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| <a href="/docs/2.11.1/services/services" class='' >Using Ignite Services</a> |
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| <a href="/docs/2.11.1/messaging" class='' >Using Ignite Messaging</a> |
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| |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/2.11.1/perf-and-troubleshooting/yardstick-benchmarking" |
| class='' |
| >Benchmarking With Yardstick</a> |
| |
| </li> |
| |
| |
| |
| </nav> |
| |
| </li> |
| |
| </nav> |
| <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/memory-configuration/eviction-policies.adoc" target="_blank">Edit</a> |
| |
| <h1>Eviction Policies</h1> |
| |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>When <a href="/docs/2.11.1/persistence/native-persistence">Native Persistence</a> is off, Ignite holds all cache entries in the off-heap memory and allocates pages as new data comes in. |
| When a memory limit is reached and Ignite cannot allocate a page, some of the data must be purged from memory to avoid OutOfMemory errors. |
| This process is called <em>eviction</em>. Eviction prevents the system from running out of memory but at the cost of losing data and having to reload it when you need it again.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Eviction is used in following cases:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>for off-heap memory when <a href="/docs/2.11.1/persistence/native-persistence">Native Persistence</a> is off;</p> |
| </li> |
| <li> |
| <p>for off-heap memory when Ignite is used with an <a href="/docs/2.11.1/persistence/external-storage">external storage</a>;</p> |
| </li> |
| <li> |
| <p>for <a href="/docs/2.11.1/configuring-caches/on-heap-caching">on-heap caches</a>;</p> |
| </li> |
| <li> |
| <p>for <a href="/docs/2.11.1/configuring-caches/near-cache">near caches</a> if configured.</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>When Native Persistence is on, a similar process — called <em>page replacement</em> — is used to free up off-heap memory when Ignite cannot allocate a new page. |
| The difference is that the data is not lost (because it is stored in the persistent storage), and therefore you are less concerned about losing data than about efficiency. |
| Refer to the <a href="/docs/2.11.1/memory-configuration/replacement-policies">Replacement Policies</a> page for information about page replacement configuration.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="off-heap-memory-eviction">Off-Heap Memory Eviction</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Off-heap memory eviction is implemented as follows.</p> |
| </div> |
| <div class="paragraph"> |
| <p>When memory usage exceeds the preset limit, Ignite applies one of the preconfigured algorithms to select a memory page that is most suitable for eviction. |
| Then, each cache entry contained in the page is removed from the page. |
| However, if an entry is locked by a transaction, it is retained. |
| Thus, either the entire page or a large chunk of it is emptied and is ready to be reused.</p> |
| </div> |
| <div class="imageblock"> |
| <div class="content"> |
| <img src="/docs/2.11.1/images/off_heap_memory_eviction.png" alt="Off-Heap Memory Eviction Mechanism"> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>By default, off-heap memory eviction is disabled, which means that the used memory constantly grows until it reaches its limit. |
| To enable eviction, specify the page eviction mode in the <a href="/docs/2.11.1/memory-configuration/data-regions/">data region configuration</a>. |
| Note that off-heap memory eviction is configured per <a href="/docs/2.11.1/memory-configuration/data-regions">data region</a>. |
| If you don’t use data regions, you have to explicitly add default data region parameters in your configuration to be able to configure eviction.</p> |
| </div> |
| <div class="paragraph"> |
| <p>By default, eviction starts when the overall RAM consumption by a region gets to 90%. |
| Use the <code>DataRegionConfiguration.setEvictionThreshold(…​)</code> parameter if you need to initiate eviction earlier or later.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Ignite supports two page selection algorithms:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Random-LRU</p> |
| </li> |
| <li> |
| <p>Random-2-LRU</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>The differences between the two are explained below.</p> |
| </div> |
| <div class="sect2"> |
| <h3 id="random-lru">Random-LRU</h3> |
| <div class="paragraph"> |
| <p>To enable the Random-LRU eviction algorithm, configure the data region as shown 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"><bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.IgniteConfiguration"</span><span class="nt">></span> |
| <span class="c"><!-- Memory configuration. --></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"dataStorageConfiguration"</span><span class="nt">></span> |
| <span class="nt"><bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.DataStorageConfiguration"</span><span class="nt">></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"dataRegionConfigurations"</span><span class="nt">></span> |
| <span class="nt"><list></span> |
| <span class="c"><!-- Defining a data region that will consume up to 20 GB of RAM. --></span> |
| <span class="nt"><bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.DataRegionConfiguration"</span><span class="nt">></span> |
| <span class="c"><!-- Custom region name. --></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"name"</span> <span class="na">value=</span><span class="s">"20GB_Region"</span><span class="nt">/></span> |
| <span class="c"><!-- 500 MB initial size (RAM). --></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"initialSize"</span> <span class="na">value=</span><span class="s">"#{500L * 1024 * 1024}"</span><span class="nt">/></span> |
| <span class="c"><!-- 20 GB maximum size (RAM). --></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"maxSize"</span> <span class="na">value=</span><span class="s">"#{20L * 1024 * 1024 * 1024}"</span><span class="nt">/></span> |
| <span class="c"><!-- Enabling RANDOM_LRU eviction for this region. --></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"pageEvictionMode"</span> <span class="na">value=</span><span class="s">"RANDOM_LRU"</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> |
| <span class="nt"></property></span> |
| <span class="nt"></bean></span> |
| |
| <span class="nt"><bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.IgniteConfiguration"</span><span class="nt">></span> |
| <span class="c"><!-- Memory configuration. --></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"dataStorageConfiguration"</span><span class="nt">></span> |
| <span class="nt"><bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.DataStorageConfiguration"</span><span class="nt">></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"dataRegionConfigurations"</span><span class="nt">></span> |
| <span class="nt"><list></span> |
| <span class="c"><!-- |
| Defining a data region that consumes up to 20 GB of RAM. |
| --></span> |
| <span class="nt"><bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.DataRegionConfiguration"</span><span class="nt">></span> |
| <span class="c"><!-- Custom region name. --></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"name"</span> <span class="na">value=</span><span class="s">"20GB_Region"</span><span class="nt">/></span> |
| |
| <span class="c"><!-- 500 MB initial size (RAM). --></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"initialSize"</span> <span class="na">value=</span><span class="s">"#{500L * 1024 * 1024}"</span><span class="nt">/></span> |
| |
| <span class="c"><!-- 20 GB maximum size (RAM). --></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"maxSize"</span> <span class="na">value=</span><span class="s">"#{20L * 1024 * 1024 * 1024}"</span><span class="nt">/></span> |
| |
| <span class="c"><!-- Enabling RANDOM_LRU eviction for this region. --></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"pageEvictionMode"</span> <span class="na">value=</span><span class="s">"RANDOM_LRU"</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> |
| <span class="nt"></property></span> |
| |
| <span class="c"><!-- The rest of the configuration. --></span> |
| <span class="nt"></bean></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">// Node configuration.</span> |
| <span class="nc">IgniteConfiguration</span> <span class="n">cfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">IgniteConfiguration</span><span class="o">();</span> |
| |
| <span class="c1">// Memory configuration.</span> |
| <span class="nc">DataStorageConfiguration</span> <span class="n">storageCfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">DataStorageConfiguration</span><span class="o">();</span> |
| |
| <span class="c1">// Creating a new data region.</span> |
| <span class="nc">DataRegionConfiguration</span> <span class="n">regionCfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">DataRegionConfiguration</span><span class="o">();</span> |
| |
| <span class="c1">// Region name.</span> |
| <span class="n">regionCfg</span><span class="o">.</span><span class="na">setName</span><span class="o">(</span><span class="s">"20GB_Region"</span><span class="o">);</span> |
| |
| <span class="c1">// 500 MB initial size (RAM).</span> |
| <span class="n">regionCfg</span><span class="o">.</span><span class="na">setInitialSize</span><span class="o">(</span><span class="mi">500L</span> <span class="o">*</span> <span class="mi">1024</span> <span class="o">*</span> <span class="mi">1024</span><span class="o">);</span> |
| |
| <span class="c1">// 20 GB max size (RAM).</span> |
| <span class="n">regionCfg</span><span class="o">.</span><span class="na">setMaxSize</span><span class="o">(</span><span class="mi">20L</span> <span class="o">*</span> <span class="mi">1024</span> <span class="o">*</span> <span class="mi">1024</span> <span class="o">*</span> <span class="mi">1024</span><span class="o">);</span> |
| |
| <span class="c1">// Enabling RANDOM_LRU eviction for this region.</span> |
| <span class="n">regionCfg</span><span class="o">.</span><span class="na">setPageEvictionMode</span><span class="o">(</span><span class="nc">DataPageEvictionMode</span><span class="o">.</span><span class="na">RANDOM_LRU</span><span class="o">);</span> |
| |
| <span class="c1">// Setting the data region configuration.</span> |
| <span class="n">storageCfg</span><span class="o">.</span><span class="na">setDataRegionConfigurations</span><span class="o">(</span><span class="n">regionCfg</span><span class="o">);</span> |
| |
| <span class="c1">// Applying the new configuration.</span> |
| <span class="n">cfg</span><span class="o">.</span><span class="na">setDataStorageConfiguration</span><span class="o">(</span><span class="n">storageCfg</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">cfg</span> <span class="p">=</span> <span class="k">new</span> <span class="n">IgniteConfiguration</span> |
| <span class="p">{</span> |
| <span class="n">DataStorageConfiguration</span> <span class="p">=</span> <span class="k">new</span> <span class="n">DataStorageConfiguration</span> |
| <span class="p">{</span> |
| <span class="n">DataRegionConfigurations</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">DataRegionConfiguration</span> |
| <span class="p">{</span> |
| <span class="n">Name</span> <span class="p">=</span> <span class="s">"20GB_Region"</span><span class="p">,</span> |
| <span class="n">InitialSize</span> <span class="p">=</span> <span class="m">500L</span> <span class="p">*</span> <span class="m">1024</span> <span class="p">*</span> <span class="m">1024</span><span class="p">,</span> |
| <span class="n">MaxSize</span> <span class="p">=</span> <span class="m">20L</span> <span class="p">*</span> <span class="m">1024</span> <span class="p">*</span> <span class="m">1024</span> <span class="p">*</span> <span class="m">1024</span><span class="p">,</span> |
| <span class="n">PageEvictionMode</span> <span class="p">=</span> <span class="n">DataPageEvictionMode</span><span class="p">.</span><span class="n">RandomLru</span> |
| <span class="p">}</span> |
| <span class="p">}</span> |
| <span class="p">}</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>Random-LRU algorithm works as follows:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Once a memory region defined by a memory policy is configured, an off-heap array is allocated to track the 'last usage' timestamp for every individual data page.</p> |
| </li> |
| <li> |
| <p>When a data page is accessed, its timestamp gets updated in the tracking array.</p> |
| </li> |
| <li> |
| <p>When it is time to evict a page, the algorithm randomly chooses 5 indexes from the tracking array and evicts the page with the oldest timestamp. If some of the indexes point to non-data pages (index or system pages), then the algorithm picks another page.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="random-2-lru">Random-2-LRU</h3> |
| <div class="paragraph"> |
| <p>To enable Random-2-LRU eviction algorithm, which is a scan-resistant version of Random-LRU, configure the data region, as shown in the example 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"><bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.IgniteConfiguration"</span><span class="nt">></span> |
| <span class="c"><!-- Memory configuration. --></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"dataStorageConfiguration"</span><span class="nt">></span> |
| <span class="nt"><bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.DataStorageConfiguration"</span><span class="nt">></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"dataRegionConfigurations"</span><span class="nt">></span> |
| <span class="nt"><list></span> |
| <span class="c"><!-- |
| Defining a data region that consumes up to 20 GB of RAM. |
| --></span> |
| <span class="nt"><bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.DataRegionConfiguration"</span><span class="nt">></span> |
| <span class="c"><!-- Custom region name. --></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"name"</span> <span class="na">value=</span><span class="s">"20GB_Region"</span><span class="nt">/></span> |
| |
| <span class="c"><!-- 500 MB initial size (RAM). --></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"initialSize"</span> <span class="na">value=</span><span class="s">"#{500L * 1024 * 1024}"</span><span class="nt">/></span> |
| |
| <span class="c"><!-- 20 GB maximum size (RAM). --></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"maxSize"</span> <span class="na">value=</span><span class="s">"#{20L * 1024 * 1024 * 1024}"</span><span class="nt">/></span> |
| |
| <span class="c"><!-- Enabling RANDOM_2_LRU eviction for this region. --></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"pageEvictionMode"</span> <span class="na">value=</span><span class="s">"RANDOM_2_LRU"</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> |
| <span class="nt"></property></span> |
| |
| <span class="c"><!-- The rest of the configuration. --></span> |
| <span class="nt"></bean></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">// Ignite configuration.</span> |
| <span class="nc">IgniteConfiguration</span> <span class="n">cfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">IgniteConfiguration</span><span class="o">();</span> |
| |
| <span class="c1">// Memory configuration.</span> |
| <span class="nc">DataStorageConfiguration</span> <span class="n">storageCfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">DataStorageConfiguration</span><span class="o">();</span> |
| |
| <span class="c1">// Creating a new data region.</span> |
| <span class="nc">DataRegionConfiguration</span> <span class="n">regionCfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">DataRegionConfiguration</span><span class="o">();</span> |
| |
| <span class="c1">// Region name.</span> |
| <span class="n">regionCfg</span><span class="o">.</span><span class="na">setName</span><span class="o">(</span><span class="s">"20GB_Region"</span><span class="o">);</span> |
| |
| <span class="c1">// 500 MB initial size (RAM).</span> |
| <span class="n">regionCfg</span><span class="o">.</span><span class="na">setInitialSize</span><span class="o">(</span><span class="mi">500L</span> <span class="o">*</span> <span class="mi">1024</span> <span class="o">*</span> <span class="mi">1024</span><span class="o">);</span> |
| |
| <span class="c1">// 20 GB max size (RAM).</span> |
| <span class="n">regionCfg</span><span class="o">.</span><span class="na">setMaxSize</span><span class="o">(</span><span class="mi">20L</span> <span class="o">*</span> <span class="mi">1024</span> <span class="o">*</span> <span class="mi">1024</span> <span class="o">*</span> <span class="mi">1024</span><span class="o">);</span> |
| |
| <span class="c1">// Enabling RANDOM_2_LRU eviction for this region.</span> |
| <span class="n">regionCfg</span><span class="o">.</span><span class="na">setPageEvictionMode</span><span class="o">(</span><span class="nc">DataPageEvictionMode</span><span class="o">.</span><span class="na">RANDOM_2_LRU</span><span class="o">);</span> |
| |
| <span class="c1">// Setting the data region configuration.</span> |
| <span class="n">storageCfg</span><span class="o">.</span><span class="na">setDataRegionConfigurations</span><span class="o">(</span><span class="n">regionCfg</span><span class="o">);</span> |
| |
| <span class="c1">// Applying the new configuration.</span> |
| <span class="n">cfg</span><span class="o">.</span><span class="na">setDataStorageConfiguration</span><span class="o">(</span><span class="n">storageCfg</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">cfg</span> <span class="p">=</span> <span class="k">new</span> <span class="n">IgniteConfiguration</span> |
| <span class="p">{</span> |
| <span class="n">DataStorageConfiguration</span> <span class="p">=</span> <span class="k">new</span> <span class="n">DataStorageConfiguration</span> |
| <span class="p">{</span> |
| <span class="n">DataRegionConfigurations</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">DataRegionConfiguration</span> |
| <span class="p">{</span> |
| <span class="n">Name</span> <span class="p">=</span> <span class="s">"20GB_Region"</span><span class="p">,</span> |
| <span class="n">InitialSize</span> <span class="p">=</span> <span class="m">500L</span> <span class="p">*</span> <span class="m">1024</span> <span class="p">*</span> <span class="m">1024</span><span class="p">,</span> |
| <span class="n">MaxSize</span> <span class="p">=</span> <span class="m">20L</span> <span class="p">*</span> <span class="m">1024</span> <span class="p">*</span> <span class="m">1024</span> <span class="p">*</span> <span class="m">1024</span><span class="p">,</span> |
| <span class="n">PageEvictionMode</span> <span class="p">=</span> <span class="n">DataPageEvictionMode</span><span class="p">.</span><span class="n">Random2Lru</span> |
| <span class="p">}</span> |
| <span class="p">}</span> |
| <span class="p">}</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>In Random-2-LRU, the two most recent access timestamps are stored for every data page. At the time of eviction, the algorithm randomly chooses 5 indexes from the tracking array and the minimum between two latest timestamps is taken for further comparison with corresponding minimums of four other pages that are chosen as eviction candidates.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Random-LRU-2 outperforms LRU by resolving the "one-hit wonder" problem: if a data page is accessed rarely but accidentally accessed once, it’s protected from eviction for a long time.</p> |
| </div> |
| </div> |
| </div> |
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| <h2 id="on-heap-cache-eviction">On-Heap Cache Eviction</h2> |
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| <p>Refer to the <a href="/docs/2.11.1/configuring-caches/on-heap-caching#configuring-eviction-policy">Configuring Eviction Policy for On-Heap Caches</a> section for the instruction on how to configure eviction policy for on-heap caches.</p> |
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| <li><a href="#random-lru">Random-LRU</a></li> |
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