When run as a java application, the trace:
09/05/08 10:08:49 WARN fs.FileSystem: uri=file:///
javax.security.auth.login.LoginException: Login failed: Cannot run program
"whoami": CreateProcess error=2, ¨t²??¨ì«ü©
at
org.apache.hadoop.security.UnixUserGroupInformation.login(UnixUserGroupInformation.java:250)
at
org.apache.hadoop.security.UnixUserGroupInformation.login(UnixUserGroupInformation.java:275)
at
org.apache.hadoop.security.UnixUserGroupInformation.login(UnixUserGroupInformation.java:257)
at
org.apache.hadoop.security.UserGroupInformation.login(UserGroupInformation.java:67)
at
org.apache.hadoop.fs.FileSystem$Cache$Key.<init>(FileSystem.java:1410)
at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1348)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:213)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:118)
at
org.apache.hadoop.mapred.JobConf.getWorkingDirectory(JobConf.java:354)
at
org.apache.hadoop.mapred.FileInputFormat.setInputPaths(FileInputFormat.java:377)
at mapreduce.WordCount.main(WordCount.java:44)
09/05/08 10:08:49 WARN fs.FileSystem: uri=file:///
javax.security.auth.login.LoginException: Login failed: Cannot run program
"whoami": CreateProcess error=2, ¨t²??¨ì«ü©
at
org.apache.hadoop.security.UnixUserGroupInformation.login(UnixUserGroupInformation.java:250)
at
org.apache.hadoop.security.UnixUserGroupInformation.login(UnixUserGroupInformation.java:275)
at
org.apache.hadoop.security.UnixUserGroupInformation.login(UnixUserGroupInformation.java:257)
at
org.apache.hadoop.security.UserGroupInformation.login(UserGroupInformation.java:67)
at
org.apache.hadoop.fs.FileSystem$Cache$Key.<init>(FileSystem.java:1410)
at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1348)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:213)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:118)
at
org.apache.hadoop.mapred.LocalJobRunner.<init>(LocalJobRunner.java:311)
at org.apache.hadoop.mapred.JobClient.init(JobClient.java:390)
at org.apache.hadoop.mapred.JobClient.<init>(JobClient.java:361)
at org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:1011)
at mapreduce.WordCount.main(WordCount.java:46)
09/05/08 10:08:49 INFO jvm.JvmMetrics: Initializing JVM Metrics with
processName=JobTracker, sessionId=
Problem
09/05/08 10:08:50 WARN mapred.JobClient: Use GenericOptionsParser for
parsing the arguments. Applications should implement Tool for the same.
java.io.IOException: Failed to get the current user's information.
at
org.apache.hadoop.mapred.JobClient.configureCommandLineOptions(JobClient.java:559)
at org.apache.hadoop.mapred.JobClient.submitJob(JobClient.java:729)
at org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:1026)
at mapreduce.WordCount.main(WordCount.java:46)
Caused by: javax.security.auth.login.LoginException: Login failed: Cannot
run program "whoami": CreateProcess error=2, ¨t²??¨ì«ü©
at
org.apache.hadoop.security.UnixUserGroupInformation.login(UnixUserGroupInformation.java:250)
at
org.apache.hadoop.security.UnixUserGroupInformation.login(UnixUserGroupInformation.java:275)
at
org.apache.hadoop.mapred.JobClient.configureCommandLineOptions(JobClient.java:557)
... 3 more
When run on hadoop server:
Trace:
Exception in thread "main" java.lang.ClassNotFoundException:
mapreduce.test.WordCount
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 java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at org.apache.hadoop.util.RunJar.main(RunJar.java:148)
Thanks!:-):-)
georgep wrote:
>
> Trace:
>
> Exception in thread "main" java.lang.ClassNotFoundException:
> mapreduce.test.WordCount
> 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 java.lang.ClassLoader.loadClass(ClassLoader.java:251)
> at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
> at java.lang.Class.forName0(Native Method)
> at java.lang.Class.forName(Class.java:247)
> at org.apache.hadoop.util.RunJar.main(RunJar.java:148)
>
> Code:
> public class WordCount{
>
> public static void main(String[] args) throws Exception {
> try {
> JobConf conf = new JobConf(WordCount.class);
> conf.setJobName("wordcount");
>
> conf.setOutputKeyClass(Text.class);
> conf.setOutputValueClass(IntWritable.class);
>
> conf.setMapperClass(Map.class);
> conf.setCombinerClass(Reduce.class);
> conf.setReducerClass(Reduce.class);
>
> conf.setInputFormat(TextInputFormat.class);
> conf.setOutputFormat(TextOutputFormat.class);
>
> FileInputFormat.setInputPaths(conf, new Path("input"));
> FileOutputFormat.setOutputPath(conf, new Path("output"));
>
> JobClient.runJob(conf);
> }
> catch (Exception t) {
> // TODO Auto-generated catch block
> t.printStackTrace();
> System.out.println("Problem");
> }
> }
>
> }
>
>
> Thank you!
>
>
>
> TimRobertson100 wrote:
>>
>> Can you post the entire error trace please?
>>
>> On Fri, May 8, 2009 at 9:40 AM, George Pang <[email protected]> wrote:
>>> Dear users,
>>> I got "ClassNotFoundException" when run the WordCount example on hadoop
>>> using Eclipse. Does anyone know where is the problem?
>>>
>>> Thank you!
>>>
>>> George
>>>
>>
>>
>
>
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