blob: e4d61699274d2d6fbc8ad37510015c5fb8565c16 [file] [log] [blame]
<!DOCTYPE html>
<html lang="en">
<head>
<!-- Global site tag (gtag.js) - Google Analytics -->
<script async src="https://www.googletagmanager.com/gtag/js?id=UA-61232409-1"></script>
<script>
window.dataLayer = window.dataLayer || [];
function gtag(){dataLayer.push(arguments);}
gtag('js', new Date());
gtag('config', 'UA-61232409-1');
</script>
<meta charset="UTF-8">
<meta name="ignite-version" content="2.9.0" />
<title>Memory Architecture | Ignite Documentation</title>
<link rel="canonical" href="/docs/2.9.0/memory-architecture" />
<META NAME="ROBOTS" CONTENT="NOINDEX" />
<link rel="stylesheet" href="/assets/css/styles.css?1609302781">
<link rel="stylesheet" href="/assets/css/asciidoc-pygments.css">
<link rel="shortcut icon" href="/favicon.ico">
<meta name='viewport' content='width=device-width, height=device-height, initial-scale=1.0, minimum-scale=1.0'>
<script type="text/javascript" src="/assets/js/anchor.min.js?1609302781"></script>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/docsearch.js@2/dist/cdn/docsearch.min.css" />
</head>
<body>
<header>
<!--#include virtual="/includes/promotion_banner.html" -->
<div class="container">
<button type='button' class='menu' title='Docs menu'>
<img src="/assets/images/menu-icon.svg"/>
</button>
<div class='home'>
<a href="/" class='home' title='Apache Ignite home'>
<img src="/assets/images/apache_ignite_logo.svg" alt="Apache Ignite logo" width="103" >
</a>
</div>
<select id="version-selector">
<option value="2.9.0">2.9.0</option>
</select>
<nav id="api-docs">
<li><a href="#">APIs</a>
<nav class='dropdown'>
<li class="dropdown-item"><a href="/releases/latest/javadoc/index.html">Java</a></li>
<li class="dropdown-item"><a href="/releases/latest/dotnetdoc/api/">C#/.NET</a></li>
<li class="dropdown-item"><a href="/releases/latest/cppdoc/index.html">C++</a></li>
<li class="dropdown-item"><a href="/releases/latest/scaladoc/scalar/index.html#org.apache.ignite.scalar.scalar$">Scala</a></li>
</nav>
</li>
<li><a href="#">Examples</a>
<nav class="dropdown">
<li class="dropdown-item"><a href="https://github.com/apache/ignite/tree/master/examples" target="_blank" rel="noopener" title="Apache Ignite Java examples">Java</a></li>
<li class="dropdown-item"><a href="https://github.com/apache/ignite/tree/master/modules/platforms/dotnet/examples" target="_blank" rel="noopener" title="Apache Ignite C#/.NET examples">C#/.NET</a></li>
<li class="dropdown-item"><a href="https://github.com/apache/ignite/tree/master/modules/platforms/cpp/examples" target="_blank" rel="noopener" title="Apache Ignite C++ examples">C++</a></li>
<li class="dropdown-item"><a href="https://github.com/apache/ignite/tree/master/modules/platforms/python/examples" target="_blank" rel="noopener" title="Apache Ignite Python examples">Python</a></li>
<li class="dropdown-item"><a href="https://github.com/apache/ignite/tree/master/modules/platforms/nodejs/examples" target="_blank" rel="noopener" title="Apache Ignite NodeJS examples">NodeJS</a></li>
<li class="dropdown-item"><a href="https://github.com/apache/ignite/tree/master/modules/platforms/php/examples" target="_blank" rel="noopener" title="Apache Ignite PHP examples">PHP</a></li>
</nav>
</li>
</nav>
<form class='search'>
<button class="search-close" type='button'><img src='/assets/images/cancel.svg'></button>
<input type="search" placeholder="Search…" id="search-input">
</form>
<button type='button' class='search-toggle'><img src='/assets/images/search.svg'></button>
<nav id="lang-selector">
<li><a href="#"><img src="/assets/images/icon_lang_en.png" alt="English language icon" /><span></span></a>
<nav class="dropdown">
<li class="dropdown-item"><a href="/docs/latest/" ><img src="/assets/images/icon_lang_en.png" alt="English language icon" /><span>English</span></a></li>
<li class="dropdown-item"><a href="https://www.ignite-service.cn/doc/java/" target="_blank" rel="noopener"><img src="/assets/images/icon_lang_cn.png" alt="Chinese language icon" /><span>Chinese</span></a></li>
</nav>
</li>
</nav>
<button type='button' class='top-nav-toggle'></button>
</div>
</header>
<link rel="stylesheet" href="/assets/css/docs.css">
<section class='page-docs'>
<nav class='left-nav' data-swiftype-index='false'>
<li>
<a href="/docs/2.9.0/index" class='' >Documentation Overview</a>
</li>
<li>
<button type='button' class='group-toggle collapsed '>Quick Start Guides<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class='nav-group collapsed'>
<li>
<a href="/docs/2.9.0/quick-start/java"
class=''
>Java</a>
</li>
<li>
<a href="/docs/2.9.0/quick-start/dotnet"
class=''
>.NET/C#</a>
</li>
<li>
<a href="/docs/2.9.0/quick-start/cpp"
class=''
>C++</a>
</li>
<li>
<a href="/docs/2.9.0/quick-start/python"
class=''
>Python</a>
</li>
<li>
<a href="/docs/2.9.0/quick-start/nodejs"
class=''
>Node.JS</a>
</li>
<li>
<a href="/docs/2.9.0/quick-start/sql"
class=''
>SQL</a>
</li>
<li>
<a href="/docs/2.9.0/quick-start/php"
class=''
>PHP</a>
</li>
<li>
<a href="/docs/2.9.0/quick-start/restapi"
class=''
>REST API</a>
</li>
</nav>
</li>
<li>
<button type='button' class='group-toggle collapsed '>Installation<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class='nav-group collapsed'>
<li>
<a href="/docs/2.9.0/installation/installing-using-zip"
class=''
>Installing Using ZIP Archive</a>
</li>
<li>
<a href="/docs/2.9.0/installation/installing-using-docker"
class=''
>Installing Using Docker</a>
</li>
<li>
<a href="/docs/2.9.0/installation/deb-rpm"
class=''
>Installing DEB or RPM package</a>
</li>
<li>
<button
type='button'
class='collapsed '>Kubernetes<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class="sub_pages collapsed">
<li><a href="/docs/2.9.0/installation/kubernetes/amazon-eks-deployment" class=''>Amazon EKS</a></li>
<li><a href="/docs/2.9.0/installation/kubernetes/azure-deployment" class=''>Azure Kubernetes Service</a></li>
<li><a href="/docs/2.9.0/installation/kubernetes/gke-deployment" class=''>Google Kubernetes Engine</a></li>
</nav>
</li>
<li>
<a href="/docs/2.9.0/installation/vmware-installation"
class=''
>VMWare</a>
</li>
</nav>
</li>
<li>
<button type='button' class='group-toggle collapsed '>Setting Up<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class='nav-group collapsed'>
<li>
<a href="/docs/2.9.0/understanding-configuration"
class=''
>Understanding Configuration</a>
</li>
<li>
<a href="/docs/2.9.0/setup"
class=''
>Setting Up</a>
</li>
<li>
<a href="/docs/2.9.0/logging"
class=''
>Configuring Logging</a>
</li>
<li>
<a href="/docs/2.9.0/resources-injection"
class=''
>Resources Injection</a>
</li>
</nav>
</li>
<li>
<a href="/docs/2.9.0/starting-nodes" class='' >Starting and Stopping Nodes</a>
</li>
<li>
<button type='button' class='group-toggle collapsed '>Clustering<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class='nav-group collapsed'>
<li>
<a href="/docs/2.9.0/clustering/clustering"
class=''
>Overview</a>
</li>
<li>
<a href="/docs/2.9.0/clustering/tcp-ip-discovery"
class=''
>TCP/IP Discovery</a>
</li>
<li>
<a href="/docs/2.9.0/clustering/zookeeper-discovery"
class=''
>ZooKeeper Discovery</a>
</li>
<li>
<a href="/docs/2.9.0/clustering/discovery-in-the-cloud"
class=''
>Discovery in the Cloud</a>
</li>
<li>
<a href="/docs/2.9.0/clustering/network-configuration"
class=''
>Network Configuration</a>
</li>
<li>
<a href="/docs/2.9.0/clustering/connect-client-nodes"
class=''
>Connecting Client Nodes</a>
</li>
<li>
<a href="/docs/2.9.0/clustering/baseline-topology"
class=''
>Baseline Topology</a>
</li>
<li>
<a href="/docs/2.9.0/clustering/running-client-nodes-behind-nat"
class=''
>Running Client Nodes Behind NAT</a>
</li>
</nav>
</li>
<li>
<button type='button' class='group-toggle collapsed '>Thin Clients<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class='nav-group collapsed'>
<li>
<a href="/docs/2.9.0/thin-clients/getting-started-with-thin-clients"
class=''
>Thin Clients Overview</a>
</li>
<li>
<a href="/docs/2.9.0/thin-clients/java-thin-client"
class=''
>Java Thin Client</a>
</li>
<li>
<a href="/docs/2.9.0/thin-clients/dotnet-thin-client"
class=''
>.NET Thin Client</a>
</li>
<li>
<a href="/docs/2.9.0/thin-clients/cpp-thin-client"
class=''
>C++ Thin Client</a>
</li>
<li>
<a href="/docs/2.9.0/thin-clients/python-thin-client"
class=''
>Python Thin Client</a>
</li>
<li>
<a href="/docs/2.9.0/thin-clients/php-thin-client"
class=''
>PHP Thin Client</a>
</li>
<li>
<a href="/docs/2.9.0/thin-clients/nodejs-thin-client"
class=''
>Node.js Thin Client</a>
</li>
<li>
<button
type='button'
class='collapsed '>Binary Client Protocol<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class="sub_pages collapsed">
<li><a href="/docs/2.9.0/binary-client-protocol/binary-client-protocol" class=''>Binary Client Protocol</a></li>
<li><a href="/docs/2.9.0/binary-client-protocol/data-format" class=''>Data Format</a></li>
<li><a href="/docs/2.9.0/binary-client-protocol/key-value-queries" class=''>Key-Value Queries</a></li>
<li><a href="/docs/2.9.0/binary-client-protocol/sql-and-scan-queries" class=''>SQL and Scan Queries</a></li>
<li><a href="/docs/2.9.0/binary-client-protocol/binary-type-metadata" class=''>Binary Types Metadata</a></li>
<li><a href="/docs/2.9.0/binary-client-protocol/cache-configuration" class=''>Cache Configuration</a></li>
</nav>
</li>
</nav>
</li>
<li>
<button type='button' class='group-toggle collapsed '>Data Modeling<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class='nav-group collapsed'>
<li>
<a href="/docs/2.9.0/data-modeling/data-modeling"
class=''
>Introduction</a>
</li>
<li>
<a href="/docs/2.9.0/data-modeling/data-partitioning"
class=''
>Data Partitioning</a>
</li>
<li>
<a href="/docs/2.9.0/data-modeling/affinity-collocation"
class=''
>Affinity Colocation</a>
</li>
<li>
<a href="/docs/2.9.0/data-modeling/binary-marshaller"
class=''
>Binary Marshaller</a>
</li>
</nav>
</li>
<li>
<button type='button' class='group-toggle expanded '>Configuring Memory<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class='nav-group expanded'>
<li>
<a href="/docs/2.9.0/memory-architecture"
class='active'
>Memory Architecture</a>
</li>
<li>
<a href="/docs/2.9.0/memory-configuration/data-regions"
class=''
>Configuring Data Regions</a>
</li>
<li>
<a href="/docs/2.9.0/memory-configuration/eviction-policies"
class=''
>Eviction Policies</a>
</li>
</nav>
</li>
<li>
<button type='button' class='group-toggle collapsed '>Configuring Persistence<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class='nav-group collapsed'>
<li>
<a href="/docs/2.9.0/persistence/native-persistence"
class=''
>Ignite Persistence</a>
</li>
<li>
<a href="/docs/2.9.0/persistence/external-storage"
class=''
>External Storage</a>
</li>
<li>
<a href="/docs/2.9.0/persistence/swap"
class=''
>Swapping</a>
</li>
<li>
<a href="/docs/2.9.0/persistence/custom-cache-store"
class=''
>Implementing Custom Cache Store</a>
</li>
<li>
<a href="/docs/2.9.0/persistence/snapshots"
class=''
>Cluster Snapshots</a>
</li>
<li>
<a href="/docs/2.9.0/persistence/disk-compression"
class=''
>Disk Compression</a>
</li>
<li>
<a href="/docs/2.9.0/persistence/persistence-tuning"
class=''
>Tuning Persistence</a>
</li>
</nav>
</li>
<li>
<button type='button' class='group-toggle collapsed '>Configuring Caches<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class='nav-group collapsed'>
<li>
<a href="/docs/2.9.0/configuring-caches/configuration-overview"
class=''
>Cache Configuration</a>
</li>
<li>
<a href="/docs/2.9.0/configuring-caches/configuring-backups"
class=''
>Configuring Partition Backups</a>
</li>
<li>
<a href="/docs/2.9.0/configuring-caches/partition-loss-policy"
class=''
>Partition Loss Policy</a>
</li>
<li>
<a href="/docs/2.9.0/configuring-caches/atomicity-modes"
class=''
>Atomicity Modes</a>
</li>
<li>
<a href="/docs/2.9.0/configuring-caches/expiry-policies"
class=''
>Expiry Policy</a>
</li>
<li>
<a href="/docs/2.9.0/configuring-caches/on-heap-caching"
class=''
>On-Heap Caching</a>
</li>
<li>
<a href="/docs/2.9.0/configuring-caches/cache-groups"
class=''
>Cache Groups</a>
</li>
<li>
<a href="/docs/2.9.0/configuring-caches/near-cache"
class=''
>Near Caches</a>
</li>
</nav>
</li>
<li>
<a href="/docs/2.9.0/data-rebalancing" class='' >Data Rebalancing</a>
</li>
<li>
<a href="/docs/2.9.0/data-streaming" class='' >Data Streaming</a>
</li>
<li>
<button type='button' class='group-toggle collapsed '>Using Key-Value API<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class='nav-group collapsed'>
<li>
<a href="/docs/2.9.0/key-value-api/basic-cache-operations"
class=''
>Basic Cache Operations</a>
</li>
<li>
<a href="/docs/2.9.0/key-value-api/binary-objects"
class=''
>Working with Binary Objects</a>
</li>
<li>
<a href="/docs/2.9.0/key-value-api/using-scan-queries"
class=''
>Using Scan Queries</a>
</li>
<li>
<a href="/docs/2.9.0/read-repair"
class=''
>Read Repair</a>
</li>
</nav>
</li>
<li>
<a href="/docs/2.9.0/key-value-api/transactions" class='' >Performing Transactions</a>
</li>
<li>
<button type='button' class='group-toggle collapsed '>Working with SQL<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class='nav-group collapsed'>
<li>
<a href="/docs/2.9.0/SQL/sql-introduction"
class=''
>Introduction</a>
</li>
<li>
<a href="/docs/2.9.0/SQL/schemas"
class=''
>Understanding Schemas</a>
</li>
<li>
<a href="/docs/2.9.0/SQL/indexes"
class=''
>Defining Indexes</a>
</li>
<li>
<a href="/docs/2.9.0/SQL/sql-api"
class=''
>Using SQL API</a>
</li>
<li>
<a href="/docs/2.9.0/SQL/distributed-joins"
class=''
>Distributed Joins</a>
</li>
<li>
<a href="/docs/2.9.0/SQL/sql-transactions"
class=''
>SQL Transactions</a>
</li>
<li>
<a href="/docs/2.9.0/SQL/custom-sql-func"
class=''
>Custom SQL Functions</a>
</li>
<li>
<a href="/docs/2.9.0/SQL/JDBC/jdbc-driver"
class=''
>JDBC Driver</a>
</li>
<li>
<a href="/docs/2.9.0/SQL/JDBC/jdbc-client-driver"
class=''
>JDBC Client Driver</a>
</li>
<li>
<button
type='button'
class='collapsed '>ODBC Driver<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class="sub_pages collapsed">
<li><a href="/docs/2.9.0/SQL/ODBC/odbc-driver" class=''>ODBC Driver</a></li>
<li><a href="/docs/2.9.0//SQL/ODBC/connection-string-dsn" class=''>Connection String and DSN</a></li>
<li><a href="/docs/2.9.0/SQL/ODBC/querying-modifying-data" class=''>Querying and Modifying Data</a></li>
<li><a href="/docs/2.9.0/SQL/ODBC/specification" class=''>Specification</a></li>
<li><a href="/docs/2.9.0/SQL/ODBC/data-types" class=''>Data Types</a></li>
<li><a href="/docs/2.9.0/SQL/ODBC/error-codes" class=''>Error Codes</a></li>
</nav>
</li>
<li>
<a href="/docs/2.9.0/transactions/mvcc"
class=''
>Multiversion Concurrency Control</a>
</li>
</nav>
</li>
<li>
<button type='button' class='group-toggle collapsed '>SQL Reference<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class='nav-group collapsed'>
<li>
<a href="/docs/2.9.0/sql-reference/sql-conformance"
class=''
>SQL Conformance</a>
</li>
<li>
<a href="/docs/2.9.0/sql-reference/ddl"
class=''
>Data Definition Language (DDL)</a>
</li>
<li>
<a href="/docs/2.9.0/sql-reference/dml"
class=''
>Data Manipulation Language (DML)</a>
</li>
<li>
<a href="/docs/2.9.0/sql-reference/transactions"
class=''
>Transactions</a>
</li>
<li>
<a href="/docs/2.9.0/sql-reference/operational-commands"
class=''
>Operational Commands</a>
</li>
<li>
<a href="/docs/2.9.0/sql-reference/aggregate-functions"
class=''
>Aggregate functions</a>
</li>
<li>
<a href="/docs/2.9.0/sql-reference/numeric-functions"
class=''
>Numeric Functions</a>
</li>
<li>
<a href="/docs/2.9.0/sql-reference/string-functions"
class=''
>String Functions</a>
</li>
<li>
<a href="/docs/2.9.0/sql-reference/date-time-functions"
class=''
>Data and Time Functions</a>
</li>
<li>
<a href="/docs/2.9.0/sql-reference/system-functions"
class=''
>System Functions</a>
</li>
<li>
<a href="/docs/2.9.0/sql-reference/data-types"
class=''
>Data Types</a>
</li>
</nav>
</li>
<li>
<button type='button' class='group-toggle collapsed '>Distributed Computing<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class='nav-group collapsed'>
<li>
<a href="/docs/2.9.0/distributed-computing/distributed-computing"
class=''
>Distributed Computing API</a>
</li>
<li>
<a href="/docs/2.9.0/distributed-computing/cluster-groups"
class=''
>Cluster Groups</a>
</li>
<li>
<a href="/docs/2.9.0/distributed-computing/executor-service"
class=''
>Executor Service</a>
</li>
<li>
<a href="/docs/2.9.0/distributed-computing/map-reduce"
class=''
>MapReduce API</a>
</li>
<li>
<a href="/docs/2.9.0/distributed-computing/load-balancing"
class=''
>Load Balancing</a>
</li>
<li>
<a href="/docs/2.9.0/distributed-computing/fault-tolerance"
class=''
>Fault Tolerance</a>
</li>
<li>
<a href="/docs/2.9.0/distributed-computing/job-scheduling"
class=''
>Job Scheduling</a>
</li>
<li>
<a href="/docs/2.9.0/distributed-computing/collocated-computations"
class=''
>Colocating Computations with Data</a>
</li>
</nav>
</li>
<li>
<button type='button' class='group-toggle collapsed '>Code Deployment<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class='nav-group collapsed'>
<li>
<a href="/docs/2.9.0/code-deployment/deploying-user-code"
class=''
>Deploying User Code</a>
</li>
<li>
<a href="/docs/2.9.0/code-deployment/peer-class-loading"
class=''
>Peer Class Loading</a>
</li>
</nav>
</li>
<li>
<button type='button' class='group-toggle collapsed '>Machine Learning<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class='nav-group collapsed'>
<li>
<a href="/docs/2.9.0/machine-learning/machine-learning"
class=''
>Machine Learning</a>
</li>
<li>
<a href="/docs/2.9.0/machine-learning/partition-based-dataset"
class=''
>Partition Based Dataset</a>
</li>
<li>
<a href="/docs/2.9.0/machine-learning/updating-trained-models"
class=''
>Updating Trained Models</a>
</li>
<li>
<button
type='button'
class='collapsed '>Binary Classification<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class="sub_pages collapsed">
<li><a href="/docs/2.9.0/machine-learning/binary-classification/introduction" class=''>Introduction</a></li>
<li><a href="/docs/2.9.0/machine-learning/binary-classification/linear-svm" class=''>Linear SVM (Support Vector Machine)</a></li>
<li><a href="/docs/2.9.0/machine-learning/binary-classification/decision-trees" class=''>Decision Trees</a></li>
<li><a href="/docs/2.9.0/machine-learning/binary-classification/multilayer-perceptron" class=''>Multilayer Perceptron</a></li>
<li><a href="/docs/2.9.0/machine-learning/binary-classification/logistic-regression" class=''>Logistic Regression</a></li>
<li><a href="/docs/2.9.0/machine-learning/binary-classification/knn-classification" class=''>k-NN Classification</a></li>
<li><a href="/docs/2.9.0/machine-learning/binary-classification/ann" class=''>ANN (Approximate Nearest Neighbor)</a></li>
<li><a href="/docs/2.9.0/machine-learning/binary-classification/naive-bayes" class=''>Naive Bayes</a></li>
</nav>
</li>
<li>
<button
type='button'
class='collapsed '>Regression<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class="sub_pages collapsed">
<li><a href="/docs/2.9.0/machine-learning/regression/introduction" class=''>Introduction</a></li>
<li><a href="/docs/2.9.0/machine-learning/regression/linear-regression" class=''>Linear Regression</a></li>
<li><a href="/docs/2.9.0/machine-learning/regression/decision-trees-regression" class=''>Decision Trees Regression</a></li>
<li><a href="/docs/2.9.0/machine-learning/regression/knn-regression" class=''>k-NN Regression</a></li>
</nav>
</li>
<li>
<button
type='button'
class='collapsed '>Clustering<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class="sub_pages collapsed">
<li><a href="/docs/2.9.0/machine-learning/clustering/introduction" class=''>Introduction</a></li>
<li><a href="/docs/2.9.0/machine-learning/clustering/k-means-clustering" class=''>K-Means Clustering</a></li>
<li><a href="/docs/2.9.0/machine-learning/clustering/gaussian-mixture" class=''>Gaussian mixture (GMM)</a></li>
</nav>
</li>
<li>
<a href="/docs/2.9.0/machine-learning/preprocessing"
class=''
>Preprocessing</a>
</li>
<li>
<button
type='button'
class='collapsed '>Model Selection<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class="sub_pages collapsed">
<li><a href="/docs/2.9.0/machine-learning/model-selection/introduction" class=''>Introduction</a></li>
<li><a href="/docs/2.9.0/machine-learning/model-selection/evaluator" class=''>Evaluator</a></li>
<li><a href="/docs/2.9.0/machine-learning/model-selection/split-the-dataset-on-test-and-train-datasets" class=''>Split the dataset on test and train datasets</a></li>
<li><a href="/docs/2.9.0/machine-learning/model-selection/hyper-parameter-tuning" class=''>Hyper-parameter tuning</a></li>
<li><a href="/docs/2.9.0/machine-learning/model-selection/pipeline-api" class=''>Pipeline API</a></li>
</nav>
</li>
<li>
<a href="/docs/2.9.0/machine-learning/multiclass-classification"
class=''
>Multiclass Classification</a>
</li>
<li>
<button
type='button'
class='collapsed '>Ensemble Methods<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class="sub_pages collapsed">
<li><a href="/docs/2.9.0/machine-learning/ensemble-methods/introduction" class=''></a></li>
<li><a href="/docs/2.9.0/machine-learning/ensemble-methods/stacking" class=''>Stacking</a></li>
<li><a href="/docs/2.9.0/machine-learning/ensemble-methods/baggin" class=''>Bagging</a></li>
<li><a href="/docs/2.9.0/machine-learning/ensemble-methods/random-forest" class=''>Random Forest</a></li>
<li><a href="/docs/2.9.0/machine-learning/ensemble-methods/gradient-boosting" class=''>Gradient Boosting</a></li>
</nav>
</li>
<li>
<a href="/docs/2.9.0/machine-learning/recommendation-systems"
class=''
>Recommendation Systems</a>
</li>
<li>
<button
type='button'
class='collapsed '>Importing Model<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class="sub_pages collapsed">
<li><a href="/docs/2.9.0/machine-learning/importing-model/introduction" class=''>Introduction</a></li>
<li><a href="/docs/2.9.0/machine-learning/importing-model/model-import-from-gxboost" class=''>Import Model from XGBoost</a></li>
<li><a href="/docs/2.9.0/machine-learning/importing-model/model-import-from-apache-spark" class=''>Import Model from Apache Spark</a></li>
</nav>
</li>
</nav>
</li>
<li>
<a href="/docs/2.9.0/key-value-api/continuous-queries" class='' >Using Continuous Queries</a>
</li>
<li>
<a href="/docs/2.9.0/services/services" class='' >Using Ignite Services</a>
</li>
<li>
<a href="/docs/2.9.0/messaging" class='' >Using Ignite Messaging</a>
</li>
<li>
<button type='button' class='group-toggle collapsed '>Distributed Data Structures<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class='nav-group collapsed'>
<li>
<a href="/docs/2.9.0/data-structures/queue-and-set"
class=''
>Queue and Set</a>
</li>
<li>
<a href="/docs/2.9.0/data-structures/atomic-types"
class=''
>Atomic Types</a>
</li>
<li>
<a href="/docs/2.9.0/data-structures/countdownlatch"
class=''
>CountDownLatch</a>
</li>
<li>
<a href="/docs/2.9.0/data-structures/atomic-sequence"
class=''
>Atomic Sequence</a>
</li>
<li>
<a href="/docs/2.9.0/data-structures/semaphore"
class=''
>Semaphore</a>
</li>
<li>
<a href="/docs/2.9.0/data-structures/id-generator"
class=''
>ID Generator</a>
</li>
</nav>
</li>
<li>
<a href="/docs/2.9.0/distributed-locks" class='' >Distributed Locks</a>
</li>
<li>
<a href="/docs/2.9.0/restapi" class='' >REST API</a>
</li>
<li>
<button type='button' class='group-toggle collapsed '>.NET Specific<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class='nav-group collapsed'>
<li>
<a href="/docs/2.9.0/net-specific/net-configuration-options"
class=''
>Configuration Options</a>
</li>
<li>
<a href="/docs/2.9.0/net-specific/net-deployment-options"
class=''
>Deployment Options</a>
</li>
<li>
<a href="/docs/2.9.0/net-specific/net-standalone-nodes"
class=''
>Standalone Nodes</a>
</li>
<li>
<a href="/docs/2.9.0/net-specific/net-logging"
class=''
>Logging</a>
</li>
<li>
<a href="/docs/2.9.0/net-specific/net-linq"
class=''
>LINQ</a>
</li>
<li>
<a href="/docs/2.9.0/net-specific/net-java-services-execution"
class=''
>Java Services Execution</a>
</li>
<li>
<a href="/docs/2.9.0/net-specific/net-platform-cache"
class=''
>.NET Platform Cache</a>
</li>
<li>
<a href="/docs/2.9.0/net-specific/net-plugins"
class=''
>Plugins</a>
</li>
<li>
<a href="/docs/2.9.0/net-specific/net-serialization"
class=''
>Serialization</a>
</li>
<li>
<a href="/docs/2.9.0/net-specific/net-cross-platform-support"
class=''
>Cross-Platform Support</a>
</li>
<li>
<a href="/docs/2.9.0/net-specific/net-platform-interoperability"
class=''
>Platform Interoperability</a>
</li>
<li>
<a href="/docs/2.9.0/net-specific/net-remote-assembly-loading"
class=''
>Remote Assembly Loading</a>
</li>
<li>
<a href="/docs/2.9.0/net-specific/net-troubleshooting"
class=''
>Troubleshooting</a>
</li>
<li>
<button
type='button'
class='collapsed '>Integrations<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class="sub_pages collapsed">
<li><a href="/docs/2.9.0/net-specific/asp-net-output-caching" class=''>ASP.NET Output Caching</a></li>
<li><a href="/docs/2.9.0/net-specific/asp-net-session-state-caching" class=''>ASP.NET Session State Caching</a></li>
<li><a href="/docs/2.9.0/net-specific/net-entity-framework-cache" class=''>Entity Framework 2nd Level Cache</a></li>
</nav>
</li>
</nav>
</li>
<li>
<button type='button' class='group-toggle collapsed '>C++ Specific<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class='nav-group collapsed'>
<li>
<a href="/docs/2.9.0/cpp-specific/cpp-serialization"
class=''
>Serialization</a>
</li>
<li>
<a href="/docs/2.9.0/cpp-specific/cpp-platform-interoperability"
class=''
>Platform Interoperability</a>
</li>
<li>
<a href="/docs/2.9.0/cpp-specific/cpp-objects-lifetime"
class=''
>Objects Lifetime</a>
</li>
</nav>
</li>
<li>
<button type='button' class='group-toggle collapsed '>Monitoring<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class='nav-group collapsed'>
<li>
<a href="/docs/2.9.0/monitoring-metrics/intro"
class=''
>Introduction</a>
</li>
<li>
<a href="/docs/2.9.0/monitoring-metrics/cluster-id"
class=''
>Cluster ID and Tag</a>
</li>
<li>
<a href="/docs/2.9.0/monitoring-metrics/cluster-states"
class=''
>Cluster States</a>
</li>
<li>
<button
type='button'
class='collapsed '>Metrics<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class="sub_pages collapsed">
<li><a href="/docs/2.9.0/monitoring-metrics/configuring-metrics" class=''>Configuring Metrics</a></li>
<li><a href="/docs/2.9.0/monitoring-metrics/metrics" class=''>JMX Metrics</a></li>
</nav>
</li>
<li>
<button
type='button'
class='collapsed '>New Metrics System<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class="sub_pages collapsed">
<li><a href="/docs/2.9.0/monitoring-metrics/new-metrics-system" class=''>Introduction</a></li>
<li><a href="/docs/2.9.0/monitoring-metrics/new-metrics" class=''>Metrics</a></li>
</nav>
</li>
<li>
<a href="/docs/2.9.0/monitoring-metrics/system-views"
class=''
>System Views</a>
</li>
<li>
<a href="/docs/2.9.0/monitoring-metrics/tracing"
class=''
>Tracing</a>
</li>
</nav>
</li>
<li>
<button type='button' class='group-toggle collapsed '>Working with Events<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class='nav-group collapsed'>
<li>
<a href="/docs/2.9.0/events/listening-to-events"
class=''
>Enabling and Listenting to Events</a>
</li>
<li>
<a href="/docs/2.9.0/events/events"
class=''
>Events</a>
</li>
</nav>
</li>
<li>
<button type='button' class='group-toggle collapsed '>Tools<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class='nav-group collapsed'>
<li>
<a href="/docs/2.9.0/tools/control-script"
class=''
>Control Script</a>
</li>
<li>
<a href="/docs/2.9.0/tools/visor-cmd"
class=''
>Visor CMD</a>
</li>
<li>
<a href="/docs/2.9.0/tools/gg-control-center"
class=''
>GridGain Control Center</a>
</li>
<li>
<a href="/docs/2.9.0/tools/sqlline"
class=''
>SQLLine</a>
</li>
<li>
<a href="/docs/2.9.0/tools/tableau"
class=''
>Tableau</a>
</li>
<li>
<a href="/docs/2.9.0/tools/informatica"
class=''
>Informatica</a>
</li>
<li>
<a href="/docs/2.9.0/tools/pentaho"
class=''
>Pentaho</a>
</li>
</nav>
</li>
<li>
<button type='button' class='group-toggle collapsed '>Security<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class='nav-group collapsed'>
<li>
<a href="/docs/2.9.0/security/authentication"
class=''
>Authentication</a>
</li>
<li>
<a href="/docs/2.9.0/security/ssl-tls"
class=''
>SSL/TLS</a>
</li>
<li>
<button
type='button'
class='collapsed '>Transparent Data Encryption<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class="sub_pages collapsed">
<li><a href="/docs/2.9.0/security/tde" class=''>Introduction</a></li>
<li><a href="/docs/2.9.0/security/master-key-rotation" class=''>Master key rotation</a></li>
</nav>
</li>
<li>
<a href="/docs/2.9.0/security/sandbox"
class=''
>Sandbox</a>
</li>
</nav>
</li>
<li>
<button type='button' class='group-toggle collapsed '>Extensions and Integrations<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class='nav-group collapsed'>
<li>
<button
type='button'
class='collapsed '>Spring<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class="sub_pages collapsed">
<li><a href="/docs/2.9.0/extensions-and-integrations/spring/spring-boot" class=''>Spring Boot</a></li>
<li><a href="/docs/2.9.0/extensions-and-integrations/spring/spring-data" class=''>Spring Data</a></li>
<li><a href="/docs/2.9.0/extensions-and-integrations/spring/spring-caching" class=''>Spring Caching</a></li>
</nav>
</li>
<li>
<button
type='button'
class='collapsed '>Ignite for Spark<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class="sub_pages collapsed">
<li><a href="/docs/2.9.0/extensions-and-integrations/ignite-for-spark/overview" class=''>Overview</a></li>
<li><a href="/docs/2.9.0/extensions-and-integrations/ignite-for-spark/ignitecontext-and-rdd" class=''>IgniteContext and IgniteRDD</a></li>
<li><a href="/docs/2.9.0/extensions-and-integrations/ignite-for-spark/ignite-dataframe" class=''>Ignite DataFrame</a></li>
<li><a href="/docs/2.9.0/extensions-and-integrations/ignite-for-spark/installation" class=''>Installation</a></li>
<li><a href="/docs/2.9.0/extensions-and-integrations/ignite-for-spark/spark-shell" class=''>Test Ignite with Spark-shell</a></li>
<li><a href="/docs/2.9.0/extensions-and-integrations/ignite-for-spark/troubleshooting" class=''>Troubleshooting</a></li>
</nav>
</li>
<li>
<a href="/docs/2.9.0/extensions-and-integrations/hibernate-l2-cache"
class=''
>Hibernate L2 Cache</a>
</li>
<li>
<a href="/docs/2.9.0/extensions-and-integrations/mybatis-l2-cache"
class=''
>MyBatis L2 Cache</a>
</li>
<li>
<button
type='button'
class='collapsed '>Streaming<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class="sub_pages collapsed">
<li><a href="/docs/2.9.0/extensions-and-integrations/streaming/kafka-streamer" class=''>Kafka Streamer</a></li>
<li><a href="/docs/2.9.0/extensions-and-integrations/streaming/camel-streamer" class=''>Camel Streamer</a></li>
<li><a href="/docs/2.9.0/extensions-and-integrations/streaming/flink-streamer" class=''>Flink Streamer</a></li>
<li><a href="/docs/2.9.0/extensions-and-integrations/streaming/flume-sink" class=''>Flume Sink</a></li>
<li><a href="/docs/2.9.0/extensions-and-integrations/streaming/jms-streamer" class=''>JMS Streamer</a></li>
<li><a href="/docs/2.9.0/extensions-and-integrations/streaming/mqtt-streamer" class=''>MQTT Streamer</a></li>
<li><a href="/docs/2.9.0/extensions-and-integrations/streaming/rocketmq-streamer" class=''>RocketMQ Streamer</a></li>
<li><a href="/docs/2.9.0/extensions-and-integrations/streaming/storm-streamer" class=''>Storm Streamer</a></li>
<li><a href="/docs/2.9.0/extensions-and-integrations/streaming/zeromq-streamer" class=''>ZeroMQ Streamer</a></li>
<li><a href="/docs/2.9.0/extensions-and-integrations/streaming/twitter-streamer" class=''>Twitter Streamer</a></li>
</nav>
</li>
<li>
<button
type='button'
class='collapsed '>Cassandra Integration<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class="sub_pages collapsed">
<li><a href="/docs/2.9.0/extensions-and-integrations/cassandra/overview" class=''>Overview</a></li>
<li><a href="/docs/2.9.0/extensions-and-integrations/cassandra/configuration" class=''>Configuration</a></li>
<li><a href="/docs/2.9.0/extensions-and-integrations/cassandra/usage-examples" class=''>Usage Examples</a></li>
<li><a href="/docs/2.9.0/extensions-and-integrations/cassandra/ddl-generator" class=''>DDL Generator</a></li>
</nav>
</li>
<li>
<a href="/docs/2.9.0/extensions-and-integrations/php-pdo"
class=''
>PHP PDO</a>
</li>
</nav>
</li>
<li>
<a href="/docs/2.9.0/plugins" class='' >Plugins</a>
</li>
<li>
<button type='button' class='group-toggle collapsed '>Performance and Troubleshooting<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button>
<nav class='nav-group collapsed'>
<li>
<a href="/docs/2.9.0/perf-and-troubleshooting/general-perf-tips"
class=''
>General Performance Tips</a>
</li>
<li>
<a href="/docs/2.9.0/perf-and-troubleshooting/memory-tuning"
class=''
>Memory and JVM Tuning</a>
</li>
<li>
<a href="/docs/2.9.0/perf-and-troubleshooting/persistence-tuning"
class=''
>Persistence Tuning</a>
</li>
<li>
<a href="/docs/2.9.0/perf-and-troubleshooting/sql-tuning"
class=''
>SQL Tuning</a>
</li>
<li>
<a href="/docs/2.9.0/perf-and-troubleshooting/thread-pools-tuning"
class=''
>Thread Pools Tuning</a>
</li>
<li>
<a href="/docs/2.9.0/perf-and-troubleshooting/troubleshooting"
class=''
>Troubleshooting and Debugging</a>
</li>
<li>
<a href="/docs/2.9.0/perf-and-troubleshooting/handling-exceptions"
class=''
>Handling Exceptions</a>
</li>
<li>
<a href="/docs/2.9.0/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-architecture.adoc" target="_blank">Edit</a>
<h1>Memory Architecture</h1>
<div class="sect1">
<h2 id="overview">Overview</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Ignite memory architecture allows storing and processing data and indexes both in memory and on disk, and helps achieve in-memory performance with the durability of disk.</p>
</div>
<div class="imageblock">
<div class="content">
<img src="/docs/2.9.0/images/durable-memory-overview.png" alt="Memory architecture">
</div>
</div>
<div class="paragraph">
<p>The multi-tiered storage operates in a way similar to the virtual memory of operating systems, such as Linux.
However, one significant difference between these two types of architecture is that the multi-tiered storage always treats the disk as the superset of the data (if persistence is enabled), capable of surviving crashes and restarts, while the traditional virtual memory uses the disk only as a swap extension, which gets erased once the process stops.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="memory-architecture">Memory Architecture</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Multi-tiered architecture is a page-based memory architecture that is split into pages of fixed size. The pages are stored in <em>managed off-heap regions</em> in RAM (outside of Java heap) and are organized in a special hierarchy on disk.</p>
</div>
<div class="paragraph">
<p>Ignite maintains the same binary data representation both in memory and on disk. This removes the need for costly serialization when moving data between memory and disk.</p>
</div>
<div class="paragraph">
<p>The picture below illustrates the architecture of the multi-tiered storage.</p>
</div>
<div class="imageblock">
<div class="content">
<img src="/docs/2.9.0/images/durable-memory-diagram.png" alt="durable memory diagram" height="700px">
</div>
</div>
<div class="sect2">
<h3 id="memory-segments">Memory Segments</h3>
<div class="paragraph">
<p>Every data region starts with an initial size and has a maximum size it can grow to. The region expands to its maximum size by allocating continuous memory segments.</p>
</div>
<div class="paragraph">
<p>A memory segment is a continuous byte array or physical memory allocated from the operating system. The array is divided into pages of fixed size. There are several types of pages that can reside in the segment, as shown in the picture below.</p>
</div>
<div class="imageblock">
<div class="content">
<img src="/docs/2.9.0/images/memory-segment.png" alt="Memory Segment">
</div>
</div>
</div>
<div class="sect2">
<h3 id="data-pages">Data Pages</h3>
<div class="paragraph">
<p>A data page stores entries you put into caches from the application side.</p>
</div>
<div class="paragraph">
<p>Usually, a single data page holds multiple key-value entries in order to use the memory as efficiently as possible and avoid memory fragmentation.
When a new entry is added to a cache, Ignite looks for an optimal page that can fit the whole key-value entry.</p>
</div>
<div class="paragraph">
<p>However, if an entry&#8217;s total size exceeds the page size configured via the <code>DataStorageConfiguration.setPageSize(..)</code> property, then the entry occupies more than one data page.</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>