Thanks for the help, Brien.
--Prateek.
On Fri, Feb 5, 2010 at 11:26 PM, brien colwell <xcolw...@gmail.com> wrote:
> To get a feel for Hadoop, I'd recommend using Eclipse and using a single
> node to start. If you add all the Hadoop JARs to your Eclipse build path, I
> think there are five, then Eclipse will manage the classpath for you.
>
> The following config settings will set up Hadoop to use the local file
> system and run your MapRed job in a single JVM. In this way you can set also
> breakpoints and take it step by step.
>
> Configuration baseConf = new Configuration();
> baseConf.set("mapred.job.tracker", "local");
> baseConf.set("fs.default.name", "file:///");
> baseConf.set("mapred.system.dir",
> String.format("%s/hadoop/mapred/system", LOCAL_TEMP_DIR));
> baseConf.set("mapred.local.dir",
> String.format("%s/hadoop/mapred/data", LOCAL_TEMP_DIR));
> baseConf.set("dfs.name.dir", String.format("%s/hadoop/namespace",
> LOCAL_TEMP_DIR));
> baseConf.set("dfs.data.dir", String.format("%s/hadoop/data",
> LOCAL_TEMP_DIR));
>
>
> Then use this configuration when setting up a JobConf.
>
>
> hope that helps,
>
> Brien
>
>
>
>
> On 2/5/2010 5:58 PM, Prateek Jindal wrote:
>
>> Hi everyone,
>>
>> I am new to mapReduce. I am trying to run a very basic mapReduce
>> application. I encountered the following problem. Can someone help me
>> about
>> it:
>>
>> 1) I have 3 files, namely MaxTemperature.java, MaxTemperatureMapper.java,
>> MaxTemperatureReducer.java. Now, I have to compile them to get the
>> '.class'
>> files which would be used by 'hadoop' command. I tried the following:
>>
>> 'javac -cp .:/hadoop/lib MaxTemperatureMapper.java'
>>
>> But it gives me the error that it doesn't recognize the packages '
>> org.apache.hadoop.io', 'org.apache.hadoop.mapred' and so on.
>>
>> Can someone suggest something about that?
>>
>> 2) Also, do we have to make the '.class' files by ourselves necessarily.
>> Or
>> is it somehow possible that hadoop will make .class files by itself (from
>> the .java source files)?
>>
>> Thanks,
>> Prateek.
>>
>>
>>
>
>
