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  1. Hadoop Map/Reduce
  2. MAPREDUCE-5600

ConcurrentModificationException on /tasktracker.jsp

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    Details

    • Type: Bug
    • Status: Open
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: tasktracker
    • Labels:
      None
    • Environment:

      Found this in the MR1 bundled with hadoop-2.0.0-mr1-cdh4.1.3 (which I think is based on some 0.20 version).

      Description

      If you request /tasktracker.jsp frequently on a TaskTracker that's busy, every once in a while you'll get this:

      2013-10-29 13:25:55,524 ERROR org.mortbay.log: /tasktracker.jsp
      java.util.ConcurrentModificationException
              at java.util.TreeMap$PrivateEntryIterator.nextEntry(TreeMap.java:1117)
              at java.util.TreeMap$EntryIterator.next(TreeMap.java:1153)
              at java.util.TreeMap$EntryIterator.next(TreeMap.java:1148)
              at org.apache.hadoop.mapred.TaskTracker.getTasksFromRunningJobs(TaskTracker.java:3991)
              at org.apache.hadoop.mapred.tasktracker_jsp._jspService(tasktracker_jsp.java:98)
              at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
              at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
              at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
              at org.mortbay.jetty.servlet.ServletHandler$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$QuotingInputFilter.doFilter(HttpServer.java:1056)
              at org.mortbay.jetty.servlet.ServletHandler$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)
      

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            • Assignee:
              Unassigned
              Reporter:
              tsuna Benoit Sigoure

              Dates

              • Created:
                Updated:

                Issue deployment