hadoop - 在 hadoop 多节点集群上启动 HDFS 守护进程时出错。Datanode 未启动

Question

我正在尝试设置 hadoop 集群并在连接数据节点时出现以下错误。Namenode 已启动并运行良好，但数据节点正在产生问题。/etc/hosts 文件在两个节点上都可用。IP 表已停止(f/w)。ssh 发生。

2015-05-20 20:54:05,008 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: nn1.cluster1.com/192.168.1.11:9000. Already tried 9 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS) 2015-05-20 20:54:05,017 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: java.io.IOException: Call to nn1.cluster1.com/192.168.1.11:9000 failed on local exception: java.net.NoRouteToHostException: No route to host

Answer 1

java.io.IOException: Call to nn1.cluster1.com/192.168.1.11:9000 failed on local exception: java.net.NoRouteToHostException: No route to host

如果您在 namenode 系统上安装了防火墙，则会发生此错误。要禁用防火墙，请在终端中键入这些命令。

service iptables save
service iptables stop
chkconfig iptables off 

现在，停止并启动 hadoop 进程。