Hadoop Common
  1. Hadoop Common
  2. HADOOP-1179

task Tracker should be restarted if its jetty http server cannot serve get-map-output files

    Details

    • Type: Bug Bug
    • Status: Closed
    • Priority: Major Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 0.12.3
    • Component/s: None
    • Labels:
      None

      Description

      Due to some errors (mem leak?), the jetty http server throws outOfMemory exception when serving get-map-output requests:

      2007-03-28 20:42:39,608 WARN org.mortbay.jetty.servlet.ServletHandler: Error for
      /mapOutput?map=task_0334_m_013127_0&reduce=591
      2007-03-28 20:46:42,788 WARN org.mortbay.jetty.servlet.ServletHandler: Error for
      /mapOutput?map=task_0334_m_013127_0&reduce=591
      2007-03-28 20:49:38,064 WARN org.mortbay.jetty.servlet.ServletHandler: Error for
      java.lang.OutOfMemoryError
      at java.io.FileInputStream.readBytes(Native Method)
      at java.io.FileInputStream.read(FileInputStream.java:199)
      at org.apache.hadoop.fs.RawLocalFileSystem$LocalFSFileInputStream.read(R
      awLocalFileSystem.java:119)
      at org.apache.hadoop.fs.FSDataInputStream$PositionCache.read(FSDataInput
      Stream.java:41)
      at java.io.BufferedInputStream.read1(BufferedInputStream.java:256)
      at java.io.BufferedInputStream.read(BufferedInputStream.java:317)
      at java.io.DataInputStream.read(DataInputStream.java:132)
      at org.apache.hadoop.fs.ChecksumFileSystem$FSInputChecker.readBuffer(Che
      cksumFileSystem.java:182)
      at org.apache.hadoop.fs.ChecksumFileSystem$FSInputChecker.read(ChecksumF
      ileSystem.java:167)
      at org.apache.hadoop.fs.FSDataInputStream$PositionCache.read(FSDataInput
      Stream.java:41)
      at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
      at java.io.BufferedInputStream.read1(BufferedInputStream.java:258)
      at java.io.BufferedInputStream.read(BufferedInputStream.java:317)
      at java.io.DataInputStream.readFully(DataInputStream.java:178)
      at java.io.DataInputStream.readLong(DataInputStream.java:399)
      at org.apache.hadoop.mapred.TaskTracker$MapOutputServlet.doGet(TaskTrack
      er.java:1643)
      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(WebApplicati
      onHandler.java:475)
      at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:5
      67)
      at org.mortbay.http.HttpContext.handle(HttpContext.java:1565)
      at org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplication
      Context.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)

      In this case, the task tracker cannot send out the map outut files on that machine, rendering it useless.
      Moreover, all the reduces depending on those map output files are just stuck there.
      If the task tracker reports fail to the job tracker, the map/reduce job can recover.
      If the task tracker restarted, it can continue to join the cluster as a new mamber.

      1. 1179.patch
        3 kB
        Devaraj Das

        Activity

        No work has yet been logged on this issue.

          People

          • Assignee:
            Devaraj Das
            Reporter:
            Runping Qi
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            Dates

            • Created:
              Updated:
              Resolved:

              Development