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Kousuke Saruta commented on MAPREDUCE-5600: ------------------------------------------- Hi Benoit, Can you reproduce that? > ConcurrentModificationException on /tasktracker.jsp > --------------------------------------------------- > > Key: MAPREDUCE-5600 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-5600 > Project: Hadoop Map/Reduce > Issue Type: Bug > Components: tasktracker > 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). > Reporter: Benoit Sigoure > > If you request {{/tasktracker.jsp}} frequently on a TaskTracker that's busy, > every once in a while you'll get this: > {code} > 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) > {code} -- This message was sent by Atlassian JIRA (v6.1#6144)