Hadoop伪分布式安装，ERROR namenode.NameNode: Failed to start namenode.
Hadoop伪分布式安装，配置完成后，执行 NameNode 的格式化:$./bin/hdfs namenode -format出现以下错误：ERROR namenode.NameNode: Failed to start namenode.java.io.IOException: Cannot create directory /usr/local/hadoop/tmp/dfs...
