java - hbase export to flat file -

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i'm pretty new hadoop...

i have bunch of data in hbase table need export (with minor transformation) out single flat file. this, building mapreduce job scans table , maps data text type textoutputformat.

something this:

tablemapreduceutil.inittablemapperjob("tablename",      // input table     scan,             // scan instance control cf , attribute selection     mymapper.class,   // mapper class     text.class,             // mapper output key     text.class,             // mapper output value     job);  job.setnumreducetasks(1); job.setoutputformatclass(textoutputformat.class); job.setoutputkeyclass(text.class); job.setoutputvalueclass(text.class);  fileoutputformat.setoutputpath(job, new path("/tmp/mydirectory"));

and mapper:

private static class mymapper extends tablemapper<text, text> {     public void map(immutablebyteswritable row, result result, context context) throws ioexception,         interruptedexception {         string json = new string(result.getvalue("cf".getbytes(), "qualifier".getbytes()));          stringbuilder line = new stringbuilder();          //...builds line          text k = new text("filename-20141205.txt");         text linetext = new text(line.tostring());         context.write(k, linetext);     } }

however, out single file keys , data in part-r-00000 file. think need reducer finish job, i'm not sure looks like.

would identity reducer work? there better way go problem other textoutputformat?

this worked:

private static class myoutputformat<k, v> extends textoutputformat<k, v>{     @override     public path getdefaultworkfile(taskattemptcontext context, string extension) throws ioexception {         fileoutputcommitter committer =              (fileoutputcommitter) getoutputcommitter(context);           return new path(committer.getworkpath(), "my-file-name.txt");     } }

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