export HADOOP_CONF_DIR=$HADOOP_INSTALL:etc/hadoop/

Question

在伪分布式模式下安装hadoop时，我最初得到以下错误

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

我错误地执行了下面的命令

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，它显示未设置java home

我是linux的新手，有人能帮上忙吗？

Answer 1

这里有几个你可以找到Setting java home的例子

有几种方法可以找到java的主页。

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/等