Question

在伪分布式模式下安装hadoop时，我的情况正在低于错误

Starting namenodes on [localhost]
localhost: namenode running as process 20678. Stop it first.
localhost: datanode running as process 20831. Stop it first.
Starting secondary namenodes [0.0.0.0]
The authenticity of host '0.0.0.0 (0.0.0.0)' can't be established

我错误地执行了以下命令

hduser@x7158796-dsmprojb:/usr/local/hadoop$ export HADOOP_CONF_DIR=$HADOOP_INSTALL:etc/hadoop/
hduser@x7158796-dsmprojb:/usr/local/hadoop$ sbin/start-dfs.sh
Error: JAVA_HOME is not set and could not be found

现在它显示java home未设置

我是linux的新手，任何人都可以帮忙解决这个问题。

Answer 1

这里有几个例子，您可以找到Setting java home

并且有几种方法可以找到java home

在RedHat上

sudo /usr/sbin/alternatives --config java

然后

export JAVA_HOME=<replace me with from above alteratives command>

在shell中或将其添加到.profile / .bashrc / etc

export HADOOP_CONF_DIR = $ HADOOP_INSTALL：etc / hadoop /

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