<commit_before><?xml version="1.0" encoding="UTF-8"?>
<chapter version="5.0" xml:id="chapter-Hadoop_Versions" xmlns="http://docbook.org/ns/docbook">
  <title>Hadoop Versions</title>
  <para>
      Let's take a moment to explore the different versions of Hadoop.  The following are/were the most known versions.

      <itemizedlist>
          <listitem>
              0.21  - Aug 2010 -- another widely used release.  This eventually became hadoop 1.0 release
          </listitem>
          <listitem>
              0.23 - Feb 2012 -- 0.23 was the branch created to add new features .  This branch eventually became Hadoop 2.0
          </listitem>
          <listitem>
              1.0 -- current production version of Hadoop
          </listitem>
          <listitem>
              2.0 -- current development version of Hadoop
          </listitem>
      </itemizedlist>
  </para>

  <graphic fileref="hadoop-versions.png"></graphic>

  <section>
      <title>Hadoop version 1.0</title>
      <para>This is currently the production version of Hadoop.  It has been in wide use for a while and has been proven in the field.  The following distributions are based on Hadoop 1.0
      <itemizedlist>
          <listitem>Cloudera's CDH 3 (Cloudera's Distribution of Hadoop) series </listitem>
          <listitem>HortonWorks's HDP 1 (HortonWorks Data Platform) series </listitem>
      </itemizedlist>
  </para>
  </section>

  <section>
      <title>Hadoop version 2.0</title>
      <para>
          This is a development branch of Hadoop.  Hadoop 2 has significant new enhancements.  It has been under development for a while.  Hadoop 2 has the following new features:

      <itemizedlist>
          <listitem>HDFS failover</listitem>
          <listitem>Federated Namenode</listitem>
          <listitem>Map Reduce version 2 (MRV2) also known as YARN</listitem>
      </itemizedlist>
      </para>

      <para>
          The following distributions currently bundle Hadoop 2
          <itemizedlist>
          <listitem>Cloudera's CDH 4 (Cloudera's Distribution of Hadoop) series </listitem>
          <listitem>HortonWorks's HDP 2 (HortonWorks Data Platform) series </listitem>
      </itemizedlist>
  </para>
  </section>
  <section>
      <title>History of Hadoop</title>
      <para>
        <graphic fileref="hadoop-history.png"></graphic>
      </para>
  </section>

</chapter>
<commit_msg>Update chapter-Hadoop_Versions.xml<commit_after><?xml version="1.0" encoding="UTF-8"?>
<chapter version="5.0" xml:id="chapter-Hadoop_Versions" xmlns="http://docbook.org/ns/docbook">
  <title>Hadoop Versions</title>
  <para>
      Let's take a moment to explore the different versions of Hadoop.  The following are/were the most known versions.

      <itemizedlist>
          <listitem>
              0.21  - Aug 2010 -- A widely used release.  This eventually became the Hadoop 1.0 release.
          </listitem>
          <listitem>
              0.23 - Feb 2012 -- Was a branch created to add new features.  This branch eventually became Hadoop 2.0
          </listitem>
          <listitem>
              1.0 -- Current production version of Hadoop
          </listitem>
          <listitem>
              2.0 -- Current development version of Hadoop
          </listitem>
      </itemizedlist>
  </para>

  <graphic fileref="hadoop-versions.png"></graphic>

  <section>
      <title>Hadoop version 1.0</title>
      <para>This is currently the production version of Hadoop.  It has been in wide use for a while and has been proven in the field.  The following distributions are based on Hadoop 1.0
      <itemizedlist>
          <listitem>Cloudera's CDH 3 (Cloudera's Distribution of Hadoop) series </listitem>
          <listitem>HortonWorks's HDP 1 (HortonWorks Data Platform) series </listitem>
      </itemizedlist>
  </para>
  </section>

  <section>
      <title>Hadoop version 2.0</title>
      <para>
          This is a development branch of Hadoop.  Hadoop 2 has significant new enhancements.  It has been under development for a while.  Hadoop 2 has the following new features:

      <itemizedlist>
          <listitem>HDFS failover</listitem>
          <listitem>Federated NameNode</listitem>
          <listitem>Map Reduce version 2 (MRV2) also known as YARN</listitem>
      </itemizedlist>
      </para>

      <para>
          The following distributions currently bundle Hadoop 2:
          <itemizedlist>
          <listitem>Cloudera's CDH4 (Cloudera's Distribution of Hadoop) series. </listitem>
          <listitem>Hortonworks's HDP2 (Hortonworks Data Platform) series. </listitem>
      </itemizedlist>
  </para>
  </section>
  <section>
      <title>History of Hadoop</title>
      <para>
        <graphic fileref="hadoop-history.png"></graphic>
      </para>
  </section>

</chapter>

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