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https://issues.apache.org/jira/browse/MAPREDUCE-1308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12791978#action_12791978
]
Brian Karlak commented on MAPREDUCE-1308:
-----------------------------------------
And in the tasktracker logs, around the same time but for a different task, I
get errors like the one below. There are about 55 of these over a 24-hour
period.
2009-12-17 03:56:14,843 WARN org.apache.hadoop.mapred.TaskTracker:
getMapOutput(attempt_200912102211_1648_m_000082_0,46) 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$MapOutputServlet.doGet(TaskTracker.java:2919)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:427)
at
org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:475)
at
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:567)
at org.mortbay.http.HttpContext.handle(HttpContext.java:1565)
at
org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:635)
at org.mortbay.http.HttpContext.handle(HttpContext.java:1517)
at org.mortbay.http.HttpServer.service(HttpServer.java:954)
at org.mortbay.http.HttpConnection.service(HttpConnection.java:814)
at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:981)
at org.mortbay.http.HttpConnection.handle(HttpConnection.java:831)
at
org.mortbay.http.SocketListener.handleConnection(SocketListener.java:244)
at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:357)
at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:534)
2009-12-17 03:56:14,844 INFO org.apache.hadoop.mapred.TaskTracker.clienttrace:
src: 172.29.2.67:50060, dest: 172.29.2.61:17116, bytes: 589824, op:
MAPRED_SHUFFLE, cliID: attempt_200912102211_1648_m_000082_0
2009-12-17 03:56:14,844 WARN /:
/mapOutput?job=job_200912102211_1648&map=attempt_200912102211_1648_m_000082_0&reduce=46:
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$MapOutputServlet.doGet(TaskTracker.java:2945)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:427)
at
org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:475)
at
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:567)
at org.mortbay.http.HttpContext.handle(HttpContext.java:1565)
at
org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:635)
at org.mortbay.http.HttpContext.handle(HttpContext.java:1517)
at org.mortbay.http.HttpServer.service(HttpServer.java:954)
at org.mortbay.http.HttpConnection.service(HttpConnection.java:814)
at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:981)
at org.mortbay.http.HttpConnection.handle(HttpConnection.java:831)
at
org.mortbay.http.SocketListener.handleConnection(SocketListener.java:244)
at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:357)
at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:534)
> reduce tasks stall and are eventually killed
> --------------------------------------------
>
> Key: MAPREDUCE-1308
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1308
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: tasktracker
> Environment: 20-node cluster, 8 cores per machine, 32GB memory,
> Fedora Linux
> Reporter: Brian Karlak
>
> We recently migrated our 0.19.2 cluster from Gentoo Linux to Fedora Linux.
> Everything was running smoothly before, but now about 5%-10% of our jobs have
> at least one reduce task that stalls out and is eventually killed with the
> message:
> Task attempt_200912102211_1648_r_000009_0 failed to report status for
> 6003 seconds. Killing!
> The task is then re-launched and completes successfully, usually in a couple
> of minutes.
> This is problematic because our scheduled Hadoop jobs now take an extra
> hour-and-a-half to run (6000 seconds).
> There are no indications in the logs that anything is amiss. The task
> starts, a small amount of the copy/shuffle runs, and then nothing is else is
> heard from the task until it is killed. I will attach the relevant parts of
> the TaskTracker logs in the comments.
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