hadoop - How to implement WritableComparable interface? -


i need use method setgroupingcomparatorclass in job , takes argument of type writablecomparable.

i unable implement writablecomparable class.

please me solve this. regards, bidyut

    setgroupingcomparatorclass(class<? extends rawcomparator> cls)

define comparator controls keys grouped single call reducer.reduce(object, iterable, org.apache.hadoop.mapreduce.reducer.context)

    job.setgroupingcomparatorclass(customkey.groupcomparator.class);

in customkey class can write static method.

add below code in custom key class.

public class customkey implements writablecomparable<indexerkey> {      public static class groupcomparator extends writablecomparator             implements serializable {         private static final long serialversionuid = -3385728040072507941l;          public groupcomparator() {              super(customkey .class, true);          }          @suppresswarnings("rawtypes")         public int compare(writablecomparable a, writablecomparable b) {              customkey w1 = (customkey ) a;              customkey w2 = (customkey ) b;              return w1.comparegroup(w2);         }      } }

hope you.


Comments

Post a Comment

Popular posts from this blog

How to group boxplot outliers in gnuplot -

i have large set of data points. try plot them boxplot, of outliers exact same value , represented on line beside each other. found how set horizontal distance between outliers in gnuplot boxplot , doesn't much, apparently not possible. is possible group outliers together, print 1 point , print number in brackets beside indicate how many points there are? think make more readable in graph. for information, have 3 boxplots 1 x value , times 6 in 1 graph. using gnuplot 5 , played around pointsize, doesn't reduce distance anymore. hope can help! edit: set terminal pdf set output 'dat.pdf' file0 = 'dat1.dat' file1 = 'dat2.dat' file2 = 'dat3.dat' set pointsize 0.2 set notitle set xlabel 'x' set ylabel 'y' header = system('head -1 '.file0); n = words(header) set xtics ('' 1) set [i=1:n] xtics add (word(header, i) i) set style data boxplot plot file0 using (1-0.25):1:(0.2) boxplot lw 2 lc rgb '#8b0000...
Read more

cakephp - simple blog with croogo -

i not problem, made simple blog in croogo, problem is not adding or modifying or delete, because arabic language ?? function add in controller `public function admin_add() { $this->set('title_for_layout', __('add part')); if (!empty($this->request->data)) { $this->part->create(); if ($this->part->save($this->request->data)) { $this->session->setflash(__('the part has been saved'), 'default', array('class' => 'success')); $this->redirect(array('action' => 'index'));//, $this->part->id)); } else { $this->session->setflash(__('the part not saved. please, try again.'), 'default', array('class' => 'error')); } } }` => model `class part extends appmodel { public $name = 'part'; var $belongst...
Read more