1.
Starting namenodes on [localhost]
localhost: chown: 无法访问"/usr/local/hadoop/logs": 没有那个文件或目录
localhost: starting namenode, logging to /usr/local/hadoop/logs/hadoop-dblab-namenode-dblab-virtual-machine.out
localhost: /usr/local/hadoop/sbin/hadoop-daemon.sh: 行 159: /usr/local/hadoop/logs/hadoop-dblab-namenode-dblab-virtual-machine.out: 没有那个文件或目录
localhost: head: 无法打开"/usr/local/hadoop/logs/hadoop-dblab-namenode-dblab-virtual-machine.out" 读取数据: 没有那个文件或目录
localhost: /usr/local/hadoop/sbin/hadoop-daemon.sh: 行 177: /usr/local/hadoop/logs/hadoop-dblab-namenode-dblab-virtual-machine.out: 没有那个文件或目录
localhost: /usr/local/hadoop/sbin/hadoop-daemon.sh: 行 178: /usr/local/hadoop/logs/hadoop-dblab-namenode-dblab-virtual-machine.out: 没有那个文件或目录
localhost: mkdir: 无法创建目录"/usr/local/hadoop/logs": 权限不够
localhost: chown: 无法访问"/usr/local/hadoop/logs": 没有那个文件或目录
localhost: starting datanode, logging to /usr/local/hadoop/logs/hadoop-dblab-datanode-dblab-virtual-machine.out
localhost: /usr/local/hadoop/sbin/hadoop-daemon.sh: 行 159: /usr/local/hadoop/logs/hadoop-dblab-datanode-dblab-virtual-machine.out: 没有那个文件或目录
localhost: head: 无法打开"/usr/local/hadoop/logs/hadoop-dblab-datanode-dblab-virtual-machine.out" 读取数据: 没有那个文件或目录
localhost: /usr/local/hadoop/sbin/hadoop-daemon.sh: 行 177: /usr/local/hadoop/logs/hadoop-dblab-datanode-dblab-virtual-machine.out: 没有那个文件或目录
localhost: /usr/local/hadoop/sbin/hadoop-daemon.sh: 行 178: /usr/local/hadoop/logs/hadoop-dblab-datanode-dblab-virtual-machine.out: 没有那个文件或目录
Starting secondary namenodes [0.0.0.0]
0.0.0.0: mkdir: 无法创建目录"/usr/local/hadoop/logs": 权限不够
0.0.0.0: chown: 无法访问"/usr/local/hadoop/logs": 没有那个文件或目录
0.0.0.0: starting secondarynamenode, logging to /usr/local/hadoop/logs/hadoop-dblab-secondarynamenode-dblab-virtual-machine.out
0.0.0.0: /usr/local/hadoop/sbin/hadoop-daemon.sh: 行 159: /usr/local/hadoop/logs/hadoop-dblab-secondarynamenode-dblab-virtual-machine.out: 没有那个文件或目录
0.0.0.0: head: 无法打开"/usr/local/hadoop/logs/hadoop-dblab-secondarynamenode-dblab-virtual-machine.out" 读取数据: 没有那个文件或目录
0.0.0.0: /usr/local/hadoop/sbin/hadoop-daemon.sh: 行 177: /usr/local/hadoop/logs/hadoop-dblab-secondarynamenode-dblab-virtual-machine.out: 没有那个文件或目录
0.0.0.0: /usr/local/hadoop/sbin/hadoop-daemon.sh: 行 178: /usr/local/hadoop/logs/hadoop-dblab-secondarynamenode-dblab-virtual-machine.out: 没有那个文件或目录
dblab@dblab-virtual-machine:/usr/local/hadoop$ sudo chown -R niugen /usr/local/hadoop
解决方法：
sudo chown -R 你自己电脑到用户名 /usr/local/hadoop
设置权限之后再继续之前到安装就OK了
2.Error: JAVA_HOME is not set and could not be found. 的错误，则说明之前设置 JAVA_HOME 环境变量那边就没设置好，请按教程先设置好 JAVA_HOME 变量，否则后面的过程都是进行不下去的。如果已经按照前面教程在.bashrc文件中设置了JAVA_HOME，还是出现 Error: JAVA_HOME is not set and could not be found. 的错误，那么，请到hadoop的安装目录修改配置文件“/usr/local/hadoop/etc/hadoop/hadoop-env.sh”，在里面找到“export JAVA_HOME=${JAVA_HOME}”这行，然后，把它修改成JAVA安装路径的具体地址，比如，
“export JAVA_HOME=/usr/lib/jvm/你自己到java版本”，然后，再次启动Hadoop。