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  • java.net.NoRouteToHostException: No route to host

    centos7环境下,启动hadoop集群时,在master节点启动集群,发现master节点的NameNode、SecondaryNameNode、JobTracker全部启动了,但是所有的slaver节点的DataNode、TaskTracker没有启动,查看某台slaver节点logs/hadoop-root-datanode-*-.log出现如下异常:

    2018-06-10 01:39:42,032 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: java.io.IOException: Call to centos7-01/192.168.146.135:9000 failed on local exception: java.net.NoRouteToHostException: No route to host
        at org.apache.hadoop.ipc.Client.wrapException(Client.java:775)
        at org.apache.hadoop.ipc.Client.call(Client.java:743)
        at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:220)
        at com.sun.proxy.$Proxy3.getProtocolVersion(Unknown Source)
        at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:359)
        at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:346)
        at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:383)
        at org.apache.hadoop.ipc.RPC.waitForProxy(RPC.java:314)
        at org.apache.hadoop.ipc.RPC.waitForProxy(RPC.java:291)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.startDataNode(DataNode.java:269)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.<init>(DataNode.java:216)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:1283)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1238)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:1246)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.main(DataNode.java:1368)
    Caused by: java.net.NoRouteToHostException: No route to host
        at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
        at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
        at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)
        at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:404)
        at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:304)
        at org.apache.hadoop.ipc.Client$Connection.access$1700(Client.java:176)
        at org.apache.hadoop.ipc.Client.getConnection(Client.java:860)
        at org.apache.hadoop.ipc.Client.call(Client.java:720)
        ... 13 more

    其原因是master无法穿透slaver的防火墙,只需要关闭所有主机的防火墙即可。

    systemctl  stop  firewalld
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  • 原文地址:https://www.cnblogs.com/wwzyy/p/9163692.html
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