hadoop执行jar包时报 org.apache.hadoop.mapred.InvalidInputException: Input path does not exis

执行hadoop jar MaxTemperature.jar sample.txt output会报Exception in thread "main" org.apache.hadoop.mapred.InvalidInputException: Input path does not exist: hdfs://localhost:9000/user/root/sample.txt 
原因是没有将文件上传到hdfs，因此需要上传到hdfs
上传时，需要在hdfs建好目录 hadoop fs -mkdir  /test/ch02
然后上传hadoop fs -put sample.txt /user/root/test/
最后执行hadoop jar MaxTemperature.jar /user/root/test/sample.txt output
执行完毕后hadoop fs -ls /user/root/output
hadoop fs -cat /user/root/output/part-00000 就可以看到运行结果了