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<article data-swiftype-index='true'>
<a class='edit-link' href="https://github.com/apache/ignite/tree/IGNITE-7595/docs/_docs/extensions-and-integrations/cassandra/usage-examples.adoc" target="_blank">Edit</a>
<h1>Ignite Cassandra Integration Usage Examples</h1>
<div class="sect1">
<h2 id="overview">Overview</h2>
<div class="sectionbody">
<div class="paragraph">
<p>As described in <a href="/docs/latest/extensions-and-integrations/cassandra/configuration">configuration section</a>, to configure Cassandra
as a cache store you need to set <code>CacheStoreFactory</code> for your Ignite caches to <code>org.apache.ignite.cache.store.cassandra.CassandraCacheStoreFactory</code>.</p>
</div>
<div class="paragraph">
<p>Below is an example of a typical configuration for Ignite cache to use Cassandra as a cache store. We will go step-by-step
through all the configuration items, further down. The example is taken from the unit tests resource file
<code>store/src/test/resources/org/apache/ignite/tests/persistence/blob/ignite-config.xml</code> of the Cassandra module source code.</p>
</div>
<code-tabs><code-tab data-tab='XML'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="xml"><span class="cp">&lt;?xml version="1.0" encoding="UTF-8"?&gt;</span>
<span class="nt">&lt;beans</span> <span class="na">xmlns=</span><span class="s">"http://www.springframework.org/schema/beans"</span>
<span class="na">xmlns:xsi=</span><span class="s">"http://www.w3.org/2001/XMLSchema-instance"</span>
<span class="na">xsi:schemaLocation=</span><span class="s">"
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd"</span><span class="nt">&gt;</span>
<span class="c">&lt;!-- Cassandra connection settings --&gt;</span>
<span class="nt">&lt;import</span> <span class="na">resource=</span><span class="s">"classpath:org/apache/ignite/tests/cassandra/connection-settings.xml"</span> <span class="nt">/&gt;</span>
<span class="c">&lt;!-- Persistence settings for 'cache1' --&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">id=</span><span class="s">"cache1_persistence_settings"</span> <span class="na">class=</span><span class="s">"org.apache.ignite.cache.store.cassandra.persistence.KeyValuePersistenceSettings"</span><span class="nt">&gt;</span>
<span class="nt">&lt;constructor-arg</span> <span class="na">type=</span><span class="s">"org.springframework.core.io.Resource"</span> <span class="na">value=</span><span class="s">"classpath:org/apache/ignite/tests/persistence/blob/persistence-settings-1.xml"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="c">&lt;!-- Persistence settings for 'cache2' --&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">id=</span><span class="s">"cache2_persistence_settings"</span> <span class="na">class=</span><span class="s">"org.apache.ignite.cache.store.cassandra.persistence.KeyValuePersistenceSettings"</span><span class="nt">&gt;</span>
<span class="nt">&lt;constructor-arg</span> <span class="na">type=</span><span class="s">"org.springframework.core.io.Resource"</span> <span class="na">value=</span><span class="s">"classpath:org/apache/ignite/tests/persistence/blob/persistence-settings-3.xml"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="c">&lt;!-- Ignite configuration --&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">id=</span><span class="s">"ignite.cfg"</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.IgniteConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"cacheConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;list&gt;</span>
<span class="c">&lt;!-- Configuring persistence for "cache1" cache --&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.CacheConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"name"</span> <span class="na">value=</span><span class="s">"cache1"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"readThrough"</span> <span class="na">value=</span><span class="s">"true"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"writeThrough"</span> <span class="na">value=</span><span class="s">"true"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"cacheStoreFactory"</span><span class="nt">&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.cache.store.cassandra.CassandraCacheStoreFactory"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"dataSourceBean"</span> <span class="na">value=</span><span class="s">"cassandraAdminDataSource"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"persistenceSettingsBean"</span> <span class="na">value=</span><span class="s">"cache1_persistence_settings"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;/property&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="c">&lt;!-- Configuring persistence for "cache2" cache --&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.CacheConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"name"</span> <span class="na">value=</span><span class="s">"cache2"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"readThrough"</span> <span class="na">value=</span><span class="s">"true"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"writeThrough"</span> <span class="na">value=</span><span class="s">"true"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"cacheStoreFactory"</span><span class="nt">&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.cache.store.cassandra.CassandraCacheStoreFactory"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"dataSourceBean"</span> <span class="na">value=</span><span class="s">"cassandraAdminDataSource"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"persistenceSettingsBean"</span> <span class="na">value=</span><span class="s">"cache2_persistence_settings"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;/property&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;/list&gt;</span>
<span class="nt">&lt;/property&gt;</span>
<span class="c">&lt;!-- Explicitly configure TCP discovery SPI to provide list of initial nodes. --&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"discoverySpi"</span><span class="nt">&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.spi.discovery.tcp.TcpDiscoverySpi"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"ipFinder"</span><span class="nt">&gt;</span>
<span class="c">&lt;!--
Ignite provides several options for automatic discovery that can be used
instead os static IP based discovery. For information on all options refer
to our documentation: https://ignite.apache.org/docs/latest/clustering/clustering
--&gt;</span>
<span class="c">&lt;!-- Uncomment static IP finder to enable static-based discovery of initial nodes. --&gt;</span>
<span class="c">&lt;!--&lt;bean class="org.apache.ignite.spi.discovery.tcp.ipfinder.vm.TcpDiscoveryVmIpFinder"&gt;--&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.spi.discovery.tcp.ipfinder.multicast.TcpDiscoveryMulticastIpFinder"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"addresses"</span><span class="nt">&gt;</span>
<span class="nt">&lt;list&gt;</span>
<span class="c">&lt;!-- In distributed environment, replace with actual host IP address. --&gt;</span>
<span class="nt">&lt;value&gt;</span>127.0.0.1:47500..47509<span class="nt">&lt;/value&gt;</span>
<span class="nt">&lt;/list&gt;</span>
<span class="nt">&lt;/property&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;/property&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;/property&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;/beans&gt;</span></code></pre>
</div>
</div></code-tab></code-tabs>
<div class="paragraph">
<p>In the specified example we have two Ignite caches configured: <code>cache1</code> and <code>cache2</code>. So lets look at the configuration details.</p>
</div>
<div class="paragraph">
<p>Lets start from the cache configuration details. They are pretty similar for both caches (<code>cache1</code> and <code>cache2</code>) and looks like that:</p>
</div>
<code-tabs><code-tab data-tab='XML'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="xml"><span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.CacheConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"name"</span> <span class="na">value=</span><span class="s">"cache1"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"readThrough"</span> <span class="na">value=</span><span class="s">"true"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"writeThrough"</span> <span class="na">value=</span><span class="s">"true"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"cacheStoreFactory"</span><span class="nt">&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.cache.store.cassandra.CassandraCacheStoreFactory"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"dataSourceBean"</span> <span class="na">value=</span><span class="s">"cassandraAdminDataSource"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"persistenceSettingsBean"</span> <span class="na">value=</span><span class="s">"cache1_persistence_settings"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;/property&gt;</span>
<span class="nt">&lt;/bean&gt;</span></code></pre>
</div>
</div></code-tab></code-tabs>
<div class="paragraph">
<p>First of all we can see that <code>read-through</code> and <code>write-through</code> options are enabled:</p>
</div>
<code-tabs><code-tab data-tab='XML'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="xml"><span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"readThrough"</span> <span class="na">value=</span><span class="s">"true"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"writeThrough"</span> <span class="na">value=</span><span class="s">"true"</span><span class="nt">/&gt;</span></code></pre>
</div>
</div></code-tab></code-tabs>
<div class="paragraph">
<p>which is required for Ignite cache, if you plan to use a persistent store for cache entries which expired.</p>
</div>
<div class="paragraph">
<p>You can optionally specify the <code>write-behind</code> setting if you prefer persistent store to be updated asynchronously:</p>
</div>
<code-tabs><code-tab data-tab='XML'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="xml"><span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"readThrough"</span> <span class="na">value=</span><span class="s">"true"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"writeThrough"</span> <span class="na">value=</span><span class="s">"true"</span><span class="nt">/&gt;</span></code></pre>
</div>
</div></code-tab></code-tabs>
<div class="paragraph">
<p>The next important thing is <code>CacheStoreFactory</code> configuration:</p>
</div>
<code-tabs><code-tab data-tab='XML'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="xml"><span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"cacheStoreFactory"</span><span class="nt">&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.cache.store.cassandra.CassandraCacheStoreFactory"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"dataSourceBean"</span> <span class="na">value=</span><span class="s">"cassandraAdminDataSource"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"persistenceSettingsBean"</span> <span class="na">value=</span><span class="s">"cache1_persistence_settings"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;/property&gt;</span></code></pre>
</div>
</div></code-tab></code-tabs>
<div class="paragraph">
<p>You should use <code>org.apache.ignite.cache.store.cassandra.CassandraCacheStoreFactory</code> as a <code>CacheStoreFactory</code> for your
Ignite caches to utilize Cassandra as a persistent store. For <code>CassandraCacheStoreFactory</code> you should specify two required properties:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>dataSourceBean</code> - name of the Spring bean, which specifies all the details about Cassandra database connection.</p>
</li>
<li>
<p><code>persistenceSettingsBean</code> - name of the Spring bean, which specifies all the details about how objects should be persisted into Cassandra database.</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>In the specified example <code>cassandraAdminDataSource</code> is a data source bean, which is imported into Ignite cache config file using this directive:</p>
</div>
<code-tabs><code-tab data-tab='XML'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="xml"><span class="nt">&lt;import</span> <span class="na">resource=</span><span class="s">"classpath:org/apache/ignite/tests/cassandra/connection-settings.xml"</span> <span class="nt">/&gt;</span></code></pre>
</div>
</div></code-tab></code-tabs>
<div class="paragraph">
<p>and <code>cache1_persistence_settings</code> is a persistence settings bean, which is defined in Ignite cache config file using such directive:</p>
</div>
<code-tabs><code-tab data-tab='XML'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="xml"><span class="nt">&lt;bean</span> <span class="na">id=</span><span class="s">"cache1_persistence_settings"</span> <span class="na">class=</span><span class="s">"org.apache.ignite.cache.store.cassandra.utils.persistence.KeyValuePersistenceSettings"</span><span class="nt">&gt;</span>
<span class="nt">&lt;constructor-arg</span> <span class="na">type=</span><span class="s">"org.springframework.core.io.Resource"</span> <span class="na">value=</span><span class="s">"classpath:org/apache/ignite/tests/persistence/blob/persistence-settings-1.xml"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;/bean&gt;</span></code></pre>
</div>
</div></code-tab></code-tabs>
<div class="paragraph">
<p>Now lets look at the specification of <code>cassandraAdminDataSource</code> from <code>store/src/test/resources/org/apache/ignite/tests/cassandra/connection-settings.xml</code>
test resource.</p>
</div>
<div class="paragraph">
<p>Specifically,<code>CassandraAdminCredentials</code> and <code>CassandraRegularCredentials</code> are classes which extend
<code>org.apache.ignite.cache.store.cassandra.datasource.Credentials</code>. You are welcome to implement these classes and reference them afterwards.</p>
</div>
<code-tabs><code-tab data-tab='XML'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="xml"><span class="cp">&lt;?xml version="1.0" encoding="UTF-8"?&gt;</span>
<span class="nt">&lt;beans</span> <span class="na">xmlns=</span><span class="s">"http://www.springframework.org/schema/beans"</span>
<span class="na">xmlns:xsi=</span><span class="s">"http://www.w3.org/2001/XMLSchema-instance"</span>
<span class="na">xsi:schemaLocation=</span><span class="s">"
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd"</span><span class="nt">&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">id=</span><span class="s">"cassandraAdminCredentials"</span> <span class="na">class=</span><span class="s">"org.my.project.CassandraAdminCredentials"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">id=</span><span class="s">"cassandraRegularCredentials"</span> <span class="na">class=</span><span class="s">"org.my.project.CassandraRegularCredentials"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">id=</span><span class="s">"loadBalancingPolicy"</span> <span class="na">class=</span><span class="s">"com.datastax.driver.core.policies.TokenAwarePolicy"</span><span class="nt">&gt;</span>
<span class="nt">&lt;constructor-arg</span> <span class="na">type=</span><span class="s">"com.datastax.driver.core.policies.LoadBalancingPolicy"</span><span class="nt">&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"com.datastax.driver.core.policies.RoundRobinPolicy"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/constructor-arg&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">id=</span><span class="s">"contactPoints"</span> <span class="na">class=</span><span class="s">"org.apache.ignite.tests.utils.CassandraHelper"</span> <span class="na">factory-method=</span><span class="s">"getContactPointsArray"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">id=</span><span class="s">"cassandraAdminDataSource"</span> <span class="na">class=</span><span class="s">"org.apache.ignite.cache.store.cassandra.datasource.DataSource"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"credentials"</span> <span class="na">ref=</span><span class="s">"cassandraAdminCredentials"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"contactPoints"</span> <span class="na">ref=</span><span class="s">"contactPoints"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"readConsistency"</span> <span class="na">value=</span><span class="s">"ONE"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"writeConsistency"</span> <span class="na">value=</span><span class="s">"ONE"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"loadBalancingPolicy"</span> <span class="na">ref=</span><span class="s">"loadBalancingPolicy"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">id=</span><span class="s">"cassandraRegularDataSource"</span> <span class="na">class=</span><span class="s">"org.apache.ignite.cache.store.cassandra.datasource.DataSource"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"credentials"</span> <span class="na">ref=</span><span class="s">"cassandraRegularCredentials"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"contactPoints"</span> <span class="na">ref=</span><span class="s">"contactPoints"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"readConsistency"</span> <span class="na">value=</span><span class="s">"ONE"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"writeConsistency"</span> <span class="na">value=</span><span class="s">"ONE"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"loadBalancingPolicy"</span> <span class="na">ref=</span><span class="s">"loadBalancingPolicy"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;/beans&gt;</span></code></pre>
</div>
</div></code-tab></code-tabs>
<div class="paragraph">
<p>For more details about Cassandra data source connection configuration visit the <a href="/docs/latest/extensions-and-integrations/cassandra/configuration">integration configuration page</a>.</p>
</div>
<div class="paragraph">
<p>Finally, the last piece which wasn&#8217;t still described is persistence settings configuration. Lets look at the
<code>cache1_persistence_settings</code> from the <code>org/apache/ignite/tests/persistence/blob/persistence-settings-1.xml</code> test resource.</p>
</div>
<code-tabs><code-tab data-tab='XML'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="xml"><span class="nt">&lt;persistence</span> <span class="na">keyspace=</span><span class="s">"test1"</span> <span class="na">table=</span><span class="s">"blob_test1"</span><span class="nt">&gt;</span>
<span class="nt">&lt;keyPersistence</span> <span class="na">class=</span><span class="s">"java.lang.Integer"</span> <span class="na">strategy=</span><span class="s">"PRIMITIVE"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;valuePersistence</span> <span class="na">strategy=</span><span class="s">"BLOB"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/persistence&gt;</span></code></pre>
</div>
</div></code-tab></code-tabs>
<div class="paragraph">
<p>In the configuration above, we can see that Cassandra <code>test1.blob_test1</code> table will be used to store key/value objects for
<strong>cache1</strong> cache. Key objects of the cache will be stored as <strong>integer</strong> in <code>key</code> column. Value objects of the cache will be
stored as <strong>blob</strong> in <code>value</code> column. For more information about persistence settings configuration visit the
<a href="/docs/latest/extensions-and-integrations/cassandra/configuration">integration configuration page</a>.</p>
</div>
<div class="paragraph">
<p>Next sections will provide examples of persistence settings configuration for different kind of persistence strategies
(see more details about persistence strategies on the <a href="/docs/latest/extensions-and-integrations/cassandra/configuration">integration configuration page</a>.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="example-1">Example 1</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Persistence setting for Ignite cache with keys of <code>Integer</code> type to be persisted as <code>int</code> in Cassandra and values of
<code>String</code> type to be persisted as <code>text</code> in Cassandra.</p>
</div>
<code-tabs><code-tab data-tab='XML'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="xml"><span class="nt">&lt;persistence</span> <span class="na">keyspace=</span><span class="s">"test1"</span> <span class="na">table=</span><span class="s">"my_table"</span><span class="nt">&gt;</span>
<span class="nt">&lt;keyPersistence</span> <span class="na">class=</span><span class="s">"java.lang.Integer"</span> <span class="na">strategy=</span><span class="s">"PRIMITIVE"</span> <span class="na">column=</span><span class="s">"my_key"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;valuePersistence</span> <span class="na">class=</span><span class="s">"java.lang.String"</span> <span class="na">strategy=</span><span class="s">"PRIMITIVE"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;/persistence&gt;</span></code></pre>
</div>
</div></code-tab></code-tabs>
<div class="paragraph">
<p>Keys will be stored in <code>my_key</code> column. Values will be stored in <code>value</code> column (which is used by default if <code>column</code> attribute wasn&#8217;t specified).</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="example-2">Example 2</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Persistence setting for Ignite cache with keys of <code>Integer</code> type to be persisted as <code>int</code> in Cassandra and values of <code>any</code>
type (you don&#8217;t need to specify the type for <strong>BLOB</strong> persistence strategy) to be persisted as <code>blob</code> in Cassandra.
The only solution for this situation is to store value as a <code>BLOB</code> in Cassandra table.</p>
</div>
<code-tabs><code-tab data-tab='XML'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="xml"><span class="nt">&lt;persistence</span> <span class="na">keyspace=</span><span class="s">"test1"</span> <span class="na">table=</span><span class="s">"my_table"</span><span class="nt">&gt;</span>
<span class="nt">&lt;keyPersistence</span> <span class="na">class=</span><span class="s">"java.lang.Integer"</span> <span class="na">strategy=</span><span class="s">"PRIMITIVE"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;valuePersistence</span> <span class="na">strategy=</span><span class="s">"BLOB"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/persistence&gt;</span></code></pre>
</div>
</div></code-tab></code-tabs>
<div class="paragraph">
<p>Keys will be stored in <code>key</code> column (which is used by default if <code>column</code> attribute wasn&#8217;t specified). Values will be stored in <code>value</code> column.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="example-3">Example 3</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Persistence setting for Ignite cache with keys of <code>Integer</code> type and values of <strong>any</strong> type, both to be persisted as <code>BLOB</code> in Cassandra.</p>
</div>
<code-tabs><code-tab data-tab='XML'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="xml"><span class="nt">&lt;persistence</span> <span class="na">keyspace=</span><span class="s">"test1"</span> <span class="na">table=</span><span class="s">"my_table"</span><span class="nt">&gt;</span>
<span class="c">&lt;!-- By default Java standard serialization is going to be used --&gt;</span>
<span class="nt">&lt;keyPersistence</span> <span class="na">class=</span><span class="s">"java.lang.Integer"</span>
<span class="na">strategy=</span><span class="s">"BLOB"</span><span class="nt">/&gt;</span>
<span class="c">&lt;!-- Kryo serialization specified to be used --&gt;</span>
<span class="nt">&lt;valuePersistence</span> <span class="na">class=</span><span class="s">"org.apache.ignite.tests.pojos.Person"</span>
<span class="na">strategy=</span><span class="s">"BLOB"</span>
<span class="na">serializer=</span><span class="s">"org.apache.ignite.cache.store.cassandra.serializer.KryoSerializer"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/persistence&gt;</span></code></pre>
</div>
</div></code-tab></code-tabs>
<div class="paragraph">
<p>Keys will be stored in <code>key</code> column having <code>blob</code> type and using
<a href="https://docs.oracle.com/javase/tutorial/jndi/objects/serial.html" target="_blank" rel="noopener">Java standard serialization</a>. Values will be stored in
<code>value</code> column having <code>blob</code> type and using <a href="https://github.com/EsotericSoftware/kryo" target="_blank" rel="noopener">Kryo serialization</a>.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="example-4">Example 4</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Persistence setting for Ignite cache with keys of <code>Integer</code> type to be persisted as <code>int</code> in Cassandra and values of custom
POJO <code>org.apache.ignite.tests.pojos.Person</code> type to be dynamically analyzed and persisted into a set of table columns,
so that each POJO field will be mapped to appropriate table column. For more details about dynamic POJO fields discovery
refer to <a href="/docs/latest/extensions-and-integrations/cassandra/configuration#persistencesettingsbean">PersistenceSettingsBean</a> documentation section.</p>
</div>
<code-tabs><code-tab data-tab='XML'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="xml"><span class="nt">&lt;persistence</span> <span class="na">keyspace=</span><span class="s">"test1"</span> <span class="na">table=</span><span class="s">"my_table"</span><span class="nt">&gt;</span>
<span class="nt">&lt;keyPersistence</span> <span class="na">class=</span><span class="s">"java.lang.Integer"</span> <span class="na">strategy=</span><span class="s">"PRIMITIVE"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;valuePersistence</span> <span class="na">class=</span><span class="s">"org.apache.ignite.tests.pojos.Person"</span> <span class="na">strategy=</span><span class="s">"POJO"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/persistence&gt;</span></code></pre>
</div>
</div></code-tab></code-tabs>
<div class="paragraph">
<p>Keys will be stored in <code>key</code> column having <code>int</code> type.</p>
</div>
<div class="paragraph">
<p>Now lets imagine that the <code>org.apache.ignite.tests.pojos.Person</code> class has such an implementation:</p>
</div>
<code-tabs><code-tab data-tab='Java'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="java"><span class="kd">public</span> <span class="kd">class</span> <span class="nc">Person</span> <span class="o">{</span>
<span class="kd">private</span> <span class="nc">String</span> <span class="n">firstName</span><span class="o">;</span>
<span class="kd">private</span> <span class="nc">String</span> <span class="n">lastName</span><span class="o">;</span>
<span class="kd">private</span> <span class="kt">int</span> <span class="n">age</span><span class="o">;</span>
<span class="kd">private</span> <span class="kt">boolean</span> <span class="n">married</span><span class="o">;</span>
<span class="kd">private</span> <span class="kt">long</span> <span class="n">height</span><span class="o">;</span>
<span class="kd">private</span> <span class="kt">float</span> <span class="n">weight</span><span class="o">;</span>
<span class="kd">private</span> <span class="nc">Date</span> <span class="n">birthDate</span><span class="o">;</span>
<span class="kd">private</span> <span class="nc">List</span><span class="o">&lt;</span><span class="nc">String</span><span class="o">&gt;</span> <span class="n">phones</span><span class="o">;</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">setFirstName</span><span class="o">(</span><span class="nc">String</span> <span class="n">name</span><span class="o">)</span> <span class="o">{</span>
<span class="n">firstName</span> <span class="o">=</span> <span class="n">name</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="nc">String</span> <span class="nf">getFirstName</span><span class="o">()</span> <span class="o">{</span>
<span class="k">return</span> <span class="n">firstName</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">setLastName</span><span class="o">(</span><span class="nc">String</span> <span class="n">name</span><span class="o">)</span> <span class="o">{</span>
<span class="n">lastName</span> <span class="o">=</span> <span class="n">name</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="nc">String</span> <span class="nf">getLastName</span><span class="o">()</span> <span class="o">{</span>
<span class="k">return</span> <span class="n">lastName</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">setAge</span><span class="o">(</span><span class="kt">int</span> <span class="n">age</span><span class="o">)</span> <span class="o">{</span>
<span class="k">this</span><span class="o">.</span><span class="na">age</span> <span class="o">=</span> <span class="n">age</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="kt">int</span> <span class="nf">getAge</span><span class="o">()</span> <span class="o">{</span>
<span class="k">return</span> <span class="n">age</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">setMarried</span><span class="o">(</span><span class="kt">boolean</span> <span class="n">married</span><span class="o">)</span> <span class="o">{</span>
<span class="k">this</span><span class="o">.</span><span class="na">married</span> <span class="o">=</span> <span class="n">married</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="kt">boolean</span> <span class="nf">getMarried</span><span class="o">()</span> <span class="o">{</span>
<span class="k">return</span> <span class="n">married</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">setHeight</span><span class="o">(</span><span class="kt">long</span> <span class="n">height</span><span class="o">)</span> <span class="o">{</span>
<span class="k">this</span><span class="o">.</span><span class="na">height</span> <span class="o">=</span> <span class="n">height</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="kt">long</span> <span class="nf">getHeight</span><span class="o">()</span> <span class="o">{</span>
<span class="k">return</span> <span class="n">height</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">setWeight</span><span class="o">(</span><span class="kt">float</span> <span class="n">weight</span><span class="o">)</span> <span class="o">{</span>
<span class="k">this</span><span class="o">.</span><span class="na">weight</span> <span class="o">=</span> <span class="n">weight</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="kt">float</span> <span class="nf">getWeight</span><span class="o">()</span> <span class="o">{</span>
<span class="k">return</span> <span class="n">weight</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">setBirthDate</span><span class="o">(</span><span class="nc">Date</span> <span class="n">date</span><span class="o">)</span> <span class="o">{</span>
<span class="n">birthDate</span> <span class="o">=</span> <span class="n">date</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="nc">Date</span> <span class="nf">getBirthDate</span><span class="o">()</span> <span class="o">{</span>
<span class="k">return</span> <span class="n">birthDate</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">setPhones</span><span class="o">(</span><span class="nc">List</span><span class="o">&lt;</span><span class="nc">String</span><span class="o">&gt;</span> <span class="n">phones</span><span class="o">)</span> <span class="o">{</span>
<span class="k">this</span><span class="o">.</span><span class="na">phones</span> <span class="o">=</span> <span class="n">phones</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="nc">List</span><span class="o">&lt;</span><span class="nc">String</span><span class="o">&gt;</span> <span class="nf">getPhones</span><span class="o">()</span> <span class="o">{</span>
<span class="k">return</span> <span class="n">phones</span><span class="o">;</span>
<span class="o">}</span>
<span class="o">}</span></code></pre>
</div>
</div></code-tab></code-tabs>
<div class="paragraph">
<p>In this case Ignite cache values of the <code>org.apache.ignite.tests.pojos.Person</code> type will be persisted into a set of
Cassandra table columns using such dynamically configured mapping rule:</p>
</div>
<table class="tableblock frame-all grid-all stripes-even stretch">
<colgroup>
<col style="width: 33.3333%;">
<col style="width: 33.3333%;">
<col style="width: 33.3334%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">POJO field</th>
<th class="tableblock halign-left valign-top">Table column</th>
<th class="tableblock halign-left valign-top">Column type</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">firstName</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">firstname</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">text</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">lastName</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">lastname</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">text</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">age</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">age</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">int</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">married</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">married</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">boolean</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">height</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">height</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">bigint</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">weight</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">weight</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">float</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">birthDate</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">birthdate</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">timestamp</p></td>
</tr>
</tbody>
</table>
<div class="paragraph">
<p>As you can see from the table above, <code>phones</code> field will not be persisted into table. That&#8217;s because it&#8217;s not of simple
java type which could be directly mapped to <a href="http://docs.datastax.com/en/developer/java-driver/1.0/java-driver/reference/javaClass2Cql3Datatypes_r.html" target="_blank" rel="noopener">appropriate</a> Cassandra type.
Such kind of fields could be persisted into Cassandra only if you manually specify all mapping details for the object type
and if field type itself is implementing <code>java.io.Serializable</code> interface. In a such case field will be persisted into a
separate table column as <code>blob</code>. See more details in the next example.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="example-5">Example 5</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Persistence setting for Ignite cache with keys of custom POJO <code>org.apache.ignite.tests.pojos.PersonId</code> and values of
custom POJO <code>org.apache.ignite.tests.pojos.Person</code> types, both to be persisted into a set of table columns based on
manually specified mapping rules.</p>
</div>
<code-tabs><code-tab data-tab='XML'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="xml"><span class="nt">&lt;persistence</span> <span class="na">keyspace=</span><span class="s">"test1"</span> <span class="na">table=</span><span class="s">"my_table"</span> <span class="na">ttl=</span><span class="s">"86400"</span><span class="nt">&gt;</span>
<span class="c">&lt;!-- Cassandra keyspace options which should be used to create provided keyspace if it doesn't exist --&gt;</span>
<span class="nt">&lt;keyspaceOptions&gt;</span>
REPLICATION = {'class' : 'SimpleStrategy', 'replication_factor' : 3}
AND DURABLE_WRITES = true
<span class="nt">&lt;/keyspaceOptions&gt;</span>
<span class="c">&lt;!-- Cassandra table options which should be used to create provided table if it doesn't exist --&gt;</span>
<span class="nt">&lt;tableOptions&gt;</span>
comment = 'A most excellent and useful table'
AND read_repair_chance = 0.2
<span class="nt">&lt;/tableOptions&gt;</span>
<span class="c">&lt;!-- Persistent settings for Ignite cache keys --&gt;</span>
<span class="nt">&lt;keyPersistence</span> <span class="na">class=</span><span class="s">"org.apache.ignite.tests.pojos.PersonId"</span> <span class="na">strategy=</span><span class="s">"POJO"</span><span class="nt">&gt;</span>
<span class="c">&lt;!-- Partition key fields if POJO strategy used --&gt;</span>
<span class="nt">&lt;partitionKey&gt;</span>
<span class="c">&lt;!-- Mapping from POJO field to Cassandra table column --&gt;</span>
<span class="nt">&lt;field</span> <span class="na">name=</span><span class="s">"companyCode"</span> <span class="na">column=</span><span class="s">"company"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;field</span> <span class="na">name=</span><span class="s">"departmentCode"</span> <span class="na">column=</span><span class="s">"department"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;/partitionKey&gt;</span>
<span class="c">&lt;!-- Cluster key fields if POJO strategy used --&gt;</span>
<span class="nt">&lt;clusterKey&gt;</span>
<span class="c">&lt;!-- Mapping from POJO field to Cassandra table column --&gt;</span>
<span class="nt">&lt;field</span> <span class="na">name=</span><span class="s">"personNumber"</span> <span class="na">column=</span><span class="s">"number"</span> <span class="na">sort=</span><span class="s">"desc"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/clusterKey&gt;</span>
<span class="nt">&lt;/keyPersistence&gt;</span>
<span class="c">&lt;!-- Persistent settings for Ignite cache values --&gt;</span>
<span class="nt">&lt;valuePersistence</span> <span class="na">class=</span><span class="s">"org.apache.ignite.tests.pojos.Person"</span>
<span class="na">strategy=</span><span class="s">"POJO"</span>
<span class="na">serializer=</span><span class="s">"org.apache.ignite.cache.store.cassandra.serializer.KryoSerializer"</span><span class="nt">&gt;</span>
<span class="c">&lt;!-- Mapping from POJO field to Cassandra table column --&gt;</span>
<span class="nt">&lt;field</span> <span class="na">name=</span><span class="s">"firstName"</span> <span class="na">column=</span><span class="s">"first_name"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;field</span> <span class="na">name=</span><span class="s">"lastName"</span> <span class="na">column=</span><span class="s">"last_name"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;field</span> <span class="na">name=</span><span class="s">"age"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;field</span> <span class="na">name=</span><span class="s">"married"</span> <span class="na">index=</span><span class="s">"true"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;field</span> <span class="na">name=</span><span class="s">"height"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;field</span> <span class="na">name=</span><span class="s">"weight"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;field</span> <span class="na">name=</span><span class="s">"birthDate"</span> <span class="na">column=</span><span class="s">"birth_date"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;field</span> <span class="na">name=</span><span class="s">"phones"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;/valuePersistence&gt;</span>
<span class="nt">&lt;/persistence&gt;</span></code></pre>
</div>
</div></code-tab></code-tabs>
<div class="paragraph">
<p>These persistence settings looks rather complicated. Lets go step by step and analyse them.</p>
</div>
<div class="paragraph">
<p>Lets first look at the root tag:</p>
</div>
<code-tabs><code-tab data-tab='XML'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="xml"><span class="nt">&lt;persistence</span> <span class="na">keyspace=</span><span class="s">"test1"</span> <span class="na">table=</span><span class="s">"my_table"</span> <span class="na">ttl=</span><span class="s">"86400"</span><span class="nt">&gt;</span></code></pre>
</div>
</div></code-tab></code-tabs>
<div class="paragraph">
<p>It specifies that Ignite cache keys and values should be stored in <code>test1.my_table</code> table and that data in each row
<a href="http://docs.datastax.com/en/cql/3.1/cql/cql_using/use_expire_c.html" target="_blank" rel="noopener">expires</a> after <code>86400</code> sec which is <code>24</code> hours.</p>
</div>
<div class="paragraph">
<p>Then we can see the advanced settings for Cassandra keyspace. The setting will be used to create keyspace if it&#8217;s not exist.</p>
</div>
<code-tabs><code-tab data-tab='XML'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="xml"><span class="nt">&lt;keyspaceOptions&gt;</span>
REPLICATION = {'class' : 'SimpleStrategy', 'replication_factor' : 3}
AND DURABLE_WRITES = true
<span class="nt">&lt;/keyspaceOptions&gt;</span></code></pre>
</div>
</div></code-tab></code-tabs>
<div class="paragraph">
<p>Then by analogy to keyspace setting we can see table advanced setting, which will be used only for table creation.</p>
</div>
<code-tabs><code-tab data-tab='XML'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="xml"><span class="nt">&lt;tableOptions&gt;</span>
comment = 'A most excellent and useful table'
AND read_repair_chance = 0.2
<span class="nt">&lt;/tableOptions&gt;</span></code></pre>
</div>
</div></code-tab></code-tabs>
<div class="paragraph">
<p>Next section specifies how Ignite cache keys should be persisted:</p>
</div>
<code-tabs><code-tab data-tab='XML'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="xml"><span class="nt">&lt;keyPersistence</span> <span class="na">class=</span><span class="s">"org.apache.ignite.tests.pojos.PersonId"</span> <span class="na">strategy=</span><span class="s">"POJO"</span><span class="nt">&gt;</span>
<span class="c">&lt;!-- Partition key fields if POJO strategy used --&gt;</span>
<span class="nt">&lt;partitionKey&gt;</span>
<span class="c">&lt;!-- Mapping from POJO field to Cassandra table column --&gt;</span>
<span class="nt">&lt;field</span> <span class="na">name=</span><span class="s">"companyCode"</span> <span class="na">column=</span><span class="s">"company"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;field</span> <span class="na">name=</span><span class="s">"departmentCode"</span> <span class="na">column=</span><span class="s">"department"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;/partitionKey&gt;</span>
<span class="c">&lt;!-- Cluster key fields if POJO strategy used --&gt;</span>
<span class="nt">&lt;clusterKey&gt;</span>
<span class="c">&lt;!-- Mapping from POJO field to Cassandra table column --&gt;</span>
<span class="nt">&lt;field</span> <span class="na">name=</span><span class="s">"personNumber"</span> <span class="na">column=</span><span class="s">"number"</span> <span class="na">sort=</span><span class="s">"desc"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/clusterKey&gt;</span>
<span class="nt">&lt;/keyPersistence&gt;</span></code></pre>
</div>
</div></code-tab></code-tabs>
<div class="paragraph">
<p>Lets assume that <code>org.apache.ignite.tests.pojos.PersonId</code> has such implementation:</p>
</div>
<code-tabs><code-tab data-tab='Java'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="java"><span class="kd">public</span> <span class="kd">class</span> <span class="nc">PersonId</span> <span class="o">{</span>
<span class="kd">private</span> <span class="nc">String</span> <span class="n">companyCode</span><span class="o">;</span>
<span class="kd">private</span> <span class="nc">String</span> <span class="n">departmentCode</span><span class="o">;</span>
<span class="kd">private</span> <span class="kt">int</span> <span class="n">personNumber</span><span class="o">;</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">setCompanyCode</span><span class="o">(</span><span class="nc">String</span> <span class="n">code</span><span class="o">)</span> <span class="o">{</span>
<span class="n">companyCode</span> <span class="o">=</span> <span class="n">code</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="nc">String</span> <span class="nf">getCompanyCode</span><span class="o">()</span> <span class="o">{</span>
<span class="k">return</span> <span class="n">companyCode</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">setDepartmentCode</span><span class="o">(</span><span class="nc">String</span> <span class="n">code</span><span class="o">)</span> <span class="o">{</span>
<span class="n">departmentCode</span> <span class="o">=</span> <span class="n">code</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="nc">String</span> <span class="nf">getDepartmentCode</span><span class="o">()</span> <span class="o">{</span>
<span class="k">return</span> <span class="n">departmentCode</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">setPersonNumber</span><span class="o">(</span><span class="kt">int</span> <span class="n">number</span><span class="o">)</span> <span class="o">{</span>
<span class="n">personNumber</span> <span class="o">=</span> <span class="n">number</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="kt">int</span> <span class="nf">getPersonNumber</span><span class="o">()</span> <span class="o">{</span>
<span class="k">return</span> <span class="n">personNumber</span><span class="o">;</span>
<span class="o">}</span>
<span class="o">}</span></code></pre>
</div>
</div></code-tab></code-tabs>
<div class="paragraph">
<p>In such case Ignite cache keys of <code>org.apache.ignite.tests.pojos.PersonId</code> type will be persisted into a set of Cassandra
table columns representing <code>PARTITION</code> and <code>CLUSTER</code> key using this mapping rule:</p>
</div>
<table class="tableblock frame-all grid-all stripes-even stretch">
<colgroup>
<col style="width: 33.3333%;">
<col style="width: 33.3333%;">
<col style="width: 33.3334%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">POJO field</th>
<th class="tableblock halign-left valign-top">Table column</th>
<th class="tableblock halign-left valign-top">Column type</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">companyCode</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">company</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">text</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">departmentCode</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">department</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">text</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">personNumber</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">number</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">int</p></td>
</tr>
</tbody>
</table>
<div class="paragraph">
<p>In addition to that, combination of columns <code>(company, department)</code> will be used as Cassandra <code>PARTITION</code> key and column
<code>number</code> will be used as a <code>CLUSTER</code> key sorted in descending order.</p>
</div>
<div class="paragraph">
<p>Finally lets move to the last section, which specifies persistence settings for Ignite cache values:</p>
</div>
<code-tabs><code-tab data-tab='XML'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="xml"><span class="nt">&lt;valuePersistence</span> <span class="na">class=</span><span class="s">"org.apache.ignite.tests.pojos.Person"</span>
<span class="na">strategy=</span><span class="s">"POJO"</span>
<span class="na">serializer=</span><span class="s">"org.apache.ignite.cache.store.cassandra.serializer.KryoSerializer"</span><span class="nt">&gt;</span>
<span class="c">&lt;!-- Mapping from POJO field to Cassandra table column --&gt;</span>
<span class="nt">&lt;field</span> <span class="na">name=</span><span class="s">"firstName"</span> <span class="na">column=</span><span class="s">"first_name"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;field</span> <span class="na">name=</span><span class="s">"lastName"</span> <span class="na">column=</span><span class="s">"last_name"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;field</span> <span class="na">name=</span><span class="s">"age"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;field</span> <span class="na">name=</span><span class="s">"married"</span> <span class="na">index=</span><span class="s">"true"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;field</span> <span class="na">name=</span><span class="s">"height"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;field</span> <span class="na">name=</span><span class="s">"weight"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;field</span> <span class="na">name=</span><span class="s">"birthDate"</span> <span class="na">column=</span><span class="s">"birth_date"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;field</span> <span class="na">name=</span><span class="s">"phones"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;/valuePersistence&gt;</span></code></pre>
</div>
</div></code-tab></code-tabs>
<div class="paragraph">
<p>Lets assume <code>that org.apache.ignite.tests.pojos.Person</code> class has the same implementation like in <a href="/docs/latest/extensions-and-integrations/cassandra/usage-examples#example-4">Example 4</a>.
In this case Ignite cache values of <code>org.apache.ignite.tests.pojos.Person</code> type will be persisted into a set of Cassandra
table columns using such mapping rule:</p>
</div>
<table class="tableblock frame-all grid-all stripes-even stretch">
<colgroup>
<col style="width: 33.3333%;">
<col style="width: 33.3333%;">
<col style="width: 33.3334%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">POJO field</th>
<th class="tableblock halign-left valign-top">Table column</th>
<th class="tableblock halign-left valign-top">Column type</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">firstName</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">first_name</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">text</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">lastName</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">last_name</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">text</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">age</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">age</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">int</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">married</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">married</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">boolean</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">height</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">height</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">bigint</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">weight</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">weight</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">float</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">birthDate</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">birth_date</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">timestamp</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">phones</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">phones</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">blob</p></td>
</tr>
</tbody>
</table>
<div class="paragraph">
<p>Comparing to <a href="/docs/latest/extensions-and-integrations/cassandra/usage-examples#example-4">Example 4</a> we can see that now <code>phones</code>
field will be serialized to <code>phones</code> column of <code>blob</code> type using <a href="https://github.com/EsotericSoftware/kryo" target="_blank" rel="noopener">Kryo</a> serializer.
In addition to that, Cassandra secondary index will be created for the <code>married</code> column.</p>
</div>
</div>
</div>
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© 2020 The Apache Software Foundation.<br/>
Apache, Apache Ignite, the Apache feather and the Apache Ignite logo are either registered trademarks or trademarks of The Apache Software Foundation.
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