secondarynamenode异常

No route to host  at java.net.PlainSocketImpl.socketConnect(Native Method)  at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)  at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)  at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)  at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)  at java.net.Socket.connect(Socket.java:529)  at sun.net.NetworkClient.doConnect(NetworkClient.java:158)  at sun.net.www.http.HttpClient.openServer(HttpClient.java:411)  at sun.net.www.http.HttpClient.openServer(HttpClient.java:525)  at sun.net.www.http.HttpClient.<init>(HttpClient.java:208)  at sun.net.www.http.HttpClient.New(HttpClient.java:291)  at sun.net.www.http.HttpClient.New(HttpClient.java:310)  at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:987)  at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:923)  at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:841)  at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1195)  at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:379)  at org.apache.hadoop.hdfs.server.namenode.TransferFsImage.doGetUrl(TransferFsImage.java:267)  at org.apache.hadoop.hdfs.server.namenode.TransferFsImage.getFileClient(TransferFsImage.java:246)  at org.apache.hadoop.hdfs.server.namenode.TransferFsImage.downloadImageToStorage(TransferFsImage.java:87)  at org.apache.hadoop.hdfs.server.namenode.GetImageServlet$1.run(GetImageServlet.java:164)  at org.apache.hadoop.hdfs.server.namenode.GetImageServlet$1.run(GetImageServlet.java:115)  at java.security.AccessController.doPrivileged(Native Method)  at javax.security.auth.Subject.doAs(Subject.java:396)  at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1542)  at org.apache.hadoop.hdfs.server.namenode.GetImageServlet.doGet(GetImageServlet.java:115)  at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)  at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)  at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)  at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1221)  at org.apache.hadoop.http.HttpServer$QuotingInputFilter.doFilter(HttpServer.java:1068)  at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)  at org.apache.hadoop.http.NoCacheFilter.doFilter(NoCacheFilter.java:45)  at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)  at org.apache.hadoop.http.NoCacheFilter.doFilter(NoCacheFilter.java:45)  at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)  at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:399)  at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)  at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)  at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)  at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450)  at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)  at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)  at org.mortbay.jetty.Server.handle(Server.java:326)  at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)  at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:928)  at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549)  at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)  at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)  at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)  at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
        at org.apache.hadoop.hdfs.server.namenode.TransferFsImage.doGetUrl(TransferFsImage.java:268)
        at org.apache.hadoop.hdfs.server.namenode.TransferFsImage.getFileClient(TransferFsImage.java:246)
        at org.apache.hadoop.hdfs.server.namenode.TransferFsImage.uploadImageFromStorage(TransferFsImage.java:161)
        at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.doCheckpoint(SecondaryNameNode.java:523)
        at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.doWork(SecondaryNameNode.java:355)
        at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode$2.run(SecondaryNameNode.java:321)
        at org.apache.hadoop.security.SecurityUtil.doAsLoginUserOrFatal(SecurityUtil.java:452)
        at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.run(SecondaryNameNode.java:317)
        at java.lang.Thread.run(Thread.java:662)

No route to host

这个问题可能是防火墙问题造成，service iptables stop
然后就可以用了

[@rsync.slave001.novel.hadoop.djt.sogou-op.org ~]# service iptables status
Table: filter
Chain INPUT (policy ACCEPT)
num target prot opt source destination

Chain FORWARD (policy ACCEPT)
num target prot opt source destination

Chain OUTPUT (policy ACCEPT)
num target prot opt source destination

[root@rsync ~]# service iptables status
iptables: Firewall is not running.
[root@rsync ~]#