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| <a href="/docs/latest/distributed-computing/executor-service" |
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| class='' |
| >Executor Service</a> |
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| <li> |
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| <a href="/docs/latest/distributed-computing/map-reduce" |
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| class='' |
| >MapReduce API</a> |
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| </li> |
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| <li> |
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| <a href="/docs/latest/distributed-computing/load-balancing" |
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| class='' |
| >Load Balancing</a> |
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| <li> |
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| <a href="/docs/latest/distributed-computing/fault-tolerance" |
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| class='' |
| >Fault Tolerance</a> |
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| <li> |
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| <a href="/docs/latest/distributed-computing/job-scheduling" |
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| class='' |
| >Job Scheduling</a> |
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| <a href="/docs/latest/collocated-computations" class='' >Colocating Computations with Data</a> |
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| <a href="/docs/latest/events/listening-to-events" |
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| class='' |
| >Enabling and Listenting to Events</a> |
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| <li> |
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| <a href="/docs/latest/events/events" |
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| <a href="/docs/latest/platform-cache" class='' >.NET Platform Cache</a> |
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| >Queue and Set</a> |
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| <li> |
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| class='' |
| >CountDownLatch</a> |
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| <a href="/docs/latest/data-structures/atomic-sequence" |
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| <li><a href="/docs/latest//machine-learning/regression/knn-regression" class=''>k-NN Regression</a></li> |
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| <li><a href="/docs/latest//machine-learning/clustering/introduction" class=''>Introduction</a></li> |
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| <li><a href="/docs/latest//machine-learning/clustering/k-means-clustering" class=''>K-Means Clustering</a></li> |
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| <li><a href="/docs/latest//machine-learning/clustering/gaussian-mixture" class=''>Gaussian mixture (GMM)</a></li> |
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| <li> |
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| <a href="/docs/latest/machine-learning/preprocessing" |
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| >Preprocessing</a> |
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| <li> |
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| <li><a href="/docs/latest//machine-learning/model-selection/introduction" class=''>Introduction</a></li> |
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| <li><a href="/docs/latest//machine-learning/model-selection/evaluator" class=''>Evaluator</a></li> |
| |
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| <li><a href="/docs/latest//machine-learning/model-selection/split-the-dataset-on-test-and-train-datasets" class=''>Split the dataset on test and train datasets</a></li> |
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| <li><a href="/docs/latest//machine-learning/model-selection/hyper-parameter-tuning" class=''>Hyper-parameter tuning</a></li> |
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| <li><a href="/docs/latest//machine-learning/model-selection/pipeline-api" class=''>Pipeline API</a></li> |
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| <li> |
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| <a href="/docs/latest/machine-learning/multiclass-classification" |
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| class='' |
| >Multiclass Classification</a> |
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| <li> |
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| <li><a href="/docs/latest//machine-learning/ensemble-methods/introduction" class=''></a></li> |
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| <li><a href="/docs/latest//machine-learning/ensemble-methods/baggin" class=''>Bagging</a></li> |
| |
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| <li><a href="/docs/latest//machine-learning/ensemble-methods/random-forest" class=''>Random Forest</a></li> |
| |
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| <li><a href="/docs/latest//machine-learning/ensemble-methods/gradient-boosting" class=''>Gradient Boosting</a></li> |
| |
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| <li> |
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| <a href="/docs/latest/machine-learning/recommendation-systems" |
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| class='' |
| >Recommendation Systems</a> |
| |
| </li> |
| |
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| <li> |
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| <button |
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| <li><a href="/docs/latest//machine-learning/importing-model/introduction" class=''>Introduction</a></li> |
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| <li><a href="/docs/latest//machine-learning/importing-model/model-import-from-gxboost" class=''>Import Model from XGBoost</a></li> |
| |
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| <li><a href="/docs/latest//machine-learning/importing-model/model-import-from-apache-spark" class=''>Import Model from Apache Spark</a></li> |
| |
| </nav> |
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| </nav> |
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| <a href="/docs/latest/monitoring-metrics/intro" |
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| >Introduction</a> |
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| <li> |
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| <a href="/docs/latest/monitoring-metrics/cluster-id" |
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| <li><a href="/docs/latest//monitoring-metrics/configuring-metrics" class=''>Configuring Metrics</a></li> |
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| <li><a href="/docs/latest//monitoring-metrics/metrics" class=''>JMX Metrics</a></li> |
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| <li><a href="/docs/latest//security/tde" class=''>Introduction</a></li> |
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| >Java Thin Client</a> |
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| <a href="/docs/latest/thin-clients/dotnet-thin-client" |
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| >.NET Thin Client</a> |
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| <a href="/docs/latest/thin-clients/cpp-thin-client" |
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| >C++ Thin Client</a> |
| |
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| <li> |
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| <a href="/docs/latest/thin-clients/python-thin-client" |
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| class='' |
| >Python Thin Client</a> |
| |
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| <li> |
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| <a href="/docs/latest/thin-clients/php-thin-client" |
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| >PHP Thin Client</a> |
| |
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| <li> |
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| <a href="/docs/latest/thin-clients/nodejs-thin-client" |
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| class='' |
| >Node.js Thin Client</a> |
| |
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| |
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| <li><a href="/docs/latest//binary-client-protocol/binary-client-protocol" class=''>Binary Client Protocol</a></li> |
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| <li><a href="/docs/latest//binary-client-protocol/data-format" class=''>Data Format</a></li> |
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| <li><a href="/docs/latest//binary-client-protocol/key-value-queries" class=''>Key-Value Queries</a></li> |
| |
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| <li><a href="/docs/latest//binary-client-protocol/sql-and-scan-queries" class=''>SQL and Scan Queries</a></li> |
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| <li><a href="/docs/latest//binary-client-protocol/binary-type-metadata" class=''>Binary Types Metadata</a></li> |
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| <li><a href="/docs/latest//binary-client-protocol/cache-configuration" class=''>Cache Configuration</a></li> |
| |
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| <li> |
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| <a href="/docs/latest/SQL/ODBC/odbc-driver" |
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| class='' |
| >ODBC Driver</a> |
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| |
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| <li> |
| |
| <a href="/docs/latest/SQL/ODBC/connection-string-dsn" |
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| class='' |
| >Connection String and DSN</a> |
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| </li> |
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| |
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| <li> |
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| <a href="/docs/latest/SQL/ODBC/querying-modifying-data" |
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| class='' |
| >Querying and Modifying Data</a> |
| |
| </li> |
| |
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| <li> |
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| <a href="/docs/latest/SQL/ODBC/specification" |
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| class='' |
| >Specification</a> |
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| </li> |
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| |
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| <li> |
| |
| <a href="/docs/latest/SQL/ODBC/data-types" |
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| class='' |
| >Data Types</a> |
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| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/SQL/ODBC/error-codes" |
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| class='' |
| >Error Codes</a> |
| |
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| |
| </nav> |
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| <li> |
| |
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| <a href="/docs/latest/restapi" class='' >REST API</a> |
| |
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| <a href="/docs/latest/control-script" class='' >Control Script</a> |
| |
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| <a href="/docs/latest/plugins" class='' >Plugins</a> |
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| |
| <a href="/docs/latest/sqlline" class='' >SQLLine</a> |
| |
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| <button type='button' data-guide-url="" class='group-toggle collapsed '>Ignite for Spark<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
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| <li> |
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| <a href="/docs/latest/ignite-for-spark/overview" |
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| class='' |
| >Overview</a> |
| |
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| |
| <li> |
| |
| <a href="/docs/latest/ignite-for-spark/ignitecontext-and-rdd" |
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| class='' |
| >IgniteContext and IgniteRDD</a> |
| |
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| <article data-swiftype-index='true'> |
| <a class='edit-link' href="https://github.com/apache/ignite/tree/IGNITE-7595/docs/_docs/persistence/swap.adoc" target="_blank">Edit</a> |
| |
| <h1>Swapping</h1> |
| |
| <div class="sect1"> |
| <h2 id="overview">Overview</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>When using a pure in-memory storage, it is possible that the size of data loaded into a node exceeds the physical RAM size, leading to out of memory errors (OOMEs). |
| If you do not want to use the native persistence or an external storage, you can enable swapping, in which case the in-memory data is moved to the swap space located on disk. |
| Please note that Ignite does not provide its own implementation of swap space. |
| Instead, it takes advantage of the swapping functionality provided by the operating system (OS).</p> |
| </div> |
| <div class="paragraph"> |
| <p>When swap space is enabled, Ignite stores data in memory-mapped files (MMF) whose content is swapped to disk by the OS according to the current RAM consumption; |
| however, in that scenario the data access time is longer. |
| Moreover, there are no data durability guarantees. |
| Which means that the data from the swap space is available only as long as the node is alive. |
| Once the node where the swap space exists shuts down, the data is lost. |
| Therefore, you should use swap space as an extension to RAM only to give yourself enough time to add more nodes to the cluster in order to re-distribute data and avoid OOMEs which might happen if the cluster is not scaled in time.</p> |
| </div> |
| <div class="admonitionblock caution"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <div class="title">Caution</div> |
| </td> |
| <td class="content"> |
| <div class="paragraph"> |
| <p>Since swap space is located on disk, it should not be considered as a replacement for native persistence. |
| Data from the swap space is available as long as the node is active. Once the node shuts down, the data is lost. |
| To ensure that data is always available, you should either enable <a href="/docs/latest/persistence/native-persistence/">native persistence</a> or use an <a href="/docs/latest/persistence/external-storage">external storage</a>.</p> |
| </div> |
| </td> |
| </tr> |
| </table> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="enabling-swapping">Enabling Swapping</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Data Region <code>maxSize</code> defines the total <code>maxSize</code> of the region. |
| You will get out of memory errors if your data size exceeds <code>maxSize</code> and neither native persistence nor an external database is used. |
| To avoid this situation with the swapping capabilities, you need to:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Set <code>maxSize</code> to a value that is bigger than the total RAM size. In this case, the OS takes care of the swapping.</p> |
| </li> |
| <li> |
| <p>Enable swapping in the data region configuration, as shown below.</p> |
| </li> |
| </ul> |
| </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"><!-- Durable 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 500 MB of RAM |
| with swap enabled. |
| --></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">"500MB_Region"</span><span class="nt">/></span> |
| <span class="c"><!-- 100 MB initial size. --></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"initialSize"</span> <span class="na">value=</span><span class="s">"#{100L * 1024 * 1024}"</span><span class="nt">/></span> |
| <span class="c"><!-- Setting region max size equal to physical RAM size(5 GB). --></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"maxSize"</span> <span class="na">value=</span><span class="s">"#{5L * 1024 * 1024 * 1024}"</span><span class="nt">/></span> |
| <span class="c"><!-- Enabling swap space for the region. --></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"swapPath"</span> <span class="na">value=</span><span class="s">"/path/to/some/directory"</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"><!-- Other configurations. --></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">// Durable 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">"500MB_Region"</span><span class="o">);</span> |
| |
| <span class="c1">// Setting initial RAM size.</span> |
| <span class="n">regionCfg</span><span class="o">.</span><span class="na">setInitialSize</span><span class="o">(</span><span class="mi">100L</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">// Setting region max size equal to physical RAM size(5 GB)</span> |
| <span class="n">regionCfg</span><span class="o">.</span><span class="na">setMaxSize</span><span class="o">(</span><span class="mi">5L</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">// Enable swap space.</span> |
| <span class="n">regionCfg</span><span class="o">.</span><span class="na">setSwapPath</span><span class="o">(</span><span class="s">"/path/to/some/directory"</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">"5GB_Region"</span><span class="p">,</span> |
| <span class="n">InitialSize</span> <span class="p">=</span> <span class="m">100L</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">5L</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">SwapPath</span> <span class="p">=</span> <span class="s">"/path/to/some/directory"</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> |
| </div> |
| <div class="copyright"> |
| © 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. |
| |
| </div> |
| |
| </article> |
| <nav class="right-nav" data-swiftype-index='false'> |
| <ul class="sectlevel1"> |
| <li><a href="#overview">Overview</a></li> |
| <li><a href="#enabling-swapping">Enabling Swapping</a></li> |
| </ul> |
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