com.ebay.erl.mobius.core
Class GroupByConfigure

java.lang.Object
  extended by com.ebay.erl.mobius.core.GroupByConfigure

public class GroupByConfigure
extends java.lang.Object

Specify the "group-by" columns in a grouping job.

This class cannot be initialized directly by users. Use MobiusJob.group(Dataset) to get an instance of this class and start a group-by job. This product is licensed under the Apache License, Version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0. This product contains portions derived from Apache hadoop which is licensed under the Apache License, Version 2.0, available at http://hadoop.apache.org. © 2007 – 2012 eBay Inc., Evan Chiu, Woody Zhou, Neel Sundaresan


Method Summary
 Persistable by(java.lang.String... columns)
          Specify the columns to be grouped by.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Method Detail

by

public Persistable by(java.lang.String... columns)
               throws java.io.IOException
Specify the columns to be grouped by.

columns must all in the participated Dataset, the one specified in MobiusJob.group(Dataset).

Throws:
java.io.IOException