遇到問題：

10/01/18 20:52:39 INFO input.FileInputFormat: Total input paths to process : 2
10/01/18 20:52:39 INFO mapred.JobClient: Running job: job_201001181452_0038
10/01/18 20:52:40 INFO mapred.JobClient:  map 0% reduce 0%
10/01/18 20:52:50 INFO mapred.JobClient: Task Id : attempt_201001181452_0038_m_000000_0, Status : FAILED
java.io.IOException: Type mismatch in key from map: expected org.apache.hadoop.io.Text, recieved org.apache.hadoop.io.LongWritable

待解