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<h1 id="custom-catalog">Custom Catalog<a class="headerlink" href="#custom-catalog" title="Permanent link">🔗</a></h1>
<p>It's possible to read an iceberg table either from an hdfs path or from a hive table. It's also possible to use a custom metastore in place of hive. The steps to do that are as follows.</p>
<ul>
<li><a href="#custom-table-operations-implementation">Custom TableOperations</a></li>
<li><a href="#custom-catalog-implementation">Custom Catalog</a></li>
<li><a href="#custom-file-io-implementation">Custom FileIO</a></li>
<li><a href="#custom-location-provider-implementation">Custom LocationProvider</a></li>
<li><a href="#custom-icebergsource">Custom IcebergSource</a></li>
</ul>
<h3 id="custom-table-operations-implementation">Custom table operations implementation<a class="headerlink" href="#custom-table-operations-implementation" title="Permanent link">🔗</a></h3>
<p>Extend <code>BaseMetastoreTableOperations</code> to provide implementation on how to read and write metadata</p>
<p>Example:
<div class="highlight"><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="kd">class</span> <span class="nc">CustomTableOperations</span><span class="w"> </span><span class="kd">extends</span><span class="w"> </span><span class="n">BaseMetastoreTableOperations</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="w"> </span><span class="kd">private</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">dbName</span><span class="p">;</span>
<a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="w"> </span><span class="kd">private</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">tableName</span><span class="p">;</span>
<a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a><span class="w"> </span><span class="kd">private</span><span class="w"> </span><span class="n">Configuration</span><span class="w"> </span><span class="n">conf</span><span class="p">;</span>
<a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a><span class="w"> </span><span class="kd">private</span><span class="w"> </span><span class="n">FileIO</span><span class="w"> </span><span class="n">fileIO</span><span class="p">;</span>
<a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a>
<a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a><span class="w"> </span><span class="kd">protected</span><span class="w"> </span><span class="nf">CustomTableOperations</span><span class="p">(</span><span class="n">Configuration</span><span class="w"> </span><span class="n">conf</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">dbName</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">tableName</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a><span class="w"> </span><span class="k">this</span><span class="p">.</span><span class="na">conf</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">conf</span><span class="p">;</span>
<a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a><span class="w"> </span><span class="k">this</span><span class="p">.</span><span class="na">dbName</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">dbName</span><span class="p">;</span>
<a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a><span class="w"> </span><span class="k">this</span><span class="p">.</span><span class="na">tableName</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">tableName</span><span class="p">;</span>
<a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a>
<a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a><span class="w"> </span><span class="c1">// The doRefresh method should provide implementation on how to get the metadata location</span>
<a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></a><span class="w"> </span><span class="nd">@Override</span>
<a id="__codelineno-0-15" name="__codelineno-0-15" href="#__codelineno-0-15"></a><span class="w"> </span><span class="kd">public</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">doRefresh</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-0-16" name="__codelineno-0-16" href="#__codelineno-0-16"></a>
<a id="__codelineno-0-17" name="__codelineno-0-17" href="#__codelineno-0-17"></a><span class="w"> </span><span class="c1">// Example custom service which returns the metadata location given a dbName and tableName</span>
<a id="__codelineno-0-18" name="__codelineno-0-18" href="#__codelineno-0-18"></a><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">metadataLocation</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">CustomService</span><span class="p">.</span><span class="na">getMetadataForTable</span><span class="p">(</span><span class="n">conf</span><span class="p">,</span><span class="w"> </span><span class="n">dbName</span><span class="p">,</span><span class="w"> </span><span class="n">tableName</span><span class="p">);</span>
<a id="__codelineno-0-19" name="__codelineno-0-19" href="#__codelineno-0-19"></a>
<a id="__codelineno-0-20" name="__codelineno-0-20" href="#__codelineno-0-20"></a><span class="w"> </span><span class="c1">// When updating from a metadata file location, call the helper method</span>
<a id="__codelineno-0-21" name="__codelineno-0-21" href="#__codelineno-0-21"></a><span class="w"> </span><span class="n">refreshFromMetadataLocation</span><span class="p">(</span><span class="n">metadataLocation</span><span class="p">);</span>
<a id="__codelineno-0-22" name="__codelineno-0-22" href="#__codelineno-0-22"></a>
<a id="__codelineno-0-23" name="__codelineno-0-23" href="#__codelineno-0-23"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-0-24" name="__codelineno-0-24" href="#__codelineno-0-24"></a>
<a id="__codelineno-0-25" name="__codelineno-0-25" href="#__codelineno-0-25"></a><span class="w"> </span><span class="c1">// The doCommit method should provide implementation on how to update with metadata location atomically</span>
<a id="__codelineno-0-26" name="__codelineno-0-26" href="#__codelineno-0-26"></a><span class="w"> </span><span class="nd">@Override</span>
<a id="__codelineno-0-27" name="__codelineno-0-27" href="#__codelineno-0-27"></a><span class="w"> </span><span class="kd">public</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">doCommit</span><span class="p">(</span><span class="n">TableMetadata</span><span class="w"> </span><span class="n">base</span><span class="p">,</span><span class="w"> </span><span class="n">TableMetadata</span><span class="w"> </span><span class="n">metadata</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-0-28" name="__codelineno-0-28" href="#__codelineno-0-28"></a><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">oldMetadataLocation</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">base</span><span class="p">.</span><span class="na">location</span><span class="p">();</span>
<a id="__codelineno-0-29" name="__codelineno-0-29" href="#__codelineno-0-29"></a>
<a id="__codelineno-0-30" name="__codelineno-0-30" href="#__codelineno-0-30"></a><span class="w"> </span><span class="c1">// Write new metadata using helper method</span>
<a id="__codelineno-0-31" name="__codelineno-0-31" href="#__codelineno-0-31"></a><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">newMetadataLocation</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">writeNewMetadata</span><span class="p">(</span><span class="n">metadata</span><span class="p">,</span><span class="w"> </span><span class="n">currentVersion</span><span class="p">()</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="mi">1</span><span class="p">);</span>
<a id="__codelineno-0-32" name="__codelineno-0-32" href="#__codelineno-0-32"></a>
<a id="__codelineno-0-33" name="__codelineno-0-33" href="#__codelineno-0-33"></a><span class="w"> </span><span class="c1">// Example custom service which updates the metadata location for the given db and table atomically</span>
<a id="__codelineno-0-34" name="__codelineno-0-34" href="#__codelineno-0-34"></a><span class="w"> </span><span class="n">CustomService</span><span class="p">.</span><span class="na">updateMetadataLocation</span><span class="p">(</span><span class="n">dbName</span><span class="p">,</span><span class="w"> </span><span class="n">tableName</span><span class="p">,</span><span class="w"> </span><span class="n">oldMetadataLocation</span><span class="p">,</span><span class="w"> </span><span class="n">newMetadataLocation</span><span class="p">);</span>
<a id="__codelineno-0-35" name="__codelineno-0-35" href="#__codelineno-0-35"></a>
<a id="__codelineno-0-36" name="__codelineno-0-36" href="#__codelineno-0-36"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-0-37" name="__codelineno-0-37" href="#__codelineno-0-37"></a>
<a id="__codelineno-0-38" name="__codelineno-0-38" href="#__codelineno-0-38"></a><span class="w"> </span><span class="c1">// The io method provides a FileIO which is used to read and write the table metadata files</span>
<a id="__codelineno-0-39" name="__codelineno-0-39" href="#__codelineno-0-39"></a><span class="w"> </span><span class="nd">@Override</span>
<a id="__codelineno-0-40" name="__codelineno-0-40" href="#__codelineno-0-40"></a><span class="w"> </span><span class="kd">public</span><span class="w"> </span><span class="n">FileIO</span><span class="w"> </span><span class="nf">io</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-0-41" name="__codelineno-0-41" href="#__codelineno-0-41"></a><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">fileIO</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="kc">null</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-0-42" name="__codelineno-0-42" href="#__codelineno-0-42"></a><span class="w"> </span><span class="n">fileIO</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">HadoopFileIO</span><span class="p">(</span><span class="n">conf</span><span class="p">);</span>
<a id="__codelineno-0-43" name="__codelineno-0-43" href="#__codelineno-0-43"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-0-44" name="__codelineno-0-44" href="#__codelineno-0-44"></a><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">fileIO</span><span class="p">;</span>
<a id="__codelineno-0-45" name="__codelineno-0-45" href="#__codelineno-0-45"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-0-46" name="__codelineno-0-46" href="#__codelineno-0-46"></a><span class="p">}</span>
</code></pre></div></p>
<p>A <code>TableOperations</code> instance is usually obtained by calling <code>Catalog.newTableOps(TableIdentifier)</code>.
See the next section about implementing and loading a custom catalog.</p>
<h3 id="custom-catalog-implementation">Custom catalog implementation<a class="headerlink" href="#custom-catalog-implementation" title="Permanent link">🔗</a></h3>
<p>Extend <code>BaseMetastoreCatalog</code> to provide default warehouse locations and instantiate <code>CustomTableOperations</code></p>
<p>Example:
<div class="highlight"><pre><span></span><code><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="kd">public</span><span class="w"> </span><span class="kd">class</span> <span class="nc">CustomCatalog</span><span class="w"> </span><span class="kd">extends</span><span class="w"> </span><span class="n">BaseMetastoreCatalog</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a>
<a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="w"> </span><span class="kd">private</span><span class="w"> </span><span class="n">Configuration</span><span class="w"> </span><span class="n">configuration</span><span class="p">;</span>
<a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a>
<a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a><span class="w"> </span><span class="c1">// must have a no-arg constructor to be dynamically loaded</span>
<a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a><span class="w"> </span><span class="c1">// initialize(String name, Map&lt;String, String&gt; properties) will be called to complete initialization</span>
<a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a><span class="w"> </span><span class="kd">public</span><span class="w"> </span><span class="nf">CustomCatalog</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-1-8" name="__codelineno-1-8" href="#__codelineno-1-8"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-1-9" name="__codelineno-1-9" href="#__codelineno-1-9"></a>
<a id="__codelineno-1-10" name="__codelineno-1-10" href="#__codelineno-1-10"></a><span class="w"> </span><span class="kd">public</span><span class="w"> </span><span class="nf">CustomCatalog</span><span class="p">(</span><span class="n">Configuration</span><span class="w"> </span><span class="n">configuration</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-1-11" name="__codelineno-1-11" href="#__codelineno-1-11"></a><span class="w"> </span><span class="k">this</span><span class="p">.</span><span class="na">configuration</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">configuration</span><span class="p">;</span>
<a id="__codelineno-1-12" name="__codelineno-1-12" href="#__codelineno-1-12"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-1-13" name="__codelineno-1-13" href="#__codelineno-1-13"></a>
<a id="__codelineno-1-14" name="__codelineno-1-14" href="#__codelineno-1-14"></a><span class="w"> </span><span class="nd">@Override</span>
<a id="__codelineno-1-15" name="__codelineno-1-15" href="#__codelineno-1-15"></a><span class="w"> </span><span class="kd">protected</span><span class="w"> </span><span class="n">TableOperations</span><span class="w"> </span><span class="nf">newTableOps</span><span class="p">(</span><span class="n">TableIdentifier</span><span class="w"> </span><span class="n">tableIdentifier</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-1-16" name="__codelineno-1-16" href="#__codelineno-1-16"></a><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">dbName</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">tableIdentifier</span><span class="p">.</span><span class="na">namespace</span><span class="p">().</span><span class="na">level</span><span class="p">(</span><span class="mi">0</span><span class="p">);</span>
<a id="__codelineno-1-17" name="__codelineno-1-17" href="#__codelineno-1-17"></a><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">tableName</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">tableIdentifier</span><span class="p">.</span><span class="na">name</span><span class="p">();</span>
<a id="__codelineno-1-18" name="__codelineno-1-18" href="#__codelineno-1-18"></a><span class="w"> </span><span class="c1">// instantiate the CustomTableOperations</span>
<a id="__codelineno-1-19" name="__codelineno-1-19" href="#__codelineno-1-19"></a><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">CustomTableOperations</span><span class="p">(</span><span class="n">configuration</span><span class="p">,</span><span class="w"> </span><span class="n">dbName</span><span class="p">,</span><span class="w"> </span><span class="n">tableName</span><span class="p">);</span>
<a id="__codelineno-1-20" name="__codelineno-1-20" href="#__codelineno-1-20"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-1-21" name="__codelineno-1-21" href="#__codelineno-1-21"></a>
<a id="__codelineno-1-22" name="__codelineno-1-22" href="#__codelineno-1-22"></a><span class="w"> </span><span class="nd">@Override</span>
<a id="__codelineno-1-23" name="__codelineno-1-23" href="#__codelineno-1-23"></a><span class="w"> </span><span class="kd">protected</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="nf">defaultWarehouseLocation</span><span class="p">(</span><span class="n">TableIdentifier</span><span class="w"> </span><span class="n">tableIdentifier</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-1-24" name="__codelineno-1-24" href="#__codelineno-1-24"></a>
<a id="__codelineno-1-25" name="__codelineno-1-25" href="#__codelineno-1-25"></a><span class="w"> </span><span class="c1">// Can choose to use any other configuration name</span>
<a id="__codelineno-1-26" name="__codelineno-1-26" href="#__codelineno-1-26"></a><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">tableLocation</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">configuration</span><span class="p">.</span><span class="na">get</span><span class="p">(</span><span class="s">&quot;custom.iceberg.warehouse.location&quot;</span><span class="p">);</span>
<a id="__codelineno-1-27" name="__codelineno-1-27" href="#__codelineno-1-27"></a>
<a id="__codelineno-1-28" name="__codelineno-1-28" href="#__codelineno-1-28"></a><span class="w"> </span><span class="c1">// Can be an s3 or hdfs path</span>
<a id="__codelineno-1-29" name="__codelineno-1-29" href="#__codelineno-1-29"></a><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">tableLocation</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="kc">null</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-1-30" name="__codelineno-1-30" href="#__codelineno-1-30"></a><span class="w"> </span><span class="k">throw</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">RuntimeException</span><span class="p">(</span><span class="s">&quot;custom.iceberg.warehouse.location configuration not set!&quot;</span><span class="p">);</span>
<a id="__codelineno-1-31" name="__codelineno-1-31" href="#__codelineno-1-31"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-1-32" name="__codelineno-1-32" href="#__codelineno-1-32"></a>
<a id="__codelineno-1-33" name="__codelineno-1-33" href="#__codelineno-1-33"></a><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">String</span><span class="p">.</span><span class="na">format</span><span class="p">(</span>
<a id="__codelineno-1-34" name="__codelineno-1-34" href="#__codelineno-1-34"></a><span class="w"> </span><span class="s">&quot;%s/%s.db/%s&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">tableLocation</span><span class="p">,</span>
<a id="__codelineno-1-35" name="__codelineno-1-35" href="#__codelineno-1-35"></a><span class="w"> </span><span class="n">tableIdentifier</span><span class="p">.</span><span class="na">namespace</span><span class="p">().</span><span class="na">levels</span><span class="p">()</span><span class="o">[</span><span class="mi">0</span><span class="o">]</span><span class="p">,</span>
<a id="__codelineno-1-36" name="__codelineno-1-36" href="#__codelineno-1-36"></a><span class="w"> </span><span class="n">tableIdentifier</span><span class="p">.</span><span class="na">name</span><span class="p">());</span>
<a id="__codelineno-1-37" name="__codelineno-1-37" href="#__codelineno-1-37"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-1-38" name="__codelineno-1-38" href="#__codelineno-1-38"></a>
<a id="__codelineno-1-39" name="__codelineno-1-39" href="#__codelineno-1-39"></a><span class="w"> </span><span class="nd">@Override</span>
<a id="__codelineno-1-40" name="__codelineno-1-40" href="#__codelineno-1-40"></a><span class="w"> </span><span class="kd">public</span><span class="w"> </span><span class="kt">boolean</span><span class="w"> </span><span class="nf">dropTable</span><span class="p">(</span><span class="n">TableIdentifier</span><span class="w"> </span><span class="n">identifier</span><span class="p">,</span><span class="w"> </span><span class="kt">boolean</span><span class="w"> </span><span class="n">purge</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-1-41" name="__codelineno-1-41" href="#__codelineno-1-41"></a><span class="w"> </span><span class="c1">// Example service to delete table</span>
<a id="__codelineno-1-42" name="__codelineno-1-42" href="#__codelineno-1-42"></a><span class="w"> </span><span class="n">CustomService</span><span class="p">.</span><span class="na">deleteTable</span><span class="p">(</span><span class="n">identifier</span><span class="p">.</span><span class="na">namespace</span><span class="p">().</span><span class="na">level</span><span class="p">(</span><span class="mi">0</span><span class="p">),</span><span class="w"> </span><span class="n">identifier</span><span class="p">.</span><span class="na">name</span><span class="p">());</span>
<a id="__codelineno-1-43" name="__codelineno-1-43" href="#__codelineno-1-43"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-1-44" name="__codelineno-1-44" href="#__codelineno-1-44"></a>
<a id="__codelineno-1-45" name="__codelineno-1-45" href="#__codelineno-1-45"></a><span class="w"> </span><span class="nd">@Override</span>
<a id="__codelineno-1-46" name="__codelineno-1-46" href="#__codelineno-1-46"></a><span class="w"> </span><span class="kd">public</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">renameTable</span><span class="p">(</span><span class="n">TableIdentifier</span><span class="w"> </span><span class="n">from</span><span class="p">,</span><span class="w"> </span><span class="n">TableIdentifier</span><span class="w"> </span><span class="n">to</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-1-47" name="__codelineno-1-47" href="#__codelineno-1-47"></a><span class="w"> </span><span class="n">Preconditions</span><span class="p">.</span><span class="na">checkArgument</span><span class="p">(</span><span class="n">from</span><span class="p">.</span><span class="na">namespace</span><span class="p">().</span><span class="na">level</span><span class="p">(</span><span class="mi">0</span><span class="p">).</span><span class="na">equals</span><span class="p">(</span><span class="n">to</span><span class="p">.</span><span class="na">namespace</span><span class="p">().</span><span class="na">level</span><span class="p">(</span><span class="mi">0</span><span class="p">)),</span>
<a id="__codelineno-1-48" name="__codelineno-1-48" href="#__codelineno-1-48"></a><span class="w"> </span><span class="s">&quot;Cannot move table between databases&quot;</span><span class="p">);</span>
<a id="__codelineno-1-49" name="__codelineno-1-49" href="#__codelineno-1-49"></a><span class="w"> </span><span class="c1">// Example service to rename table</span>
<a id="__codelineno-1-50" name="__codelineno-1-50" href="#__codelineno-1-50"></a><span class="w"> </span><span class="n">CustomService</span><span class="p">.</span><span class="na">renameTable</span><span class="p">(</span><span class="n">from</span><span class="p">.</span><span class="na">namespace</span><span class="p">().</span><span class="na">level</span><span class="p">(</span><span class="mi">0</span><span class="p">),</span><span class="w"> </span><span class="n">from</span><span class="p">.</span><span class="na">name</span><span class="p">(),</span><span class="w"> </span><span class="n">to</span><span class="p">.</span><span class="na">name</span><span class="p">());</span>
<a id="__codelineno-1-51" name="__codelineno-1-51" href="#__codelineno-1-51"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-1-52" name="__codelineno-1-52" href="#__codelineno-1-52"></a>
<a id="__codelineno-1-53" name="__codelineno-1-53" href="#__codelineno-1-53"></a><span class="w"> </span><span class="c1">// implement this method to read catalog name and properties during initialization</span>
<a id="__codelineno-1-54" name="__codelineno-1-54" href="#__codelineno-1-54"></a><span class="w"> </span><span class="kd">public</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">initialize</span><span class="p">(</span><span class="n">String</span><span class="w"> </span><span class="n">name</span><span class="p">,</span><span class="w"> </span><span class="n">Map</span><span class="o">&lt;</span><span class="n">String</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="o">&gt;</span><span class="w"> </span><span class="n">properties</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-1-55" name="__codelineno-1-55" href="#__codelineno-1-55"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-1-56" name="__codelineno-1-56" href="#__codelineno-1-56"></a><span class="p">}</span>
</code></pre></div></p>
<p>Catalog implementations can be dynamically loaded in most compute engines.
For Spark and Flink, you can specify the <code>catalog-impl</code> catalog property to load it.
Read the <a href="../configuration/#catalog-properties">Configuration</a> section for more details.
For MapReduce, implement <code>org.apache.iceberg.mr.CatalogLoader</code> and set Hadoop property <code>iceberg.mr.catalog.loader.class</code> to load it.
If your catalog must read Hadoop configuration to access certain environment properties, make your catalog implement <code>org.apache.hadoop.conf.Configurable</code>.</p>
<h3 id="custom-file-io-implementation">Custom file IO implementation<a class="headerlink" href="#custom-file-io-implementation" title="Permanent link">🔗</a></h3>
<p>Extend <code>FileIO</code> and provide implementation to read and write data files</p>
<p>Example:
<div class="highlight"><pre><span></span><code><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="kd">public</span><span class="w"> </span><span class="kd">class</span> <span class="nc">CustomFileIO</span><span class="w"> </span><span class="kd">implements</span><span class="w"> </span><span class="n">FileIO</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a>
<a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a><span class="w"> </span><span class="c1">// must have a no-arg constructor to be dynamically loaded</span>
<a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a><span class="w"> </span><span class="c1">// initialize(Map&lt;String, String&gt; properties) will be called to complete initialization</span>
<a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a><span class="w"> </span><span class="kd">public</span><span class="w"> </span><span class="nf">CustomFileIO</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a>
<a id="__codelineno-2-8" name="__codelineno-2-8" href="#__codelineno-2-8"></a><span class="w"> </span><span class="nd">@Override</span>
<a id="__codelineno-2-9" name="__codelineno-2-9" href="#__codelineno-2-9"></a><span class="w"> </span><span class="kd">public</span><span class="w"> </span><span class="n">InputFile</span><span class="w"> </span><span class="nf">newInputFile</span><span class="p">(</span><span class="n">String</span><span class="w"> </span><span class="n">s</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-2-10" name="__codelineno-2-10" href="#__codelineno-2-10"></a><span class="w"> </span><span class="c1">// you also need to implement the InputFile interface for a custom input file</span>
<a id="__codelineno-2-11" name="__codelineno-2-11" href="#__codelineno-2-11"></a><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">CustomInputFile</span><span class="p">(</span><span class="n">s</span><span class="p">);</span>
<a id="__codelineno-2-12" name="__codelineno-2-12" href="#__codelineno-2-12"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-2-13" name="__codelineno-2-13" href="#__codelineno-2-13"></a>
<a id="__codelineno-2-14" name="__codelineno-2-14" href="#__codelineno-2-14"></a><span class="w"> </span><span class="nd">@Override</span>
<a id="__codelineno-2-15" name="__codelineno-2-15" href="#__codelineno-2-15"></a><span class="w"> </span><span class="kd">public</span><span class="w"> </span><span class="n">OutputFile</span><span class="w"> </span><span class="nf">newOutputFile</span><span class="p">(</span><span class="n">String</span><span class="w"> </span><span class="n">s</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-2-16" name="__codelineno-2-16" href="#__codelineno-2-16"></a><span class="w"> </span><span class="c1">// you also need to implement the OutputFile interface for a custom output file</span>
<a id="__codelineno-2-17" name="__codelineno-2-17" href="#__codelineno-2-17"></a><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">CustomOutputFile</span><span class="p">(</span><span class="n">s</span><span class="p">);</span>
<a id="__codelineno-2-18" name="__codelineno-2-18" href="#__codelineno-2-18"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-2-19" name="__codelineno-2-19" href="#__codelineno-2-19"></a>
<a id="__codelineno-2-20" name="__codelineno-2-20" href="#__codelineno-2-20"></a><span class="w"> </span><span class="nd">@Override</span>
<a id="__codelineno-2-21" name="__codelineno-2-21" href="#__codelineno-2-21"></a><span class="w"> </span><span class="kd">public</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">deleteFile</span><span class="p">(</span><span class="n">String</span><span class="w"> </span><span class="n">path</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-2-22" name="__codelineno-2-22" href="#__codelineno-2-22"></a><span class="w"> </span><span class="n">Path</span><span class="w"> </span><span class="n">toDelete</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">Path</span><span class="p">(</span><span class="n">path</span><span class="p">);</span>
<a id="__codelineno-2-23" name="__codelineno-2-23" href="#__codelineno-2-23"></a><span class="w"> </span><span class="n">FileSystem</span><span class="w"> </span><span class="n">fs</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Util</span><span class="p">.</span><span class="na">getFs</span><span class="p">(</span><span class="n">toDelete</span><span class="p">);</span>
<a id="__codelineno-2-24" name="__codelineno-2-24" href="#__codelineno-2-24"></a><span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-2-25" name="__codelineno-2-25" href="#__codelineno-2-25"></a><span class="w"> </span><span class="n">fs</span><span class="p">.</span><span class="na">delete</span><span class="p">(</span><span class="n">toDelete</span><span class="p">,</span><span class="w"> </span><span class="kc">false</span><span class="w"> </span><span class="cm">/* not recursive */</span><span class="p">);</span>
<a id="__codelineno-2-26" name="__codelineno-2-26" href="#__codelineno-2-26"></a><span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="k">catch</span><span class="w"> </span><span class="p">(</span><span class="n">IOException</span><span class="w"> </span><span class="n">e</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-2-27" name="__codelineno-2-27" href="#__codelineno-2-27"></a><span class="w"> </span><span class="k">throw</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">RuntimeIOException</span><span class="p">(</span><span class="n">e</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;Failed to delete file: %s&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">path</span><span class="p">);</span>
<a id="__codelineno-2-28" name="__codelineno-2-28" href="#__codelineno-2-28"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-2-29" name="__codelineno-2-29" href="#__codelineno-2-29"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-2-30" name="__codelineno-2-30" href="#__codelineno-2-30"></a>
<a id="__codelineno-2-31" name="__codelineno-2-31" href="#__codelineno-2-31"></a><span class="w"> </span><span class="c1">// implement this method to read catalog properties during initialization</span>
<a id="__codelineno-2-32" name="__codelineno-2-32" href="#__codelineno-2-32"></a><span class="w"> </span><span class="kd">public</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">initialize</span><span class="p">(</span><span class="n">Map</span><span class="o">&lt;</span><span class="n">String</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="o">&gt;</span><span class="w"> </span><span class="n">properties</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-2-33" name="__codelineno-2-33" href="#__codelineno-2-33"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-2-34" name="__codelineno-2-34" href="#__codelineno-2-34"></a><span class="p">}</span>
</code></pre></div></p>
<p>If you are already implementing your own catalog, you can implement <code>TableOperations.io()</code> to use your custom <code>FileIO</code>.
In addition, custom <code>FileIO</code> implementations can also be dynamically loaded in <code>HadoopCatalog</code> and <code>HiveCatalog</code> by specifying the <code>io-impl</code> catalog property.
Read the <a href="../configuration/#catalog-properties">Configuration</a> section for more details.
If your <code>FileIO</code> must read Hadoop configuration to access certain environment properties, make your <code>FileIO</code> implement <code>org.apache.hadoop.conf.Configurable</code>.</p>
<h3 id="custom-location-provider-implementation">Custom location provider implementation<a class="headerlink" href="#custom-location-provider-implementation" title="Permanent link">🔗</a></h3>
<p>Extend <code>LocationProvider</code> and provide implementation to determine the file path to write data</p>
<p>Example:
<div class="highlight"><pre><span></span><code><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a><span class="kd">public</span><span class="w"> </span><span class="kd">class</span> <span class="nc">CustomLocationProvider</span><span class="w"> </span><span class="kd">implements</span><span class="w"> </span><span class="n">LocationProvider</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a>
<a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a><span class="w"> </span><span class="kd">private</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">tableLocation</span><span class="p">;</span>
<a id="__codelineno-3-4" name="__codelineno-3-4" href="#__codelineno-3-4"></a>
<a id="__codelineno-3-5" name="__codelineno-3-5" href="#__codelineno-3-5"></a><span class="w"> </span><span class="c1">// must have a 2-arg constructor like this, or a no-arg constructor</span>
<a id="__codelineno-3-6" name="__codelineno-3-6" href="#__codelineno-3-6"></a><span class="w"> </span><span class="kd">public</span><span class="w"> </span><span class="nf">CustomLocationProvider</span><span class="p">(</span><span class="n">String</span><span class="w"> </span><span class="n">tableLocation</span><span class="p">,</span><span class="w"> </span><span class="n">Map</span><span class="o">&lt;</span><span class="n">String</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="o">&gt;</span><span class="w"> </span><span class="n">properties</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-3-7" name="__codelineno-3-7" href="#__codelineno-3-7"></a><span class="w"> </span><span class="k">this</span><span class="p">.</span><span class="na">tableLocation</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">tableLocation</span><span class="p">;</span>
<a id="__codelineno-3-8" name="__codelineno-3-8" href="#__codelineno-3-8"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-3-9" name="__codelineno-3-9" href="#__codelineno-3-9"></a>
<a id="__codelineno-3-10" name="__codelineno-3-10" href="#__codelineno-3-10"></a><span class="w"> </span><span class="nd">@Override</span>
<a id="__codelineno-3-11" name="__codelineno-3-11" href="#__codelineno-3-11"></a><span class="w"> </span><span class="kd">public</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="nf">newDataLocation</span><span class="p">(</span><span class="n">String</span><span class="w"> </span><span class="n">filename</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-3-12" name="__codelineno-3-12" href="#__codelineno-3-12"></a><span class="w"> </span><span class="c1">// can use any custom method to generate a file path given a file name</span>
<a id="__codelineno-3-13" name="__codelineno-3-13" href="#__codelineno-3-13"></a><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">String</span><span class="p">.</span><span class="na">format</span><span class="p">(</span><span class="s">&quot;%s/%s/%s&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">tableLocation</span><span class="p">,</span><span class="w"> </span><span class="n">UUID</span><span class="p">.</span><span class="na">randomUUID</span><span class="p">().</span><span class="na">toString</span><span class="p">(),</span><span class="w"> </span><span class="n">filename</span><span class="p">);</span>
<a id="__codelineno-3-14" name="__codelineno-3-14" href="#__codelineno-3-14"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-3-15" name="__codelineno-3-15" href="#__codelineno-3-15"></a>
<a id="__codelineno-3-16" name="__codelineno-3-16" href="#__codelineno-3-16"></a><span class="w"> </span><span class="nd">@Override</span>
<a id="__codelineno-3-17" name="__codelineno-3-17" href="#__codelineno-3-17"></a><span class="w"> </span><span class="kd">public</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="nf">newDataLocation</span><span class="p">(</span><span class="n">PartitionSpec</span><span class="w"> </span><span class="n">spec</span><span class="p">,</span><span class="w"> </span><span class="n">StructLike</span><span class="w"> </span><span class="n">partitionData</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">filename</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-3-18" name="__codelineno-3-18" href="#__codelineno-3-18"></a><span class="w"> </span><span class="c1">// can use any custom method to generate a file path given a partition info and file name</span>
<a id="__codelineno-3-19" name="__codelineno-3-19" href="#__codelineno-3-19"></a><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">newDataLocation</span><span class="p">(</span><span class="n">filename</span><span class="p">);</span>
<a id="__codelineno-3-20" name="__codelineno-3-20" href="#__codelineno-3-20"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-3-21" name="__codelineno-3-21" href="#__codelineno-3-21"></a><span class="p">}</span>
</code></pre></div></p>
<p>If you are already implementing your own catalog, you can override <code>TableOperations.locationProvider()</code> to use your custom default <code>LocationProvider</code>.
To use a different custom location provider for a specific table, specify the implementation when creating the table using table property <code>write.location-provider.impl</code></p>
<p>Example:
<div class="highlight"><pre><span></span><code><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a><span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">hive</span><span class="p">.</span><span class="k">default</span><span class="p">.</span><span class="n">my_table</span><span class="w"> </span><span class="p">(</span>
<a id="__codelineno-4-2" name="__codelineno-4-2" href="#__codelineno-4-2"></a><span class="w"> </span><span class="n">id</span><span class="w"> </span><span class="nb">bigint</span><span class="p">,</span>
<a id="__codelineno-4-3" name="__codelineno-4-3" href="#__codelineno-4-3"></a><span class="w"> </span><span class="k">data</span><span class="w"> </span><span class="n">string</span><span class="p">,</span>
<a id="__codelineno-4-4" name="__codelineno-4-4" href="#__codelineno-4-4"></a><span class="w"> </span><span class="n">category</span><span class="w"> </span><span class="n">string</span><span class="p">)</span>
<a id="__codelineno-4-5" name="__codelineno-4-5" href="#__codelineno-4-5"></a><span class="k">USING</span><span class="w"> </span><span class="n">iceberg</span>
<a id="__codelineno-4-6" name="__codelineno-4-6" href="#__codelineno-4-6"></a><span class="k">OPTIONS</span><span class="w"> </span><span class="p">(</span>
<a id="__codelineno-4-7" name="__codelineno-4-7" href="#__codelineno-4-7"></a><span class="w"> </span><span class="s1">&#39;write.location-provider.impl&#39;</span><span class="o">=</span><span class="s1">&#39;com.my.CustomLocationProvider&#39;</span>
<a id="__codelineno-4-8" name="__codelineno-4-8" href="#__codelineno-4-8"></a><span class="p">)</span>
<a id="__codelineno-4-9" name="__codelineno-4-9" href="#__codelineno-4-9"></a><span class="n">PARTITIONED</span><span class="w"> </span><span class="k">BY</span><span class="w"> </span><span class="p">(</span><span class="n">category</span><span class="p">);</span>
</code></pre></div></p>
<h3 id="custom-icebergsource">Custom IcebergSource<a class="headerlink" href="#custom-icebergsource" title="Permanent link">🔗</a></h3>
<p>Extend <code>IcebergSource</code> and provide implementation to read from <code>CustomCatalog</code></p>
<p>Example:
<div class="highlight"><pre><span></span><code><a id="__codelineno-5-1" name="__codelineno-5-1" href="#__codelineno-5-1"></a><span class="kd">public</span><span class="w"> </span><span class="kd">class</span> <span class="nc">CustomIcebergSource</span><span class="w"> </span><span class="kd">extends</span><span class="w"> </span><span class="n">IcebergSource</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-5-2" name="__codelineno-5-2" href="#__codelineno-5-2"></a>
<a id="__codelineno-5-3" name="__codelineno-5-3" href="#__codelineno-5-3"></a><span class="w"> </span><span class="nd">@Override</span>
<a id="__codelineno-5-4" name="__codelineno-5-4" href="#__codelineno-5-4"></a><span class="w"> </span><span class="kd">protected</span><span class="w"> </span><span class="n">Table</span><span class="w"> </span><span class="nf">findTable</span><span class="p">(</span><span class="n">DataSourceOptions</span><span class="w"> </span><span class="n">options</span><span class="p">,</span><span class="w"> </span><span class="n">Configuration</span><span class="w"> </span><span class="n">conf</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-5-5" name="__codelineno-5-5" href="#__codelineno-5-5"></a><span class="w"> </span><span class="n">Optional</span><span class="o">&lt;</span><span class="n">String</span><span class="o">&gt;</span><span class="w"> </span><span class="n">path</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">options</span><span class="p">.</span><span class="na">get</span><span class="p">(</span><span class="s">&quot;path&quot;</span><span class="p">);</span>
<a id="__codelineno-5-6" name="__codelineno-5-6" href="#__codelineno-5-6"></a><span class="w"> </span><span class="n">Preconditions</span><span class="p">.</span><span class="na">checkArgument</span><span class="p">(</span><span class="n">path</span><span class="p">.</span><span class="na">isPresent</span><span class="p">(),</span><span class="w"> </span><span class="s">&quot;Cannot open table: path is not set&quot;</span><span class="p">);</span>
<a id="__codelineno-5-7" name="__codelineno-5-7" href="#__codelineno-5-7"></a>
<a id="__codelineno-5-8" name="__codelineno-5-8" href="#__codelineno-5-8"></a><span class="w"> </span><span class="c1">// Read table from CustomCatalog</span>
<a id="__codelineno-5-9" name="__codelineno-5-9" href="#__codelineno-5-9"></a><span class="w"> </span><span class="n">CustomCatalog</span><span class="w"> </span><span class="n">catalog</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">CustomCatalog</span><span class="p">(</span><span class="n">conf</span><span class="p">);</span>
<a id="__codelineno-5-10" name="__codelineno-5-10" href="#__codelineno-5-10"></a><span class="w"> </span><span class="n">TableIdentifier</span><span class="w"> </span><span class="n">tableIdentifier</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">TableIdentifier</span><span class="p">.</span><span class="na">parse</span><span class="p">(</span><span class="n">path</span><span class="p">.</span><span class="na">get</span><span class="p">());</span>
<a id="__codelineno-5-11" name="__codelineno-5-11" href="#__codelineno-5-11"></a><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">catalog</span><span class="p">.</span><span class="na">loadTable</span><span class="p">(</span><span class="n">tableIdentifier</span><span class="p">);</span>
<a id="__codelineno-5-12" name="__codelineno-5-12" href="#__codelineno-5-12"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-5-13" name="__codelineno-5-13" href="#__codelineno-5-13"></a><span class="p">}</span>
</code></pre></div></p>
<p>Register the <code>CustomIcebergSource</code> by updating <code>META-INF/services/org.apache.spark.sql.sources.DataSourceRegister</code> with its fully qualified name</p>
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