I'll find and have a test. Thanks for your help!
On 2008-12-20，"Sagar Naik" <[email protected]> wrote：
> - check hadoop-default.xml
>in here u will find all the ports used. Copy the xml-nodes from
>hadoop-default.xml to hadoop-site.xml. Change the port values in
>hadoop-site.xml
>and deploy it on datanodes .
>
>
>Rico wrote:
>> 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.webapplicationhand...@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.webapplicationhand...@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.webapplicationhand...@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: [email protected]: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?
>>>
>>>
>>
>>
>
