Author: buildbot
Date: Wed Sep 4 20:31:48 2019
New Revision: 1049640
Log:
Staging update by buildbot for gora
Added:
websites/staging/gora/trunk/content/current/gora-pig.html
Modified:
websites/staging/gora/trunk/content/ (props changed)
Propchange: websites/staging/gora/trunk/content/
------------------------------------------------------------------------------
--- cms:source-revision (original)
+++ cms:source-revision Wed Sep 4 20:31:48 2019
@@ -1 +1 @@
-1866343
+1866419
Added: websites/staging/gora/trunk/content/current/gora-pig.html
==============================================================================
--- websites/staging/gora/trunk/content/current/gora-pig.html (added)
+++ websites/staging/gora/trunk/content/current/gora-pig.html Wed Sep 4
20:31:48 2019
@@ -0,0 +1,381 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd";>
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements. See the NOTICE file
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+"License"); you may not use this file except in compliance
+with the License. You may obtain a copy of the License at
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+
+Unless required by applicable law or agreed to in writing,
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+KIND, either express or implied. See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+<html>
+<head>
+ <meta http-equiv="content-type" content="text/html; charset=UTF-8" />
+ <meta charset="utf-8" />
+ <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+ <meta name="author" content="[email protected]" />
+
+ <META http-equiv="Content-Type" content="text/html;charset=UTF-8" />
+ <META name="Description" content="Apache Gora -- " />
+ <META name="Keywords" content="Apache Gora NoSQL Framework" />
+ <META name="Owner" content="[email protected]" />
+ <META name="Robots" content="index, follow" />
+ <META name="Security" content="Public" />
+ <META name="Source" content="wiki template" />
+ <META name="DC.Rights" content="Copyright 2010-2014, The Apache Software
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+
+ <!-- The styles -->
+ <link href="./../resources/css/bootstrap.css" rel="stylesheet">
+ <style type="text/css">
+ body {
+ padding-top: 60px;
+ padding-bottom: 40px;
+ }
+ </style>
+ <link href="./../resources/css/bootstrap-responsive.css" rel="stylesheet">
+ <link href="./../resources/css/gora.css" rel="stylesheet">
+
+ <style type="text/css">
+ .stpulldown-gradient
+ {
+ background: #E1E1E1;
+ background: -moz-linear-gradient(top, #E1E1E1 0%, #A7A7A7 100%); /*
firefox */
+ background: -webkit-gradient(linear, left top, left bottom,
color-stop(0%,#E1E1E1), color-stop(100%,#A7A7A7)); /* webkit */
+ filter: progid:DXImageTransform.Microsoft.gradient(
startColorstr='#E1E1E1', endColorstr='#A7A7A7',GradientType=0 ); /* ie */
+ background: -o-linear-gradient(top, #E1E1E1 0%,#A7A7A7 100%); /* opera */
+ color: #636363;
+ }
+ #stpulldown .stpulldown-logo
+ {
+ height: 40px;
+ width: 300px;
+ margin-left: 20px;
+ margin-top: 5px;
+ background:url("http://gora.apache.org/resources/img/feather-small.png";)
no-repeat;
+ }
+ </style>
+ <!-- HTML5 shim, for IE6-8 support of HTML5 elements -->
+ <!--[if lt IE 9]>
+ <script src="http://html5shim.googlecode.com/svn/trunk/html5.js";></script>
+ <![endif]-->
+
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+ <link rel="apple-touch-icon-precomposed" sizes="144x144"
href="http://twitter.github.com/bootstrap/assets/ico/apple-touch-icon-144-precomposed.png";>
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+ <link rel="apple-touch-icon-precomposed" sizes="72x72"
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+ <link rel="apple-touch-icon-precomposed"
href="http://twitter.github.com/bootstrap/assets/ico/apple-touch-icon-57-precomposed.png";>
+ <link rel="shortcut icon" href="./../resources/img/feather-small.png">
+
+ <title>Apache Gora™ - </title>
+</head>
+
+<body>
+ <div class="navbar navbar-inverse navbar-fixed-top">
+ <div class="navbar-inner">
+ <div class="container">
+ <a class="btn btn-navbar" data-toggle="collapse"
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+ <form id="search-form" class="navbar-search pull-right"
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+ <input value="gora.apache.org" name="sitesearch" type="hidden" />
+ <input class="search-query" name="q" id="query" type="text" />
+ </form>
+ <script type="text/javascript"
src="http://www.google.com/coop/cse/brand?form=search-form";></script>
+ </div> <!--/.nav-collapse -->
+ </div> <!-- /container -->
+ </div> <!-- /navbar-inner -->
+ </div> <!-- /navbar -->
+
+ <div class="container top-buffer" id="Gora_">
+
+<style type="text/css">
+/* The following code is added by mdx_elementid.py
+ It was originally lifted from http://subversion.apache.org/style/site.css */
+/*
+ * Hide class="elementid-permalink", except when an enclosing heading
+ * has the :hover property.
+ */
+.headerlink, .elementid-permalink {
+ visibility: hidden;
+}
+h2:hover > .headerlink, h3:hover > .headerlink, h1:hover > .headerlink,
h6:hover > .headerlink, h4:hover > .headerlink, h5:hover > .headerlink,
dt:hover > .elementid-permalink { visibility: visible }</style>
+<h2 id="overview">Overview<a class="headerlink" href="#overview"
title="Permanent link">¶</a></h2>
+<p>This is the main documentation for the gora-pig module. gora-pig module
enables loading/storing data through Apache Gora in Pig Scripts.</p>
+<div class="toc">
+<ul>
+<li><a href="#overview">Overview</a></li>
+<li><a href="#introduction">Introduction</a><ul>
+<li><a href="#data-models">Data models</a><ul>
+<li><a href="#primitivesimple-types">Primitive/Simple types</a></li>
+<li><a href="#comples-types">Comples types</a></li>
+</ul>
+</li>
+</ul>
+</li>
+<li><a href="#reading-from-datastores">Reading from datastores</a><ul>
+<li><a href="#full-options-for-load">Full options for LOAD</a></li>
+</ul>
+</li>
+<li><a href="#writing-to-datastores">Writing to datastores</a></li>
+<li><a href="#deleting-elements">Deleting elements</a></li>
+</ul>
+</div>
+<h2 id="introduction">Introduction<a class="headerlink" href="#introduction"
title="Permanent link">¶</a></h2>
+<p>Apache Gora is an Object Datastore Mapper which has its own data model. At
the same time, Apache Pig has its own data model too. Because of this, it is
needed an adaptation between both data models.</p>
+<p>The objective of this document is to describe the approach taken to
implement a Pig adapter for Gora.</p>
+<p>Warning: Not all Gora modules are adapted to be used under Pig, since they
have to implement loading the mapping defined from gora properties with the key
"gora.mapping". At this moment are adapted <strong>gora-hbase</strong> and
<strong>gora-kudu</strong>.</p>
+<h3 id="data-models">Data models<a class="headerlink" href="#data-models"
title="Permanent link">¶</a></h3>
+<p>Gora's data entities are generated from Apache Avro schemas, and inherits
the same datatypes defined in Avro. Pig has its own data model.</p>
+<p>The following tables shows the different types and a possible conversions
between Gora and Pig types.</p>
+<h4 id="primitivesimple-types">Primitive/Simple types<a class="headerlink"
href="#primitivesimple-types" title="Permanent link">¶</a></h4>
+<table class="table">
+<thead>
+<tr>
+<th>Gora</th>
+<th>Pig</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>null</td>
+<td>null</td>
+</tr>
+<tr>
+<td>boolean</td>
+<td>boolean</td>
+</tr>
+<tr>
+<td>int (32-bit)</td>
+<td>int (32-bit)</td>
+</tr>
+<tr>
+<td>long (64-bit)</td>
+<td>long (64-bit)</td>
+</tr>
+<tr>
+<td>float (32-bit)</td>
+<td>float (32-bit)</td>
+</tr>
+<tr>
+<td>double (64-bit)</td>
+<td>double (64-bit)</td>
+</tr>
+<tr>
+<td>bytes (8-bit)</td>
+<td>bytearray</td>
+</tr>
+<tr>
+<td>string (unicode)</td>
+<td>chararray (string UTF-8)</td>
+</tr>
+<tr>
+<td>-</td>
+<td>datetime</td>
+</tr>
+<tr>
+<td>-</td>
+<td>biginteger</td>
+</tr>
+<tr>
+<td>-</td>
+<td>bigdecimal</td>
+</tr>
+</tbody>
+</table>
+<h4 id="comples-types">Comples types<a class="headerlink"
href="#comples-types" title="Permanent link">¶</a></h4>
+<table class="table">
+<thead>
+<tr>
+<th>Gora</th>
+<th>Pig</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>record</td>
+<td>tuple</td>
+</tr>
+<tr>
+<td>enum</td>
+<td>int</td>
+</tr>
+<tr>
+<td>array</td>
+<td>bag</td>
+</tr>
+<tr>
+<td>map<String, 'b></td>
+<td>map<chararray, 'b></td>
+</tr>
+<tr>
+<td>union</td>
+<td>[the non-null type]</td>
+</tr>
+<tr>
+<td>fixed</td>
+<td>-</td>
+</tr>
+</tbody>
+</table>
+<p>Since <code>datetime</code>, <code>biginteger</code> and
<code>bigdecimal</code> aren't handled by Apache Gora, it isn't possible to
persist those types.</p>
+<p>For unions, only nullable fields (<code>union:[null, type]</code>) are
handled. Fixed type is not handled.</p>
+<p>Notice that Gora's records are converted into Pig's tuples, and arrays into
bags (index matters). When persisting, those types are the expected when
checking the schemas.</p>
+<h2 id="reading-from-datastores">Reading from datastores<a class="headerlink"
href="#reading-from-datastores" title="Permanent link">¶</a></h2>
+<p>The storage GoraStorage is the responsible for loading and persisting
entities. The simplest syntax to load data is the following:</p>
+<div class="codehilite"><pre> <span class="n">register</span> <span
class="n">gora</span><span class="o">/*</span><span class="p">.</span><span
class="n">jar</span><span class="p">;</span>
+ <span class="n">webpage</span> <span class="p">=</span> <span
class="n">LOAD</span> <span class="s">'.'</span> <span
class="n">USING</span> <span class="n">org</span><span class="p">.</span><span
class="n">apache</span><span class="p">.</span><span class="n">gora</span><span
class="p">.</span><span class="n">pig</span><span class="p">.</span><span
class="n">GoraStorage</span><span class="p">(</span><span
class="s">'{</span>
+<span class="s"> "persistentClass":
"admin.WebPage",</span>
+<span class="s"> "fields":
"baseUrl,status,content"</span>
+<span class="s"> }'</span><span class="p">)</span> <span
class="p">;</span>
+</pre></div>
+
+
+<p>It loads the fields <code>baseUrl</code>, <code>status</code> and
<code>content</code> <strong>(must not have spaces!)</strong> for the entity
<code>WebPage</code>.</p>
+<p>The files <code>gora.properties</code>, <code>gora-xxx-mapping.xml</code>
and support files are provided through the classpath to Pig client. They must
be included inside one of the registered <code>*.jar</code> files.</p>
+<p>The complete <code>LOAD</code> options allows to configure the options for
each storage and avoid using the global configuration files when multiple
different stores are used:</p>
+<div class="codehilite"><pre> <span class="n">webpage</span> <span
class="p">=</span> <span class="n">LOAD</span> <span
class="s">'.'</span> <span class="n">USING</span> <span
class="n">org</span><span class="p">.</span><span class="n">apache</span><span
class="p">.</span><span class="n">gora</span><span class="p">.</span><span
class="n">pig</span><span class="p">.</span><span
class="n">GoraStorage</span><span class="p">(</span><span
class="s">'{</span>
+<span class="s"> "persistentClass":
"admin.WebPage",</span>
+<span class="s"> "keyClass":
"java.lang.String",</span>
+<span class="s"> "fields": "*",</span>
+<span class="s"> "goraProperties": "",</span>
+<span class="s"> "mapping": "",</span>
+<span class="s"> "configuration": {}</span>
+<span class="s"> }'</span><span class="p">)</span> <span
class="p">;</span>
+</pre></div>
+
+
+<h3 id="full-options-for-load">Full options for LOAD<a class="headerlink"
href="#full-options-for-load" title="Permanent link">¶</a></h3>
+<p>The configuration options are the following:</p>
+<ul>
+<li><strong>persistentClass</strong> (mandatory): The full name of the
persistent class including the namespace.</li>
+<li><strong>keyClass</strong>: The full name of the key class. <strong>By now
only <code>java.lang.String</code> is supported</strong>.</li>
+<li><strong>fields</strong> (mandatory): Comma-separated list of field names
(without spaces!) or '*' to load all fields.</li>
+<li><strong>goraProperties</strong>: String with gora.properties
configuration. Each line must be separated by \n.</li>
+<li><strong>mapping</strong>: XML mapping for the entities loaded. Each line
must be separated by \n and escaped quotes as \"</li>
+<li><strong>configuration</strong>: object with a map from keys to values that
will be added to the configuration.</li>
+</ul>
+<p>In JSON Strings, line feeds must be escaped as \n.</p>
+<p>An example of Gora properties value is:</p>
+<div class="codehilite"><pre> "<span class="n">gora</span><span
class="p">.</span><span class="n">datastore</span><span class="p">.</span><span
class="n">default</span><span class="p">=</span><span class="n">org</span><span
class="p">.</span><span class="n">apache</span><span class="p">.</span><span
class="n">gora</span><span class="p">.</span><span class="n">hbase</span><span
class="p">.</span><span class="n">store</span><span class="p">.</span><span
class="n">HBaseStore</span><span class="o">\\</span><span
class="n">ngora</span><span class="p">.</span><span
class="n">datastore</span><span class="p">.</span><span
class="n">autocreateschema</span><span class="p">=</span><span
class="n">true</span><span class="o">\\</span><span class="n">ngora</span><span
class="p">.</span><span class="n">hbasestore</span><span
class="p">.</span><span class="n">scanner</span><span class="p">.</span><span
class="n">caching</span><span class="p">=</span>4"
+</pre></div>
+
+
+<p>An example of mapping is:</p>
+<div class="codehilite"><pre> "<span class="cp"><?xml
version=\\"1.0\\" encoding=\\"UTF-8\\"?></span>\\n<span
class="nt"><gora-odm></span>\\n<span class="nt"><table</span> <span
class="na">name=</span><span class="s">\\"webpage\\"</span><span
class="nt">></span>\\n<span class="nt"><family</span> <span
class="na">name=</span><span class="s">\\"f\\"</span> <span
class="na">maxVersions=</span><span class="s">\\"1\\"/</span><span
class="nt">></span>\\n<span class="nt"></table></span>\\n<span
class="nt"><class</span> <span class="na">table=</span><span
class="s">\\"webpage\\"</span> <span class="na">keyClass=</span><span
class="s">\\"java.lang.String\\"</span> <span
class="na">name=</span><span
class="s">\\"admin.WebPage\\"</span><span
class="nt">></span>\\n<span class="nt"><field</span> <span
class="na">name=</span><span class="s">\\"baseUrl\\"</span>
<span class="na">family=</span><span class="s">\\"f\\"</span> <span
class="na">qualifier=</span><span class="s">\\"bas\\"/</span><span
class="nt">></span>\\n<span class="nt"><field</span> <span
class="na">name=</span><span class="s">\\"status\\"</span> <span
class="na">family=</span><span class="s">\\"f\\"</span> <span
class="na">qualifier=</span><span class="s">\\"st\\"/</span><span
class="nt">></span>\\n<span class="nt"><field</span> <span
class="na">name=</span><span class="s">\\"content\\"</span> <span
class="na">family=</span><span class="s">\\"f\\"</span> <span
class="na">qualifier=</span><span class="s">\\"cnt\\"/</span><span
class="nt">></span>\\n<span class="nt"></class></span>\\n<span
class="nt"></gora-odm></span>"
+</pre></div>
+
+
+<p>The configuration options is a JSON object with string key-values like
this:</p>
+<div class="codehilite"><pre> <span class="p">{</span>
+ "<span class="n">hbase</span><span class="p">.</span><span
class="n">zookeeper</span><span class="p">.</span><span
class="n">quorum</span>"<span class="p">:</span> "<span
class="n">hdp4</span><span class="p">,</span><span class="n">hdp1</span><span
class="p">,</span><span class="n">hdp3</span>"<span class="p">,</span>
+ "<span class="n">zookeeper</span><span class="p">.</span><span
class="n">znode</span><span class="p">.</span><span
class="n">parent</span>"<span class="p">:</span> "<span
class="o">/</span><span class="n">hbase</span><span class="o">-</span><span
class="n">unsecure</span>"
+ <span class="p">}</span>
+</pre></div>
+
+
+<h2 id="writing-to-datastores">Writing to datastores<a class="headerlink"
href="#writing-to-datastores" title="Permanent link">¶</a></h2>
+<p>To write a Pig relation to a datastore, the command is:</p>
+<div class="codehilite"><pre> <span class="n">STORE</span> <span
class="n">webpages</span> <span class="n">INTO</span> <span
class="s">'.'</span> <span class="n">USING</span> <span
class="n">org</span><span class="p">.</span><span class="n">apache</span><span
class="p">.</span><span class="n">gora</span><span class="p">.</span><span
class="n">pig</span><span class="p">.</span><span
class="n">GoraStorage</span><span class="p">(</span><span
class="s">'{</span>
+<span class="s"> "persistentClass": "",</span>
+<span class="s"> "fields": "",</span>
+<span class="s"> "goraProperties": "",</span>
+<span class="s"> "mapping": "",</span>
+<span class="s"> "configuration": {}</span>
+<span class="s"> }'</span><span class="p">)</span> <span
class="p">;</span>
+</pre></div>
+
+
+<p>All the fields listed in "fields" will be persisted. If a field listed is
missing in the relation the process will fail with an exception. Only the
fields listed will be updated if the element already exists.</p>
+<h2 id="deleting-elements">Deleting elements<a class="headerlink"
href="#deleting-elements" title="Permanent link">¶</a></h2>
+<p>To delete elements of a collection is <code>GoraDeleteStorage</code>. Given
a relation with schema <code>(key:chararray)</code> rows, the following will
delete all rows with that keys:</p>
+<div class="codehilite"><pre> <span class="n">STORE</span> <span
class="n">webpages</span> <span class="n">INTO</span> <span
class="s">'.'</span> <span class="n">USING</span> <span
class="n">org</span><span class="p">.</span><span class="n">apache</span><span
class="p">.</span><span class="n">gora</span><span class="p">.</span><span
class="n">pig</span><span class="p">.</span><span
class="n">GoraDeleteStorage</span><span class="p">(</span><span
class="s">'{</span>
+<span class="s"> "persistentClass": "",</span>
+<span class="s"> "goraProperties": "",</span>
+<span class="s"> "mapping": "",</span>
+<span class="s"> "configuration": {}</span>
+<span class="s"> }'</span><span class="p">)</span> <span
class="p">;</span>
+</pre></div>
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