Hadoop之路，蠢的错误

13/11/07 08:45:08 INFO mapred.JobClient: Task Id : attempt_201311070843_0001_r_000000_0, Status : FAILED
java.lang.RuntimeException: java.lang.NoSuchMethodException:

忘了将一个程序中的map reduce方法改成static

java.lang.NoSuchMethodException: DataJoin$TaggedWritable.<init>()

第二个job忘了job2.setJarByClass(Mr_1.class);