2021-10-07

在搭建Yarn的时候，一台的NodeManager可以启动，但是ResourceManager却一直无法启动，查看日志发现，报出一下错误

2021-10-07 15:06:04,752 INFO org.apache.hadoop.ha.ActiveStandbyElector: Yielding from election
2021-10-07 15:06:04,775 INFO org.apache.zookeeper.ZooKeeper: Session: 0x37c59793a680003 closed
2021-10-07 15:06:04,775 INFO org.apache.hadoop.yarn.server.resourcemanager.ResourceManager: Already in standby state
2021-10-07 15:06:04,775 FATAL org.apache.hadoop.yarn.server.resourcemanager.ResourceManager: Error starting ResourceManager
org.apache.hadoop.yarn.webapp.WebAppException: Error starting http server
	at org.apache.hadoop.yarn.webapp.WebApps$Builder.start(WebApps.java:443)
	at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.startWepApp(ResourceManager.java:1197)
	at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.serviceStart(ResourceManager.java:1306)
	at org.apache.hadoop.service.AbstractService.start(AbstractService.java:194)
	at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.main(ResourceManager.java:1501)
Caused by: java.net.SocketException: Unresolved address
	at sun.nio.ch.Net.translateToSocketException(Net.java:131)
	at sun.nio.ch.Net.translateException(Net.java:157)
	at sun.nio.ch.Net.translateException(Net.java:163)
	at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:76)
	at org.eclipse.jetty.server.ServerConnector.openAcceptChannel(ServerConnector.java:351)
	at org.eclipse.jetty.server.ServerConnector.open(ServerConnector.java:319)
	at org.apache.hadoop.http.HttpServer2.bindListener(HttpServer2.java:1185)
	at org.apache.hadoop.http.HttpServer2.bindForSinglePort(HttpServer2.java:1216)
	at org.apache.hadoop.http.HttpServer2.openListeners(HttpServer2.java:1279)
	at org.apache.hadoop.http.HttpServer2.start(HttpServer2.java:1134)
	at org.apache.hadoop.yarn.webapp.WebApps$Builder.start(WebApps.java:439)
	... 4 more
Caused by: java.nio.channels.UnresolvedAddressException
	at sun.nio.ch.Net.checkAddress(Net.java:101)
	at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:218)
	at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
	... 11 more
2021-10-07 15:06:04,776 INFO org.apache.zookeeper.ClientCnxn: EventThread shut down for session: 0x37c59793a680003
2021-10-07 15:06:04,779 INFO org.apache.hadoop.yarn.server.resourcemanager.ResourceManager: SHUTDOWN_MSG: 

主要的信息点在这里，

后来找了很长时间，发现是配置yarn-site.xml 文件的时候有一个变量写错了。

这里的node4写成了ndoe，所有一直报错，节点无法正常启动，改正以后，ResourceManager就可以正常启动了。