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-->
<h1 id="java-api-quickstart">Java API Quickstart<a class="headerlink" href="#java-api-quickstart" title="Permanent link">🔗</a></h1>
<h2 id="create-a-table">Create a table<a class="headerlink" href="#create-a-table" title="Permanent link">🔗</a></h2>
<p>Tables are created using either a <a href="../../../javadoc/1.5.2/?org/apache/iceberg/catalog/Catalog.html"><code>Catalog</code></a> or an implementation of the <a href="../../../javadoc/1.5.2/?org/apache/iceberg/Tables.html"><code>Tables</code></a> interface.</p>
<h3 id="using-a-hive-catalog">Using a Hive catalog<a class="headerlink" href="#using-a-hive-catalog" title="Permanent link">🔗</a></h3>
<p>The Hive catalog connects to a Hive metastore to keep track of Iceberg tables.
You can initialize a Hive catalog with a name and some properties.
(see: <a href="../configuration/#catalog-properties">Catalog properties</a>)</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="kn">import</span><span class="w"> </span><span class="nn">java.util.HashMap</span>
<a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="kn">import</span><span class="w"> </span><span class="nn">java.util.Map</span>
<a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a>
<a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a><span class="kn">import</span><span class="w"> </span><span class="nn">org.apache.iceberg.hive.HiveCatalog</span><span class="p">;</span>
<a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a>
<a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="n">HiveCatalog</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">HiveCatalog</span><span class="p">();</span>
<a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a><span class="n">catalog</span><span class="p">.</span><span class="na">setConf</span><span class="p">(</span><span class="n">spark</span><span class="p">.</span><span class="na">sparkContext</span><span class="p">().</span><span class="na">hadoopConfiguration</span><span class="p">());</span><span class="w"> </span><span class="c1">// Optionally use Spark&#39;s Hadoop configuration</span>
<a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a>
<a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a><span class="n">Map</span><span class="w"> </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="k">new</span><span class="w"> </span><span class="n">HashMap</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="p">();</span>
<a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a><span class="n">properties</span><span class="p">.</span><span class="na">put</span><span class="p">(</span><span class="s">&quot;warehouse&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;...&quot;</span><span class="p">);</span>
<a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a><span class="n">properties</span><span class="p">.</span><span class="na">put</span><span class="p">(</span><span class="s">&quot;uri&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;...&quot;</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="n">catalog</span><span class="p">.</span><span class="na">initialize</span><span class="p">(</span><span class="s">&quot;hive&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">properties</span><span class="p">);</span>
</code></pre></div>
<p><code>HiveCatalog</code> implements the <code>Catalog</code> interface, which defines methods for working with tables, like <code>createTable</code>, <code>loadTable</code>, <code>renameTable</code>, and <code>dropTable</code>.
To create a table, pass an <code>Identifier</code> and a <code>Schema</code> along with other initial metadata:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="kn">import</span><span class="w"> </span><span class="nn">org.apache.iceberg.Table</span><span class="p">;</span>
<a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a><span class="kn">import</span><span class="w"> </span><span class="nn">org.apache.iceberg.catalog.TableIdentifier</span><span class="p">;</span>
<a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a>
<a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a><span class="n">TableIdentifier</span><span class="w"> </span><span class="n">name</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">of</span><span class="p">(</span><span class="s">&quot;logging&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;logs&quot;</span><span class="p">);</span>
<a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a><span class="n">Table</span><span class="w"> </span><span class="n">table</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">catalog</span><span class="p">.</span><span class="na">createTable</span><span class="p">(</span><span class="n">name</span><span class="p">,</span><span class="w"> </span><span class="n">schema</span><span class="p">,</span><span class="w"> </span><span class="n">spec</span><span class="p">);</span>
<a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a>
<a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a><span class="c1">// or to load an existing table, use the following line</span>
<a id="__codelineno-1-8" name="__codelineno-1-8" href="#__codelineno-1-8"></a><span class="n">Table</span><span class="w"> </span><span class="n">table</span><span class="w"> </span><span class="o">=</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">name</span><span class="p">);</span>
</code></pre></div>
<p>The table's <a href="#create-a-schema">schema</a> and <a href="#create-a-partition-spec">partition spec</a> are created below.</p>
<h3 id="using-a-hadoop-catalog">Using a Hadoop catalog<a class="headerlink" href="#using-a-hadoop-catalog" title="Permanent link">🔗</a></h3>
<p>A Hadoop catalog doesn't need to connect to a Hive MetaStore, but can only be used with HDFS or similar file systems that support atomic rename. Concurrent writes with a Hadoop catalog are not safe with a local FS or S3. To create a Hadoop catalog:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="kn">import</span><span class="w"> </span><span class="nn">org.apache.hadoop.conf.Configuration</span><span class="p">;</span>
<a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a><span class="kn">import</span><span class="w"> </span><span class="nn">org.apache.iceberg.hadoop.HadoopCatalog</span><span class="p">;</span>
<a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a>
<a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a><span class="n">Configuration</span><span class="w"> </span><span class="n">conf</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">Configuration</span><span class="p">();</span>
<a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a><span class="n">String</span><span class="w"> </span><span class="n">warehousePath</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">&quot;hdfs://host:8020/warehouse_path&quot;</span><span class="p">;</span>
<a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a><span class="n">HadoopCatalog</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">HadoopCatalog</span><span class="p">(</span><span class="n">conf</span><span class="p">,</span><span class="w"> </span><span class="n">warehousePath</span><span class="p">);</span>
</code></pre></div>
<p>Like the Hive catalog, <code>HadoopCatalog</code> implements <code>Catalog</code>, so it also has methods for working with tables, like <code>createTable</code>, <code>loadTable</code>, and <code>dropTable</code>.</p>
<p>This example creates a table with Hadoop catalog:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a><span class="kn">import</span><span class="w"> </span><span class="nn">org.apache.iceberg.Table</span><span class="p">;</span>
<a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a><span class="kn">import</span><span class="w"> </span><span class="nn">org.apache.iceberg.catalog.TableIdentifier</span><span class="p">;</span>
<a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a>
<a id="__codelineno-3-4" name="__codelineno-3-4" href="#__codelineno-3-4"></a><span class="n">TableIdentifier</span><span class="w"> </span><span class="n">name</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">of</span><span class="p">(</span><span class="s">&quot;logging&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;logs&quot;</span><span class="p">);</span>
<a id="__codelineno-3-5" name="__codelineno-3-5" href="#__codelineno-3-5"></a><span class="n">Table</span><span class="w"> </span><span class="n">table</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">catalog</span><span class="p">.</span><span class="na">createTable</span><span class="p">(</span><span class="n">name</span><span class="p">,</span><span class="w"> </span><span class="n">schema</span><span class="p">,</span><span class="w"> </span><span class="n">spec</span><span class="p">);</span>
<a id="__codelineno-3-6" name="__codelineno-3-6" href="#__codelineno-3-6"></a>
<a id="__codelineno-3-7" name="__codelineno-3-7" href="#__codelineno-3-7"></a><span class="c1">// or to load an existing table, use the following line</span>
<a id="__codelineno-3-8" name="__codelineno-3-8" href="#__codelineno-3-8"></a><span class="n">Table</span><span class="w"> </span><span class="n">table</span><span class="w"> </span><span class="o">=</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">name</span><span class="p">);</span>
</code></pre></div>
<p>The table's <a href="#create-a-schema">schema</a> and <a href="#create-a-partition-spec">partition spec</a> are created below.</p>
<h3 id="tables-in-spark">Tables in Spark<a class="headerlink" href="#tables-in-spark" title="Permanent link">🔗</a></h3>
<p>Spark can work with table by name using <code>HiveCatalog</code>.</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a><span class="c1">// spark.sql.catalog.hive_prod = org.apache.iceberg.spark.SparkCatalog</span>
<a id="__codelineno-4-2" name="__codelineno-4-2" href="#__codelineno-4-2"></a><span class="c1">// spark.sql.catalog.hive_prod.type = hive</span>
<a id="__codelineno-4-3" name="__codelineno-4-3" href="#__codelineno-4-3"></a><span class="n">spark</span><span class="p">.</span><span class="na">table</span><span class="p">(</span><span class="s">&quot;logging.logs&quot;</span><span class="p">);</span>
</code></pre></div>
<p>Spark can also load table created by <code>HadoopCatalog</code> by path.
<div class="highlight"><pre><span></span><code><a id="__codelineno-5-1" name="__codelineno-5-1" href="#__codelineno-5-1"></a><span class="n">spark</span><span class="p">.</span><span class="na">read</span><span class="p">.</span><span class="na">format</span><span class="p">(</span><span class="s">&quot;iceberg&quot;</span><span class="p">).</span><span class="na">load</span><span class="p">(</span><span class="s">&quot;hdfs://host:8020/warehouse_path/logging/logs&quot;</span><span class="p">);</span>
</code></pre></div></p>
<h2 id="schemas">Schemas<a class="headerlink" href="#schemas" title="Permanent link">🔗</a></h2>
<h3 id="create-a-schema">Create a schema<a class="headerlink" href="#create-a-schema" title="Permanent link">🔗</a></h3>
<p>This example creates a schema for a <code>logs</code> table:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-6-1" name="__codelineno-6-1" href="#__codelineno-6-1"></a><span class="kn">import</span><span class="w"> </span><span class="nn">org.apache.iceberg.Schema</span><span class="p">;</span>
<a id="__codelineno-6-2" name="__codelineno-6-2" href="#__codelineno-6-2"></a><span class="kn">import</span><span class="w"> </span><span class="nn">org.apache.iceberg.types.Types</span><span class="p">;</span>
<a id="__codelineno-6-3" name="__codelineno-6-3" href="#__codelineno-6-3"></a>
<a id="__codelineno-6-4" name="__codelineno-6-4" href="#__codelineno-6-4"></a><span class="n">Schema</span><span class="w"> </span><span class="n">schema</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">Schema</span><span class="p">(</span>
<a id="__codelineno-6-5" name="__codelineno-6-5" href="#__codelineno-6-5"></a><span class="w"> </span><span class="n">Types</span><span class="p">.</span><span class="na">NestedField</span><span class="p">.</span><span class="na">required</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;level&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">Types</span><span class="p">.</span><span class="na">StringType</span><span class="p">.</span><span class="na">get</span><span class="p">()),</span>
<a id="__codelineno-6-6" name="__codelineno-6-6" href="#__codelineno-6-6"></a><span class="w"> </span><span class="n">Types</span><span class="p">.</span><span class="na">NestedField</span><span class="p">.</span><span class="na">required</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;event_time&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">Types</span><span class="p">.</span><span class="na">TimestampType</span><span class="p">.</span><span class="na">withZone</span><span class="p">()),</span>
<a id="__codelineno-6-7" name="__codelineno-6-7" href="#__codelineno-6-7"></a><span class="w"> </span><span class="n">Types</span><span class="p">.</span><span class="na">NestedField</span><span class="p">.</span><span class="na">required</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;message&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">Types</span><span class="p">.</span><span class="na">StringType</span><span class="p">.</span><span class="na">get</span><span class="p">()),</span>
<a id="__codelineno-6-8" name="__codelineno-6-8" href="#__codelineno-6-8"></a><span class="w"> </span><span class="n">Types</span><span class="p">.</span><span class="na">NestedField</span><span class="p">.</span><span class="na">optional</span><span class="p">(</span><span class="mi">4</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;call_stack&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">Types</span><span class="p">.</span><span class="na">ListType</span><span class="p">.</span><span class="na">ofRequired</span><span class="p">(</span><span class="mi">5</span><span class="p">,</span><span class="w"> </span><span class="n">Types</span><span class="p">.</span><span class="na">StringType</span><span class="p">.</span><span class="na">get</span><span class="p">()))</span>
<a id="__codelineno-6-9" name="__codelineno-6-9" href="#__codelineno-6-9"></a><span class="w"> </span><span class="p">);</span>
</code></pre></div>
<p>When using the Iceberg API directly, type IDs are required. Conversions from other schema formats, like Spark, Avro, and Parquet will automatically assign new IDs.</p>
<p>When a table is created, all IDs in the schema are re-assigned to ensure uniqueness.</p>
<h3 id="convert-a-schema-from-avro">Convert a schema from Avro<a class="headerlink" href="#convert-a-schema-from-avro" title="Permanent link">🔗</a></h3>
<p>To create an Iceberg schema from an existing Avro schema, use converters in <code>AvroSchemaUtil</code>:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-7-1" name="__codelineno-7-1" href="#__codelineno-7-1"></a><span class="kn">import</span><span class="w"> </span><span class="nn">org.apache.avro.Schema</span><span class="p">;</span>
<a id="__codelineno-7-2" name="__codelineno-7-2" href="#__codelineno-7-2"></a><span class="kn">import</span><span class="w"> </span><span class="nn">org.apache.avro.Schema.Parser</span><span class="p">;</span>
<a id="__codelineno-7-3" name="__codelineno-7-3" href="#__codelineno-7-3"></a><span class="kn">import</span><span class="w"> </span><span class="nn">org.apache.iceberg.avro.AvroSchemaUtil</span><span class="p">;</span>
<a id="__codelineno-7-4" name="__codelineno-7-4" href="#__codelineno-7-4"></a>
<a id="__codelineno-7-5" name="__codelineno-7-5" href="#__codelineno-7-5"></a><span class="n">Schema</span><span class="w"> </span><span class="n">avroSchema</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">Parser</span><span class="p">().</span><span class="na">parse</span><span class="p">(</span><span class="s">&quot;{\&quot;type\&quot;: \&quot;record\&quot; , ... }&quot;</span><span class="p">);</span>
<a id="__codelineno-7-6" name="__codelineno-7-6" href="#__codelineno-7-6"></a><span class="n">Schema</span><span class="w"> </span><span class="n">icebergSchema</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">AvroSchemaUtil</span><span class="p">.</span><span class="na">toIceberg</span><span class="p">(</span><span class="n">avroSchema</span><span class="p">);</span>
</code></pre></div>
<h3 id="convert-a-schema-from-spark">Convert a schema from Spark<a class="headerlink" href="#convert-a-schema-from-spark" title="Permanent link">🔗</a></h3>
<p>To create an Iceberg schema from an existing table, use converters in <code>SparkSchemaUtil</code>:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-8-1" name="__codelineno-8-1" href="#__codelineno-8-1"></a><span class="kn">import</span><span class="w"> </span><span class="nn">org.apache.iceberg.spark.SparkSchemaUtil</span><span class="p">;</span>
<a id="__codelineno-8-2" name="__codelineno-8-2" href="#__codelineno-8-2"></a>
<a id="__codelineno-8-3" name="__codelineno-8-3" href="#__codelineno-8-3"></a><span class="n">Schema</span><span class="w"> </span><span class="n">schema</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">SparkSchemaUtil</span><span class="p">.</span><span class="na">schemaForTable</span><span class="p">(</span><span class="n">sparkSession</span><span class="p">,</span><span class="w"> </span><span class="n">tableName</span><span class="p">);</span>
</code></pre></div>
<h2 id="partitioning">Partitioning<a class="headerlink" href="#partitioning" title="Permanent link">🔗</a></h2>
<h3 id="create-a-partition-spec">Create a partition spec<a class="headerlink" href="#create-a-partition-spec" title="Permanent link">🔗</a></h3>
<p>Partition specs describe how Iceberg should group records into data files. Partition specs are created for a table's schema using a builder.</p>
<p>This example creates a partition spec for the <code>logs</code> table that partitions records by the hour of the log event's timestamp and by log level:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-9-1" name="__codelineno-9-1" href="#__codelineno-9-1"></a><span class="kn">import</span><span class="w"> </span><span class="nn">org.apache.iceberg.PartitionSpec</span><span class="p">;</span>
<a id="__codelineno-9-2" name="__codelineno-9-2" href="#__codelineno-9-2"></a>
<a id="__codelineno-9-3" name="__codelineno-9-3" href="#__codelineno-9-3"></a><span class="n">PartitionSpec</span><span class="w"> </span><span class="n">spec</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">PartitionSpec</span><span class="p">.</span><span class="na">builderFor</span><span class="p">(</span><span class="n">schema</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="na">hour</span><span class="p">(</span><span class="s">&quot;event_time&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="na">identity</span><span class="p">(</span><span class="s">&quot;level&quot;</span><span class="p">)</span>
<a id="__codelineno-9-6" name="__codelineno-9-6" href="#__codelineno-9-6"></a><span class="w"> </span><span class="p">.</span><span class="na">build</span><span class="p">();</span>
</code></pre></div>
<p>For more information on the different partition transforms that Iceberg offers, visit <a href="../../../spec/#partitioning">this page</a>.</p>
<h2 id="branching-and-tagging">Branching and Tagging<a class="headerlink" href="#branching-and-tagging" title="Permanent link">🔗</a></h2>
<h3 id="creating-branches-and-tags">Creating branches and tags<a class="headerlink" href="#creating-branches-and-tags" title="Permanent link">🔗</a></h3>
<p>New branches and tags can be created via the Java library's ManageSnapshots API. </p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-10-1" name="__codelineno-10-1" href="#__codelineno-10-1"></a><span class="cm">/* Create a branch test-branch which is retained for 1 week, and the latest 2 snapshots on test-branch will always be retained. </span>
<a id="__codelineno-10-2" name="__codelineno-10-2" href="#__codelineno-10-2"></a><span class="cm">Snapshots on test-branch which are created within the last hour will also be retained. */</span>
<a id="__codelineno-10-3" name="__codelineno-10-3" href="#__codelineno-10-3"></a>
<a id="__codelineno-10-4" name="__codelineno-10-4" href="#__codelineno-10-4"></a><span class="n">String</span><span class="w"> </span><span class="n">branch</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">&quot;test-branch&quot;</span><span class="p">;</span>
<a id="__codelineno-10-5" name="__codelineno-10-5" href="#__codelineno-10-5"></a><span class="n">table</span><span class="p">.</span><span class="na">manageSnapshots</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="na">createBranch</span><span class="p">(</span><span class="n">branch</span><span class="p">,</span><span class="w"> </span><span class="mi">3</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="p">.</span><span class="na">setMinSnapshotsToKeep</span><span class="p">(</span><span class="n">branch</span><span class="p">,</span><span class="w"> </span><span class="mi">2</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="p">.</span><span class="na">setMaxSnapshotAgeMs</span><span class="p">(</span><span class="n">branch</span><span class="p">,</span><span class="w"> </span><span class="mi">3600000</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><span class="na">setMaxRefAgeMs</span><span class="p">(</span><span class="n">branch</span><span class="p">,</span><span class="w"> </span><span class="mi">604800000</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="p">.</span><span class="na">commit</span><span class="p">();</span>
<a id="__codelineno-10-11" name="__codelineno-10-11" href="#__codelineno-10-11"></a>
<a id="__codelineno-10-12" name="__codelineno-10-12" href="#__codelineno-10-12"></a><span class="c1">// Create a tag historical-tag at snapshot 10 which is retained for a day</span>
<a id="__codelineno-10-13" name="__codelineno-10-13" href="#__codelineno-10-13"></a><span class="n">String</span><span class="w"> </span><span class="n">tag</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">&quot;historical-tag&quot;</span>
<a id="__codelineno-10-14" name="__codelineno-10-14" href="#__codelineno-10-14"></a><span class="n">table</span><span class="p">.</span><span class="na">manageSnapshots</span><span class="p">()</span>
<a id="__codelineno-10-15" name="__codelineno-10-15" href="#__codelineno-10-15"></a><span class="w"> </span><span class="p">.</span><span class="na">createTag</span><span class="p">(</span><span class="n">tag</span><span class="p">,</span><span class="w"> </span><span class="mi">10</span><span class="p">)</span>
<a id="__codelineno-10-16" name="__codelineno-10-16" href="#__codelineno-10-16"></a><span class="w"> </span><span class="p">.</span><span class="na">setMaxRefAgeMs</span><span class="p">(</span><span class="n">tag</span><span class="p">,</span><span class="w"> </span><span class="mi">86400000</span><span class="p">)</span>
<a id="__codelineno-10-17" name="__codelineno-10-17" href="#__codelineno-10-17"></a><span class="w"> </span><span class="p">.</span><span class="na">commit</span><span class="p">();</span>
</code></pre></div>
<h3 id="committing-to-branches">Committing to branches<a class="headerlink" href="#committing-to-branches" title="Permanent link">🔗</a></h3>
<p>Writing to a branch can be performed by specifying <code>toBranch</code> in the operation. For the full list refer to <a href="../api/#update-operations">UpdateOperations</a>.
<div class="highlight"><pre><span></span><code><a id="__codelineno-11-1" name="__codelineno-11-1" href="#__codelineno-11-1"></a><span class="c1">// Append FILE_A to branch test-branch </span>
<a id="__codelineno-11-2" name="__codelineno-11-2" href="#__codelineno-11-2"></a><span class="n">String</span><span class="w"> </span><span class="n">branch</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">&quot;test-branch&quot;</span><span class="p">;</span>
<a id="__codelineno-11-3" name="__codelineno-11-3" href="#__codelineno-11-3"></a>
<a id="__codelineno-11-4" name="__codelineno-11-4" href="#__codelineno-11-4"></a><span class="n">table</span><span class="p">.</span><span class="na">newAppend</span><span class="p">()</span>
<a id="__codelineno-11-5" name="__codelineno-11-5" href="#__codelineno-11-5"></a><span class="w"> </span><span class="p">.</span><span class="na">appendFile</span><span class="p">(</span><span class="n">FILE_A</span><span class="p">)</span>
<a id="__codelineno-11-6" name="__codelineno-11-6" href="#__codelineno-11-6"></a><span class="w"> </span><span class="p">.</span><span class="na">toBranch</span><span class="p">(</span><span class="n">branch</span><span class="p">)</span>
<a id="__codelineno-11-7" name="__codelineno-11-7" href="#__codelineno-11-7"></a><span class="w"> </span><span class="p">.</span><span class="na">commit</span><span class="p">();</span>
<a id="__codelineno-11-8" name="__codelineno-11-8" href="#__codelineno-11-8"></a>
<a id="__codelineno-11-9" name="__codelineno-11-9" href="#__codelineno-11-9"></a>
<a id="__codelineno-11-10" name="__codelineno-11-10" href="#__codelineno-11-10"></a><span class="c1">// Perform row level updates on &quot;test-branch&quot;</span>
<a id="__codelineno-11-11" name="__codelineno-11-11" href="#__codelineno-11-11"></a><span class="n">table</span><span class="p">.</span><span class="na">newRowDelta</span><span class="p">()</span>
<a id="__codelineno-11-12" name="__codelineno-11-12" href="#__codelineno-11-12"></a><span class="w"> </span><span class="p">.</span><span class="na">addRows</span><span class="p">(</span><span class="n">DATA_FILE</span><span class="p">)</span>
<a id="__codelineno-11-13" name="__codelineno-11-13" href="#__codelineno-11-13"></a><span class="w"> </span><span class="p">.</span><span class="na">addDeletes</span><span class="p">(</span><span class="n">DELETES</span><span class="p">)</span>
<a id="__codelineno-11-14" name="__codelineno-11-14" href="#__codelineno-11-14"></a><span class="w"> </span><span class="p">.</span><span class="na">toBranch</span><span class="p">(</span><span class="n">branch</span><span class="p">)</span>
<a id="__codelineno-11-15" name="__codelineno-11-15" href="#__codelineno-11-15"></a><span class="w"> </span><span class="p">.</span><span class="na">commit</span><span class="p">();</span>
<a id="__codelineno-11-16" name="__codelineno-11-16" href="#__codelineno-11-16"></a>
<a id="__codelineno-11-17" name="__codelineno-11-17" href="#__codelineno-11-17"></a>
<a id="__codelineno-11-18" name="__codelineno-11-18" href="#__codelineno-11-18"></a><span class="c1">// Perform a rewrite operation replacing SMALL_FILE_1 and SMALL_FILE_2 on &quot;test-branch&quot; with compactedFile.</span>
<a id="__codelineno-11-19" name="__codelineno-11-19" href="#__codelineno-11-19"></a><span class="n">table</span><span class="p">.</span><span class="na">newRewrite</span><span class="p">()</span>
<a id="__codelineno-11-20" name="__codelineno-11-20" href="#__codelineno-11-20"></a><span class="w"> </span><span class="p">.</span><span class="na">rewriteFiles</span><span class="p">(</span><span class="n">ImmutableSet</span><span class="p">.</span><span class="na">of</span><span class="p">(</span><span class="n">SMALL_FILE_1</span><span class="p">,</span><span class="w"> </span><span class="n">SMALL_FILE_2</span><span class="p">),</span><span class="w"> </span><span class="n">ImmutableSet</span><span class="p">.</span><span class="na">of</span><span class="p">(</span><span class="n">compactedFile</span><span class="p">))</span>
<a id="__codelineno-11-21" name="__codelineno-11-21" href="#__codelineno-11-21"></a><span class="w"> </span><span class="p">.</span><span class="na">toBranch</span><span class="p">(</span><span class="n">branch</span><span class="p">)</span>
<a id="__codelineno-11-22" name="__codelineno-11-22" href="#__codelineno-11-22"></a><span class="w"> </span><span class="p">.</span><span class="na">commit</span><span class="p">();</span>
</code></pre></div></p>
<h3 id="reading-from-branches-and-tags">Reading from branches and tags<a class="headerlink" href="#reading-from-branches-and-tags" title="Permanent link">🔗</a></h3>
<p>Reading from a branch or tag can be done as usual via the Table Scan API, by passing in a branch or tag in the <code>useRef</code> API. When a branch is passed in, the snapshot that's used is the head of the branch. Note that currently reading from a branch and specifying an <code>asOfSnapshotId</code> in the scan is not supported. </p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-12-1" name="__codelineno-12-1" href="#__codelineno-12-1"></a><span class="c1">// Read from the head snapshot of test-branch</span>
<a id="__codelineno-12-2" name="__codelineno-12-2" href="#__codelineno-12-2"></a><span class="n">TableScan</span><span class="w"> </span><span class="n">branchRead</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">table</span><span class="p">.</span><span class="na">newScan</span><span class="p">().</span><span class="na">useRef</span><span class="p">(</span><span class="s">&quot;test-branch&quot;</span><span class="p">);</span>
<a id="__codelineno-12-3" name="__codelineno-12-3" href="#__codelineno-12-3"></a>
<a id="__codelineno-12-4" name="__codelineno-12-4" href="#__codelineno-12-4"></a><span class="c1">// Read from the snapshot referenced by audit-tag</span>
<a id="__codelineno-12-5" name="__codelineno-12-5" href="#__codelineno-12-5"></a><span class="n">TableScan</span><span class="w"> </span><span class="n">tagRead</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">table</span><span class="p">.</span><span class="na">newScan</span><span class="p">().</span><span class="na">useRef</span><span class="p">(</span><span class="s">&quot;audit-tag&quot;</span><span class="p">);</span>
</code></pre></div>
<h3 id="replacing-and-fast-forwarding-branches-and-tags">Replacing and fast forwarding branches and tags<a class="headerlink" href="#replacing-and-fast-forwarding-branches-and-tags" title="Permanent link">🔗</a></h3>
<p>The snapshots which existing branches and tags point to can be updated via the <code>replace</code> APIs. The fast forward operation is similar to git fast-forwarding. Fast forward can be used to advance a target branch to the head of a source branch or a tag when the target branch is an ancestor of the source. For both fast forward and replace, retention properties of the target branch are maintained by default.</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-13-1" name="__codelineno-13-1" href="#__codelineno-13-1"></a><span class="c1">// Update &quot;test-branch&quot; to point to snapshot 4</span>
<a id="__codelineno-13-2" name="__codelineno-13-2" href="#__codelineno-13-2"></a><span class="n">table</span><span class="p">.</span><span class="na">manageSnapshots</span><span class="p">()</span>
<a id="__codelineno-13-3" name="__codelineno-13-3" href="#__codelineno-13-3"></a><span class="w"> </span><span class="p">.</span><span class="na">replaceBranch</span><span class="p">(</span><span class="n">branch</span><span class="p">,</span><span class="w"> </span><span class="mi">4</span><span class="p">)</span>
<a id="__codelineno-13-4" name="__codelineno-13-4" href="#__codelineno-13-4"></a><span class="w"> </span><span class="p">.</span><span class="na">commit</span><span class="p">()</span>
<a id="__codelineno-13-5" name="__codelineno-13-5" href="#__codelineno-13-5"></a>
<a id="__codelineno-13-6" name="__codelineno-13-6" href="#__codelineno-13-6"></a><span class="n">String</span><span class="w"> </span><span class="n">tag</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">&quot;audit-tag&quot;</span><span class="p">;</span>
<a id="__codelineno-13-7" name="__codelineno-13-7" href="#__codelineno-13-7"></a><span class="c1">// Replace &quot;audit-tag&quot; to point to snapshot 3 and update its retention</span>
<a id="__codelineno-13-8" name="__codelineno-13-8" href="#__codelineno-13-8"></a><span class="n">table</span><span class="p">.</span><span class="na">manageSnapshots</span><span class="p">()</span>
<a id="__codelineno-13-9" name="__codelineno-13-9" href="#__codelineno-13-9"></a><span class="w"> </span><span class="p">.</span><span class="na">replaceBranch</span><span class="p">(</span><span class="n">tag</span><span class="p">,</span><span class="w"> </span><span class="mi">4</span><span class="p">)</span>
<a id="__codelineno-13-10" name="__codelineno-13-10" href="#__codelineno-13-10"></a><span class="w"> </span><span class="p">.</span><span class="na">setMaxRefAgeMs</span><span class="p">(</span><span class="mi">1000</span><span class="p">)</span>
<a id="__codelineno-13-11" name="__codelineno-13-11" href="#__codelineno-13-11"></a><span class="w"> </span><span class="p">.</span><span class="na">commit</span><span class="p">()</span>
</code></pre></div>
<h3 id="updating-retention-properties">Updating retention properties<a class="headerlink" href="#updating-retention-properties" title="Permanent link">🔗</a></h3>
<p>Retention properties for branches and tags can be updated as well.
Use the setMaxRefAgeMs for updating the retention property of the branch or tag itself. Branch snapshot retention properties can be updated via the <code>setMinSnapshotsToKeep</code> and <code>setMaxSnapshotAgeMs</code> APIs. </p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-14-1" name="__codelineno-14-1" href="#__codelineno-14-1"></a><span class="n">String</span><span class="w"> </span><span class="n">branch</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">&quot;test-branch&quot;</span><span class="p">;</span>
<a id="__codelineno-14-2" name="__codelineno-14-2" href="#__codelineno-14-2"></a><span class="c1">// Update retention properties for test-branch</span>
<a id="__codelineno-14-3" name="__codelineno-14-3" href="#__codelineno-14-3"></a><span class="n">table</span><span class="p">.</span><span class="na">manageSnapshots</span><span class="p">()</span>
<a id="__codelineno-14-4" name="__codelineno-14-4" href="#__codelineno-14-4"></a><span class="w"> </span><span class="p">.</span><span class="na">setMinSnapshotsToKeep</span><span class="p">(</span><span class="n">branch</span><span class="p">,</span><span class="w"> </span><span class="mi">10</span><span class="p">)</span>
<a id="__codelineno-14-5" name="__codelineno-14-5" href="#__codelineno-14-5"></a><span class="w"> </span><span class="p">.</span><span class="na">setMaxSnapshotAgeMs</span><span class="p">(</span><span class="n">branch</span><span class="p">,</span><span class="w"> </span><span class="mi">7200000</span><span class="p">)</span>
<a id="__codelineno-14-6" name="__codelineno-14-6" href="#__codelineno-14-6"></a><span class="w"> </span><span class="p">.</span><span class="na">setMaxRefAgeMs</span><span class="p">(</span><span class="n">branch</span><span class="p">,</span><span class="w"> </span><span class="mi">604800000</span><span class="p">)</span>
<a id="__codelineno-14-7" name="__codelineno-14-7" href="#__codelineno-14-7"></a><span class="w"> </span><span class="p">.</span><span class="na">commit</span><span class="p">();</span>
<a id="__codelineno-14-8" name="__codelineno-14-8" href="#__codelineno-14-8"></a>
<a id="__codelineno-14-9" name="__codelineno-14-9" href="#__codelineno-14-9"></a><span class="c1">// Update retention properties for test-tag</span>
<a id="__codelineno-14-10" name="__codelineno-14-10" href="#__codelineno-14-10"></a><span class="n">table</span><span class="p">.</span><span class="na">manageSnapshots</span><span class="p">()</span>
<a id="__codelineno-14-11" name="__codelineno-14-11" href="#__codelineno-14-11"></a><span class="w"> </span><span class="p">.</span><span class="na">setMaxRefAgeMs</span><span class="p">(</span><span class="s">&quot;test-tag&quot;</span><span class="p">,</span><span class="w"> </span><span class="mi">604800000</span><span class="p">)</span>
<a id="__codelineno-14-12" name="__codelineno-14-12" href="#__codelineno-14-12"></a><span class="w"> </span><span class="p">.</span><span class="na">commit</span><span class="p">();</span>
</code></pre></div>
<h3 id="removing-branches-and-tags">Removing branches and tags<a class="headerlink" href="#removing-branches-and-tags" title="Permanent link">🔗</a></h3>
<p>Branches and tags can be removed via the <code>removeBranch</code> and <code>removeTag</code> APIs respectively</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-15-1" name="__codelineno-15-1" href="#__codelineno-15-1"></a><span class="c1">// Remove test-branch</span>
<a id="__codelineno-15-2" name="__codelineno-15-2" href="#__codelineno-15-2"></a><span class="n">table</span><span class="p">.</span><span class="na">manageSnapshots</span><span class="p">()</span>
<a id="__codelineno-15-3" name="__codelineno-15-3" href="#__codelineno-15-3"></a><span class="w"> </span><span class="p">.</span><span class="na">removeBranch</span><span class="p">(</span><span class="s">&quot;test-branch&quot;</span><span class="p">)</span>
<a id="__codelineno-15-4" name="__codelineno-15-4" href="#__codelineno-15-4"></a><span class="w"> </span><span class="p">.</span><span class="na">commit</span><span class="p">()</span>
<a id="__codelineno-15-5" name="__codelineno-15-5" href="#__codelineno-15-5"></a>
<a id="__codelineno-15-6" name="__codelineno-15-6" href="#__codelineno-15-6"></a><span class="c1">// Remove test-tag</span>
<a id="__codelineno-15-7" name="__codelineno-15-7" href="#__codelineno-15-7"></a><span class="n">table</span><span class="p">.</span><span class="na">manageSnapshots</span><span class="p">()</span>
<a id="__codelineno-15-8" name="__codelineno-15-8" href="#__codelineno-15-8"></a><span class="w"> </span><span class="p">.</span><span class="na">removeTag</span><span class="p">(</span><span class="s">&quot;test-tag&quot;</span><span class="p">)</span>
<a id="__codelineno-15-9" name="__codelineno-15-9" href="#__codelineno-15-9"></a><span class="w"> </span><span class="p">.</span><span class="na">commit</span><span class="p">()</span>
</code></pre></div>
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