spark启动失败：localhost failed to add the host to the list of known hosts

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问题描述：安装了 spark（单机集群模式），启动命令：

$SPARK_HOME/sbin/start-all.sh

报错：localhost failed to add the host to the list of known hosts

解决办法：

ssh-keygen -t rsa
ssh-copy-id username@127.0.0.1

username 为我们的本地用户名。

参考链接：https://stackoverflow.com/questions/34928228/failed-to-add-the-host-to-the-list-of-known-hosts-how-to-debug/34928589

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