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| <h1 id="about-gora">About Gora<a class="headerlink" href="#about-gora" title="Permalink">¶</a></h1> |
| <div id="toc"><ul><li><a class="toc-href" href="#why-gora" title="Why Gora?">Why Gora?</a></li><li><a class="toc-href" href="#who-is-gora-for" title="Who is Gora For?">Who is Gora For?</a></li><li><a class="toc-href" href="#background" title="Background">Background</a></li><li><a class="toc-href" href="#what-platforms-does-gora-work-on" title="What Platform(s) does Gora work on?">What Platform(s) does Gora work on?</a></li><li><a class="toc-href" href="#which-languagestechnologies-do-i-need-to-know-to-use-gora" title="Which Languages/Technologies do I need to know to use Gora?">Which Languages/Technologies do I need to know to use Gora?</a></li></ul></div> |
| <h2 id="why-gora">Why Gora?<a class="headerlink" href="#why-gora" title="Permalink">¶</a></h2> |
| <p>Although there are various excellent ORM frameworks such as JPA, Apache OpenJPA, Hibernate, etc for relational databases, data modeling in |
| NoSQL data stores differ profoundly from their relational cousins. Moreover, data-model agnostic |
| frameworks such as JDO are not sufficient for use cases, where one needs to use the full power |
| of the data models in column stores (for example). Gora fills this gap by giving the user an easy-to-use in-memory |
| data model and persistence for big data framework with data store specific mappings and built |
| in <a href="http://hadoop.apache.org">Apache Hadoop™</a> support.</p> |
| <p>The overall goal for Gora is to become the standard data representation and persistence framework |
| for big data. The roadmap of Gora can be grouped as follows:</p> |
| <ul> |
| <li>Data Persistence : Persisting objects to Column stores such as <a href="http://hbase.apache.org">Apache HBase™</a>, |
| <a href="http://cassandra.apache.org">Apache Cassandra™</a>, <a href="http://hypertable.org/">Hypertable</a>; |
| key-value stores such as <a href="http://www.project-voldemort.com/voldemort">Voldermort</a>, <a href="http://redis.io/">Redis</a>, |
| etc; SQL databases, such as <a href="http://www.mysql.com/">MySQL</a>, <a href="http://hsqldb.org/">HSQLDB</a>, flat files |
| in local file system of <a href="http://hadoop.apache.org/docs/stable/hdfs_user_guide.html">Hadoop HDFS</a>;</li> |
| <li>Data Access : An easy to use Java-friendly common API for accessing the data regardless of its location;</li> |
| <li>Indexing : Persisting objects to <a href="http://lucene.apache.org">Apache Lucene</a> and |
| <a href="http://lucene.apache.org/solr">Apache Solr</a> indexes, accessing/querying the data with Gora API;</li> |
| <li>Analysis : Accesing the data and making analysis through adapters for <a href="http://pig.apache.org">Apache Pig</a>, |
| <a href="http://hive.apache.org">Apache Hive</a> and <a href="http://www.cascading.org/">Cascading</a>;</li> |
| <li>MapReduce support : Out-of-the-box and extensive |
| <a href="http://hadoop.apache.org/docs/stable/mapred_tutorial.html">MapReduce</a> (<a href="http://hadoop.apache.org">Apache Hadoop™</a>) |
| support for data in the data store.</li> |
| </ul> |
| <h2 id="who-is-gora-for">Who is Gora For?<a class="headerlink" href="#who-is-gora-for" title="Permalink">¶</a></h2> |
| <p>Gora is a framework primarily aimed towards</p> |
| <ul> |
| <li><b>Hands on Developers</b> required to deal with data volumes which justify Big Data storage solutions classified under |
| the NoSQL umbrella.</li> |
| <li>Developers who seek a <b>Java friendly (REST-style) API</b> for mapping Java objects to and from |
| NoSQL technologies.</li> |
| <li><b>Development and/or Testing Engineers</b> looking to quickly set up and deploy applications on top of |
| Big Data storage mediums. This includes testing how applications are suited to underlying data stores |
| as data stores are easily interchanged.</li> |
| <li>Developers interested in <b>technology agnostic storage methods</b> for addressing data storage tasks.</li> |
| <li><b>Decision Makers</b> looking to implement a flexible storage framework under the <a href="http://www.apache.org/licenses/LICENSE-2.0">most liberal |
| open source license available</a>.</li> |
| </ul> |
| <h2 id="background">Background<a class="headerlink" href="#background" title="Permalink">¶</a></h2> |
| <p><b>ORM</b> stands for <a href="http://en.wikipedia.org/wiki/Object-relational_mapping">Object Relation Mapping</a>. It is a technology which abstacts the persistency layer |
| (mostly Relational Databases) so that plain domain level objects can be used, without the cumbersome |
| effort to save/load the data to and from the database.</p> |
| <p>Gora extends this concept to introduce <b>Object-to-Datastore Mapping</b> where the underlying |
| technological implementations rely mostly on non-relational data modeling. In essence |
| Gora provides storage abstraction for NoSQL technologies.</p> |
| <p>Gora differs from current solutions in that:</p> |
| <ul> |
| <li>Gora is specially focussed at NoSQL data stores, but also has limited support for SQL databases.</li> |
| <li>The main use case for Gora is to access/analyze big data using <a href="http://hadoop.apache.org">Apache Hadoop™</a>.</li> |
| <li>Gora uses <a href="http://avro.apache.org">Apache Avro</a> for bean definition, not byte code enhancement or annotations.</li> |
| <li>Object-to-data store mappings are backend specific, so that full data model can be utilized.</li> |
| <li>Gora is simple since it ignores complex SQL mappings.</li> |
| <li>Gora will support persistence, indexing and anaysis of data, using <a href="http://pig.apache.org">Apache Pig</a>, |
| <a href="http://lucene.apache.org">Apache Lucene</a>, <a href="http://hive.apache.org">Apache Hive</a>, etc.</li> |
| </ul> |
| <h2 id="what-platforms-does-gora-work-on">What Platform(s) does Gora work on?<a class="headerlink" href="#what-platforms-does-gora-work-on" title="Permalink">¶</a></h2> |
| <p>Gora <a href="https://builds.apache.org/view/All/job/gora-trunk/">builds nightly</a> on Ubuntu.</p> |
| <p>The software has been tested and verified to run on the following platforms:</p> |
| <ul> |
| <li>Mac OSX 10.9.3</li> |
| <li>Linux Mint</li> |
| <li>Ubuntu</li> |
| </ul> |
| <p>Gora does publish <b>.zip</b> artifacts for Windows users, however there is no gurantee |
| of platform compatibility.</p> |
| <p>Please provide platform compatibility issues and/or feedback to our <a href="./mailing_lists.html">mailing lists</a>.</p> |
| <h2 id="which-languagestechnologies-do-i-need-to-know-to-use-gora">Which Languages/Technologies do I need to know to use Gora?<a class="headerlink" href="#which-languagestechnologies-do-i-need-to-know-to-use-gora" title="Permalink">¶</a></h2> |
| <ul> |
| <li>Gora is written in Java.</li> |
| <li>Configuration however requires a working knowledge of syntax for JSON and XML.</li> |
| <li>You should be able to use the command line terminal.</li> |
| <li>You should be able to use Apache Maven from the command line.</li> |
| <li>You should be able to edit simple flat files using a text editor.</li> |
| </ul> |
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