Hadoop一直处于初始化状态（引起原因不详，但问题解决）

来源：互联网发布：淘宝怎么开通微淘编辑：程序博客网时间：2024/05/21 11:11

Hadoop启动时正常，但登录http://namenode:50030,页面中一直显示state：INITIALIZING。查看namenode的日志有如下异常抛出：

INFO org.apache.hadoop.ipc.Server: IPC Server handler 1 on 9000, call delete(/home/hadoop/tmp/mapred/system, true) from 10.214.30.56:39837: error: org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot delete /home/hadoop/tmp/mapred/system. Name node is in safe mode.
The ratio of reported blocks 0.0000 has not reached the threshold 0.9990. Safe mode will be turned off automatically.
org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot delete /home/hadoop/tmp/mapred/system. Name node is in safe mode.

我上网查了一通这个问题解决啦，但是一直没有找到引起这个问题原因，希望哪位大神能指点迷津。解决方案如下：

1. 停止jobtraker和tasktrackers：bin/stop-mapred.sh
2.禁止namenode的安全模式:bin/hadoop dfsadmin -safemode leave
3.再次启动jobtracker和tasktrackers：bin/start-mapred.sh