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From Philip Zeyliger <phi...@cloudera.com>
Subject Re: Running hadoop in standalone mode using Eclipse
Date Wed, 17 Jun 2009 18:41:28 GMT
Hi George,

You're probably missing a handful of Java properties.  One way to
figure out which is to run it on the commandline, look at the
commandline with ps (you'll want the -ww flag to see the entire
thing), and adjust your Eclipse launch appropriately.

You could also try to patch in
https://issues.apache.org/jira/browse/HADOOP-5911 .  That's got
.launch files for NameNode, DataNode, JobTracker, and TaskTracker that
work for me, as well as one that I clone for running a given test.  If
those work for you, please do leave a note on the ticket.

-- Philip

On Sun, Jun 14, 2009 at 10:31 AM, George Kovoor
<kovoor.george@googlemail.com> wrote:
>
> Hi,
> I would like know how to run hadoop in standalone mode within eclipse, I am
> able to run it from outside eclipse, using
> /bin/hadoop <fully qualified classname> <args>
> From within eclipse I keep getting the following errors even after setting
> the working directory to the root install path
>
> log4j:WARN No appenders could be found for logger
> (org.apache.hadoop.conf.Configuration).
> log4j:WARN Please initialize the log4j system properly.
> Exception in thread "main" java.lang.NullPointerException
>    at
> org.apache.hadoop.conf.Configuration.getLocalPath(Configuration.java:788)
>    at org.apache.hadoop.mapred.JobConf.getLocalPath(JobConf.java:232)
>    at
> org.apache.hadoop.mapred.LocalJobRunner$Job.<init>(LocalJobRunner.java:83)
>    at
> org.apache.hadoop.mapred.LocalJobRunner.submitJob(LocalJobRunner.java:306)
>    at org.apache.hadoop.mapred.JobClient.submitJob(JobClient.java:843)
>    at org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:1142)
>    at org.apache.hadoop.examples.WordCount.run(WordCount.java:154)
>    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
>    at org.apache.hadoop.examples.WordCount.main(WordCount.java:160)
>
> It is definitively a configuration error, I would like to know the conf
> parameter that I need to include in the class file.
>
> Thanks
> George.

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