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https://issues.apache.org/jira/browse/HADOOP-4933?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12658799#action_12658799
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Amar Kamat commented on HADOOP-4933:
------------------------------------
One more. Note that these errors are seen when I try to parse history files in
parallel.
{noformat}
java.lang.NullPointerException
at java.util.TreeMap.getEntry(TreeMap.java:324)
at java.util.TreeMap.get(TreeMap.java:255)
at
org.apache.hadoop.mapred.DefaultJobHistoryParser$JobTasksParseListener.getTask(DefaultJobHistoryParser.java:67)
at
org.apache.hadoop.mapred.DefaultJobHistoryParser$JobTasksParseListener.getMapAttempt(DefaultJobHistoryParser.java:79)
at
org.apache.hadoop.mapred.DefaultJobHistoryParser$JobTasksParseListener.handle(DefaultJobHistoryParser.java:119)
at org.apache.hadoop.mapred.JobHistory.parseLine(JobHistory.java:309)
at org.apache.hadoop.mapred.JobHistory.parseHistoryFromFS(JobHistory.java:275)
at
org.apache.hadoop.mapred.DefaultJobHistoryParser.parseJobTasks(DefaultJobHistoryParser.java:50)
at org.apache.hadoop.mapred.loadhistory_jsp._jspService(loadhistory_jsp.java:86)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:502)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:363)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:417)
at org.mortbay.jetty.servlet.Dispatcher.include(Dispatcher.java:192)
at
org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:966)
at
org.apache.hadoop.mapred.jobdetailshistory_jsp._jspService(jobdetailshistory_jsp.java:54)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:502)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:363)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:417)
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:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:534)
at
org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:864)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:533)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:207)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:403)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:522)
{noformat}
> ConcurrentModificationException in JobHistory.java
> --------------------------------------------------
>
> Key: HADOOP-4933
> URL: https://issues.apache.org/jira/browse/HADOOP-4933
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Reporter: Amar Kamat
> Priority: Critical
>
> {{JobHistory.java}} throws {{ConcurrentModificationException}} while finding
> out the job history version.
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