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These settings inform the framework of the types of the key/value pairs to expect for the reduce phase By default, these classes will also be used to set the values the framework will expect from the map output Unsurprisingly, the method to set the output key class for the map output is confsetMapOutputKeyClass(Class< extends WritableComparable>) To set the output value class, the method is confsetMapOutputValueClass(Class< extends Writable>) Listing 2-5 WritableComparablejava /** * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements See the NOTICE file * distributed with this work for additional information * regarding copyright ownership The ASF licenses this file * to you under the Apache License, Version 20 (the * "License"); you may not use this file except in compliance * with the License You may obtain a copy of the License at * * http://wwwapache.

JavaScript is Prototypal(-ish)

org/licenses/LICENSE-20 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied * See the License for the specific language governing permissions and * limitations under the License */.

<my:myFields xmlns:my="http://schemas.microsoft.com/office/infopath/2003/myXSD/ 2006-03-17T23:43:09" xml:lang="en-us"> <my:DateString>2006-03-17T09:00:00</my:DateString> <my:DateDate xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> 2006-03-17</my:DateDate> <my:DateTime xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> 2006-03-17T09:00:00 </my:DateTime> </my:myFields> Note the varying data types of the XML elements the first is a simple text value; the following two are set with namespace pointers. Also note that the second element only has the date, while the third has the date and time. Finally, note the formatting of the datetime strings in the elements with time included. The T is used to separate the date and time elements, and the time is reported using 24-hour clock standards. This is the standard datetime format for XML elements, and is worth knowing if you re going to generate your own XML.

package org.apache.hadoop.io; /** * A {@link Writable} which is also {@link Comparable}. * * <p><code>WritableComparable</code>s can be compared to each other, typically * via <code>Comparator</code>s. Any type which is to be used as a * <code>key</code> in the Hadoop Map-Reduce framework should implement this * interface.</p> * * <p>Example:</p> * <p><blockquote><pre> * public class MyWritableComparable implements WritableComparable { * // Some data * private int counter; * private long timestamp; * * public void write(DataOutput out) throws IOException { * out.writeInt(counter); * out.writeLong(timestamp); * } * * public void readFields(DataInput in) throws IOException { * counter = in.readInt(); * timestamp = in.readLong(); * } * * public int compareTo(MyWritableComparable w) { * int thisValue = this.value; * int thatValue = ((IntWritable)o).value; * return (thisValue < thatValue -1 : (thisValue==thatValue 0 : 1)); * } * } * </pre></blockquote></p> */ public interface WritableComparable<T> extends Writable, Comparable<T> { } Listing 2-6. Writable.java /** * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file

While all OO languages deal with objects at their core, the process by which objects are created and composed divides most OO languages into two camps: Classical (or class-based) object-oriented languages use classes to create objects. A class is a special data type that serves as a blueprint for creating objects. In a classical OO language, you define the structure of an object by creating a class for it and then create the object itself by creating an instance of the class, in a process called instantiation. Prototypal (or prototype-based) object-oriented languages, on the other hand, do not have classes but rely on other objects as blueprints. In a prototypal language, you create an actual object called the prototype that reflects the structure you want and this object is then used as a blueprint for your other objects. You create new instances by copying the prototype itself in a process called cloning. In pure prototypal languages, all objects can be used as prototypes.