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class="final" href="/algorithm/"><
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Algorithm</span></a></li><li class="level-2"><a class="final" 
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 ild/"><span>Building Evaluation Metrics</span></a></li></ul></li><li 
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class="level-2"><a class="final" href="/"><span>Welcome to Apache PredictionIO 
(incubating)</span></a></li></ul></li><li class="level-1"><a class="expandible" 
href="#"><span>Getting Started</span></a><ul><li class="level-2"><a 
class="final" href="/start/"><span>A Quick Intro</span></a></li><li 
class="level-2"><a class="final" href="/install/"><span>Installing Apache 
PredictionIO (incubating)</span></a></li><li class="level-2"><a class="final" 
href="/start/download/"><span>Downloading an Engine Template</span></a></li><li 
class="level-2"><a class="final" href="/start/deploy/"><span>Deploying Your 
First Engine</span></a></li><li class="level-2"><a class="final" 
href="/start/customize/"><span>Customizing the 
Engine</span></a></li></ul></li><li class="level-1"><a class="expandible" 
href="#"><span>Integrating with Your App</span></a
 ><ul><li class="level-2"><a class="final" href="/appintegration/"><span>App 
 >Integration Overview</span></a></li><li class="level-2"><a class="expandible" 
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 >Powered SDKs</span></a></li></ul></li></ul></li><li class="level-1"><a 
 >class="expandible" href="#"><span>Deploying an Engine</span></a><ul><li 
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 >Service</span></a></li><li class="level-2"><a class="final" 
 >href="/cli/#engine-commands"><span>Engine Command-line 
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 evel-2"><a class="final" href="/deploy/monitoring/"><span>Monitoring 
Engine</span></a></li><li class="level-2"><a class="final" 
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class="level-2"><a class="final" href="/deploy/enginevariants/"><span>Deploying 
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class="level-2"><a class="final" href="/customize/"><span>Learning 
DASE</span></a></li><li class="level-2"><a class="final" 
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Development</span></a></li><li class="level-2"><a class="final" 
href="/api/current/#package"><span>Engine Scala 
APIs</span></a></li></ul></li><li class="level-1"><a class="expandible" 
href="#"><span>Collecting and Analyzing Data</span></a><ul><li 
class="level-2"><a class="fina
 l" href="/datacollection/"><span>Event Server Overview</span></a></li><li 
class="level-2"><a class="final" href="/cli/#event-server-commands"><span>Event 
Server Command-line Interface</span></a></li><li class="level-2"><a 
class="final" href="/datacollection/eventapi/"><span>Collecting Data with 
REST/SDKs</span></a></li><li class="level-2"><a class="final" 
href="/datacollection/eventmodel/"><span>Events Modeling</span></a></li><li 
class="level-2"><a class="final" 
href="/datacollection/webhooks/"><span>Unifying Multichannel Data with 
Webhooks</span></a></li><li class="level-2"><a class="final" 
href="/datacollection/channel/"><span>Channel</span></a></li><li 
class="level-2"><a class="final" 
href="/datacollection/batchimport/"><span>Importing Data in 
Batch</span></a></li><li class="level-2"><a class="final" 
href="/datacollection/analytics/"><span>Using Analytics 
Tools</span></a></li></ul></li><li class="level-1"><a class="expandible" 
href="#"><span>Choosing an Algorithm(s)</span></a><ul
 ><li class="level-2"><a class="final" href="/algorithm/"><span>Built-in 
 >Algorithm Libraries</span></a></li><li class="level-2"><a class="final" 
 >href="/algorithm/switch/"><span>Switching to Another 
 >Algorithm</span></a></li><li class="level-2"><a class="final" 
 >href="/algorithm/multiple/"><span>Combining Multiple 
 >Algorithms</span></a></li><li class="level-2"><a class="final" 
 >href="/algorithm/custom/"><span>Adding Your Own 
 >Algorithms</span></a></li></ul></li><li class="level-1"><a class="expandible" 
 >href="#"><span>ML Tuning and Evaluation</span></a><ul><li class="level-2"><a 
 >class="final" href="/evaluation/"><span>Overview</span></a></li><li 
 >class="level-2"><a class="final" 
 >href="/evaluation/paramtuning/"><span>Hyperparameter 
 >Tuning</span></a></li><li class="level-2"><a class="final" 
 >href="/evaluation/evaluationdashboard/"><span>Evaluation 
 >Dashboard</span></a></li><li class="level-2"><a class="final" 
 >href="/evaluation/metricchoose/"><span>Choosing Evaluation 
 >Metrics</span></a></li><li c
 lass="level-2"><a class="final" href="/evaluation/metricbuild/"><span>Building 
Evaluation Metrics</span></a></li></ul></li><li class="level-1"><a 
class="expandible" href="#"><span>System Architecture</span></a><ul><li 
class="level-2"><a class="final" href="/system/"><span>Architecture 
Overview</span></a></li><li class="level-2"><a class="final active" 
href="/system/anotherdatastore/"><span>Using Another Data 
Store</span></a></li></ul></li><li class="level-1"><a class="expandible" 
href="#"><span>Engine Template Gallery</span></a><ul><li class="level-2"><a 
class="final" href="/gallery/template-gallery/"><span>Browse</span></a></li><li 
class="level-2"><a class="final" 
href="/community/submit-template/"><span>Submit your Engine as a 
Template</span></a></li></ul></li><li class="level-1"><a class="expandible" 
href="#"><span>Demo Tutorials</span></a><ul><li class="level-2"><a 
class="final" href="/demo/tapster/"><span>Comics Recommendation 
Demo</span></a></li><li class="level-2"><a class="f
 inal" href="/demo/community/"><span>Community Contributed 
Demo</span></a></li><li class="level-2"><a class="final" 
href="/demo/textclassification/"><span>Text Classification Engine 
Tutorial</span></a></li></ul></li><li class="level-1"><a class="expandible" 
href="/community/"><span>Getting Involved</span></a><ul><li class="level-2"><a 
class="final" href="/community/contribute-code/"><span>Contribute 
Code</span></a></li><li class="level-2"><a class="final" 
href="/community/contribute-documentation/"><span>Contribute 
Documentation</span></a></li><li class="level-2"><a class="final" 
href="/community/contribute-sdk/"><span>Contribute a SDK</span></a></li><li 
class="level-2"><a class="final" 
href="/community/contribute-webhook/"><span>Contribute a 
Webhook</span></a></li><li class="level-2"><a class="final" 
href="/community/projects/"><span>Community 
Projects</span></a></li></ul></li><li class="level-1"><a class="expandible" 
href="#"><span>Getting Help</span></a><ul><li class="level-2"><a 
 class="final" href="/resources/faq/"><span>FAQs</span></a></li><li 
class="level-2"><a class="final" 
href="/support/"><span>Support</span></a></li></ul></li><li class="level-1"><a 
class="expandible" href="#"><span>Resources</span></a><ul><li 
class="level-2"><a class="final" href="/resources/intellij/"><span>Developing 
Engines with IntelliJ IDEA</span></a></li><li class="level-2"><a class="final" 
href="/resources/upgrade/"><span>Upgrade Instructions</span></a></li><li 
class="level-2"><a class="final" 
href="/resources/glossary/"><span>Glossary</span></a></li></ul></li></ul></nav></div><div
 class="col-md-9 col-sm-12"><div class="content-header hidden-md 
hidden-lg"><div id="breadcrumbs" class="hidden-sm hidden xs"><ul><li><a 
href="#">System Architecture</a><span class="spacer">&gt;</span></li><li><span 
class="last">Using Another Data Store</span></li></ul></div><div 
id="page-title"><h1>Using Another Data Store</h1></div></div><div 
id="table-of-content-wrapper"><h5>On this page</h5><aside
  id="table-of-contents"><ul> <li> <a href="#concepts">Concepts</a> </li> <li> 
<a href="#data-store-configuration">Data Store Configuration</a> </li> <li> <a 
href="#adding-support-of-other-backends">Adding Support of Other Backends</a> 
</li> </ul> </aside><hr/><a id="edit-page-link" 
href="https://github.com/apache/incubator-predictionio/tree/livedoc/docs/manual/source/system/anotherdatastore.html.md";><img
 src="/images/icons/edit-pencil-d6c1bb3d.png"/>Edit this page</a></div><div 
class="content-header hidden-sm hidden-xs"><div id="breadcrumbs" 
class="hidden-sm hidden xs"><ul><li><a href="#">System Architecture</a><span 
class="spacer">&gt;</span></li><li><span class="last">Using Another Data 
Store</span></li></ul></div><div id="page-title"><h1>Using Another Data 
Store</h1></div></div><div class="content"><p>PredictionIO has a thin storage 
layer to abstract meta data, event data, and model data access. The layer 
defines a set of standard interfaces to support multiple data store backend
 s. PredictionIO users can configure the backend of choice through 
configuration files or environmental variables. Engine developers need not 
worry about the actual underlying storage architecture. Advanced developers can 
implement their own backend driver as an external library.</p><h2 id='concepts' 
class='header-anchors'>Concepts</h2><p>In this section, we will visit some 
storage layer concepts that are common to users, engine developers, and 
advanced developers:</p> <ul> <li><p><strong>Repository</strong> is the highest 
level of data access abstraction and is where all engines and PredictionIO 
itself access data with.</p></li> <li><p><strong>Source</strong> is the actual 
data store backend that provide data access. A source is an implementation of 
the set of data access interfaces defined by <em>repositories</em>.</p></li> 
</ul> <p>Each of them will be explained in detail below:</p><h3 
id='repositories' 
class='header-anchors'>Repositories</h3><p><em>Repository</em> is the highest 
 level of data access abstraction and is where all engines and PredictionIO 
itself access data with.</p><p>The storage layer currently defines three 
mandatory data repositories: <em>meta data</em>, <em>event data</em>, and 
<em>model data</em>. Each repository has its own set of data access 
interfaces.</p> <ul> <li><p><strong>Meta data</strong> is used by PredictionIO 
to store engine training and evaluation information. Commands like <code>pio 
build</code>, <code>pio train</code>, <code>pio deploy</code>, and <code>pio 
eval</code> all access meta data.</p></li> <li><p><strong>Event data</strong> 
is used by the Event Server to collect events, and by engines to source 
data.</p></li> <li><p><strong>Model data</strong> is used by PredictionIO for 
automatic persistence of trained models.</p></li> </ul> <p>The following 
configuration variables are used for configure these repositories:</p> <ul> 
<li><em>Meta data</em> is configured by the 
<code>PIO_STORAGE_REPOSITORIES_METADATA_XXX</code> va
 riables.</li> <li><em>Event data</em> is configured by the 
<code>PIO_STORAGE_REPOSITORIES_EVENTDATA_XXX</code> variables.</li> 
<li><em>Model data</em> is configured by the 
<code>PIO_STORAGE_REPOSITORIES_MODELDATA_XXX</code> variables.</li> </ul> 
<p>Configuration variables will be explained in more details in later sections 
below (see Data Store Configuration).</p><p>For example, you may see the 
following configuration variables defined in 
<code>conf/pio-env.sh</code></p><div class="highlight shell"><table 
style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: 
right"><pre class="lineno">1
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hidden-lg"><div id="breadcrumbs" class="hidden-sm hidden xs"><ul><li><a 
href="#">System Architecture</a><span class="spacer">&gt;</span></li><li><span 
class="last">Using Another Data Store</span></li></ul></div><div 
id="page-title"><h1>Using Another Data Store</h1></div></div><div 
id="table-of-content-wrapper"><h5>On this page</h5><aside 
 id="table-of-contents"><ul> <li> <a href="#concepts">Concepts</a> </li> <li> 
<a href="#data-store-configuration">Data Store Configuration</a> </li> <li> <a 
href="#adding-support-of-other-backends">Adding Support of Other Backends</a> 
</li> </ul> </aside><hr/><a id="edit-page-link" 
href="https://github.com/apache/incubator-predictionio/tree/livedoc/docs/manual/source/system/anotherdatastore.html.md";><img
 src="/images/icons/edit-pencil-d6c1bb3d.png"/>Edit this page</a></div><div 
class="content-header hidden-sm hidden-xs"><div id="breadcrumbs" 
class="hidden-sm hidden xs"><ul><li><a href="#">System Architecture</a><span 
class="spacer">&gt;</span></li><li><span class="last">Using Another Data 
Store</span></li></ul></div><div id="page-title"><h1>Using Another Data 
Store</h1></div></div><div class="content"><p>PredictionIO has a thin storage 
layer to abstract meta data, event data, and model data access. The layer 
defines a set of standard interfaces to support multiple data store backends
 . PredictionIO users can configure the backend of choice through configuration 
files or environmental variables. Engine developers need not worry about the 
actual underlying storage architecture. Advanced developers can implement their 
own backend driver as an external library.</p><h2 id='concepts' 
class='header-anchors'>Concepts</h2><p>In this section, we will visit some 
storage layer concepts that are common to users, engine developers, and 
advanced developers:</p> <ul> <li><p><strong>Repository</strong> is the highest 
level of data access abstraction and is where all engines and PredictionIO 
itself access data with.</p></li> <li><p><strong>Source</strong> is the actual 
data store backend that provide data access. A source is an implementation of 
the set of data access interfaces defined by <em>repositories</em>.</p></li> 
</ul> <p>Each of them will be explained in detail below:</p><h3 
id='repositories' 
class='header-anchors'>Repositories</h3><p><em>Repository</em> is the highest l
 evel of data access abstraction and is where all engines and PredictionIO 
itself access data with.</p><p>The storage layer currently defines three 
mandatory data repositories: <em>meta data</em>, <em>event data</em>, and 
<em>model data</em>. Each repository has its own set of data access 
interfaces.</p> <ul> <li><p><strong>Meta data</strong> is used by PredictionIO 
to store engine training and evaluation information. Commands like <code>pio 
build</code>, <code>pio train</code>, <code>pio deploy</code>, and <code>pio 
eval</code> all access meta data.</p></li> <li><p><strong>Event data</strong> 
is used by the Event Server to collect events, and by engines to source 
data.</p></li> <li><p><strong>Model data</strong> is used by PredictionIO for 
automatic persistence of trained models.</p></li> </ul> <p>The following 
configuration variables are used for configure these repositories:</p> <ul> 
<li><em>Meta data</em> is configured by the 
<code>PIO_STORAGE_REPOSITORIES_METADATA_XXX</code> var
 iables.</li> <li><em>Event data</em> is configured by the 
<code>PIO_STORAGE_REPOSITORIES_EVENTDATA_XXX</code> variables.</li> 
<li><em>Model data</em> is configured by the 
<code>PIO_STORAGE_REPOSITORIES_MODELDATA_XXX</code> variables.</li> </ul> 
<p>Configuration variables will be explained in more details in later sections 
below (see Data Store Configuration).</p><p>For example, you may see the 
following configuration variables defined in 
<code>conf/pio-env.sh</code></p><div class="highlight shell"><table 
style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: 
right"><pre class="lineno">1
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