Hadoop:start-dfs.sh 连接被拒绝 [英] Hadoop : start-dfs.sh Connection refused

问题描述

我在 debian/stretch64 上有一个 vagrant box我尝试使用文档安装 Hadoop3http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/SingleCluster.htm

I have a vagrant box on debian/stretch64 I try to install Hadoop3 with documentation http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/SingleCluster.htm

当我运行 start-dfs.sh我有这条消息

When I run start-dfs.sh I have this message

vagrant@stretch:/opt/hadoop$ sudo sbin/start-dfs.sh
Starting namenodes on [localhost]
pdsh@stretch: localhost: connect: Connection refused
Starting datanodes
pdsh@stretch: localhost: connect: Connection refused
Starting secondary namenodes [stretch]
pdsh@stretch: stretch: connect: Connection refused
vagrant@stretch:/opt/hadoop$

当然，我尝试使用以下命令更新我的 hadoop-env.sh:导出 HADOOP_SSH_OPTS="-p 22"

of course I tried to update my hadoop-env.sh with : export HADOOP_SSH_OPTS="-p 22"

ssh localhost 工作(无密码)

ssh localhost work (without password)

我不知道我可以改变什么来解决这个问题

I have not ideas what I can change to solve this problem

推荐答案

pdsh 默认工作方式存在问题(见编辑)，但 Hadoop 可以不用它.Hadoop 检查系统是否在 /usr/bin/pdsh 上有 pdsh，如果有就使用它.摆脱使用 pdsh 的一种简单方法是编辑 $HADOOP_HOME/libexec/hadoop-functions.sh

There is a problem the way pdsh works by default (see edit), but Hadoop can go without it. Hadoop checks if the system has pdsh on /usr/bin/pdsh and uses it if so. An easy way get away from using pdsh is editing $HADOOP_HOME/libexec/hadoop-functions.sh

换行

if [[ -e '/usr/bin/pdsh' ]]; then

通过

if [[ ! -e '/usr/bin/pdsh' ]]; then

然后 hadoop 没有 pdsh 并且一切正常.

then hadoop goes without pdsh and everything works.

更好的解决方案是使用 pdsh，但使用 ssh 而不是 rsh，如 这里，所以替换 $HADOOP_HOME/libexec/hadoop-functions.sh 中的行:

A better solution would be use pdsh, but with ssh instead rsh as explained here, so replace line from $HADOOP_HOME/libexec/hadoop-functions.sh:

PDSH_SSH_ARGS_APPEND="${HADOOP_SSH_OPTS}" pdsh 

通过

PDSH_RCMD_TYPE=ssh PDSH_SSH_ARGS_APPEND="${HADOOP_SSH_OPTS}" pdsh 

Obs:正如我在评论中提到的那样，仅执行 export PDSH_RCMD_TYPE=ssh 是行不通的.不知道为什么……

Obs: Only doing export PDSH_RCMD_TYPE=ssh, as I mention in the comment, doesn't work. I don't know why...

我还打开了一个问题并提交了一个补丁来解决这个问题:HADOOP-15219

I've also opened a issue and submitted a patch to this problem: HADOOP-15219

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