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: socketlisten...@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?
