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>.NET/C#</a>
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<a href="/docs/2.9.1/quick-start/sql"
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>SQL</a>
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<a href="/docs/2.9.1/quick-start/php"
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>PHP</a>
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>Installing Using Docker</a>
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<li>
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>Installing DEB or RPM package</a>
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>Setting Up</a>
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<li>
<a href="/docs/2.9.1/logging"
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<li>
<a href="/docs/2.9.1/resources-injection"
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<li>
<a href="/docs/2.9.1/starting-nodes" class='' >Starting and Stopping Nodes</a>
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<a href="/docs/2.9.1/clustering/clustering"
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>TCP/IP Discovery</a>
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<li>
<a href="/docs/2.9.1/clustering/zookeeper-discovery"
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>ZooKeeper Discovery</a>
</li>
<li>
<a href="/docs/2.9.1/clustering/discovery-in-the-cloud"
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>Discovery in the Cloud</a>
</li>
<li>
<a href="/docs/2.9.1/clustering/network-configuration"
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>Network Configuration</a>
</li>
<li>
<a href="/docs/2.9.1/clustering/connect-client-nodes"
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>Connecting Client Nodes</a>
</li>
<li>
<a href="/docs/2.9.1/clustering/baseline-topology"
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>Baseline Topology</a>
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<a href="/docs/2.9.1/thin-clients/java-thin-client"
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>Java Thin Client</a>
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<li>
<a href="/docs/2.9.1/thin-clients/dotnet-thin-client"
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>.NET Thin Client</a>
</li>
<li>
<a href="/docs/2.9.1/thin-clients/cpp-thin-client"
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>C++ Thin Client</a>
</li>
<li>
<a href="/docs/2.9.1/thin-clients/python-thin-client"
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>Python Thin Client</a>
</li>
<li>
<a href="/docs/2.9.1/thin-clients/php-thin-client"
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>PHP Thin Client</a>
</li>
<li>
<a href="/docs/2.9.1/thin-clients/nodejs-thin-client"
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>Node.js Thin Client</a>
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<button
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<li><a href="/docs/2.9.1/binary-client-protocol/binary-client-protocol" class=''>Binary Client Protocol</a></li>
<li><a href="/docs/2.9.1/binary-client-protocol/data-format" class=''>Data Format</a></li>
<li><a href="/docs/2.9.1/binary-client-protocol/key-value-queries" class=''>Key-Value Queries</a></li>
<li><a href="/docs/2.9.1/binary-client-protocol/sql-and-scan-queries" class=''>SQL and Scan Queries</a></li>
<li><a href="/docs/2.9.1/binary-client-protocol/binary-type-metadata" class=''>Binary Types Metadata</a></li>
<li><a href="/docs/2.9.1/binary-client-protocol/cache-configuration" class=''>Cache Configuration</a></li>
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<li>
<a href="/docs/2.9.1/data-modeling/data-modeling"
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<li>
<a href="/docs/2.9.1/data-modeling/data-partitioning"
class=''
>Data Partitioning</a>
</li>
<li>
<a href="/docs/2.9.1/data-modeling/affinity-collocation"
class=''
>Affinity Colocation</a>
</li>
<li>
<a href="/docs/2.9.1/data-modeling/binary-marshaller"
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>Binary Marshaller</a>
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</li>
<li>
<button type='button' class='group-toggle collapsed '>Configuring Memory<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
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<a href="/docs/2.9.1/memory-architecture"
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>Memory Architecture</a>
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<li>
<a href="/docs/2.9.1/memory-configuration/data-regions"
class=''
>Configuring Data Regions</a>
</li>
<li>
<a href="/docs/2.9.1/memory-configuration/eviction-policies"
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>Eviction Policies</a>
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<li>
<button type='button' class='group-toggle collapsed '>Configuring Persistence<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
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<li>
<a href="/docs/2.9.1/persistence/native-persistence"
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>Ignite Persistence</a>
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<li>
<a href="/docs/2.9.1/persistence/external-storage"
class=''
>External Storage</a>
</li>
<li>
<a href="/docs/2.9.1/persistence/swap"
class=''
>Swapping</a>
</li>
<li>
<a href="/docs/2.9.1/persistence/custom-cache-store"
class=''
>Implementing Custom Cache Store</a>
</li>
<li>
<a href="/docs/2.9.1/persistence/snapshots"
class=''
>Cluster Snapshots</a>
</li>
<li>
<a href="/docs/2.9.1/persistence/disk-compression"
class=''
>Disk Compression</a>
</li>
<li>
<a href="/docs/2.9.1/persistence/persistence-tuning"
class=''
>Tuning Persistence</a>
</li>
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</li>
<li>
<button type='button' class='group-toggle collapsed '>Configuring Caches<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
<nav class='nav-group collapsed'>
<li>
<a href="/docs/2.9.1/configuring-caches/configuration-overview"
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>Cache Configuration</a>
</li>
<li>
<a href="/docs/2.9.1/configuring-caches/configuring-backups"
class=''
>Configuring Partition Backups</a>
</li>
<li>
<a href="/docs/2.9.1/configuring-caches/partition-loss-policy"
class=''
>Partition Loss Policy</a>
</li>
<li>
<a href="/docs/2.9.1/configuring-caches/atomicity-modes"
class=''
>Atomicity Modes</a>
</li>
<li>
<a href="/docs/2.9.1/configuring-caches/expiry-policies"
class=''
>Expiry Policy</a>
</li>
<li>
<a href="/docs/2.9.1/configuring-caches/on-heap-caching"
class=''
>On-Heap Caching</a>
</li>
<li>
<a href="/docs/2.9.1/configuring-caches/cache-groups"
class=''
>Cache Groups</a>
</li>
<li>
<a href="/docs/2.9.1/configuring-caches/near-cache"
class=''
>Near Caches</a>
</li>
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</li>
<li>
<a href="/docs/2.9.1/data-rebalancing" class='active' >Data Rebalancing</a>
</li>
<li>
<a href="/docs/2.9.1/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" width="6" height="10"></button>
<nav class='nav-group collapsed'>
<li>
<a href="/docs/2.9.1/key-value-api/basic-cache-operations"
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</li>
<li>
<a href="/docs/2.9.1/key-value-api/binary-objects"
class=''
>Working with Binary Objects</a>
</li>
<li>
<a href="/docs/2.9.1/key-value-api/using-scan-queries"
class=''
>Using Scan Queries</a>
</li>
<li>
<a href="/docs/2.9.1/read-repair"
class=''
>Read Repair</a>
</li>
</nav>
</li>
<li>
<a href="/docs/2.9.1/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" width="6" height="10"></button>
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<li>
<a href="/docs/2.9.1/SQL/sql-introduction"
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>Introduction</a>
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<li>
<a href="/docs/2.9.1/SQL/schemas"
class=''
>Understanding Schemas</a>
</li>
<li>
<a href="/docs/2.9.1/SQL/indexes"
class=''
>Defining Indexes</a>
</li>
<li>
<a href="/docs/2.9.1/SQL/sql-api"
class=''
>Using SQL API</a>
</li>
<li>
<a href="/docs/2.9.1/SQL/distributed-joins"
class=''
>Distributed Joins</a>
</li>
<li>
<a href="/docs/2.9.1/SQL/sql-transactions"
class=''
>SQL Transactions</a>
</li>
<li>
<a href="/docs/2.9.1/SQL/custom-sql-func"
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>Custom SQL Functions</a>
</li>
<li>
<a href="/docs/2.9.1/SQL/JDBC/jdbc-driver"
class=''
>JDBC Driver</a>
</li>
<li>
<a href="/docs/2.9.1/SQL/JDBC/jdbc-client-driver"
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>JDBC Client Driver</a>
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<button
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<li><a href="/docs/2.9.1/SQL/ODBC/odbc-driver" class=''>ODBC Driver</a></li>
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<li><a href="/docs/2.9.1/SQL/ODBC/querying-modifying-data" class=''>Querying and Modifying Data</a></li>
<li><a href="/docs/2.9.1/SQL/ODBC/specification" class=''>Specification</a></li>
<li><a href="/docs/2.9.1/SQL/ODBC/data-types" class=''>Data Types</a></li>
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<li>
<a href="/docs/2.9.1/transactions/mvcc"
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<button type='button' class='group-toggle collapsed '>SQL Reference<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
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<a href="/docs/2.9.1/sql-reference/sql-conformance"
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<li>
<a href="/docs/2.9.1/sql-reference/ddl"
class=''
>Data Definition Language (DDL)</a>
</li>
<li>
<a href="/docs/2.9.1/sql-reference/dml"
class=''
>Data Manipulation Language (DML)</a>
</li>
<li>
<a href="/docs/2.9.1/sql-reference/transactions"
class=''
>Transactions</a>
</li>
<li>
<a href="/docs/2.9.1/sql-reference/operational-commands"
class=''
>Operational Commands</a>
</li>
<li>
<a href="/docs/2.9.1/sql-reference/aggregate-functions"
class=''
>Aggregate functions</a>
</li>
<li>
<a href="/docs/2.9.1/sql-reference/numeric-functions"
class=''
>Numeric Functions</a>
</li>
<li>
<a href="/docs/2.9.1/sql-reference/string-functions"
class=''
>String Functions</a>
</li>
<li>
<a href="/docs/2.9.1/sql-reference/date-time-functions"
class=''
>Data and Time Functions</a>
</li>
<li>
<a href="/docs/2.9.1/sql-reference/system-functions"
class=''
>System Functions</a>
</li>
<li>
<a href="/docs/2.9.1/sql-reference/data-types"
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>Data Types</a>
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<li>
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<li>
<a href="/docs/2.9.1/distributed-computing/distributed-computing"
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>Distributed Computing API</a>
</li>
<li>
<a href="/docs/2.9.1/distributed-computing/cluster-groups"
class=''
>Cluster Groups</a>
</li>
<li>
<a href="/docs/2.9.1/distributed-computing/executor-service"
class=''
>Executor Service</a>
</li>
<li>
<a href="/docs/2.9.1/distributed-computing/map-reduce"
class=''
>MapReduce API</a>
</li>
<li>
<a href="/docs/2.9.1/distributed-computing/load-balancing"
class=''
>Load Balancing</a>
</li>
<li>
<a href="/docs/2.9.1/distributed-computing/fault-tolerance"
class=''
>Fault Tolerance</a>
</li>
<li>
<a href="/docs/2.9.1/distributed-computing/job-scheduling"
class=''
>Job Scheduling</a>
</li>
<li>
<a href="/docs/2.9.1/distributed-computing/collocated-computations"
class=''
>Colocating Computations with Data</a>
</li>
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</li>
<li>
<button type='button' class='group-toggle collapsed '>Code Deployment<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
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<li>
<a href="/docs/2.9.1/code-deployment/deploying-user-code"
class=''
>Deploying User Code</a>
</li>
<li>
<a href="/docs/2.9.1/code-deployment/peer-class-loading"
class=''
>Peer Class Loading</a>
</li>
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</li>
<li>
<button type='button' class='group-toggle collapsed '>Machine Learning<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
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<li>
<a href="/docs/2.9.1/machine-learning/machine-learning"
class=''
>Machine Learning</a>
</li>
<li>
<a href="/docs/2.9.1/machine-learning/partition-based-dataset"
class=''
>Partition Based Dataset</a>
</li>
<li>
<a href="/docs/2.9.1/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" width="6" height="10"></button>
<nav class="sub_pages collapsed">
<li><a href="/docs/2.9.1/machine-learning/binary-classification/introduction" class=''>Introduction</a></li>
<li><a href="/docs/2.9.1/machine-learning/binary-classification/linear-svm" class=''>Linear SVM (Support Vector Machine)</a></li>
<li><a href="/docs/2.9.1/machine-learning/binary-classification/decision-trees" class=''>Decision Trees</a></li>
<li><a href="/docs/2.9.1/machine-learning/binary-classification/multilayer-perceptron" class=''>Multilayer Perceptron</a></li>
<li><a href="/docs/2.9.1/machine-learning/binary-classification/logistic-regression" class=''>Logistic Regression</a></li>
<li><a href="/docs/2.9.1/machine-learning/binary-classification/knn-classification" class=''>k-NN Classification</a></li>
<li><a href="/docs/2.9.1/machine-learning/binary-classification/ann" class=''>ANN (Approximate Nearest Neighbor)</a></li>
<li><a href="/docs/2.9.1/machine-learning/binary-classification/naive-bayes" class=''>Naive Bayes</a></li>
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</li>
<li>
<button
type='button'
class='collapsed '>Regression<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
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<li><a href="/docs/2.9.1/machine-learning/regression/introduction" class=''>Introduction</a></li>
<li><a href="/docs/2.9.1/machine-learning/regression/linear-regression" class=''>Linear Regression</a></li>
<li><a href="/docs/2.9.1/machine-learning/regression/decision-trees-regression" class=''>Decision Trees Regression</a></li>
<li><a href="/docs/2.9.1/machine-learning/regression/knn-regression" class=''>k-NN Regression</a></li>
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</li>
<li>
<button
type='button'
class='collapsed '>Clustering<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
<nav class="sub_pages collapsed">
<li><a href="/docs/2.9.1/machine-learning/clustering/introduction" class=''>Introduction</a></li>
<li><a href="/docs/2.9.1/machine-learning/clustering/k-means-clustering" class=''>K-Means Clustering</a></li>
<li><a href="/docs/2.9.1/machine-learning/clustering/gaussian-mixture" class=''>Gaussian mixture (GMM)</a></li>
</nav>
</li>
<li>
<a href="/docs/2.9.1/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" width="6" height="10"></button>
<nav class="sub_pages collapsed">
<li><a href="/docs/2.9.1/machine-learning/model-selection/introduction" class=''>Introduction</a></li>
<li><a href="/docs/2.9.1/machine-learning/model-selection/evaluator" class=''>Evaluator</a></li>
<li><a href="/docs/2.9.1/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/2.9.1/machine-learning/model-selection/hyper-parameter-tuning" class=''>Hyper-parameter tuning</a></li>
<li><a href="/docs/2.9.1/machine-learning/model-selection/pipeline-api" class=''>Pipeline API</a></li>
</nav>
</li>
<li>
<a href="/docs/2.9.1/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" width="6" height="10"></button>
<nav class="sub_pages collapsed">
<li><a href="/docs/2.9.1/machine-learning/ensemble-methods/introduction" class=''></a></li>
<li><a href="/docs/2.9.1/machine-learning/ensemble-methods/stacking" class=''>Stacking</a></li>
<li><a href="/docs/2.9.1/machine-learning/ensemble-methods/baggin" class=''>Bagging</a></li>
<li><a href="/docs/2.9.1/machine-learning/ensemble-methods/random-forest" class=''>Random Forest</a></li>
<li><a href="/docs/2.9.1/machine-learning/ensemble-methods/gradient-boosting" class=''>Gradient Boosting</a></li>
</nav>
</li>
<li>
<a href="/docs/2.9.1/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" width="6" height="10"></button>
<nav class="sub_pages collapsed">
<li><a href="/docs/2.9.1/machine-learning/importing-model/introduction" class=''>Introduction</a></li>
<li><a href="/docs/2.9.1/machine-learning/importing-model/model-import-from-gxboost" class=''>Import Model from XGBoost</a></li>
<li><a href="/docs/2.9.1/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/2.9.1/key-value-api/continuous-queries" class='' >Using Continuous Queries</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/data-rebalancing.adoc" target="_blank">Edit</a>
<h1>Data Rebalancing</h1>
<div class="sect1">
<h2 id="overview">Overview</h2>
<div class="sectionbody">
<div class="paragraph">
<p>When a new node joins the cluster, some of the partitions are relocated to the new node so that the data remains distributed equally in the cluster. This process is called <em>data rebalancing</em>.</p>
</div>
<div class="paragraph">
<p>If an existing node permanently leaves the cluster and backups are not configured, you lose the partitions stored on this node.
When backups are configured, one of the backup copies of the lost partitions becomes a primary partition and the rebalancing process is initiated.</p>
</div>
<div class="admonitionblock caution">
<table>
<tr>
<td class="icon">
<div class="title">Caution</div>
</td>
<td class="content">
<div class="paragraph">
<p>Data rebalancing is triggered by changes in the <a href="/docs/2.9.1/clustering/baseline-topology">Baseline Topology</a>.
In pure in-memory clusters, the default behavior is to start rebalancing immediately when a node leaves or joins the cluster (the baseline topology changes automatically).
In clusters with persistence, the baseline topology has to be changed manually (default behavior), or can be changed automatically when <a href="/docs/2.9.1/clustering/baseline-topology#baseline-topology-autoadjustment">automatic baseline adjustment</a> is enabled.</p>
</div>
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>Rebalancing is configured per cache.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="configuring-rebalancing-mode">Configuring Rebalancing Mode</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Ignite supports both synchronous and asynchronous rebalancing.
In the synchronous mode, any operation on the cache data is blocked until rebalancing is finished.
In the asynchronous mode, the rebalancing process is done asynchronously.
You can also disable rebalancing for a particular cache.</p>
</div>
<div class="paragraph">
<p>To change the rebalancing mode, set one of the following values in the cache configuration.</p>
</div>
<div class="ulist">