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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-1176) Reduce hang on huge map output
Date Tue, 24 Apr 2007 20:41:15 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-1176?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Arun C Murthy updated HADOOP-1176:
----------------------------------

    Attachment: HADOOP-1176_20070425_5.patch

Updated to reflect changes to trunk...

> Reduce hang on huge map output
> ------------------------------
>
>                 Key: HADOOP-1176
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1176
>             Project: Hadoop
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.12.2
>            Reporter: Hairong Kuang
>         Assigned To: Arun C Murthy
>             Fix For: 0.13.0
>
>         Attachments: HADOOP-1176_20070405_1.patch, HADOOP-1176_20070406_2.patch, HADOOP-1176_20070411_3.patch,
HADOOP-1176_20070420_4.patch, HADOOP-1176_20070425_5.patch, jetty-exception.log
>
>
> I ran a job with one map and one reduce. The map succeeded, producing 3G output. The
reducer hang on fetching the map output. The log shows the following error message:
> WARN org.apache.hadoop.mapred.TaskTracker: getMapOutput(task_0401_m_000000_0,0) failed
:
> java.net.SocketException: Connection reset
>         at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:96)
>         at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
>         at org.mortbay.http.ChunkingOutputStream.bypassWrite(ChunkingOutputStream.java:151)
>         at org.mortbay.http.BufferedOutputStream.write(BufferedOutputStream.java:139)
>         at org.mortbay.http.HttpOutputStream.write(HttpOutputStream.java:423)
>         at org.mortbay.jetty.servlet.ServletOut.write(ServletOut.java:54)
>         at org.apache.hadoop.mapred.TaskTracker$MapOutputServlet.doGet(TaskTracker.java:1664)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
>         at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:427)
>         at org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:475)
>         at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:567)
>         at org.mortbay.http.HttpContext.handle(HttpContext.java:1565)
>         at org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:635)
>         at org.mortbay.http.HttpContext.handle(HttpContext.java:1517)
>         at org.mortbay.http.HttpServer.service(HttpServer.java:954)
>         at org.mortbay.http.HttpConnection.service(HttpConnection.java:814)
>         at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:981)
>         at org.mortbay.http.HttpConnection.handle(HttpConnection.java:831)
>         at org.mortbay.http.SocketListener.handleConnection(SocketListener.java:244)
>         at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:357)
>         at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:534)
> WARN /: /mapOutput?map=task_0401_m_000000_0&reduce=0:
> java.lang.IllegalStateException: Committed
>         at org.mortbay.jetty.servlet.ServletHttpResponse.resetBuffer(ServletHttpResponse.java:212)
>         at org.mortbay.jetty.servlet.ServletHttpResponse.sendError(ServletHttpResponse.java:375)
>         at org.apache.hadoop.mapred.TaskTracker$MapOutputServlet.doGet(TaskTracker.java:1694)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
>         at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:427)
>         at org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:475)
>         at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:567)
>         at org.mortbay.http.HttpContext.handle(HttpContext.java:1565)
>         at org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:635)
>         at org.mortbay.http.HttpContext.handle(HttpContext.java:1517)
>         at org.mortbay.http.HttpServer.service(HttpServer.java:954)
>         at org.mortbay.http.HttpConnection.service(HttpConnection.java:814)
>         at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:981)
>         at org.mortbay.http.HttpConnection.handle(HttpConnection.java:831)
>         at org.mortbay.http.SocketListener.handleConnection(SocketListener.java:244)
>         at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:357)
>         at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:534)

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