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
Fix For: 0.13.0
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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