Hi,
configure(JobConf conf)method in
http://hadoop.apache.org/common/docs/r0.20.0/api/org/apache/hadoop/mapred/MapReduceBase.html
is your friend.
Try something like this,
public class BobsMapper extends MapReduceBase implements
Mapper<LongWritable, Text, Text, Text> {
private Path out_path = null;
/**
* Use to configure map job.
* Parameters from configure XML can be accessed here.
* This will be called once before framework start calling map()
iteratively for given input file
*/
public void configure(JobConf conf) {
try {
super.configure(conf);
//get parameter values from configuration XML
out_path = new Path(conf.get("outputPath"));
}
catch (Exception e) {
_log.error("Problem configuring map job. " + e.getMessage());
}
}
/** the mapper should not be able to access out_path.
public void map(...) {
}
}
On Mon, Dec 13, 2010 at 12:54 PM, Eric <[email protected]> wrote:
>
> Hi,
>
> I'm looking for a way to pass options to my Map class. More specifically,
I want my mappers to write to sequence files in a path that I can specify on
the command line. I tried setting a variable with:
>
> Jobconf conf = ........;
> conf.set("outputPath", "/foo/bar");
>
> (I'm using the deprecated libraries)
>
> I can not retrieve this setting in my mapper however. Is there another
way, or am I doing something wrong?
>
> Best regards,
> Eric
