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| class='' |
| >Troubleshooting and Debugging</a> |
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| class='' |
| >Handling Exceptions</a> |
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| class='' |
| >Benchmarking With Yardstick</a> |
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| <div class="left-nav__overlay"></div> |
| |
| |
| <article data-swiftype-index='true'> |
| <a class='edit-link' href="https://github.com/apache/ignite/tree/IGNITE-7595/docs/_docs/extensions-and-integrations/hibernate-l2-cache.adoc" target="_blank">Edit</a> |
| |
| <h1>Apache Ignite Hibernate L2 Cache</h1> |
| |
| <div class="sect1"> |
| <h2 id="overview">Overview</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Apache Ignite can be used as a <a href="http://hibernate.org" target="_blank" rel="noopener">Hibernate</a> second-Level cache, |
| which can significantly speed-up the persistence layer of your application.</p> |
| </div> |
| <div class="paragraph"> |
| <p>All work with Hibernate database-mapped objects is done within a session, usually bound to a worker thread or a Web session. |
| By default, Hibernate only uses per-session (L1) cache, so, objects, cached in one session, are not seen in another. |
| However, an L2 cache may be used, in which the cached objects are seen for all sessions that use |
| the same L2 cache configuration. This usually gives a significantly greater performance gain, because each newly-created |
| session can take full advantage of the data already present in L2 cache memory (which outlives any session-local L1 cache).</p> |
| </div> |
| <div class="imageblock"> |
| <div class="content"> |
| <img src="/docs/2.12.0/images/integrations/hibernate-l2-cache.png" alt="Ignite Cluster"> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>While the L1 cache is always enabled and fully implemented by Hibernate internally, L2 cache is optional and can have |
| multiple pluggable implementaions. Ignite can be easily plugged-in as an L2 cache implementation, and can be used in all |
| access modes (<code>READ_ONLY</code>, <code>READ_WRITE</code>, <code>NONSTRICT_READ_WRITE</code>, and <code>TRANSACTIONAL</code>), supporting a wide range of related features:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>caching to memory and disk, as well as off-heap memory.</p> |
| </li> |
| <li> |
| <p>cache transactions, that make <code>TRANSACTIONAL</code> mode possible.</p> |
| </li> |
| <li> |
| <p>clustering, with 2 different replication modes: <code>REPLICATED</code> and <code>PARTITIONED</code></p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>To start using GridGain as a Hibernate L2 cache, you need to perform 3 simple steps:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Add Ignite libraries to your application’s classpath.</p> |
| </li> |
| <li> |
| <p>Enable L2 cache and specify Ignite implementation class in L2 cache configuration.</p> |
| </li> |
| <li> |
| <p>Configure Ignite caches for L2 cache regions and start the embedded Ignite node (and, optionally, external Ignite nodes).</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>In the section below we cover these steps in more detail.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="l2-cache-configuration">L2 Cache Configuration</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>To configure Ignite with as a Hibernate L2 cache, without any changes required to the existing Hibernate code, you need to:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Add either <code>ignite-hibernate_5.3</code> or <code>ignite-hibernate_4.2</code> module as a dependency to your project depending on whether |
| Hibernate 5 or Hibernate 4 is used. Alternatively, you can copy JAR files of the same name from |
| <code>{apache_ignite_relese}/libs/optional</code> to <code>{apache_ignite_relese}/libs</code> folder if you start an Apache Ignite node |
| from a command line.</p> |
| </li> |
| <li> |
| <p>Configure Hibernate itself to use Ignite as an L2 cache.</p> |
| </li> |
| <li> |
| <p>Configure Ignite caches appropriately.</p> |
| </li> |
| </ul> |
| </div> |
| <div class="sect2"> |
| <h3 id="maven-configuration">Maven Configuration</h3> |
| <div class="paragraph"> |
| <p>To add Apache Ignite Hibernate integration to your project, add the following dependency to your pom.xml file:</p> |
| </div> |
| <code-tabs><code-tab data-tab='Hibernate 5'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="xml"><span class="nt"><dependency></span> |
| <span class="nt"><groupId></span>org.apache.ignite<span class="nt"></groupId></span> |
| <span class="nt"><artifactId></span>ignite-hibernate_5.3<span class="nt"></artifactId></span> |
| <span class="nt"><version></span>${ignite.version}<span class="nt"></version></span> |
| <span class="nt"></dependency></span></code></pre> |
| </div> |
| </div></code-tab><code-tab data-tab='Hibernate 4'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="xml"><span class="nt"><dependency></span> |
| <span class="nt"><groupId></span>org.apache.ignite<span class="nt"></groupId></span> |
| <span class="nt"><artifactId></span>ignite-hibernate_4.2<span class="nt"></artifactId></span> |
| <span class="nt"><version></span>${ignite.version}<span class="nt"></version></span> |
| <span class="nt"></dependency></span></code></pre> |
| </div> |
| </div></code-tab></code-tabs> |
| </div> |
| <div class="sect2"> |
| <h3 id="hibernate-configuration-example">Hibernate Configuration Example</h3> |
| <div class="paragraph"> |
| <p>A typical Hibernate configuration for L2 cache with Ignite would look like the one below:</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"><hibernate-configuration></span> |
| <span class="nt"><session-factory></span> |
| ... |
| <span class="c"><!-- Enable L2 cache. --></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"cache.use_second_level_cache"</span><span class="nt">></span>true<span class="nt"></property></span> |
| |
| <span class="c"><!-- Generate L2 cache statistics. --></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"generate_statistics"</span><span class="nt">></span>true<span class="nt"></property></span> |
| |
| <span class="c"><!-- Specify Ignite as L2 cache provider. --></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"cache.region.factory_class"</span><span class="nt">></span>org.apache.ignite.cache.hibernate.HibernateRegionFactory<span class="nt"></property></span> |
| |
| <span class="c"><!-- Specify the name of the grid, that will be used for second level caching. --></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"org.apache.ignite.hibernate.ignite_instance_name"</span><span class="nt">></span>hibernate-grid<span class="nt"></property></span> |
| |
| <span class="c"><!-- Set default L2 cache access type. --></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"org.apache.ignite.hibernate.default_access_type"</span><span class="nt">></span>READ_ONLY<span class="nt"></property></span> |
| |
| <span class="c"><!-- Specify the entity classes for mapping. --></span> |
| <span class="nt"><mapping</span> <span class="na">class=</span><span class="s">"com.mycompany.MyEntity1"</span><span class="nt">/></span> |
| <span class="nt"><mapping</span> <span class="na">class=</span><span class="s">"com.mycompany.MyEntity2"</span><span class="nt">/></span> |
| |
| <span class="c"><!-- Per-class L2 cache settings. --></span> |
| <span class="nt"><class-cache</span> <span class="na">class=</span><span class="s">"com.mycompany.MyEntity1"</span> <span class="na">usage=</span><span class="s">"read-only"</span><span class="nt">/></span> |
| <span class="nt"><class-cache</span> <span class="na">class=</span><span class="s">"com.mycompany.MyEntity2"</span> <span class="na">usage=</span><span class="s">"read-only"</span><span class="nt">/></span> |
| <span class="nt"><collection-cache</span> <span class="na">collection=</span><span class="s">"com.mycompany.MyEntity1.children"</span> <span class="na">usage=</span><span class="s">"read-only"</span><span class="nt">/></span> |
| ... |
| <span class="nt"></session-factory></span> |
| <span class="nt"></hibernate-configuration></span></code></pre> |
| </div> |
| </div></code-tab></code-tabs> |
| <div class="paragraph"> |
| <p>Here, we do the following:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Enable L2 cache (and, optionally, the L2 cache statistics generation).</p> |
| </li> |
| <li> |
| <p>Specify Ignite as L2 cache implementation.</p> |
| </li> |
| <li> |
| <p>Specify the name of the caching grid (should correspond to the one in Ignite configuration).</p> |
| </li> |
| <li> |
| <p>Specify the entity classes and configure caching for each class (a corresponding cache region should be configured in Ignite).</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="ignite-configuration-example">Ignite Configuration Example</h3> |
| <div class="paragraph"> |
| <p>A typical Ignite configuration for Hibernate L2 caching looks like this:</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="c"><!-- Basic configuration for atomic cache. --></span> |
| <span class="nt"><bean</span> <span class="na">id=</span><span class="s">"atomic-cache"</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.CacheConfiguration"</span> <span class="na">abstract=</span><span class="s">"true"</span><span class="nt">></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"cacheMode"</span> <span class="na">value=</span><span class="s">"PARTITIONED"</span><span class="nt">/></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"atomicityMode"</span> <span class="na">value=</span><span class="s">"ATOMIC"</span><span class="nt">/></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"writeSynchronizationMode"</span> <span class="na">value=</span><span class="s">"FULL_SYNC"</span><span class="nt">/></span> |
| <span class="nt"></bean></span> |
| |
| <span class="c"><!-- Basic configuration for transactional cache. --></span> |
| <span class="nt"><bean</span> <span class="na">id=</span><span class="s">"transactional-cache"</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.CacheConfiguration"</span> <span class="na">abstract=</span><span class="s">"true"</span><span class="nt">></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"cacheMode"</span> <span class="na">value=</span><span class="s">"PARTITIONED"</span><span class="nt">/></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"atomicityMode"</span> <span class="na">value=</span><span class="s">"TRANSACTIONAL"</span><span class="nt">/></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"writeSynchronizationMode"</span> <span class="na">value=</span><span class="s">"FULL_SYNC"</span><span class="nt">/></span> |
| <span class="nt"></bean></span> |
| |
| <span class="nt"><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">></span> |
| <span class="c"><!-- |
| Specify the name of the caching grid (should correspond to the |
| one in Hibernate configuration). |
| --></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"igniteInstanceName"</span> <span class="na">value=</span><span class="s">"hibernate-grid"</span><span class="nt">/></span> |
| ... |
| <span class="c"><!-- |
| Specify cache configuration for each L2 cache region (which corresponds |
| to a full class name or a full association name). |
| --></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"cacheConfiguration"</span><span class="nt">></span> |
| <span class="nt"><list></span> |
| <span class="c"><!-- |
| Configurations for entity caches. |
| --></span> |
| <span class="nt"><bean</span> <span class="na">parent=</span><span class="s">"transactional-cache"</span><span class="nt">></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"name"</span> <span class="na">value=</span><span class="s">"com.mycompany.MyEntity1"</span><span class="nt">/></span> |
| <span class="nt"></bean></span> |
| <span class="nt"><bean</span> <span class="na">parent=</span><span class="s">"transactional-cache"</span><span class="nt">></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"name"</span> <span class="na">value=</span><span class="s">"com.mycompany.MyEntity2"</span><span class="nt">/></span> |
| <span class="nt"></bean></span> |
| <span class="nt"><bean</span> <span class="na">parent=</span><span class="s">"transactional-cache"</span><span class="nt">></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"name"</span> <span class="na">value=</span><span class="s">"com.mycompany.MyEntity1.children"</span><span class="nt">/></span> |
| <span class="nt"></bean></span> |
| |
| <span class="c"><!-- Configuration for update timestamps cache. --></span> |
| <span class="nt"><bean</span> <span class="na">parent=</span><span class="s">"atomic-cache"</span><span class="nt">></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"name"</span> <span class="na">value=</span><span class="s">"org.hibernate.cache.spi.UpdateTimestampsCache"</span><span class="nt">/></span> |
| <span class="nt"></bean></span> |
| |
| <span class="c"><!-- Configuration for query result cache. --></span> |
| <span class="nt"><bean</span> <span class="na">parent=</span><span class="s">"atomic-cache"</span><span class="nt">></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"name"</span> <span class="na">value=</span><span class="s">"org.hibernate.cache.internal.StandardQueryCache"</span><span class="nt">/></span> |
| <span class="nt"></bean></span> |
| <span class="nt"></list></span> |
| <span class="nt"></property></span> |
| ... |
| <span class="nt"></bean></span></code></pre> |
| </div> |
| </div></code-tab></code-tabs> |
| <div class="paragraph"> |
| <p>Here, we specify the cache configuration for each L2 cache region:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>We use <code>PARTITIONED</code> cache to split the data between caching nodes. Another possible strategy is to enable <code>REPLICATED</code> mode, |
| thus replicating a full dataset between all caching nodes. See Cache Distribution Models for more information.</p> |
| </li> |
| <li> |
| <p>We specify the cache name that corresponds an L2 cache region name (either a full class name or a full association name).</p> |
| </li> |
| <li> |
| <p>We use <code>TRANSACTIONAL</code> atomicity mode to take advantage of cache transactions.</p> |
| </li> |
| <li> |
| <p>We enable <code>FULL_SYNC</code> to be always fully synchronized with backup nodes.</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>Additionally, we specify a cache for update timestamps, which may be <code>ATOMIC</code>, for better performance.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Having configured Ignite caching node, we can start it from within our code the following way:</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="nc">Ignition</span><span class="o">.</span><span class="na">start</span><span class="o">(</span><span class="s">"my-config-folder/my-ignite-configuration.xml"</span><span class="o">);</span></code></pre> |
| </div> |
| </div></code-tab></code-tabs> |
| <div class="paragraph"> |
| <p>After the above line is executed, the internal Ignite node is started and is ready to cache the data. We can also start |
| additional standalone nodes by running the following command from console:</p> |
| </div> |
| <code-tabs><code-tab data-tab='Unix'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="shell"><span class="nv">$IGNITE_HOME</span>/bin/ignite.sh my-config-folder/my-ignite-configuration.xml</code></pre> |
| </div> |
| </div></code-tab><code-tab data-tab='Windows'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="shell"><span class="nv">$IGNITE_HOME</span><span class="se">\b</span><span class="k">in</span><span class="se">\i</span>gnite.bat my-config-folder<span class="se">\m</span>y-ignite-configuration.xml</code></pre> |
| </div> |
| </div></code-tab></code-tabs> |
| <div class="admonitionblock note"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <div class="title">Note</div> |
| </td> |
| <td class="content"> |
| <div class="paragraph"> |
| <p>The nodes may be started on other hosts as well, forming a distributed caching cluster. |
| Be sure to specify the right network settings in GridGain configuration file for that.</p> |
| </div> |
| </td> |
| </tr> |
| </table> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="query-cache">Query Cache</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>In addition to L2 cache, Hibernate offers a query cache. This cache stores the results of queries (either HQL or Criteria) |
| with a given set of parameters, so, when you repeat the query with the same parameter set, it hits the cache without going to the database.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Query cache may be useful if you have a number of queries, which may repeat with the same parameter values. |
| Like in case of L2 cache, Hibernate relies on a 3-rd party cache implementation, and Ignite can be used as such.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="query-cache-configuration">Query Cache Configuration</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The configuration information above totally applies to query cache, but some additional configuration and code change is required.</p> |
| </div> |
| <div class="sect2"> |
| <h3 id="hibernate-configuration">Hibernate Configuration</h3> |
| <div class="paragraph"> |
| <p>To enable query cache in Hibernate, you only need one additional line in configuration file:</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="c"><!-- Enable query cache. --></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"cache.use_query_cache"</span><span class="nt">></span>true<span class="nt"></property></span></code></pre> |
| </div> |
| </div></code-tab></code-tabs> |
| <div class="paragraph"> |
| <p>Yet, a code modification is required: for each query that you want to cache, you should enable <code>cacheable</code> flag by calling <code>setCacheable(true)</code>:</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="nc">Session</span> <span class="n">ses</span> <span class="o">=</span> <span class="o">...;</span> |
| |
| <span class="c1">// Create Criteria query.</span> |
| <span class="nc">Criteria</span> <span class="n">criteria</span> <span class="o">=</span> <span class="n">ses</span><span class="o">.</span><span class="na">createCriteria</span><span class="o">(</span><span class="n">cls</span><span class="o">);</span> |
| |
| <span class="c1">// Enable cacheable flag.</span> |
| <span class="n">criteria</span><span class="o">.</span><span class="na">setCacheable</span><span class="o">(</span><span class="kc">true</span><span class="o">);</span> |
| |
| <span class="o">...</span></code></pre> |
| </div> |
| </div></code-tab></code-tabs> |
| <div class="paragraph"> |
| <p>After this is done, your query results will be cached.</p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="ignite-configuration">Ignite Configuration</h3> |
| <div class="paragraph"> |
| <p>To enable Hibernate query caching in Ignite, you need to specify an additional cache 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"><property</span> <span class="na">name=</span><span class="s">"cacheConfiguration"</span><span class="nt">></span> |
| <span class="nt"><list></span> |
| ... |
| <span class="c"><!-- Query cache (refers to atomic cache defined in above example). --></span> |
| <span class="nt"><bean</span> <span class="na">parent=</span><span class="s">"atomic-cache"</span><span class="nt">></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"name"</span> <span class="na">value=</span><span class="s">"org.hibernate.cache.internal.StandardQueryCache"</span><span class="nt">/></span> |
| <span class="nt"></bean></span> |
| <span class="nt"></list></span> |
| <span class="nt"></property></span></code></pre> |
| </div> |
| </div></code-tab></code-tabs> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="example">Example</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>See a complete <a href="https://github.com/apache/ignite/blob/master/examples/src/main/java-lgpl/org/apache/ignite/examples/datagrid/hibernate/HibernateL2CacheExample.java" target="_blank" rel="noopener">example</a> |
| that is available on GitHub and in every Apache Ignite distribution.</p> |
| </div> |
| </div> |
| </div> |
| <div class="copyright"> |
| © 2022 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. |
| |
| </div> |
| |
| </article> |
| <nav class="right-nav" data-swiftype-index='false'> |
| <div class="toc-wrapper"> |
| <ul class="sectlevel1"> |
| <li><a href="#overview">Overview</a></li> |
| <li><a href="#l2-cache-configuration">L2 Cache Configuration</a> |
| <ul class="sectlevel2"> |
| <li><a href="#maven-configuration">Maven Configuration</a></li> |
| <li><a href="#hibernate-configuration-example">Hibernate Configuration Example</a></li> |
| <li><a href="#ignite-configuration-example">Ignite Configuration Example</a></li> |
| </ul> |
| </li> |
| <li><a href="#query-cache">Query Cache</a></li> |
| <li><a href="#query-cache-configuration">Query Cache Configuration</a> |
| <ul class="sectlevel2"> |
| <li><a href="#hibernate-configuration">Hibernate Configuration</a></li> |
| <li><a href="#ignite-configuration">Ignite Configuration</a></li> |
| </ul> |
| </li> |
| <li><a href="#example">Example</a></li> |
| </ul> |
| </div> |
| |
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