This is the error. By the way, how to I restart the NameNode via Ambari? 2017-11-23 15:06:45,385 INFO http.HttpServer2 (NameNodeHttpServer.java:initWebHdfs(93)) - Added filter 'or g.apache.hadoop.hdfs.web.AuthFilter' (class=org.apache.hadoop.hdfs.web.AuthFilter) 2017-11-23 15:06:45,388 INFO http.HttpServer2 (HttpServer2.java:addJerseyResourcePackage(690)) - addJersey ResourcePackage: packageName=org.apache.hadoop.hdfs.server.namenode.web.resources;org.apache.hadoop.hdfs.we b.resources, pathSpec=/webhdfs/v1/* 2017-11-23 15:06:45,454 INFO http.HttpServer2 (HttpServer2.java:start(940)) - HttpServer.start() threw a n on Bind IOException 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.mortbay.jetty.nio.SelectChannelConnector.open(SelectChannelConnector.java:216) at org.apache.hadoop.http.HttpServer2.bindListener(HttpServer2.java:988) at org.apache.hadoop.http.HttpServer2.bindForSinglePort(HttpServer2.java:1019) at org.apache.hadoop.http.HttpServer2.openListeners(HttpServer2.java:1080) at org.apache.hadoop.http.HttpServer2.start(HttpServer2.java:937) at org.apache.hadoop.hdfs.server.namenode.NameNodeHttpServer.start(NameNodeHttpServer.java:170) at org.apache.hadoop.hdfs.server.namenode.NameNode.startHttpServer(NameNode.java:933) at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:746) at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:992) at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:976) at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1701) at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1769) 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) ... 12 more 2017-11-23 15:06:45,464 INFO impl.MetricsSystemImpl (MetricsSystemImpl.java:stop(211)) - Stopping NameNode metrics system... 2017-11-23 15:06:45,464 INFO impl.MetricsSystemImpl (MetricsSystemImpl.java:stop(217)) - NameNode metrics system stopped. 2017-11-23 15:06:45,464 INFO impl.MetricsSystemImpl (MetricsSystemImpl.java:shutdown(606)) - NameNode metr ics system shutdown complete. 2017-11-23 15:06:45,465 ERROR namenode.NameNode (NameNode.java:main(1774)) - Failed to start namenode. 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.mortbay.jetty.nio.SelectChannelConnector.open(SelectChannelConnector.java:216) at org.apache.hadoop.http.HttpServer2.bindListener(HttpServer2.java:988) at org.apache.hadoop.http.HttpServer2.bindForSinglePort(HttpServer2.java:1019) at org.apache.hadoop.http.HttpServer2.openListeners(HttpServer2.java:1080) at org.apache.hadoop.http.HttpServer2.start(HttpServer2.java:937) at org.apache.hadoop.hdfs.server.namenode.NameNodeHttpServer.start(NameNodeHttpServer.java:170) at org.apache.hadoop.hdfs.server.namenode.NameNode.startHttpServer(NameNode.java:933) at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:746) at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:992) at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:976) at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1701) at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1769) 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) ... 12 more 2017-11-23 15:06:45,466 INFO util.ExitUtil (ExitUtil.java:terminate(124)) - Exiting with status 1 2017-11-23 15:06:45,498 INFO namenode.NameNode (LogAdapter.java:info(47)) - SHUTDOWN_MSG: /************************************************************ SHUTDOWN_MSG: Shutting down NameNode at sandbox.hortonworks.com/172.17.0.2 ************************************************************/ ... View more