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Harsh J commented on HDFS-2567: ------------------------------- But ideally, the sub functions should be aware of these things -- right now it counts down into negative given 0 nodes. Should that be fixed as a new JIRA? I could not make a change there cause they were unable to throw back exceptions yet, and the methods appeared public and could require lots of changes if I add in throws. > When 0 DNs are available, show a proper error when trying to browse DFS via > web UI > ---------------------------------------------------------------------------------- > > Key: HDFS-2567 > URL: https://issues.apache.org/jira/browse/HDFS-2567 > Project: Hadoop HDFS > Issue Type: Bug > Components: name-node > Affects Versions: 0.23.0 > Reporter: Harsh J > Fix For: 0.24.0 > > Attachments: HDFS-2567.patch, HDFS-2567.patch > > > Trace: > {code} > HTTP ERROR 500 > Problem accessing /nn_browsedfscontent.jsp. Reason: > n must be positive > Caused by: > java.lang.IllegalArgumentException: n must be positive > at java.util.Random.nextInt(Random.java:250) > at > org.apache.hadoop.net.NetworkTopology.chooseRandom(NetworkTopology.java:556) > at > org.apache.hadoop.net.NetworkTopology.chooseRandom(NetworkTopology.java:524) > at > org.apache.hadoop.hdfs.server.namenode.NamenodeJspHelper.getRandomDatanode(NamenodeJspHelper.java:372) > at > org.apache.hadoop.hdfs.server.namenode.NamenodeJspHelper.redirectToRandomDataNode(NamenodeJspHelper.java:383) > 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:98) > 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:940) > 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) > {code} > Steps I did to run into this: > 1. Start a new NN, freshly formatted. > 2. No DNs yet. > 3. Visit the DFS browser link > {{http://localhost:50070/nn_browsedfscontent.jsp}} > 4. Above error shows itself > 5. {{hdfs dfs -touchz afile}} > 6. Re-visit, still shows the same issue. > Perhaps its cause of no added DN so far. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira