java jsp hdfs_HDFS HTTP访问报错

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#java jsp hdfs

在尝试访问HDFS资源时遇到了HTTP 500错误，问题源于NameNode处于安全模式。系统报告的块数量为0，需要额外的10个块来达到0.9990的阈值，总共有10个块。要解决这个问题，需要在30秒内重启并执行'hadoop dfsadmin -safemode leave'命令退出安全模式。

HTTP ERROR 500

Problem accessing /nn_browsedfscontent.jsp. Reason:

Cannot issue delegation token. Name node is in safe mode.

The reported blocks 0 needs additional 10 blocks to reach the threshold 0.9990 of total blocks 10.

Safe mode will be turned off automatically

Caused by:

org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot issue delegation token. Name node is in safe mode.

The reported blocks 0 needs additional 10 blocks to reach the threshold 0.9990 of total blocks 10.

Safe mode will be turned off automatically

at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getDelegationToken(FSNamesystem.java:5887)

at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.getDelegationToken(NameNodeRpcServer.java:447)

at org.apache.hadoop.hdfs.server.namenode.NamenodeJspHelper$1.run(NamenodeJspHelper.java:623)

at org.apache.hadoop.hdfs.server.namenode.NamenodeJspHelper$1.run(NamenodeJspHelper.java:620)

at java.security.AccessController.doPrivileged(Native Method)

at javax.security.auth.Subject.doAs(Subject.java:415)

at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1491)

at org.apache.hadoop.hdfs.server.namenode.NamenodeJspHelper.getDelegationToken(NamenodeJspHelper.java:619)

at org.apache.hadoop.hdfs.server.namenode.NamenodeJspHelper.redirectToRandomDataNode(NamenodeJspHelper.java:651)

at org.apache.hadoop.hdfs.server.namenode.nn_005fbrowsedfscontent_jsp._jspService(nn_005fbrowsedfscontent_jsp.java:70)

at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:9

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.lib.StaticUserWebFilter$StaticUserFilter.doFilter(StaticUserWebFilter.java:109)

at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)

at org.apache.hadoop.http.HttpServer$QuotingInputFilter.doFilter(HttpServer.java:1081)

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:92

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)

解决办法：

重启30秒内，nn处于安全模式，执行命令hadoop dfsadmin -safemode leave