hadoop无法启动datanode

错误： at org.apache.hadoop.hdfs.server.datanode.DataNode.main(DataNode.java:1812)

Caused by: java.net.NoRouteToHostException: 没有到主机的路由

错误： ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: java.io.IOException: Shutting down. Incompatible version or revision.DataNode version '1.2.1' and revision '1503

152' and NameNode version '1.2.1' and revision ' and hadoop.relaxed.worker.version.check is not enabled and hadoop.skip.worker.version.check is not enabled

1、检查防火墙：service firewalld stop  关闭防火墙

2、

在core-site.xml中添加

<property>

        <name>hadoop.relaxed.worker.version.check</name>

        <value>true</value>

     </property>

     <property>

         <name>hadoop.skip.worker.version.check</name>

         <value>true</value>
     </property>

记得同步到其他的slave去！！