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>.NET Thin Client</a>
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<li><a href="/docs/2.10.0/binary-client-protocol/key-value-queries" class=''>Key-Value Queries</a></li>
<li><a href="/docs/2.10.0/binary-client-protocol/sql-and-scan-queries" class=''>SQL and Scan Queries</a></li>
<li><a href="/docs/2.10.0/binary-client-protocol/binary-type-metadata" class=''>Binary Types Metadata</a></li>
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<a href="/docs/2.10.0/data-modeling/affinity-collocation"
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<a href="/docs/2.10.0/data-modeling/binary-marshaller"
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<a href="/docs/2.10.0/memory-configuration/data-regions"
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<a href="/docs/2.10.0/memory-configuration/eviction-policies"
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<a href="/docs/2.10.0/persistence/swap"
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<a href="/docs/2.10.0/persistence/custom-cache-store"
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<li>
<a href="/docs/2.10.0/persistence/snapshots"
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<a href="/docs/2.10.0/persistence/disk-compression"
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<a href="/docs/2.10.0/persistence/persistence-tuning"
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<button type='button' class='group-toggle expanded '>Configuring Caches<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
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<a href="/docs/2.10.0/configuring-caches/partition-loss-policy"
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<a href="/docs/2.10.0/configuring-caches/atomicity-modes"
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<a href="/docs/2.10.0/configuring-caches/expiry-policies"
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<a href="/docs/2.10.0/configuring-caches/on-heap-caching"
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<a href="/docs/2.10.0/configuring-caches/cache-groups"
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<a href="/docs/2.10.0/configuring-caches/near-cache"
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<li>
<a href="/docs/2.10.0/data-rebalancing" class='' >Data Rebalancing</a>
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<a href="/docs/2.10.0/data-streaming" class='' >Data Streaming</a>
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<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>
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<a href="/docs/2.10.0/key-value-api/basic-cache-operations"
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<a href="/docs/2.10.0/read-repair"
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<a href="/docs/2.10.0/key-value-api/transactions" class='' >Performing Transactions</a>
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<a href="/docs/2.10.0/SQL/sql-introduction"
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<a href="/docs/2.10.0/SQL/schemas"
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<a href="/docs/2.10.0/SQL/indexes"
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<a href="/docs/2.10.0/sql-reference/ddl"
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<a href="/docs/2.10.0/sql-reference/dml"
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<a href="/docs/2.10.0/sql-reference/aggregate-functions"
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<a href="/docs/2.10.0/sql-reference/date-time-functions"
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<a href="/docs/2.10.0/sql-reference/system-functions"
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<a href="/docs/2.10.0/distributed-computing/cluster-groups"
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<a href="/docs/2.10.0/distributed-computing/executor-service"
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>Executor Service</a>
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<a href="/docs/2.10.0/distributed-computing/map-reduce"
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>MapReduce API</a>
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<a href="/docs/2.10.0/distributed-computing/load-balancing"
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<a href="/docs/2.10.0/distributed-computing/fault-tolerance"
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>Fault Tolerance</a>
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<a href="/docs/2.10.0/distributed-computing/job-scheduling"
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>Job Scheduling</a>
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<a href="/docs/2.10.0/distributed-computing/collocated-computations"
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>Colocating Computations with Data</a>
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<a href="/docs/2.10.0/code-deployment/deploying-user-code"
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<a href="/docs/2.10.0/code-deployment/peer-class-loading"
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<a href="/docs/2.10.0/machine-learning/partition-based-dataset"
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>Partition Based Dataset</a>
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<a href="/docs/2.10.0/machine-learning/updating-trained-models"
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<button
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<li><a href="/docs/2.10.0/machine-learning/binary-classification/introduction" class=''>Introduction</a></li>
<li><a href="/docs/2.10.0/machine-learning/binary-classification/linear-svm" class=''>Linear SVM (Support Vector Machine)</a></li>
<li><a href="/docs/2.10.0/machine-learning/binary-classification/decision-trees" class=''>Decision Trees</a></li>
<li><a href="/docs/2.10.0/machine-learning/binary-classification/multilayer-perceptron" class=''>Multilayer Perceptron</a></li>
<li><a href="/docs/2.10.0/machine-learning/binary-classification/logistic-regression" class=''>Logistic Regression</a></li>
<li><a href="/docs/2.10.0/machine-learning/binary-classification/knn-classification" class=''>k-NN Classification</a></li>
<li><a href="/docs/2.10.0/machine-learning/binary-classification/ann" class=''>ANN (Approximate Nearest Neighbor)</a></li>
<li><a href="/docs/2.10.0/machine-learning/binary-classification/naive-bayes" class=''>Naive Bayes</a></li>
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<li><a href="/docs/2.10.0/machine-learning/regression/introduction" class=''>Introduction</a></li>
<li><a href="/docs/2.10.0/machine-learning/regression/linear-regression" class=''>Linear Regression</a></li>
<li><a href="/docs/2.10.0/machine-learning/regression/decision-trees-regression" class=''>Decision Trees Regression</a></li>
<li><a href="/docs/2.10.0/machine-learning/regression/knn-regression" class=''>k-NN Regression</a></li>
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<button
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<li><a href="/docs/2.10.0/machine-learning/clustering/introduction" class=''>Introduction</a></li>
<li><a href="/docs/2.10.0/machine-learning/clustering/k-means-clustering" class=''>K-Means Clustering</a></li>
<li><a href="/docs/2.10.0/machine-learning/clustering/gaussian-mixture" class=''>Gaussian mixture (GMM)</a></li>
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<li>
<a href="/docs/2.10.0/machine-learning/preprocessing"
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<button
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<li><a href="/docs/2.10.0/machine-learning/model-selection/introduction" class=''>Introduction</a></li>
<li><a href="/docs/2.10.0/machine-learning/model-selection/evaluator" class=''>Evaluator</a></li>
<li><a href="/docs/2.10.0/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/2.10.0/machine-learning/model-selection/hyper-parameter-tuning" class=''>Hyper-parameter tuning</a></li>
<li><a href="/docs/2.10.0/machine-learning/model-selection/pipeline-api" class=''>Pipeline API</a></li>
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</li>
<li>
<a href="/docs/2.10.0/machine-learning/multiclass-classification"
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>Multiclass Classification</a>
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<li>
<button
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class='collapsed '>Ensemble Methods<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
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<li><a href="/docs/2.10.0/machine-learning/ensemble-methods/introduction" class=''></a></li>
<li><a href="/docs/2.10.0/machine-learning/ensemble-methods/stacking" class=''>Stacking</a></li>
<li><a href="/docs/2.10.0/machine-learning/ensemble-methods/baggin" class=''>Bagging</a></li>
<li><a href="/docs/2.10.0/machine-learning/ensemble-methods/random-forest" class=''>Random Forest</a></li>
<li><a href="/docs/2.10.0/machine-learning/ensemble-methods/gradient-boosting" class=''>Gradient Boosting</a></li>
</nav>
</li>
<li>
<a href="/docs/2.10.0/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" width="6" height="10"></button>
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<article data-swiftype-index='true'>
<a class='edit-link' href="https://github.com/apache/ignite/tree/IGNITE-7595/docs/_docs/configuring-caches/configuring-backups.adoc" target="_blank">Edit</a>
<h1>Configuring Partition Backups</h1>
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>By default, Ignite keeps a single copy of each partition (a single copy of the entire data set). In this case, if one or multiple nodes become unavailable, you lose access to partitions stored on these nodes. To avoid this, you can configure Ignite to maintain backup copies of each partition.</p>
</div>
<div class="admonitionblock important">
<table>
<tr>
<td class="icon">
<div class="title">Important</div>
</td>
<td class="content">
By default, backups are disabled.
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>Backup copies are configured per cache (table).
If you configure 2 backup copies, the cluster maintains 3 copies of each partition.
One of the partitions is called the <em>primary</em> partition, and the other two are called <em>backup</em> partitions.
By extension, the node that has the primary partition is called the <em>primary node for the keys stored in the partition</em>.
The node with backup partitions is called the <em>backup node</em>.</p>
</div>
<div class="paragraph">
<p>When a node with the primary partition for some key leaves the cluster, Ignite triggers the partition map exchange (PME) process.
PME labels one of the backup partitions (if they are configured) for the key as primary.</p>
</div>
<div class="paragraph">
<p>Backup partitions increase the availability of your data, and in some cases, the speed of read operations, since Ignite reads data from backed-up partitions if they are available on the local node (this is the default behavior that can be disabled. See <a href="/docs/2.10.0/configuring-caches/configuration-overview#readfrombackup">Cache Configuration</a> for details.). However, they also increase memory consumption or the size of the persistent storage (if enabled).</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="configuring-backups">Configuring Backups</h2>
<div class="sectionbody">
<div class="paragraph">
<p>To configure the number of backup copies, set the <code>backups</code> property in the cache configuration.</p>
</div>
<code-tabs><code-tab data-tab='XML'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="xml"><span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.IgniteConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"cacheConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.CacheConfiguration"</span><span class="nt">&gt;</span>
<span class="c">&lt;!-- Set the cache name. --&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"name"</span> <span class="na">value=</span><span class="s">"cacheName"</span><span class="nt">/&gt;</span>
<span class="c">&lt;!-- Set the cache mode. --&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"cacheMode"</span> <span class="na">value=</span><span class="s">"PARTITIONED"</span><span class="nt">/&gt;</span>
<span class="c">&lt;!-- Number of backup copies --&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"backups"</span> <span class="na">value=</span><span class="s">"1"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;/property&gt;</span>
<span class="nt">&lt;/bean&gt;</span></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="nc">CacheConfiguration</span> <span class="n">cacheCfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">CacheConfiguration</span><span class="o">();</span>
<span class="n">cacheCfg</span><span class="o">.</span><span class="na">setName</span><span class="o">(</span><span class="s">"cacheName"</span><span class="o">);</span>
<span class="n">cacheCfg</span><span class="o">.</span><span class="na">setCacheMode</span><span class="o">(</span><span class="nc">CacheMode</span><span class="o">.</span><span class="na">PARTITIONED</span><span class="o">);</span>
<span class="n">cacheCfg</span><span class="o">.</span><span class="na">setBackups</span><span class="o">(</span><span class="mi">1</span><span class="o">);</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="n">cfg</span><span class="o">.</span><span class="na">setCacheConfiguration</span><span class="o">(</span><span class="n">cacheCfg</span><span class="o">);</span>
<span class="c1">// Start the node.</span>
<span class="nc">Ignite</span> <span class="n">ignite</span> <span class="o">=</span> <span class="nc">Ignition</span><span class="o">.</span><span class="na">start</span><span class="o">(</span><span class="n">cfg</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">CacheConfiguration</span> <span class="p">=</span> <span class="k">new</span><span class="p">[]</span>
<span class="p">{</span>
<span class="k">new</span> <span class="n">CacheConfiguration</span>
<span class="p">{</span>
<span class="n">Name</span> <span class="p">=</span> <span class="s">"myCache"</span><span class="p">,</span>
<span class="n">CacheMode</span> <span class="p">=</span> <span class="n">CacheMode</span><span class="p">.</span><span class="n">Partitioned</span><span class="p">,</span>
<span class="n">Backups</span> <span class="p">=</span> <span class="m">1</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="p">};</span>
<span class="n">Ignition</span><span class="p">.</span><span class="nf">Start</span><span class="p">(</span><span class="n">cfg</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="sect1">
<h2 id="synchronous-and-asynchronous-backups">Synchronous and Asynchronous Backups</h2>
<div class="sectionbody">
<div class="paragraph">
<p>You can configure whether updates of primary and backup copies should be synchronous or asynchronous by specifying a write synchronization mode.
You can set the write synchronization mode in the cache configuration:</p>
</div>
<code-tabs><code-tab data-tab='XML'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="xml"><span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.IgniteConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"cacheConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.CacheConfiguration"</span><span class="nt">&gt;</span>
<span class="c">&lt;!-- Set the cache name. --&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"name"</span> <span class="na">value=</span><span class="s">"cacheName"</span><span class="nt">/&gt;</span>
<span class="c">&lt;!-- Number of backup copies --&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"backups"</span> <span class="na">value=</span><span class="s">"1"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"writeSynchronizationMode"</span> <span class="na">value=</span><span class="s">"FULL_SYNC"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;/property&gt;</span>
<span class="nt">&lt;/bean&gt;</span></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="nc">CacheConfiguration</span> <span class="n">cacheCfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">CacheConfiguration</span><span class="o">();</span>
<span class="n">cacheCfg</span><span class="o">.</span><span class="na">setName</span><span class="o">(</span><span class="s">"cacheName"</span><span class="o">);</span>
<span class="n">cacheCfg</span><span class="o">.</span><span class="na">setBackups</span><span class="o">(</span><span class="mi">1</span><span class="o">);</span>
<span class="n">cacheCfg</span><span class="o">.</span><span class="na">setWriteSynchronizationMode</span><span class="o">(</span><span class="nc">CacheWriteSynchronizationMode</span><span class="o">.</span><span class="na">FULL_SYNC</span><span class="o">);</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="n">cfg</span><span class="o">.</span><span class="na">setCacheConfiguration</span><span class="o">(</span><span class="n">cacheCfg</span><span class="o">);</span>
<span class="c1">// Start the node.</span>
<span class="nc">Ignition</span><span class="o">.</span><span class="na">start</span><span class="o">(</span><span class="n">cfg</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">CacheConfiguration</span> <span class="p">=</span> <span class="k">new</span><span class="p">[]</span>
<span class="p">{</span>
<span class="k">new</span> <span class="n">CacheConfiguration</span>
<span class="p">{</span>
<span class="n">Name</span> <span class="p">=</span> <span class="s">"myCache"</span><span class="p">,</span>
<span class="n">WriteSynchronizationMode</span> <span class="p">=</span> <span class="n">CacheWriteSynchronizationMode</span><span class="p">.</span><span class="n">FullSync</span><span class="p">,</span>
<span class="n">Backups</span> <span class="p">=</span> <span class="m">1</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="p">};</span>
<span class="n">Ignition</span><span class="p">.</span><span class="nf">Start</span><span class="p">(</span><span class="n">cfg</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>The write synchronization mode can be set to the following values:</p>
</div>
<table class="tableblock frame-all grid-all stripes-even stretch">
<colgroup>
<col style="width: 16.6666%;">
<col style="width: 83.3334%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">Value</th>
<th class="tableblock halign-left valign-top">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">FULL_SYNC</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Client node will wait for write or commit to complete on all participating remote nodes (primary and backup).</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">FULL_ASYNC</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Client node does not wait for responses from participating nodes, in which case remote nodes may get their state updated slightly after any of the cache write methods complete or after the Transaction.commit() method completes.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">PRIMARY_SYNC</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">This is the default mode. Client node will wait for write or commit to complete on primary node, but will not wait for backups to be updated.</p></td>
</tr>
</tbody>
</table>
</div>
</div>
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