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<a href="/docs/latest/persistence/persistence-tuning"
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<a href="/docs/latest/data-rebalancing" class='' >Data Rebalancing</a>
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<li><a href="/docs/latest/machine-learning/binary-classification/ann" class=''>ANN (Approximate Nearest Neighbor)</a></li>
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<a href="/docs/latest/machine-learning/preprocessing"
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<a href="/docs/latest/machine-learning/multiclass-classification"
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<li><a href="/docs/latest/machine-learning/ensemble-methods/baggin" class=''>Bagging</a></li>
<li><a href="/docs/latest/machine-learning/ensemble-methods/random-forest" class=''>Random Forest</a></li>
<li><a href="/docs/latest/machine-learning/ensemble-methods/gradient-boosting" class=''>Gradient Boosting</a></li>
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<a href="/docs/latest/machine-learning/recommendation-systems"
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</li>
<li>
<a href="/docs/latest/key-value-api/continuous-queries" class='' >Using Continuous Queries</a>
</li>
<li>
<a href="/docs/latest/services/services" class='' >Using Ignite Services</a>
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<li>
<a href="/docs/latest/messaging" class='' >Using Ignite Messaging</a>
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<a href="/docs/latest/data-structures/atomic-types"
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<a href="/docs/latest/data-structures/countdownlatch"
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<a href="/docs/latest/data-structures/atomic-sequence"
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<a href="/docs/latest/data-structures/semaphore"
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<article data-swiftype-index='true'>
<a class='edit-link' href="https://github.com/apache/ignite/tree/IGNITE-7595/docs/_docs/configuring-caches/near-cache.adoc" target="_blank">Edit</a>
<h1>Near Caches</h1>
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>A near cache is a local cache that stores the most recently or most frequently accessed data on the local node. Let&#8217;s say your application launches a client node and regularly queries reference data, such as country codes. Because client nodes do not store data, these queries always fetch data from the remote nodes. You can configure a near cache to keep the country codes on the local node while your application is running.</p>
</div>
<div class="paragraph">
<p>A near cache is configured for a specific regular cache and holds data for that cache only.</p>
</div>
<div class="paragraph">
<p>Near caches store data in the on-heap memory. You can configure the maximum size of the cache and eviction policy for near cache entries.</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
<div class="paragraph">
<p>Near caches are fully transactional and get updated or invalidated automatically whenever the data changes on the server nodes.</p>
</div>
</td>
</tr>
</table>
</div>
</div>
</div>
<div class="sect1">
<h2 id="configuring-near-cache">Configuring Near Cache</h2>
<div class="sectionbody">
<div class="paragraph">
<p>You can configure a near cache for a particular cache in the 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">&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">"myCache"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"nearConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.NearCacheConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"nearEvictionPolicyFactory"</span><span class="nt">&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.cache.eviction.lru.LruEvictionPolicyFactory"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"maxSize"</span> <span class="na">value=</span><span class="s">"100000"</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;/property&gt;</span>
<span class="nt">&lt;/bean&gt;</span></code></pre>
</div>
</div></code-tab><code-tab data-tab='Java'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="java"><span class="c1">// Create a near-cache configuration for "myCache".</span>
<span class="nc">NearCacheConfiguration</span><span class="o">&lt;</span><span class="nc">Integer</span><span class="o">,</span> <span class="nc">Integer</span><span class="o">&gt;</span> <span class="n">nearCfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">NearCacheConfiguration</span><span class="o">&lt;&gt;();</span>
<span class="c1">// Use LRU eviction policy to automatically evict entries</span>
<span class="c1">// from near-cache whenever it reaches 100_000 entries</span>
<span class="n">nearCfg</span><span class="o">.</span><span class="na">setNearEvictionPolicyFactory</span><span class="o">(</span><span class="k">new</span> <span class="nc">LruEvictionPolicyFactory</span><span class="o">&lt;&gt;(</span><span class="mi">100_000</span><span class="o">));</span>
<span class="nc">CacheConfiguration</span><span class="o">&lt;</span><span class="nc">Integer</span><span class="o">,</span> <span class="nc">Integer</span><span class="o">&gt;</span> <span class="n">cacheCfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">CacheConfiguration</span><span class="o">&lt;</span><span class="nc">Integer</span><span class="o">,</span> <span class="nc">Integer</span><span class="o">&gt;(</span><span class="s">"myCache"</span><span class="o">);</span>
<span class="n">cacheCfg</span><span class="o">.</span><span class="na">setNearConfiguration</span><span class="o">(</span><span class="n">nearCfg</span><span class="o">);</span>
<span class="c1">// Create a distributed cache on server nodes</span>
<span class="nc">IgniteCache</span><span class="o">&lt;</span><span class="nc">Integer</span><span class="o">,</span> <span class="nc">Integer</span><span class="o">&gt;</span> <span class="n">cache</span> <span class="o">=</span> <span class="n">ignite</span><span class="o">.</span><span class="na">getOrCreateCache</span><span class="o">(</span><span class="n">cacheCfg</span><span class="o">);</span></code></pre>
</div>
</div></code-tab><code-tab data-tab='C#/.NET'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="csharp"><span class="kt">var</span> <span class="n">cacheCfg</span> <span class="p">=</span> <span class="k">new</span> <span class="n">CacheConfiguration</span>
<span class="p">{</span>
<span class="n">Name</span> <span class="p">=</span> <span class="s">"myCache"</span><span class="p">,</span>
<span class="n">NearConfiguration</span> <span class="p">=</span> <span class="k">new</span> <span class="n">NearCacheConfiguration</span>
<span class="p">{</span>
<span class="n">EvictionPolicy</span> <span class="p">=</span> <span class="k">new</span> <span class="n">LruEvictionPolicy</span>
<span class="p">{</span>
<span class="n">MaxSize</span> <span class="p">=</span> <span class="m">100</span><span class="n">_000</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="p">};</span>
<span class="kt">var</span> <span class="n">cache</span> <span class="p">=</span> <span class="n">ignite</span><span class="p">.</span><span class="n">GetOrCreateCache</span><span class="p">&lt;</span><span class="kt">int</span><span class="p">,</span> <span class="kt">int</span><span class="p">&gt;(</span><span class="n">cacheCfg</span><span class="p">);</span></code></pre>
</div>
</div></code-tab><code-tab data-tab='C++' data-unavailable='true'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code>This API is not presently available for C++. You can use XML configuration.</code></pre>
</div>
</div></code-tab></code-tabs>
<div class="paragraph">
<p>Once configured in this way, the near cache is created on any node that requests data from the underlying cache, including both server nodes and client nodes. Near caches are created on server nodes and thick client nodes, but not on thin clients.</p>
</div>
<div class="paragraph">
<p>When you get an instance of the cache, as shown in the following example, the data requests go through the near cache.</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">IgniteCache</span><span class="o">&lt;</span><span class="nc">Integer</span><span class="o">,</span> <span class="nc">Integer</span><span class="o">&gt;</span> <span class="n">cache</span> <span class="o">=</span> <span class="n">ignite</span><span class="o">.</span><span class="na">cache</span><span class="o">(</span><span class="s">"myCache"</span><span class="o">);</span>
<span class="kt">int</span> <span class="n">value</span> <span class="o">=</span> <span class="n">cache</span><span class="o">.</span><span class="na">get</span><span class="o">(</span><span class="mi">1</span><span class="o">);</span></code></pre>
</div>
</div></code-tab></code-tabs>
<div class="paragraph">
<p>Most configuration parameters available in the cache configuration that make sense for the near cache are inherited from the underlying cache configuration.
For example, if the underlying cache has an <a href="/docs/latest/configuring-caches/expiry-policies">expiry policy</a> configured, entries in the near cache are expired based on the same policy.</p>
</div>
<div class="paragraph">
<p>The parameters listed in the table below are not inherited from the underlying cache configuration.</p>
</div>
<table class="tableblock frame-all grid-all stripes-even stretch">
<colgroup>
<col style="width: 20%;">
<col style="width: 60%;">
<col style="width: 20%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">Parameter</th>
<th class="tableblock halign-left valign-top">Description</th>
<th class="tableblock halign-left valign-top">Default Value</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">nearEvictionPolicy</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">The eviction policy for the near cache. See the <a href="/docs/latest/memory-configuration/eviction-policies">Eviction policies</a> page for details.</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">none</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">nearStartSize</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">The initial capacity of the near cache (the number of entries it can hold).</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">375,000</p></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect1">
<h2 id="creating-near-cache-dynamically-on-client-nodes">Creating Near Cache Dynamically On Client Nodes</h2>
<div class="sectionbody">
<div class="paragraph">
<p>When making request from a client node to a cache that hasn&#8217;t been configured to use a near cache, you can create a near cache for that cache dynamically.
This increases performance by storing "hot" data locally on the client side.
This cache is operable only on the node where it was created.</p>
</div>
<div class="paragraph">
<p>To do this, create a near cache configuration and pass it as an argument to the method that gets the instance of the cache.</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="c1">// Create a near-cache configuration</span>
<span class="nc">NearCacheConfiguration</span><span class="o">&lt;</span><span class="nc">Integer</span><span class="o">,</span> <span class="nc">String</span><span class="o">&gt;</span> <span class="n">nearCfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">NearCacheConfiguration</span><span class="o">&lt;&gt;();</span>
<span class="c1">// Use LRU eviction policy to automatically evict entries</span>
<span class="c1">// from near-cache, whenever it reaches 100_000 in size.</span>
<span class="n">nearCfg</span><span class="o">.</span><span class="na">setNearEvictionPolicyFactory</span><span class="o">(</span><span class="k">new</span> <span class="nc">LruEvictionPolicyFactory</span><span class="o">&lt;&gt;(</span><span class="mi">100_000</span><span class="o">));</span>
<span class="c1">// get the cache named "myCache" and create a near cache for it</span>
<span class="nc">IgniteCache</span><span class="o">&lt;</span><span class="nc">Integer</span><span class="o">,</span> <span class="nc">String</span><span class="o">&gt;</span> <span class="n">cache</span> <span class="o">=</span> <span class="n">ignite</span><span class="o">.</span><span class="na">getOrCreateNearCache</span><span class="o">(</span><span class="s">"myCache"</span><span class="o">,</span> <span class="n">nearCfg</span><span class="o">);</span>
<span class="nc">String</span> <span class="n">value</span> <span class="o">=</span> <span class="n">cache</span><span class="o">.</span><span class="na">get</span><span class="o">(</span><span class="mi">1</span><span class="o">);</span></code></pre>
</div>
</div></code-tab><code-tab data-tab='C#/.NET'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="csharp"><span class="kt">var</span> <span class="n">ignite</span> <span class="p">=</span> <span class="n">Ignition</span><span class="p">.</span><span class="nf">Start</span><span class="p">(</span><span class="k">new</span> <span class="n">IgniteConfiguration</span>
<span class="p">{</span>
<span class="n">DiscoverySpi</span> <span class="p">=</span> <span class="k">new</span> <span class="n">TcpDiscoverySpi</span>
<span class="p">{</span>
<span class="n">LocalPort</span> <span class="p">=</span> <span class="m">48500</span><span class="p">,</span>
<span class="n">LocalPortRange</span> <span class="p">=</span> <span class="m">20</span><span class="p">,</span>
<span class="n">IpFinder</span> <span class="p">=</span> <span class="k">new</span> <span class="n">TcpDiscoveryStaticIpFinder</span>
<span class="p">{</span>
<span class="n">Endpoints</span> <span class="p">=</span> <span class="k">new</span><span class="p">[]</span>
<span class="p">{</span>
<span class="s">"127.0.0.1:48500..48520"</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="p">},</span>
<span class="n">CacheConfiguration</span> <span class="p">=</span> <span class="k">new</span><span class="p">[]</span>
<span class="p">{</span>
<span class="k">new</span> <span class="n">CacheConfiguration</span> <span class="p">{</span><span class="n">Name</span> <span class="p">=</span> <span class="s">"myCache"</span><span class="p">}</span>
<span class="p">}</span>
<span class="p">});</span>
<span class="kt">var</span> <span class="n">client</span> <span class="p">=</span> <span class="n">Ignition</span><span class="p">.</span><span class="nf">Start</span><span class="p">(</span><span class="k">new</span> <span class="n">IgniteConfiguration</span>
<span class="p">{</span>
<span class="n">IgniteInstanceName</span> <span class="p">=</span> <span class="s">"clientNode"</span><span class="p">,</span>
<span class="n">ClientMode</span> <span class="p">=</span> <span class="k">true</span><span class="p">,</span>
<span class="n">DiscoverySpi</span> <span class="p">=</span> <span class="k">new</span> <span class="n">TcpDiscoverySpi</span>
<span class="p">{</span>
<span class="n">LocalPort</span> <span class="p">=</span> <span class="m">48500</span><span class="p">,</span>
<span class="n">LocalPortRange</span> <span class="p">=</span> <span class="m">20</span><span class="p">,</span>
<span class="n">IpFinder</span> <span class="p">=</span> <span class="k">new</span> <span class="n">TcpDiscoveryStaticIpFinder</span>
<span class="p">{</span>
<span class="n">Endpoints</span> <span class="p">=</span> <span class="k">new</span><span class="p">[]</span>
<span class="p">{</span>
<span class="s">"127.0.0.1:48500..48520"</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="p">});</span>
<span class="c1">// Create a near-cache configuration</span>
<span class="kt">var</span> <span class="n">nearCfg</span> <span class="p">=</span> <span class="k">new</span> <span class="n">NearCacheConfiguration</span>
<span class="p">{</span>
<span class="c1">// Use LRU eviction policy to automatically evict entries</span>
<span class="c1">// from near-cache, whenever it reaches 100_000 in size.</span>
<span class="n">EvictionPolicy</span> <span class="p">=</span> <span class="k">new</span> <span class="nf">LruEvictionPolicy</span><span class="p">()</span>
<span class="p">{</span>
<span class="n">MaxSize</span> <span class="p">=</span> <span class="m">100</span><span class="n">_000</span>
<span class="p">}</span>
<span class="p">};</span>
<span class="c1">// get the cache named "myCache" and create a near cache for it</span>
<span class="kt">var</span> <span class="n">cache</span> <span class="p">=</span> <span class="n">client</span><span class="p">.</span><span class="n">GetOrCreateNearCache</span><span class="p">&lt;</span><span class="kt">int</span><span class="p">,</span> <span class="kt">string</span><span class="p">&gt;(</span><span class="s">"myCache"</span><span class="p">,</span> <span class="n">nearCfg</span><span class="p">);</span></code></pre>
</div>
</div></code-tab><code-tab data-tab='C++' data-unavailable='true'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code>This API is not presently available for C++.</code></pre>
</div>
</div></code-tab></code-tabs>
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<li><a href="#configuring-near-cache">Configuring Near Cache</a></li>
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