摘要：
map: (K1, V1) → list(K2, V2)reduce: (K2, list(V2)) → list(K3, V3)(K1, V1):jobConf.setInputKeyClass(K1. class );jobConf.setInputValueClass(V1. class );list(K2, V2):job.setMapOutputKeyClass(K2.class);job.setMapOutputValueClass(V2.class); list(K3, V3):jobConf.setOutputKeyClass(K3. class );jobConf.setOu 阅读全文
