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From "Amar Kamat (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4933) ConcurrentModificationException in JobHistory.java
Date Tue, 23 Dec 2008 06:47:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4933?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12658777#action_12658777
] 

Amar Kamat commented on HADOOP-4933:
------------------------------------

One more. This was while trying to analyse a running job.
{noformat}
org.apache.hadoop.fs.ChecksumException: Checksum error: file:job-file at offset
	at org.apache.hadoop.fs.ChecksumFileSystem$ChecksumFSInputChecker.readChunk(ChecksumFileSystem.java:219)
	at org.apache.hadoop.fs.FSInputChecker.readChecksumChunk(FSInputChecker.java:237)
	at org.apache.hadoop.fs.FSInputChecker.read1(FSInputChecker.java:189)
	at org.apache.hadoop.fs.FSInputChecker.read(FSInputChecker.java:158)
	at java.io.DataInputStream.read(DataInputStream.java:132)
	at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:264)
	at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:306)
	at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:158)
	at java.io.InputStreamReader.read(InputStreamReader.java:167)
	at java.io.BufferedReader.fill(BufferedReader.java:136)
	at java.io.BufferedReader.readLine(BufferedReader.java:299)
	at java.io.BufferedReader.readLine(BufferedReader.java:362)
	at org.apache.hadoop.mapred.JobHistory.parseHistoryFromFS(JobHistory.java:277)
	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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