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From Rico <asce...@163.com>
Subject Re: Failed to start TaskTracker server
Date Sat, 20 Dec 2008 05:58:17 GMT
Well the machines are all servers that probably running many services 
but I have no permission to change or modify other users' programs or 
settings. Is there any way to change 50060 to other port?

Sagar Naik wrote:
> Well u have some process which grabs this port and Hadoop is not able 
> to bind the port
> By the time u check, there is a chance that socket connection has died 
> but was occupied when hadoop processes was attempting
>
> Check all the processes running on the system
> Do any of the processes acquire ports ?
>
> -Sagar
> ascend1 wrote:
>> I have made a Hadoop platform on 15 machines recently. NameNode - 
>> DataNodes work properly but when I use bin/start-mapred.sh to start 
>> MapReduce framework only 3 or 4 TaskTracker could be started 
>> properly. All those couldn't be started have the same error.
>> Here's the log:
>>
>> 2008-12-19 16:16:31,951 INFO org.apache.hadoop.mapred.TaskTracker: 
>> STARTUP_MSG: 
>> /************************************************************
>> STARTUP_MSG: Starting TaskTracker
>> STARTUP_MSG: host = msra-5lcd05/172.23.213.80
>> STARTUP_MSG: args = []
>> STARTUP_MSG: version = 0.19.0
>> STARTUP_MSG: build = 
>> https://svn.apache.org/repos/asf/hadoop/core/branches/branch-0.19 -r 
>> 713890; compiled by 'ndaley' on Fri Nov 14 03:12:29 UTC 2008
>> ************************************************************/
>> 2008-12-19 16:16:33,248 INFO org.mortbay.http.HttpServer: Version 
>> Jetty/5.1.4
>> 2008-12-19 16:16:33,248 INFO org.mortbay.util.Credential: Checking 
>> Resource aliases
>> 2008-12-19 16:16:33,608 INFO org.mortbay.util.Container: Started 
>> org.mortbay.jetty.servlet.WebApplicationHandler@e51b2c
>> 2008-12-19 16:16:33,655 INFO org.mortbay.util.Container: Started 
>> WebApplicationContext[/static,/static]
>> 2008-12-19 16:16:33,811 INFO org.mortbay.util.Container: Started 
>> org.mortbay.jetty.servlet.WebApplicationHandler@edf389
>> 2008-12-19 16:16:33,936 INFO org.mortbay.util.Container: Started 
>> WebApplicationContext[/logs,/logs]
>> 2008-12-19 16:16:34,092 INFO org.mortbay.util.Container: Started 
>> org.mortbay.jetty.servlet.WebApplicationHandler@17b0998
>> 2008-12-19 16:16:34,092 INFO org.mortbay.util.Container: Started 
>> WebApplicationContext[/,/]
>> 2008-12-19 16:16:34,155 WARN org.mortbay.util.ThreadedServer: Failed 
>> to start: SocketListener0@0.0.0.0:50060
>> 2008-12-19 16:16:34,155 ERROR org.apache.hadoop.mapred.TaskTracker: 
>> Can not start task tracker because java.net.BindException: Address 
>> already in use: JVM_Bind
>> at java.net.PlainSocketImpl.socketBind(Native Method)
>> at java.net.PlainSocketImpl.bind(PlainSocketImpl.java:359)
>> at java.net.ServerSocket.bind(ServerSocket.java:319)
>> at java.net.ServerSocket.<init>(ServerSocket.java:185)
>> at 
>> org.mortbay.util.ThreadedServer.newServerSocket(ThreadedServer.java:391)
>> at org.mortbay.util.ThreadedServer.open(ThreadedServer.java:477)
>> at org.mortbay.util.ThreadedServer.start(ThreadedServer.java:503)
>> at org.mortbay.http.SocketListener.start(SocketListener.java:203)
>> at org.mortbay.http.HttpServer.doStart(HttpServer.java:761)
>> at org.mortbay.util.Container.start(Container.java:72)
>> at org.apache.hadoop.http.HttpServer.start(HttpServer.java:321)
>> at org.apache.hadoop.mapred.TaskTracker.<init>(TaskTracker.java:894)
>> at org.apache.hadoop.mapred.TaskTracker.main(TaskTracker.java:2698)
>> 2008-12-19 16:16:34,155 INFO org.apache.hadoop.mapred.TaskTracker: 
>> SHUTDOWN_MSG: 
>> /************************************************************
>> SHUTDOWN_MSG: Shutting down TaskTracker at msra-5lcd05/172.23.213.80
>> ************************************************************/
>>
>> Then I use "netstat -an", but port 50060 isn't in the list. "ps -af" 
>> also show that no program using 50060. The strange point is that when 
>> I repeat "bin/start-mapred.sh" and "bin/stop-mapred.sh" several 
>> times, the machines list that could start TaskTracker seems randomly.
>>
>> Could anybody help me solve this problem?
>
>



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