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From "#YONG YONG CHENG#" <aarnc...@pmail.ntu.edu.sg>
Subject Re: TaskTracker Unable To Run Task
Date Tue, 06 Oct 2009 01:51:55 GMT
Good Day,
This is what I do to solve the problem below.
I used cygserver to start the tasktracker, instead using the Java Wrapper Service. And now
my cluster can work correctly.
In your cygwin bash window, you can try this command:
cygrunsrv --install "Hadoop TaskTracker" -p /usr/local/hadoop/bin/hadoop -a tasktracker -c
/usr/local/hadoop -t auto -u <your username> -n -O -y "Hadoop DataNode" 
Although I know that my solution does not actually solve the problem listed below, it may
be a temporary solution for now. I welcome any appropriate solution when it appears.
As there are a lot of unused Windows-based computer during weekends and holidays, the Hadoop
cluster is mostly made up of Windows-based nodes. As Hadoop is a Java platform, it has a higher
chance of having many different configurations of computers (Windows-based/Linux-based/others)
linked to form a (possibly free) cluster and thus truly cross-platform.
So to the Hadoop community, please do not give up on making Hadoop being truly cross-platform.
I am currently writing a Web Service for the Hadoop cluster in my University to be accessed
over the Internet, thus currently busy with my project. If possible after my project, I hope
that I can contribute to make Hadoop truly cross-platform.
Good Day,

I have managed to run my hadoop cluster (3-nodes, TT/JT and NN/DN) currently by using Windows
Service via Java Wrapper Service. But my tasktracker seems unable to run any task.

I thought the spawn jvm will inherit the classpath of the parent jvm, even starting using
Windows. Is Windows the cause? If it is the cause, is there any other way that I can do via
configuration to solve this problem?

Below is the logs

Log By One Of The Map Task Attempt (attempt_200909071902_0006_m_000004_3)

java.lang.NoClassDefFoundError: org/apache/hadoop/mapred/Child Caused by: java.lang.ClassNotFoundException:
org.apache.hadoop.mapred.Child at java.net.URLClassLoader$1.run(URLClassLoader.java:200) at
java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
Exception in thread "main" 

Log In The TaskTracker (for the above attempt)

2009-09-07 19:21:42,181 INFO org.apache.hadoop.mapred.TaskTracker: addFreeSlot : current free
slots : 2
2009-09-07 19:21:42,181 INFO org.apache.hadoop.mapred.TaskTracker: LaunchTaskAction (registerTask):
attempt_200909071902_0006_m_000004_3 task's state:UNASSIGNED
2009-09-07 19:21:42,181 INFO org.apache.hadoop.mapred.TaskTracker: Trying to launch : attempt_200909071902_0006_m_000004_3
2009-09-07 19:21:42,181 INFO org.apache.hadoop.mapred.TaskTracker: In TaskLauncher, current
free slots : 2 and trying to launch attempt_200909071902_0006_m_000004_3
2009-09-07 19:21:42,243 INFO org.apache.hadoop.mapred.JvmManager: In JvmRunner constructed
JVM ID: jvm_200909071902_0006_m_1046393994
2009-09-07 19:21:42,243 INFO org.apache.hadoop.mapred.JvmManager: JVM Runner jvm_200909071902_0006_m_1046393994
2009-09-07 19:21:42,743 WARN org.apache.hadoop.mapred.TaskRunner: attempt_200909071902_0006_m_000004_3
Child Error
java.io.IOException: Task process exit with nonzero status of 1.
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:425)
2009-09-07 19:21:42,743 INFO org.apache.hadoop.mapred.JvmManager: JVM : jvm_200909071902_0006_m_1046393994
exited. Number of tasks it ran: 0
2009-09-07 19:21:45,743 INFO org.apache.hadoop.mapred.TaskRunner: attempt_200909071902_0006_m_000004_3
done; removing files.

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