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<h1 id="spark-configuration">Spark Configuration<a class="headerlink" href="#spark-configuration" title="Permanent link">🔗</a></h1>
<h2 id="catalogs">Catalogs<a class="headerlink" href="#catalogs" title="Permanent link">🔗</a></h2>
<p>Spark adds an API to plug in table catalogs that are used to load, create, and manage Iceberg tables. Spark catalogs are configured by setting Spark properties under <code>spark.sql.catalog</code>.</p>
<p>This creates an Iceberg catalog named <code>hive_prod</code> that loads tables from a Hive metastore:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a>spark.sql.catalog.hive_prod = org.apache.iceberg.spark.SparkCatalog
<a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a>spark.sql.catalog.hive_prod.type = hive
<a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a>spark.sql.catalog.hive_prod.uri = thrift://metastore-host:port
<a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a># omit uri to use the same URI as Spark: hive.metastore.uris in hive-site.xml
</code></pre></div>
<p>Below is an example for a REST catalog named <code>rest_prod</code> that loads tables from REST URL <code>http://localhost:8080</code>:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a>spark.sql.catalog.rest_prod = org.apache.iceberg.spark.SparkCatalog
<a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a>spark.sql.catalog.rest_prod.type = rest
<a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a>spark.sql.catalog.rest_prod.uri = http://localhost:8080
</code></pre></div>
<p>Iceberg also supports a directory-based catalog in HDFS that can be configured using <code>type=hadoop</code>:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a>spark.sql.catalog.hadoop_prod = org.apache.iceberg.spark.SparkCatalog
<a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a>spark.sql.catalog.hadoop_prod.type = hadoop
<a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a>spark.sql.catalog.hadoop_prod.warehouse = hdfs://nn:8020/warehouse/path
</code></pre></div>
<div class="admonition info">
<p class="admonition-title">Info</p>
<p>The Hive-based catalog only loads Iceberg tables. To load non-Iceberg tables in the same Hive metastore, use a <a href="#replacing-the-session-catalog">session catalog</a>.</p>
</div>
<h3 id="catalog-configuration">Catalog configuration<a class="headerlink" href="#catalog-configuration" title="Permanent link">🔗</a></h3>
<p>A catalog is created and named by adding a property <code>spark.sql.catalog.(catalog-name)</code> with an implementation class for its value.</p>
<p>Iceberg supplies two implementations:</p>
<ul>
<li><code>org.apache.iceberg.spark.SparkCatalog</code> supports a Hive Metastore or a Hadoop warehouse as a catalog</li>
<li><code>org.apache.iceberg.spark.SparkSessionCatalog</code> adds support for Iceberg tables to Spark's built-in catalog, and delegates to the built-in catalog for non-Iceberg tables</li>
</ul>
<p>Both catalogs are configured using properties nested under the catalog name. Common configuration properties for Hive and Hadoop are:</p>
<table>
<thead>
<tr>
<th>Property</th>
<th>Values</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>spark.sql.catalog.<em>catalog-name</em>.type</td>
<td><code>hive</code>, <code>hadoop</code>, <code>rest</code>, <code>glue</code>, <code>jdbc</code> or <code>nessie</code></td>
<td>The underlying Iceberg catalog implementation, <code>HiveCatalog</code>, <code>HadoopCatalog</code>, <code>RESTCatalog</code>, <code>GlueCatalog</code>, <code>JdbcCatalog</code>, <code>NessieCatalog</code> or left unset if using a custom catalog</td>
</tr>
<tr>
<td>spark.sql.catalog.<em>catalog-name</em>.catalog-impl</td>
<td></td>
<td>The custom Iceberg catalog implementation. If <code>type</code> is null, <code>catalog-impl</code> must not be null.</td>
</tr>
<tr>
<td>spark.sql.catalog.<em>catalog-name</em>.io-impl</td>
<td></td>
<td>The custom FileIO implementation.</td>
</tr>
<tr>
<td>spark.sql.catalog.<em>catalog-name</em>.metrics-reporter-impl</td>
<td></td>
<td>The custom MetricsReporter implementation.</td>
</tr>
<tr>
<td>spark.sql.catalog.<em>catalog-name</em>.default-namespace</td>
<td>default</td>
<td>The default current namespace for the catalog</td>
</tr>
<tr>
<td>spark.sql.catalog.<em>catalog-name</em>.uri</td>
<td>thrift://host:port</td>
<td>Hive metastore URL for hive typed catalog, REST URL for REST typed catalog</td>
</tr>
<tr>
<td>spark.sql.catalog.<em>catalog-name</em>.warehouse</td>
<td>hdfs://nn:8020/warehouse/path</td>
<td>Base path for the warehouse directory</td>
</tr>
<tr>
<td>spark.sql.catalog.<em>catalog-name</em>.cache-enabled</td>
<td><code>true</code> or <code>false</code></td>
<td>Whether to enable catalog cache, default value is <code>true</code></td>
</tr>
<tr>
<td>spark.sql.catalog.<em>catalog-name</em>.cache.expiration-interval-ms</td>
<td><code>30000</code> (30 seconds)</td>
<td>Duration after which cached catalog entries are expired; Only effective if <code>cache-enabled</code> is <code>true</code>. <code>-1</code> disables cache expiration and <code>0</code> disables caching entirely, irrespective of <code>cache-enabled</code>. Default is <code>30000</code> (30 seconds)</td>
</tr>
<tr>
<td>spark.sql.catalog.<em>catalog-name</em>.table-default.<em>propertyKey</em></td>
<td></td>
<td>Default Iceberg table property value for property key <em>propertyKey</em>, which will be set on tables created by this catalog if not overridden</td>
</tr>
<tr>
<td>spark.sql.catalog.<em>catalog-name</em>.table-override.<em>propertyKey</em></td>
<td></td>
<td>Enforced Iceberg table property value for property key <em>propertyKey</em>, which cannot be overridden by user</td>
</tr>
</tbody>
</table>
<p>Additional properties can be found in common <a href="../../configuration/#catalog-properties">catalog configuration</a>.</p>
<h3 id="using-catalogs">Using catalogs<a class="headerlink" href="#using-catalogs" title="Permanent link">🔗</a></h3>
<p>Catalog names are used in SQL queries to identify a table. In the examples above, <code>hive_prod</code> and <code>hadoop_prod</code> can be used to prefix database and table names that will be loaded from those catalogs.</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a><span class="k">SELECT</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">hive_prod</span><span class="p">.</span><span class="n">db</span><span class="p">.</span><span class="k">table</span><span class="p">;</span><span class="w"> </span><span class="c1">-- load db.table from catalog hive_prod</span>
</code></pre></div>
<p>Spark 3 keeps track of the current catalog and namespace, which can be omitted from table names.</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a><span class="n">USE</span><span class="w"> </span><span class="n">hive_prod</span><span class="p">.</span><span class="n">db</span><span class="p">;</span>
<a id="__codelineno-4-2" name="__codelineno-4-2" href="#__codelineno-4-2"></a><span class="k">SELECT</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="k">table</span><span class="p">;</span><span class="w"> </span><span class="c1">-- load db.table from catalog hive_prod</span>
</code></pre></div>
<p>To see the current catalog and namespace, run <code>SHOW CURRENT NAMESPACE</code>.</p>
<h3 id="replacing-the-session-catalog">Replacing the session catalog<a class="headerlink" href="#replacing-the-session-catalog" title="Permanent link">🔗</a></h3>
<p>To add Iceberg table support to Spark's built-in catalog, configure <code>spark_catalog</code> to use Iceberg's <code>SparkSessionCatalog</code>.</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-5-1" name="__codelineno-5-1" href="#__codelineno-5-1"></a>spark.sql.catalog.spark_catalog = org.apache.iceberg.spark.SparkSessionCatalog
<a id="__codelineno-5-2" name="__codelineno-5-2" href="#__codelineno-5-2"></a>spark.sql.catalog.spark_catalog.type = hive
</code></pre></div>
<p>Spark's built-in catalog supports existing v1 and v2 tables tracked in a Hive Metastore. This configures Spark to use Iceberg's <code>SparkSessionCatalog</code> as a wrapper around that session catalog. When a table is not an Iceberg table, the built-in catalog will be used to load it instead.</p>
<p>This configuration can use same Hive Metastore for both Iceberg and non-Iceberg tables.</p>
<h3 id="using-catalog-specific-hadoop-configuration-values">Using catalog specific Hadoop configuration values<a class="headerlink" href="#using-catalog-specific-hadoop-configuration-values" title="Permanent link">🔗</a></h3>
<p>Similar to configuring Hadoop properties by using <code>spark.hadoop.*</code>, it's possible to set per-catalog Hadoop configuration values when using Spark by adding the property for the catalog with the prefix <code>spark.sql.catalog.(catalog-name).hadoop.*</code>. These properties will take precedence over values configured globally using <code>spark.hadoop.*</code> and will only affect Iceberg tables.</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-6-1" name="__codelineno-6-1" href="#__codelineno-6-1"></a>spark.sql.catalog.hadoop_prod.hadoop.fs.s3a.endpoint = http://aws-local:9000
</code></pre></div>
<h3 id="loading-a-custom-catalog">Loading a custom catalog<a class="headerlink" href="#loading-a-custom-catalog" title="Permanent link">🔗</a></h3>
<p>Spark supports loading a custom Iceberg <code>Catalog</code> implementation by specifying the <code>catalog-impl</code> property. Here is an example:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-7-1" name="__codelineno-7-1" href="#__codelineno-7-1"></a>spark.sql.catalog.custom_prod = org.apache.iceberg.spark.SparkCatalog
<a id="__codelineno-7-2" name="__codelineno-7-2" href="#__codelineno-7-2"></a>spark.sql.catalog.custom_prod.catalog-impl = com.my.custom.CatalogImpl
<a id="__codelineno-7-3" name="__codelineno-7-3" href="#__codelineno-7-3"></a>spark.sql.catalog.custom_prod.my-additional-catalog-config = my-value
</code></pre></div>
<h2 id="sql-extensions">SQL Extensions<a class="headerlink" href="#sql-extensions" title="Permanent link">🔗</a></h2>
<p>Iceberg 0.11.0 and later add an extension module to Spark to add new SQL commands, like <code>CALL</code> for stored procedures or <code>ALTER TABLE ... WRITE ORDERED BY</code>.</p>
<p>Using those SQL commands requires adding Iceberg extensions to your Spark environment using the following Spark property:</p>
<table>
<thead>
<tr>
<th>Spark extensions property</th>
<th>Iceberg extensions implementation</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>spark.sql.extensions</code></td>
<td><code>org.apache.iceberg.spark.extensions.IcebergSparkSessionExtensions</code></td>
</tr>
</tbody>
</table>
<h2 id="runtime-configuration">Runtime configuration<a class="headerlink" href="#runtime-configuration" title="Permanent link">🔗</a></h2>
<h3 id="read-options">Read options<a class="headerlink" href="#read-options" title="Permanent link">🔗</a></h3>
<p>Spark read options are passed when configuring the DataFrameReader, like this:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-8-1" name="__codelineno-8-1" href="#__codelineno-8-1"></a><span class="c1">// time travel</span>
<a id="__codelineno-8-2" name="__codelineno-8-2" href="#__codelineno-8-2"></a><span class="n">spark</span><span class="p">.</span><span class="n">read</span>
<a id="__codelineno-8-3" name="__codelineno-8-3" href="#__codelineno-8-3"></a><span class="w"> </span><span class="p">.</span><span class="n">option</span><span class="p">(</span><span class="s">&quot;snapshot-id&quot;</span><span class="p">,</span><span class="w"> </span><span class="il">10963874102873L</span><span class="p">)</span>
<a id="__codelineno-8-4" name="__codelineno-8-4" href="#__codelineno-8-4"></a><span class="w"> </span><span class="p">.</span><span class="n">table</span><span class="p">(</span><span class="s">&quot;catalog.db.table&quot;</span><span class="p">)</span>
</code></pre></div>
<table>
<thead>
<tr>
<th>Spark option</th>
<th>Default</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>snapshot-id</td>
<td>(latest)</td>
<td>Snapshot ID of the table snapshot to read</td>
</tr>
<tr>
<td>as-of-timestamp</td>
<td>(latest)</td>
<td>A timestamp in milliseconds; the snapshot used will be the snapshot current at this time.</td>
</tr>
<tr>
<td>split-size</td>
<td>As per table property</td>
<td>Overrides this table's read.split.target-size and read.split.metadata-target-size</td>
</tr>
<tr>
<td>lookback</td>
<td>As per table property</td>
<td>Overrides this table's read.split.planning-lookback</td>
</tr>
<tr>
<td>file-open-cost</td>
<td>As per table property</td>
<td>Overrides this table's read.split.open-file-cost</td>
</tr>
<tr>
<td>vectorization-enabled</td>
<td>As per table property</td>
<td>Overrides this table's read.parquet.vectorization.enabled</td>
</tr>
<tr>
<td>batch-size</td>
<td>As per table property</td>
<td>Overrides this table's read.parquet.vectorization.batch-size</td>
</tr>
<tr>
<td>stream-from-timestamp</td>
<td>(none)</td>
<td>A timestamp in milliseconds to stream from; if before the oldest known ancestor snapshot, the oldest will be used</td>
</tr>
</tbody>
</table>
<h3 id="write-options">Write options<a class="headerlink" href="#write-options" title="Permanent link">🔗</a></h3>
<p>Spark write options are passed when configuring the DataFrameWriter, like this:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-9-1" name="__codelineno-9-1" href="#__codelineno-9-1"></a><span class="c1">// write with Avro instead of Parquet</span>
<a id="__codelineno-9-2" name="__codelineno-9-2" href="#__codelineno-9-2"></a><span class="n">df</span><span class="p">.</span><span class="n">write</span>
<a id="__codelineno-9-3" name="__codelineno-9-3" href="#__codelineno-9-3"></a><span class="w"> </span><span class="p">.</span><span class="n">option</span><span class="p">(</span><span class="s">&quot;write-format&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;avro&quot;</span><span class="p">)</span>
<a id="__codelineno-9-4" name="__codelineno-9-4" href="#__codelineno-9-4"></a><span class="w"> </span><span class="p">.</span><span class="n">option</span><span class="p">(</span><span class="s">&quot;snapshot-property.key&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;value&quot;</span><span class="p">)</span>
<a id="__codelineno-9-5" name="__codelineno-9-5" href="#__codelineno-9-5"></a><span class="w"> </span><span class="p">.</span><span class="n">insertInto</span><span class="p">(</span><span class="s">&quot;catalog.db.table&quot;</span><span class="p">)</span>
</code></pre></div>
<table>
<thead>
<tr>
<th>Spark option</th>
<th>Default</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>write-format</td>
<td>Table write.format.default</td>
<td>File format to use for this write operation; parquet, avro, or orc</td>
</tr>
<tr>
<td>target-file-size-bytes</td>
<td>As per table property</td>
<td>Overrides this table's write.target-file-size-bytes</td>
</tr>
<tr>
<td>check-nullability</td>
<td>true</td>
<td>Sets the nullable check on fields</td>
</tr>
<tr>
<td>snapshot-property.<em>custom-key</em></td>
<td>null</td>
<td>Adds an entry with custom-key and corresponding value in the snapshot summary (the <code>snapshot-property.</code> prefix is only required for DSv2)</td>
</tr>
<tr>
<td>fanout-enabled</td>
<td>false</td>
<td>Overrides this table's write.spark.fanout.enabled</td>
</tr>
<tr>
<td>check-ordering</td>
<td>true</td>
<td>Checks if input schema and table schema are same</td>
</tr>
<tr>
<td>isolation-level</td>
<td>null</td>
<td>Desired isolation level for Dataframe overwrite operations. <code>null</code> =&gt; no checks (for idempotent writes), <code>serializable</code> =&gt; check for concurrent inserts or deletes in destination partitions, <code>snapshot</code> =&gt; checks for concurrent deletes in destination partitions.</td>
</tr>
<tr>
<td>validate-from-snapshot-id</td>
<td>null</td>
<td>If isolation level is set, id of base snapshot from which to check concurrent write conflicts into a table. Should be the snapshot before any reads from the table. Can be obtained via <a href="../../api/#table-metadata">Table API</a> or <a href="../../spark-queries/#snapshots">Snapshots table</a>. If null, the table's oldest known snapshot is used.</td>
</tr>
<tr>
<td>compression-codec</td>
<td>Table write.(fileformat).compression-codec</td>
<td>Overrides this table's compression codec for this write</td>
</tr>
<tr>
<td>compression-level</td>
<td>Table write.(fileformat).compression-level</td>
<td>Overrides this table's compression level for Parquet and Avro tables for this write</td>
</tr>
<tr>
<td>compression-strategy</td>
<td>Table write.orc.compression-strategy</td>
<td>Overrides this table's compression strategy for ORC tables for this write</td>
</tr>
</tbody>
</table>
<p>CommitMetadata provides an interface to add custom metadata to a snapshot summary during a SQL execution, which can be beneficial for purposes such as auditing or change tracking. If properties start with <code>snapshot-property.</code>, then that prefix will be removed from each property. Here is an example:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-10-1" name="__codelineno-10-1" href="#__codelineno-10-1"></a><span class="kn">import</span><span class="w"> </span><span class="nn">org.apache.iceberg.spark.CommitMetadata</span><span class="p">;</span>
<a id="__codelineno-10-2" name="__codelineno-10-2" href="#__codelineno-10-2"></a>
<a id="__codelineno-10-3" name="__codelineno-10-3" href="#__codelineno-10-3"></a><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="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Maps</span><span class="p">.</span><span class="na">newHashMap</span><span class="p">();</span>
<a id="__codelineno-10-4" name="__codelineno-10-4" href="#__codelineno-10-4"></a><span class="n">properties</span><span class="p">.</span><span class="na">put</span><span class="p">(</span><span class="s">&quot;property_key&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;property_value&quot;</span><span class="p">);</span>
<a id="__codelineno-10-5" name="__codelineno-10-5" href="#__codelineno-10-5"></a><span class="n">CommitMetadata</span><span class="p">.</span><span class="na">withCommitProperties</span><span class="p">(</span><span class="n">properties</span><span class="p">,</span>
<a id="__codelineno-10-6" name="__codelineno-10-6" href="#__codelineno-10-6"></a><span class="w"> </span><span class="p">()</span><span class="w"> </span><span class="o">-&gt;</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-10-7" name="__codelineno-10-7" href="#__codelineno-10-7"></a><span class="w"> </span><span class="n">spark</span><span class="p">.</span><span class="na">sql</span><span class="p">(</span><span class="s">&quot;DELETE FROM &quot;</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">tableName</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="s">&quot; where id = 1&quot;</span><span class="p">);</span>
<a id="__codelineno-10-8" name="__codelineno-10-8" href="#__codelineno-10-8"></a><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<a id="__codelineno-10-9" name="__codelineno-10-9" href="#__codelineno-10-9"></a><span class="w"> </span><span class="p">},</span>
<a id="__codelineno-10-10" name="__codelineno-10-10" href="#__codelineno-10-10"></a><span class="w"> </span><span class="n">RuntimeException</span><span class="p">.</span><span class="na">class</span><span class="p">);</span>
</code></pre></div>
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