error: java.io.IOException: File /opt/data/hadoop/地图red/mrsystem/jobtracker.inf
error: java.io.IOException: File /opt/data/hadoop/mapred/mrsystem/jobtracker.inf
hadoop开启以root用户出错：
error: java.io.IOException: File /opt/data/hadoop/mapred/mrsystem/jobtracker.info could only be replicated to 0 nodes, instead of 1
解决方案：