为什么明明输入目录已存在，运行时却依然提示目录不存在呢？
错误信息：
INFO 10-10 16:30:08,284 - Shell 2 - (stderr) Exception in thread "main" org.apache.hadoop.mapreduce.lib.input.InvalidInputException: Input path does not exist: file:/usr/hadoop/search_log/data_in/2012-10-09 IN
错误信息：
INFO 10-10 16:30:08,284 - Shell 2 - (stderr) Exception in thread "main" org.apache.hadoop.mapreduce.lib.input.InvalidInputException: Input path does not exist: file:/usr/hadoop/search_log/data_in/2012-10-09 IN
