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From "Nigel Daley (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-1011) ConcurrentModificationException in JobHistory
Date Mon, 12 Feb 2007 22:07:05 GMT
ConcurrentModificationException in JobHistory
---------------------------------------------

                 Key: HADOOP-1011
                 URL: https://issues.apache.org/jira/browse/HADOOP-1011
             Project: Hadoop
          Issue Type: Bug
          Components: mapred
    Affects Versions: 0.11.1
            Reporter: Nigel Daley


Using the jobtracker web ui to look at job history.  Loading multiple history URLs concurrently
in differnt browser windows yielded this exception in the jobtracker log:

2007-02-12 21:49:00,574 WARN /: /taskdetailshistory.jsp?jobid=job_0001&jobTrackerId=1171157609392&taskid=tip_0001_m_002660:
java.util.ConcurrentModificationException
        at java.util.HashMap$HashIterator.nextEntry(HashMap.java:787)
        at java.util.HashMap$EntryIterator.next(HashMap.java:829)
        at java.util.HashMap$EntryIterator.next(HashMap.java:827)
        at java.util.HashMap.putAll(HashMap.java:515)
        at org.apache.hadoop.mapred.JobHistory$KeyValuePair.set(JobHistory.java:263)
        at org.apache.hadoop.mapred.JobHistory$KeyValuePair.handle(JobHistory.java:270)
        at org.apache.hadoop.mapred.DefaultJobHistoryParser$JobTasksParseListener.handle(DefaultJobHistoryParser.java:98)
        at org.apache.hadoop.mapred.JobHistory.parseLine(JobHistory.java:150)
        at org.apache.hadoop.mapred.JobHistory.parseHistory(JobHistory.java:125)
        at org.apache.hadoop.mapred.DefaultJobHistoryParser.parseJobTasks(DefaultJobHistoryParser.java:38)
        at org.apache.hadoop.mapred.loadhistory_jsp._jspService(loadhistory_jsp.java:83)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:427)
        at org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:475)
        at org.mortbay.jetty.servlet.Dispatcher.dispatch(Dispatcher.java:275)
        at org.mortbay.jetty.servlet.Dispatcher.include(Dispatcher.java:161)
        at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:966)
        at org.apache.hadoop.mapred.taskdetailshistory_jsp._jspService(taskdetailshistory_jsp.java:73)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:427)
        at org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:475)
        at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:567)
        at org.mortbay.http.HttpContext.handle(HttpContext.java:1565)
        at org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:635)
        at org.mortbay.http.HttpContext.handle(HttpContext.java:1517)
        at org.mortbay.http.HttpServer.service(HttpServer.java:954)
        at org.mortbay.http.HttpConnection.service(HttpConnection.java:814)
        at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:981)
        at org.mortbay.http.HttpConnection.handle(HttpConnection.java:831)
        at org.mortbay.http.SocketListener.handleConnection(SocketListener.java:244)
        at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:357)
        at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:534)


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