.0
10 碟中谍 1.5
11 禁闭岛 3.0
11 碟中谍 2.5
11 盗梦空间 3.0
11 肖申克的救赎 3.0
12 华尔街之狼 3.0
12 星球大战 3.5
12 碟中谍 1.5
13 教父 3.5
13 肖申克的救赎 2.5
13 华尔街之狼 5.0
13 星球大战 5.0
13 沉默的羔羊 1.5
13 盗梦空间 3.0
13 禁闭岛 3.0
14 007 4.0
14 星球大战 2.5
14 华尔街之狼 1.5
14 教父 4.5
14 盗梦空间 3.0
14 沉默的羔羊 3.5
15 沉默的羔羊 4.0
15 华尔街之狼 2.5
15 肖申克的救赎 5.0
16 肖申克的救赎 2.0
16 007 5.0
16 盗梦空间 3.5
17 星球大战 4.5
17 禁闭岛 1.5
17 007 4.5
18 007 4.5
18 华尔街之狼 5.0
18 沉默的羔羊 1.5
18 盗梦空间 2.0
19 星球大战 4.5
19 华尔街之狼 3.0
19 肖申克的救赎 5.0
19 007 2.0
19 王的盛宴 4.0
19 碟中谍 2.5
19 沉默的羔羊 3.0
20 007 2.0
20 教父 4.0
20 星球大战 2.5
20 盗梦空间 4.5
20 华尔街之狼 3.0
20 碟中谍 4.5
20 肖申克的救赎 3.0
20 禁闭岛 2.0
21 王的盛宴 2.0
21 碟中谍 2.5
21 禁闭岛 2.5
21 盗梦空间 1.5
21 肖申克的救赎 4.5
22 沉默的羔羊 2.0
22 教父 4.0
22 肖申克的救赎 3.5
22 王的盛宴 1.5
22 禁闭岛 1.5
23 盗梦空间 3.5
23 华尔街之狼 4.0
23 007 2.0
23 肖申克的救赎 4.5
24 007 4.0
24 华尔街之狼 5.0
24 教父 1.5
24 禁闭岛 1.5
25 王的盛宴 3.0
25 星球大战 2.0
25 沉默的羔羊 5.0
25 禁闭岛 2.0
26 007 2.0
26 肖申克的救赎 3.5
26 星球大战 4.5
26 教父 4.5
27 沉默的羔羊 5.0
27 禁闭岛 1.5
27 肖申克的救赎 5.0
28 007 5.0
28 星球大战 5.0
28 盗梦空间 3.0
28 王的盛宴 4.0
28 沉默的羔羊 2.0
28 教父 2.5
28 华尔街之狼 5.0
28 肖申克的救赎 4.0
29 肖申克的救赎 3.0
29 盗梦空间 3.0
29 星球大战 3.5
29 王的盛宴 5.0
29 碟中谍 3.5
29 禁闭岛 1.5
30 沉默的羔羊 4.5
30 星球大战 1.5
30 教父 1.5
31 盗梦空间 3.0
31 肖申克的救赎 4.0
31 王的盛宴 3.0
32 碟中谍 2.0
32 禁闭岛 2.5
32 盗梦空间 3.0
33 禁闭岛 5.0
33 教父 3.0
33 肖申克的救赎 4.5
33 华尔街之狼 4.5
33 盗梦空间 4.0
34 星球大战 2.0
34 沉默的羔羊 3.0
34 007 5.0
34 禁闭岛 2.0
35 华尔街之狼 4.5
35 007 1.5
35 盗梦空间 3.5
35 星球大战 1.5
35 教父 2.5
36 碟中谍 2.0
36 肖申克的救赎 4.0
36 教父 1.5
36 王的盛宴 5.0
37 肖申克的救赎 2.0
37 沉默的羔羊 4.0
37 王的盛宴 2.5
37 盗梦空间 5.0
37 教父 2.5
38 华尔街之狼 1.5
38 星球大战 4.0
38 王的盛宴 3.0
39 007 3.5
39 教父 2.0
39 盗梦空间 3.5
39 王的盛宴 3.5
40 华尔街之狼 3.0
40 沉默的羔羊 4.5
40 盗梦空间 5.0
40 007 2.5
40 碟中谍 3.5
40 星球大战 1.5
40 教父 3.0
40 王的盛宴 2.0
41 教父 2.5
41 禁闭岛 4.5
41 007 1.5
41 沉默的羔羊 1.5
41 肖申克的救赎 2.0
41 盗梦空间 3.0
41 星球大战 4.0
42 华尔街之狼 1.5
42 王的盛宴 1.5
42 教父 4.0
43 华尔街之狼 3.5
43 教父 5.0
43 碟中谍 4.5
44 沉默的羔羊 5.0
44 教父 4.5
44 肖申克的救赎 4.0
44 盗梦空间 2.5
44 碟中谍 4.5
44 星球大战 1.5
44 王的盛宴 5.0
45 华尔街之狼 3.0
45 王的盛宴 4.5
45 禁闭岛 2.0
46 王的盛宴 2.5
46 盗梦空间 4.0
46 星球大战 4.5
46 007 2.0
46 教父 1.5
47 教父 2.5
47 华尔街之狼 3.0
47 007 5.0
47 碟中谍 1.5
47 禁闭岛 4.0
48 星球大战 5.0
48 教父 4.5
48 盗梦空间 2.5
49 沉默的羔羊 4.0
49 肖申克的救赎 5.0
49 王的盛宴 2.5
49 星球大战 1.5
49 碟中谍 2.0
49 华尔街之狼 4.5
49 盗梦空间 4.5
50 盗梦空间 2.0
50 禁闭岛 1.5
50 沉默的羔羊 2.0思路：
step1：过滤得到每个用户看过的所有电影
输出：key:用户1 value:{ 1 盗梦空间:4.0,碟中谍:1.5,禁闭岛:4.0}
1 盗梦空间:4.0,碟中谍:1.5,禁闭岛:4.0
2 王的盛宴:2.5,盗梦空间:5.0,肖申克的救赎:3.0,禁闭岛:2.5
3 碟中谍:2.0,教父:3.5,盗梦空间:5.0,007:4.5,星球大战:5.0,华尔街之狼:2.5,禁闭岛:1.5
4 碟中谍:2.5,禁闭岛:1.5,007:2.0
5 沉默的羔羊:4.5,肖申克的救赎:5.0,碟中谍:3.0
6 沉默的羔羊:5.0,碟中谍:4.0,王的盛宴:4.0
7 王的盛宴:5.0,碟中谍:1.5,肖申克的救赎:3.5,华尔街之狼:2.5
8 禁闭岛:3.0,盗梦空间:4.0,教父:2.5,星球大战:3.5,肖申克的救赎:3.0,王的盛宴:3.0,华尔街之狼:2.0
9 禁闭岛:4.0,教父:5.0,盗梦空间:4.5,沉默的羔羊:5.0,星球大战:4.0,王的盛宴:1.5,华尔街之狼:3.0
10 肖申克的救赎:2.0,盗梦空间:3.5,沉默的羔羊:5.0,禁闭岛:2.5,王的盛宴:4.0,教父:2.0,碟中谍:1.5
11 禁闭岛:3.0,碟中谍:2.5,盗梦空间:3.0,肖申克的救赎:3.0
12 华尔街之狼:3.0,星球大战:3.5,碟中谍:1.5
13 华尔街之狼:5.0,教父:3.5,肖申克的救赎:2.5,星球大战:5.0,沉默的羔羊:1.5,盗梦空间:3.0,禁闭岛:3.0
14 星球大战:2.5,007:4.0,华尔街之狼:1.5,教父:4.5,盗梦空间:3.0,沉默的羔羊:3.5
15 沉默的羔羊:4.0,华尔街之狼:2.5,肖申克的救赎:5.0
16 肖申克的救赎:2.0,007:5.0,盗梦空间:3.5
17 禁闭岛:1.5,星球大战:4.5,007:4.5
18 007:4.5,华尔街之狼:5.0,沉默的羔羊:1.5,盗梦空间:2.0
19 星球大战:4.5,华尔街之狼:3.0,肖申克的救赎:5.0,007:2.0,王的盛宴:4.0,碟中谍:2.5,沉默的羔羊:3.0
20 007:2.0,教父:4.0,星球大战:2.5,盗梦空间:4.5,华尔街之狼:3.0,碟中谍:4.5,肖申克的救赎:3.0,禁闭岛:2.0
21 碟中谍:2.5,禁闭岛:2.5,盗梦空间:1.5,肖申克的救赎:4.5,王的盛宴:2.0
22 禁闭岛:1.5,沉默的羔羊:2.0,教父:4.0,肖申克的救赎:3.5,王的盛宴:1.5
23 盗梦空间:3.5,华尔街之狼:4.0,007:2.0,肖申克的救赎:4.5
24 007:4.0,华尔街之狼:5.0,教父:1.5,禁闭岛:1.5
25 星球大战:2.0,禁闭岛:2.0,沉默的羔羊:5.0,王的盛宴:3.0
26 肖申克的救赎:3.5,星球大战:4.5,教父:4.5,007:2.0
27 沉默的羔羊:5.0,禁闭岛:1.5,肖申克的救赎:5.0
28 华尔街之狼:5.0,007:5.0,星球大战:5.0,盗梦空间:3.0,王的盛宴:4.0,沉默的羔羊:2.0,教父:2.5,肖申克的救赎:4.0
29 肖申克的救赎:3.0,盗梦空间:3.0,星球大战:3.5,王的盛宴:5.0,碟中谍:3.5,禁闭岛:1.5
30 沉默的羔羊:4.5,星球大战:1.5,教父:1.5
31 盗梦空间:3.0,肖申克的救赎:4.0,王的盛宴:3.0
32 禁闭岛:2.5,碟中谍:2.0,盗梦空间:3.0
33 教父:3.0,肖申克的救赎:4.5,华尔街之狼:4.5,盗梦空间:4.0,禁闭岛:5.0
34 星球大战:2.0,沉默的羔羊:3.0,007:5.0,禁闭岛:2.0
35 教父:2.5,华尔街之狼:4.5,007:1.5,盗梦空间:3.5,星球大战:1.5
36 碟中谍:2.0,肖申克的救赎:4.0,教父:1.5,王的盛宴:5.0
37 肖申克的救赎:2.0,沉默的羔羊:4.0,王的盛宴:2.5,盗梦空间:5.0,教父:2.5
38 华尔街之狼:1.5,星球大战:4.0,王的盛宴:3.0
39 教父:2.0,007:3.5,盗梦空间:3.5,王的盛宴:3.5
40 盗梦空间:5.0,007:2.5,沉默的羔羊:4.5,碟中谍:3.5,星球大战:1.5,教父:3.0,华尔街之狼:3.0,王的盛宴:2.0
41 007:1.5,教父:2.5,禁闭岛:4.5,沉默的羔羊:1.5,肖申克的救赎:2.0,盗梦空间:3.0,星球大战:4.0
42 华尔街之狼:1.5,王的盛宴:1.5,教父:4.0
43 华尔街之狼:3.5,教父:5.0,碟中谍:4.5
44 王的盛宴:5.0,沉默的羔羊:5.0,教父:4.5,肖申克的救赎:4.0,盗梦空间:2.5,碟中谍:4.5,星球大战:1.5
45 华尔街之狼:3.0,禁闭岛:2.0,王的盛宴:4.5
46 007:2.0,王的盛宴:2.5,盗梦空间:4.0,星球大战:4.5,教父:1.5
47 教父:2.5,华尔街之狼:3.0,007:5.0,碟中谍:1.5,禁闭岛:4.0
48 星球大战:5.0,教父:4.5,盗梦空间:2.5
49 沉默的羔羊:4.0,肖申克的救赎:5.0,王的盛宴:2.5,星球大战:1.5,碟中谍:2.0,华尔街之狼:4.5,盗梦空间:4.5
50 盗梦空间:2.0,禁闭岛:1.5,沉默的羔羊:2.0
step2: 根据 step-out 通过所有用户看过的电影矩阵
输出：007:007 19(电影出现的次数)
007:007 19
007:华尔街之狼 11
007:教父 12
007:星球大战 12
007:沉默的羔羊 7
007:王的盛宴 5
007:盗梦空间 12
007:碟中谍 6
007:禁闭岛 8
007:肖申克的救赎 7
华尔街之狼:007 11
华尔街之狼:华尔街之狼 23
华尔街之狼:教父 14
华尔街之狼:星球大战 13
华尔街之狼:沉默的羔羊 9
华尔街之狼:王的盛宴 10
华尔街之狼:盗梦空间 13
华尔街之狼:碟中谍 9
华尔街之狼:禁闭岛 9
华尔街之狼:肖申克的救赎 10
教父:007 12
教父:华尔街之狼 14
教父:教父 25
教父:星球大战 15
教父:沉默的羔羊 11
教父:王的盛宴 12
教父:盗梦空间 17
教父:碟中谍 8
教父:禁闭岛 11
教父:肖申克的救赎 12
星球大战:007 12
星球大战:华尔街之狼 13
星球大战:教父 15
星球大战:星球大战 23
星球大战:沉默的羔羊 12
星球大战:王的盛宴 11
星球大战:盗梦空间 15
星球大战:碟中谍 8
星球大战:禁闭岛 10
星球大战:肖申克的救赎 10
沉默的羔羊:007 7
沉默的羔羊:华尔街之狼 9
沉默的羔羊:教父 11
沉默的羔羊:星球大战 12
沉默的羔羊:沉默的羔羊 21
沉默的羔羊:王的盛宴 11
沉默的羔羊:盗梦空间 12
沉默的羔羊:碟中谍 7
沉默的羔羊:禁闭岛 9
沉默的羔羊:肖申克的救赎 12
王的盛宴:007 5
王的盛宴:华尔街之狼 10
王的盛宴:教父 12
王的盛宴:星球大战 11
王的盛宴:沉默的羔羊 11
王的盛宴:王的盛宴 23
王的盛宴:盗梦空间 14
王的盛宴:碟中谍 10
王的盛宴:禁闭岛 9
王的盛宴:肖申克的救赎 14
盗梦空间:007 12
盗梦空间:华尔街之狼 13
盗梦空间:教父 17
盗梦空间:星球大战 15
盗梦空间:沉默的羔羊 12
盗梦空间:王的盛宴 14
盗梦空间:盗梦空间 29
盗梦空间:碟中谍 11
盗梦空间:禁闭岛 15
盗梦空间:肖申克的救赎 17
碟中谍:007 6
碟中谍:华尔街之狼 9
碟中谍:教父 8
碟中谍:星球大战 8
碟中谍:沉默的羔羊 7
碟中谍:王的盛宴 10
碟中谍:盗梦空间 11
碟中谍:碟中谍 20
碟中谍:禁闭岛 10
碟中谍:肖申克的救赎 11
禁闭岛:007 8
禁闭岛:华尔街之狼 9
禁闭岛:教父 11
禁闭岛:星球大战 10
禁闭岛:沉默的羔羊 9
禁闭岛:王的盛宴 9
禁闭岛:盗梦空间 15
禁闭岛:碟中谍 10
禁闭岛:禁闭岛 24
禁闭岛:肖申克的救赎 12
肖申克的救赎:007 7
肖申克的救赎:华尔街之狼 10
肖申克的救赎:教父 12
肖申克的救赎:星球大战 10
肖申克的救赎:沉默的羔羊 12
肖申克的救赎:王的盛宴 14
肖申克的救赎:盗梦空间 17
肖申克的救赎:碟中谍 11
肖申克的救赎:禁闭岛 12
肖申克的救赎:肖申克的救赎 25
step3: 根据 step-out 用户评分矩阵
输出： 007 用户40：2.5
007 40:2.5
007 41:1.5
007 35:1.5
007 46:2.0
007 17:4.5
007 4:2.0
007 23:2.0
007 28:5.0
007 47:5.0
007 16:5.0
007 19:2.0
007 14:4.0
007 18:4.5
007 39:3.5
007 24:4.0
007 3:4.5
007 26:2.0
007 20:2.0
007 34:5.0
华尔街之狼 38:1.5
华尔街之狼 7:2.5
华尔街之狼 47:3.0
华尔街之狼 40:3.0
华尔街之狼 15:2.5
华尔街之狼 23:4.0
华尔街之狼 19:3.0
华尔街之狼 24:5.0
华尔街之狼 18:5.0
华尔街之狼 49:4.5
华尔街之狼 13:5.0
华尔街之狼 28:5.0
华尔街之狼 45:3.0
华尔街之狼 12:3.0
华尔街之狼 3:2.5
华尔街之狼 9:3.0
华尔街之狼 33:4.5 .。。。。。step4: 根据step3-out和step4-out 计算推荐结果列表（计算电影的评分，根据电影出现的数据*用户对应得评分）
输入：007:007 19/007 40:2.5
输出：19 华尔街之狼,22.0
34 教父,60.0
23 教父,24.0
24 教父,48.0
35 教父,18.0
46 教父,24.0
47 教父,60.0
14 教父,48.0
26 教父,24.0
16 教父,60.0
39 教父,42.0
17 教父,54.0
28 教父,60.0
18 教父,54.0
19 教父,24.0
3 教父,54.0
4 教父,24.0
40 教父,30.0
41 教父,18.0
20 教父,24.0
34 碟中谍,30.0
23 碟中谍,12.0
24 碟中谍,24.0
35 碟中谍,9.0
46 碟中谍,12.0
47 碟中谍,30.0
14 碟中谍,24.0
26 碟中谍,12.0
16 碟中谍,30.0
39 碟中谍,21.0
17 碟中谍,27.0
28 碟中谍,30.0
18 碟中谍,27.0
19 碟中谍,12.0
3 碟中谍,27.0
4 碟中谍,12.0
40 碟中谍,15.0
41 碟中谍,9.0
20 碟中谍,12.0
34 王的盛宴,25.0
23 王的盛宴,10.0
24 王的盛宴,20.0
.....step5: 根据step-out4 合并所有数据
输出：19 华尔街之狼,289.0
1 碟中谍,114.0
1 教父,124.0
1 肖申克的救赎,132.5
1 王的盛宴,107.0
1 盗梦空间,192.5
1 禁闭岛,171.0
1 007,89.0
1 华尔街之狼,101.5
1 沉默的羔羊,94.5
1 星球大战,112.0
2 碟中谍,138.0
2 教父,178.5
2 王的盛宴,192.0
2 肖申克的救赎,225.0
2 盗梦空间,268.5
2 禁闭岛,193.5
2 007,113.5
2 华尔街之狼,142.5
2 沉默的羔羊,146.0
2 星球大战,157.5
3 教父,369.0
3 碟中谍,227.5
3 王的盛宴,248.0
3 肖申克的救赎,273.5
3 盗梦空间,410.5
3 禁闭岛,278.0
3 007,299.0
3 华尔街之狼,317.5
3 沉默的羔羊,240.0
3 星球大战,360.0
4 教父,60.5
4 碟中谍,77.0
4 王的盛宴,48.5
4 肖申克的救赎,59.5
4 盗梦空间,74.0
.....step6: 根据step5-out 排除用户看过得电影，然后把类似得，评分高得优先推荐(排序)。
输出： 1 肖申克的救赎 132.5 1 教父 124.0 1 星球大战 112.0 1 王的盛宴 107.0 1 华尔街之狼 101.5
Movie [userid=1, movieName=肖申克的救赎, score=132.5]
Movie [userid=1, movieName=教父, score=124.0]
Movie [userid=1, movieName=星球大战, score=112.0]
Movie [userid=1, movieName=王的盛宴, score=107.0]
Movie [userid=1, movieName=华尔街之狼, score=101.5]
Movie [userid=1, movieName=沉默的羔羊, score=94.5]
Movie [userid=1, movieName=007, score=89.0]
Movie [userid=2, movieName=教父, score=178.5]
Movie [userid=2, movieName=星球大战, score=157.5]
Movie [userid=2, movieName=沉默的羔羊, score=146.0]
Movie [userid=2, movieName=华尔街之狼, score=142.5]
Movie [userid=2, movieName=碟中谍, score=138.0]
Movie [userid=2, movieName=007, score=113.5]
Movie [userid=3, movieName=肖申克的救赎, score=273.5]
Movie [userid=3, movieName=王的盛宴, score=248.0]
Movie [userid=3, movieName=沉默的羔羊, score=240.0]
Movie [userid=4, movieName=盗梦空间, score=74.0]
Movie [userid=4, movieName=教父, score=60.5]
Movie [userid=4, movieName=星球大战, score=59.0]
Movie [userid=4, movieName=华尔街之狼, score=58.0]
Movie [userid=4, movieName=王的盛宴, score=48.5]
Movie [userid=4, movieName=沉默的羔羊, score=45.0]
Movie [userid=5, movieName=盗梦空间, score=172.0]
Movie [userid=5, movieName=王的盛宴, score=149.5]
Movie [userid=5, movieName=教父, score=133.5]
Movie [userid=5, movieName=禁闭岛, score=130.5]
Movie [userid=5, movieName=星球大战, score=128.0]
Movie [userid=5, movieName=华尔街之狼, score=117.5]
Movie [userid=5, movieName=007, score=84.5]
Movie [userid=6, movieName=盗梦空间, score=160.0]
Movie [userid=6, movieName=肖申克的救赎, score=160.0]
Movie [userid=6, movieName=星球大战, score=136.0]
Movie [userid=6, movieName=教父, score=135.0]
Movie [userid=6, movieName=华尔街之狼, score=121.0]
Movie [userid=6, movieName=禁闭岛, score=121.0]
Movie [userid=6, movieName=007, score=79.0]
Movie [userid=7, movieName=盗梦空间, score=178.5]
Movie [userid=7, movieName=教父, score=149.0]
Movie [userid=7, movieName=星球大战, score=134.5]
Movie [userid=7, movieName=沉默的羔羊, score=130.0]
Movie [userid=7, movieName=禁闭岛, score=124.5]
Movie [userid=7, movieName=007, score=86.0]
Movie [userid=8, movieName=沉默的羔羊, score=231.5]
Movie [userid=8, movieName=碟中谍, score=203.0]
Movie [userid=8, movieName=007, score=202.0]
Movie [userid=9, movieName=肖申克的救赎, score=335.5]
Movie [userid=9, movieName=007, score=269.5]
Movie [userid=9, movieName=碟中谍, score=238.5]
Movie [userid=10, movieName=星球大战, score=243.5]
.....代码：
package com.huhu.day06;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import org.apache.hadoop.io.WritableComparable;
public class Movie implements WritableComparable<Movie> {
private int userid;
private String movieName;
private float score;
public Movie() {
super();
}
public Movie(int userid, String movieName, float score) {
super();
this.userid = userid;
this.movieName = movieName;
this.score = score;
}
public int getUserid() {
return userid;
}
public void setUserid(int userid) {
this.userid = userid;
}
public String getMovieName() {
return movieName;
}
public void setMovieName(String movieName) {
this.movieName = movieName;
}
public float getScore() {
return score;
}
public void setScore(float score) {
this.score = score;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((movieName == null) ? 0 : movieName.hashCode());
result = prime * result + Float.floatToIntBits(score);
result = prime * result + userid;
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Movie other = (Movie) obj;
if (movieName == null) {
if (other.movieName != null)
return false;
} else if (!movieName.equals(other.movieName))
return false;
if (Float.floatToIntBits(score) != Float.floatToIntBits(other.score))
return false;
if (userid != other.userid)
return false;
return true;
}
@Override
public String toString() {
return "Movie [userid=" + userid + ", movieName=" + movieName + ", score=" + score + "]";
}
@Override
public void readFields(DataInput in) throws IOException {
this.userid = in.readInt();
this.movieName = in.readUTF();
this.score = in.readFloat();
}
@Override
public void write(DataOutput out) throws IOException {
out.writeInt(userid);
out.writeUTF(movieName);
out.writeFloat(score);
}
@Override
public int compareTo(Movie o) {
if (this.userid == o.getUserid()) {
if (this.score == o.score) {
return this.movieName.compareTo(o.movieName);
} else {
return (int) (o.getScore() - this.score);
}
} else {
return this.userid - o.getUserid();
}
}
}
package com.huhu.day06;
import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
/**
* 输入： 1 盗梦空间 4.0
*
* 输出 ： 1 盗梦空间:4.0,碟中谍:1.5,禁闭岛:4.0
*
* @author huhu_k
*
*/
public class Step1 {
static class MyMapper extends Mapper<LongWritable, Text, IntWritable, Text> {
@Override
protected void map(LongWritable key, Text value, Mapper<LongWritable, Text, IntWritable, Text>.Context context)
throws IOException, InterruptedException {
String[] line = value.toString().split(" ");
// k:用户 v: item电影名称：分数
context.write(new IntWritable(Integer.valueOf(line[0])), new Text(line[1] + ":" + line[2]));
}
}
// 相同key的数据相遇 k:1 v:{}
static class MyReduce extends Reducer<IntWritable, Text, IntWritable, Text> {
Text va = new Text();
@Override
protected void reduce(IntWritable key, Iterable<Text> values, Context context)
throws IOException, InterruptedException {
StringBuffer br = new StringBuffer();
for (Text v : values) {
br.append("," + v.toString());
}
va.set(br.toString().replaceFirst(",", ""));
// k:用户id v：电影1：评分,电影2：评分.....
// 1 盗梦空间:4.0,碟中谍:1.5,禁闭岛:4.0
context.write(key, va);
}
}
public Job getJob(Configuration conf) throws Exception {
Path inpath = new Path("hdfs://ry-hadoop1:8020/in/items.txt");
Path outpath = new Path("hdfs://ry-hadoop1:8020/out/day06/step1");
Job job = Job.getInstance(conf, this.getClass().getSimpleName());
job.setJarByClass(this.getClass());
job.setMapperClass(MyMapper.class);
job.setMapOutputKeyClass(IntWritable.class);
job.setMapOutputValueClass(Text.class);
job.setReducerClass(MyReduce.class);
job.setOutputKeyClass(IntWritable.class);
job.setOutputValueClass(Text.class);
FileInputFormat.addInputPath(job, inpath);
FileOutputFormat.setOutputPath(job, outpath);
return job;
}
}
package com.huhu.day06;
import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
/**
* 输入：1 盗梦空间:4.0,碟中谍:1.5,禁闭岛:4.0
*
* 输出 ：007 40:2.5
*
* @author huhu_k
*
*/
public class Step3 {
static class MyMapper extends Mapper<LongWritable, Text, Text, Text> {
@Override
protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
String[] line = value.toString().split(" ");
String userid = line[0];
String[] item = line[1].split(",");
for (String it : item) {
context.write(new Text(it.split(":")[0]), new Text(userid + ":"+new Text(it.split(":")[1])));
}
}
}
public Job getJob(Configuration conf) throws Exception {
Path inpath = new Path("hdfs://ry-hadoop1:8020/out/day06/step1");
Path outpath = new Path("hdfs://ry-hadoop1:8020/out/day06/step3");
Job job = Job.getInstance(conf, this.getClass().getSimpleName());
job.setJarByClass(Step3.class);
job.setMapperClass(MyMapper.class);
job.setMapOutputKeyClass(Text.class);
job.setMapOutputValueClass(Text.class);
FileInputFormat.addInputPath(job, inpath);
FileOutputFormat.setOutputPath(job, outpath);
return job;
}
}
package com.huhu.day06;
import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
/**
* 商品同现矩阵 输出 ：1 盗梦空间:4.0,碟中谍:1.5,禁闭岛:4.0
*
* 输出：007:007 19
*
* @author huhu_k
*
*/
public class Step2 {
static class MyMapper extends Mapper<LongWritable, Text, Text, IntWritable> {
private Text k = new Text();
private final IntWritable one = new IntWritable(1);
@Override
protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
//盗梦空间:4.0 碟中谍:1.5 禁闭岛:4.0
String[] line = value.toString().split(" ")[1].split(",");
System.err.println(line+"----------------------");
for (int i = 0; i < line.length; i++) {
for (int j = 0; j < line.length; j++) {
k.set(line[i].split(":")[0] + ":" + line[j].split(":")[0]);
// k: 盗梦空间:碟中谍 1 每个人看过所有电影的乘积
context.write(k, one);
}
}
}
}
static class MyReducer extends Reducer<Text, IntWritable, Text, IntWritable> {
// k: 盗梦空间:碟中谍 1
@Override
protected void reduce(Text key, Iterable<IntWritable> values, Context context)
throws IOException, InterruptedException {
int sum = 0;
for (IntWritable v : values) {
sum += v.get();
}
// k:007:007 v:19
context.write(key, new IntWritable(sum));
}
}
public Job getJob(Configuration conf) throws Exception {
Path inpath = new Path("hdfs://ry-hadoop1:8020/out/day06/step1");
Path outpath = new Path("hdfs://ry-hadoop1:8020/out/day06/step2");
Job job = Job.getInstance(conf, this.getClass().getSimpleName());
job.setJarByClass(this.getClass());
job.setMapperClass(MyMapper.class);
job.setMapOutputKeyClass(Text.class);
job.setMapOutputValueClass(IntWritable.class);
job.setReducerClass(MyReducer.class);
job.setOutputKeyClass(Text.class);
job.setOutputValueClass(IntWritable.class);
FileInputFormat.addInputPath(job, inpath);
FileOutputFormat.setOutputPath(job, outpath);
return job;
}
}
package com.huhu.day06;
import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
/**
* 输入：1 盗梦空间:4.0,碟中谍:1.5,禁闭岛:4.0
*
* 输出 ：007 40:2.5
*
* @author huhu_k
*
*/
public class Step3 {
static class MyMapper extends Mapper<LongWritable, Text, Text, Text> {
@Override
protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
String[] line = value.toString().split(" ");
String userid = line[0];
String[] item = line[1].split(",");
for (String it : item) {
context.write(new Text(it.split(":")[0]), new Text(userid + ":"+new Text(it.split(":")[1])));
}
}
}
public Job getJob(Configuration conf) throws Exception {
Path inpath = new Path("hdfs://ry-hadoop1:8020/out/day06/step1");
Path outpath = new Path("hdfs://ry-hadoop1:8020/out/day06/step3");
Job job = Job.getInstance(conf, this.getClass().getSimpleName());
job.setJarByClass(Step3.class);
job.setMapperClass(MyMapper.class);
job.setMapOutputKeyClass(Text.class);
job.setMapOutputValueClass(Text.class);
FileInputFormat.addInputPath(job, inpath);
FileOutputFormat.setOutputPath(job, outpath);
return job;
}
}
package com.huhu.day06;
import java.io.IOException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.FileSplit;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
/**
* step4: 计算推荐结果列表 输入：007:007 19 输入：007 40:2.5
*
* 输出：19 华尔街之狼,22.0
*
* @author huhu_k
*
*/
public class Step4 {
static class MyMapper extends Mapper<LongWritable, Text, Text, Text> {
String filename = "";
@Override
protected void setup(Context context) throws IOException, InterruptedException {
FileSplit inputSplit = (FileSplit) context.getInputSplit();
// 获取父文件名
filename = inputSplit.getPath().getParent().getName();
}
@Override
protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
String[] line = value.toString().split(" ");
if ("step2".equals(filename)) {
String[] v1 = line[0].split(":");
String item1 = v1[0];
String item2 = v1[1];
String num = line[1];
context.write(new Text(item1), new Text("A:" + item2 + "," + num));
} else if ("step3".equals(filename)) {
String item = line[0];
String userid = line[1].split(":")[0];
String score = line[1].split(":")[1];
context.write(new Text(item), new Text("B:" + userid + "," + score));
}
}
}
// 相同key的数据相遇 k:1 v:{}
static class MyReduce extends Reducer<Text, Text, Text, Text> {
// k: 电影名称 v：A:007,20 来自于商品同现矩阵
// k: 电影名称 v：B:1,4 来自于用户评分矩阵
String[] info = null;
@Override
protected void reduce(Text key, Iterable<Text> values, Context context)
throws IOException, InterruptedException {
Map<String, String> mapA = new HashMap<>();
Map<String, String> mapB = new HashMap<>();
for (Text va : values) {
String src = va.toString();
if (src.startsWith("A:")) {
// A:电影名称，次数
info = src.substring(2).split(",");
// mapA k: 电影名称 v:次数
mapA.put(info[0], info[1]);
} else if (src.startsWith("B:")) {
// B:用户，评分
info = src.substring(2).split(",");
// mapB k: 用户 v:评分
mapB.put(info[0], info[1]);
}
}
float result = 0;
Iterator<String> iterator = mapA.keySet().iterator();
while (iterator.hasNext()) {
String item = iterator.next();
int num = Integer.parseInt(mapA.get(item));
Iterator<String> iterator2 = mapB.keySet().iterator();
while (iterator2.hasNext()) {
String userid = iterator2.next();
float score = Float.valueOf(mapB.get(userid));
result = score * num;
context.write(new Text(userid), new Text(item + "," + result));
}
}
}
}
public Job getJob(Configuration conf) throws Exception {
Path inpath1 = new Path("hdfs://ry-hadoop1:8020/out/day06/step2");
Path inpath2 = new Path("hdfs://ry-hadoop1:8020/out/day06/step3");
Path outpath = new Path("hdfs://ry-hadoop1:8020/out/day06/step4");
Job job = Job.getInstance(conf, this.getClass().getSimpleName());
job.setJarByClass(Step4.class);
job.setMapperClass(MyMapper.class);
job.setMapOutputKeyClass(Text.class);
job.setMapOutputValueClass(Text.class);
job.setReducerClass(MyReduce.class);
job.setOutputKeyClass(Text.class);
job.setOutputValueClass(Text.class);
FileInputFormat.addInputPath(job, inpath1);
FileInputFormat.addInputPath(job, inpath2);
FileOutputFormat.setOutputPath(job, outpath);
return job;
}
}
package com.huhu.day06;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
/**
* step5: 合并结果列表 输入：19 华尔街之狼,22.0
*
* 输出：19 华尔街之狼,229.0
*
* @author huhu_k
*
*/
public class Step5 {
static class MyMapper extends Mapper<LongWritable, Text, IntWritable, Text> {
@Override
protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
String[] line = value.toString().split(" ");
context.write(new IntWritable(Integer.parseInt(line[0])), new Text(line[1]));
}
}
// 相同key的数据相遇 k:1 v:{}
static class MyReduce extends Reducer<IntWritable, Text, IntWritable, Text> {
// k: 电影名称 v：A:007,20 来自于商品同现矩阵
// k: 电影名称 v：B:1,4 来自于用户评分矩阵
@Override
protected void reduce(IntWritable key, Iterable<Text> values, Context context)
throws IOException, InterruptedException {
Map<String, Float> map = new HashMap<>();
for (Text v : values) {
String[] str = v.toString().split(",");
String item = str[0];
float score = Float.valueOf(str[1]);
if (map.containsKey(item)) {
map.put(item, map.get(item) + score);
} else {
map.put(item, score);
}
}
for (Map.Entry<String, Float> m : map.entrySet()) {
context.write(key, new Text(m.getKey() + "," + m.getValue()));
}
}
}
public Job getJob(Configuration conf) throws Exception {
Path inpath1 = new Path("hdfs://ry-hadoop1:8020/out/day06/step4");
Path outpath = new Path("hdfs://ry-hadoop1:8020/out/day06/step5");
Job job = Job.getInstance(conf, this.getClass().getSimpleName());
job.setJarByClass(Step5.class);
job.setMapperClass(MyMapper.class);
job.setMapOutputKeyClass(IntWritable.class);
job.setMapOutputValueClass(Text.class);
job.setReducerClass(MyReduce.class);
job.setOutputKeyClass(IntWritable.class);
job.setOutputValueClass(Text.class);
FileInputFormat.addInputPath(job, inpath1);
FileOutputFormat.setOutputPath(job, outpath);
return job;
}
}
package com.huhu.day06;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.net.URI;
import java.util.HashMap;
import java.util.Map;
import java.util.TreeSet;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.filecache.DistributedCache;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
/**
* 输入：排除 用户看过的电影，并且 排序输出 降序 输入：19 华尔街之狼,289.0
*
* 输出 ：1 肖申克的救赎 132.5 1 教父 124.0 1 星球大战 112.0 1 王的盛宴 107.0 1 华尔街之狼 101.5
*
* @author huhu_k
*
*/
public class Step6 {
static class MyMapper extends Mapper<LongWritable, Text, IntWritable, Text> {
private Map<Integer, String> map;
private Path[] localFiles;
@Override
protected void setup(Context context) throws IOException, InterruptedException {
map = new HashMap<>();
Configuration conf = context.getConfiguration();
localFiles = DistributedCache.getLocalCacheFiles(conf);
for (Path p : localFiles) {
BufferedReader br = new BufferedReader(new FileReader(p.toString()));
String word = "";
while ((word = br.readLine()) != null) {
String[] s = word.split(" ");
int userid = Integer.parseInt(s[0]);
String item = s[1];
if (map.containsKey(userid)) {
// 1 007;008
map.put(userid, map.get(userid) + ";" + item);
} else {
// 1 007
map.put(userid, item);
}
}
br.close();
}
}
@Override
protected void map(LongWritable key, Text value, Mapper<LongWritable, Text, IntWritable, Text>.Context context)
throws IOException, InterruptedException {
String[] line = value.toString().split(" ");
// 19 华尔街之狼,289.0
int userid = Integer.valueOf(line[0]);
String movie = line[1].split(",")[0];
String movieList = map.get(userid);
// map得到null 第一次来 没有任何数据
if (movieList == null || movieList.length() == 0 || movieList == "" || !movieList.contains(movie)) {
context.write(new IntWritable(userid), new Text(line[1]));
}
}
}
// 相同key的数据相遇 k:1 v:{}
static class MyReduce extends Reducer<IntWritable, Text, Movie, NullWritable> {
private TreeSet<Movie> set = new TreeSet<>();
@Override
protected void reduce(IntWritable key, Iterable<Text> values, Context context)
throws IOException, InterruptedException {
for (Text v : values) {
Movie m = new Movie(Integer.parseInt(key.toString()), v.toString().split(",")[0],
Float.parseFloat(v.toString().split(",")[1]));
set.add(m);
}
}
@Override
protected void cleanup(Context context) throws IOException, InterruptedException {
for (Movie m : set) {
context.write(m, NullWritable.get());
}
}
}
public Job getJob(Configuration conf) throws Exception {
Path inpath = new Path("hdfs://ry-hadoop1:8020/out/day06/step5");
Path outpath = new Path("hdfs://ry-hadoop1:8020/out/day06/step6");
DistributedCache.addCacheFile(new URI("hdfs://ry-hadoop1:8020/in/items.txt"), conf);
Job job = Job.getInstance(conf, this.getClass().getSimpleName());
job.setJarByClass(Step6.class);
job.setMapperClass(MyMapper.class);
job.setMapOutputKeyClass(IntWritable.class);
job.setMapOutputValueClass(Text.class);
job.setReducerClass(MyReduce.class);
job.setOutputKeyClass(Movie.class);
job.setOutputValueClass(NullWritable.class);
FileInputFormat.addInputPath(job, inpath);
FileOutputFormat.setOutputPath(job, outpath);
return job;
}
}
package com.huhu.day06;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.mapreduce.lib.jobcontrol.ControlledJob;
import org.apache.hadoop.mapreduce.lib.jobcontrol.JobControl;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
public class Movie_App extends ToolRunner implements Tool {
private Configuration con;
public static void main(String[] args) throws Exception {
Movie_App m = new Movie_App();
int num = ToolRunner.run(m.getConf(), m, args);
System.exit(num);
}
@Override
public Configuration getConf() {
if (con == null) {
return new Configuration();
}
return con;
}
@Override
public void setConf(Configuration arg0) {
}
@Override
public int run(String[] arg0) throws Exception {
Step1 step1 = new Step1();
Step2 step2 = new Step2();
Step3 step3 = new Step3();
Step4 step4 = new Step4();
Step5 step5 = new Step5();
Step6 step6 = new Step6();
ControlledJob controlledJob1 = new ControlledJob(step1.getJob(getConf()).getConfiguration());
ControlledJob controlledJob2 = new ControlledJob(step2.getJob(getConf()).getConfiguration());
ControlledJob controlledJob3 = new ControlledJob(step3.getJob(getConf()).getConfiguration());
ControlledJob controlledJob4 = new ControlledJob(step4.getJob(getConf()).getConfiguration());
ControlledJob controlledJob5 = new ControlledJob(step5.getJob(getConf()).getConfiguration());
ControlledJob controlledJob6 = new ControlledJob(step6.getJob(getConf()).getConfiguration());
controlledJob2.addDependingJob(controlledJob1);
controlledJob3.addDependingJob(controlledJob1);
controlledJob4.addDependingJob(controlledJob2);
controlledJob4.addDependingJob(controlledJob3);
controlledJob5.addDependingJob(controlledJob4);
controlledJob6.addDependingJob(controlledJob5);
JobControl jobControl = new JobControl("Movive");
jobControl.addJob(controlledJob1);
jobControl.addJob(controlledJob2);
jobControl.addJob(controlledJob3);
jobControl.addJob(controlledJob4);
jobControl.addJob(controlledJob5);
jobControl.addJob(controlledJob6);
Thread t = new Thread(jobControl);
t.start();
while (!jobControl.allFinished()) {
t.sleep(1000);
}
jobControl.stop();
return 0;
}
}
关于什么是矩阵：我看了两篇比较好得，推荐给大家。
https://blog.csdn.net/xyilu/article/details/9066973
https://blog.csdn.net/liuxinghao/article/details/39958957