最近巡检发现生产环境hadoop的namenode日志一直报错，具体代码如下：
2012-08-21 09:20:24,486 WARN org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Cannot roll edit log, edits.new files already exists in all healthy directories:
/data/work/hdfs/name/current/edits.new
/backup/current/edits.new
2012-08-21 09:20:25,357 ERROR org.apache.hadoop.security.UserGroupInformation: PriviledgedActionException as:hadoop cause:java.net.ConnectException: Connection refused
2012-08-21 09:20:25,357 ERROR org.apache.hadoop.security.UserGroupInformation: PriviledgedActionException as:hadoop cause:java.net.ConnectException: Connection refused
2012-08-21 09:20:25,359 WARN org.mortbay.log: /getimage: java.io.IOException: GetImage failed. java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:193)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:519)
at java.net.Socket.connect(Socket.java:469)
at sun.net.NetworkClient.doConnect(NetworkClient.java:163)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:394)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:529)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:233)
at sun.net.www.http.HttpClient.New(HttpClient.java:306)
at sun.net.www.http.HttpClient.New(HttpClient.java:323)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:852)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:793)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:718)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1041)
at org.apache.hadoop.hdfs.server.namenode.TransferFsImage.getFileClient(TransferFsImage.java:160)
at org.apache.hadoop.hdfs.server.namenode.GetImageServlet$1$1.run(GetImageServlet.java:88)
at org.apache.hadoop.hdfs.server.namenode.GetImageServlet$1$1.run(GetImageServlet.java:85)
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:1121)
at org.apache.hadoop.hdfs.server.namenode.GetImageServlet$1.run(GetImageServlet.java:85)
at org.apache.hadoop.hdfs.server.namenode.GetImageServlet$1.run(GetImageServlet.java:70)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1121)
at org.apache.hadoop.hdfs.server.namenode.GetImageServlet.doGet(GetImageServlet.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1221)
at org.apache.hadoop.http.HttpServer$QuotingInputFilter.doFilter(HttpServer.java:835)
at org.mortbay.jetty.servlet.ServletHandler$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)
网上找了一番，提示了secondarynamenode和namenode获取image出了问题，但是网上的文章说是secondarynamenode根本就无法获取image，但是我的生产环境secondarynamenode是可以从namenode获取日志和映像的，因为我secondarynamenode的hdfs-site.xml文件中配置了namenode的主机名，所以能获取，反而就是日志中一直报错，但是不影响hdfs的使用。按照网上的办法的解决步骤如下：
1、停止hbase、zookeeper、hadoop
2、修改namenode的hdfs-site.xml文件中的内容：
将上述的0.0.0.0修改为你部署secondarynamenode的主机名就OK了！
3、同步到所有的节点中，记得部署secondarynamenode节点的hdfs-site.xml文件不要完全覆盖了，因为配置不一样。
4、启动hadoop、zookeeper、hbase。
再查看hadoop的namenode日志相关的报错已经没有了。