Ubuntu hadoop在未停止dfs的情况下重新启动后不工作

我安装了Hadoop2.6，一切似乎都正常。然后，我在没有停止dfs的情况下重新启动了所有机器，我得到了下面的错误。有办法解决吗

$ ./sbin/start-dfs.sh 

./sbin/start-dfs.sh: line 55: $hadoop/bin/bin/hdfs: No such file or directory
Starting namenodes on []
./sbin/start-dfs.sh: line 60: $hadoop/bin/sbin/hadoop-daemons.sh: No such file or directory
./sbin/start-dfs.sh: line 73: $hadoop/bin/sbin/hadoop-daemons.sh: No such file or directory
./sbin/start-dfs.sh: line 108: $hadoop/bin/bin/hdfs: No such file or directory


~/hadoop$ ./bin/hadoop namenode -format
DEPRECATED: Use of this script to execute hdfs command is deprecated.
Instead use the hdfs command for it.

HADOOP_HDFS_HOME not found!
~/hadoop$ ./bin/hdfs namenode -format
Error: Could not find or load main class org.apache.hadoop.hdfs.server.namenode.NameNode

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在.bashrc和hadoop-env.sh中设置环境变量

export HADOOP_HDFS_HOME=$HADOOP_HOME