map 0% reduce 0% 然后就結束了，請問知道是什么問題嗎？
[root@VM_0_2_centos wordcount]# hadoop jar word_count_class/wordcount.jar WordCount input_wordcount output_wordcount
Warning: $HADOOP_HOME is deprecated.
19/04/24 18:42:32 WARN mapred.JobClient: Use GenericOptionsParser for parsing the arguments. Applications should implement Tool for the same.
19/04/24 18:42:32 INFO input.FileInputFormat: Total input paths to process : 2
19/04/24 18:42:32 INFO util.NativeCodeLoader: Loaded the native-hadoop library
19/04/24 18:42:32 WARN snappy.LoadSnappy: Snappy native library not loaded
19/04/24 18:42:32 INFO mapred.JobClient: Running job: job_201904241555_0006
19/04/24 18:42:33 INFO mapred.JobClient:? map 0% reduce 0%
19/04/24 18:42:33 INFO mapred.JobClient: Job complete: job_201904241555_0006
19/04/24 18:42:33 INFO mapred.JobClient: Counters: 0
2020-05-26
hadoop fs -ls /user/root/output_wordcount/_logs/history
用上述命令切換到日志目錄去查看錯誤信息，我是因為主機名錯誤。