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>.NET Thin Client</a>
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<a href="/docs/latest/data-modeling/binary-marshaller"
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<a href="/docs/latest/memory-configuration/eviction-policies"
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>Eviction Policies</a>
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<a href="/docs/latest/memory-configuration/replacement-policies"
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<a href="/docs/latest/persistence/native-persistence"
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<a href="/docs/latest/persistence/swap"
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<a href="/docs/latest/persistence/custom-cache-store"
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<a href="/docs/latest/persistence/snapshot-directory"
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<a href="/docs/latest/persistence/disk-compression"
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<li>
<a href="/docs/latest/persistence/persistence-tuning"
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<li>
<a href="/docs/latest/persistence/change-data-capture"
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<li>
<a href="/docs/latest/snapshots/snapshots" class='' >Cluster Snapshots</a>
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<a href="/docs/latest/configuring-caches/configuring-backups"
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<a href="/docs/latest/configuring-caches/partition-loss-policy"
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<a href="/docs/latest/configuring-caches/atomicity-modes"
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>Atomicity Modes</a>
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<a href="/docs/latest/configuring-caches/expiry-policies"
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<a href="/docs/latest/configuring-caches/on-heap-caching"
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<a href="/docs/latest/configuring-caches/cache-groups"
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<a href="/docs/latest/configuring-caches/near-cache"
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<li>
<a href="/docs/latest/data-rebalancing" class='' >Data Rebalancing</a>
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<li>
<a href="/docs/latest/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/latest/key-value-api/using-cache-queries"
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<a href="/docs/latest/read-repair"
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<a href="/docs/latest/key-value-api/transactions" class='' >Performing Transactions</a>
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<a href="/docs/latest/SQL/sql-introduction"
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<a href="/docs/latest/SQL/indexes"
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<a href="/docs/latest/SQL/sql-api"
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<a href="/docs/latest/SQL/distributed-joins"
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<a href="/docs/latest/SQL/custom-sql-func"
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<a href="/docs/latest/SQL/JDBC/jdbc-client-driver"
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<a href="/docs/latest/distributed-computing/map-reduce"
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<a href="/docs/latest/distributed-computing/collocated-computations"
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<a href="/docs/latest/machine-learning/updating-trained-models"
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>Updating Trained Models</a>
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<li><a href="/docs/latest/machine-learning/binary-classification/introduction" class=''>Introduction</a></li>
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<li><a href="/docs/latest/machine-learning/binary-classification/decision-trees" class=''>Decision Trees</a></li>
<li><a href="/docs/latest/machine-learning/binary-classification/multilayer-perceptron" class=''>Multilayer Perceptron</a></li>
<li><a href="/docs/latest/machine-learning/binary-classification/logistic-regression" class=''>Logistic Regression</a></li>
<li><a href="/docs/latest/machine-learning/binary-classification/knn-classification" class=''>k-NN Classification</a></li>
<li><a href="/docs/latest/machine-learning/binary-classification/ann" class=''>ANN (Approximate Nearest Neighbor)</a></li>
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<li><a href="/docs/latest/machine-learning/regression/introduction" class=''>Introduction</a></li>
<li><a href="/docs/latest/machine-learning/regression/linear-regression" class=''>Linear Regression</a></li>
<li><a href="/docs/latest/machine-learning/regression/decision-trees-regression" class=''>Decision Trees Regression</a></li>
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<li><a href="/docs/latest/machine-learning/clustering/introduction" class=''>Introduction</a></li>
<li><a href="/docs/latest/machine-learning/clustering/k-means-clustering" class=''>K-Means Clustering</a></li>
<li><a href="/docs/latest/machine-learning/clustering/gaussian-mixture" class=''>Gaussian mixture (GMM)</a></li>
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<li>
<a href="/docs/latest/machine-learning/preprocessing"
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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/split-the-dataset-on-test-and-train-datasets" class=''>Split the dataset on test and train datasets</a></li>
<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/multiclass-classification"
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<li><a href="/docs/latest/machine-learning/ensemble-methods/stacking" class=''>Stacking</a></li>
<li><a href="/docs/latest/machine-learning/ensemble-methods/baggin" class=''>Bagging</a></li>
<li><a href="/docs/latest/machine-learning/ensemble-methods/random-forest" class=''>Random Forest</a></li>
<li><a href="/docs/latest/machine-learning/ensemble-methods/gradient-boosting" class=''>Gradient Boosting</a></li>
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</li>
<li>
<a href="/docs/latest/machine-learning/recommendation-systems"
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>Recommendation Systems</a>
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<button
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<li><a href="/docs/latest/machine-learning/importing-model/introduction" class=''>Introduction</a></li>
<li><a href="/docs/latest/machine-learning/importing-model/model-import-from-gxboost" class=''>Import Model from XGBoost</a></li>
<li><a href="/docs/latest/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/latest/key-value-api/continuous-queries" class='' >Using Continuous Queries</a>
</li>
<li>
<a href="/docs/latest/services/services" class='' >Using Ignite Services</a>
</li>
<li>
<a href="/docs/latest/messaging" class='' >Using Ignite Messaging</a>
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<button type='button' class='group-toggle collapsed '>Distributed Data Structures<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
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<a href="/docs/latest/data-structures/queue-and-set"
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<li>
<a href="/docs/latest/data-structures/atomic-types"
class=''
>Atomic Types</a>
</li>
<li>
<a href="/docs/latest/data-structures/countdownlatch"
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>CountDownLatch</a>
</li>
<li>
<a href="/docs/latest/data-structures/atomic-sequence"
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>Atomic Sequence</a>
</li>
<li>
<a href="/docs/latest/data-structures/semaphore"
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>Semaphore</a>
</li>
<li>
<a href="/docs/latest/data-structures/id-generator"
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>ID Generator</a>
</li>
</nav>
</li>
<li>
<a href="/docs/latest/distributed-locks" class='' >Distributed Locks</a>
</li>
<li>
<a href="/docs/latest/restapi" class='' >REST API</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/net-specific/net-platform-interoperability.adoc" target="_blank">Edit</a>
<h1>Ignite.NET and Platform Interoperability</h1>
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>Ignite allows different platforms, such as .NET, Java and C&#43;&#43;, to interoperate with each other.
Classes and objects defined and written to Ignite by one platform can be read and used by another platform.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="identifiers">Identifiers</h2>
<div class="sectionbody">
<div class="paragraph">
<p>To achieve interoperability Ignite writes objects using the common binary format. This format encodes object type and
fields using integer identifiers.</p>
</div>
<div class="paragraph">
<p>To transform an object&#8217;s type and field names to an integer value, Ignite passes them through two stage:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Name transformation: full type name and field names are passed to <code>IBinaryNameMapper</code> interface and converted to some common form.</p>
</li>
<li>
<p>ID transformation: resulting strings are passed to <code>IBinaryIdMapper</code> to produce either type ID or field ID.</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>Mappers can be set either globally in <code>BinaryConfiguration</code> or for concrete type in <code>BinaryTypeConfiguration</code>.</p>
</div>
<div class="paragraph">
<p>Java has the same interfaces <code>BinaryNameMapper</code> and <code>BinaryIdMapper</code>. They are set on <code>BinaryConfiguration</code> or <code>BinaryTypeConfiguration</code>.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="default-behavior">Default Behavior</h2>
<div class="sectionbody">
<div class="paragraph">
<div class="title">NET and Java types must map to the same type ID and relevant fields must map to the same field ID.</div>
<p>The .NET part of Ignite.NET applies the following conversions by default:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Name transformation: the <code>System.Type.FullName</code> property for non-generics types; field or property name is unchanged.</p>
</li>
<li>
<p>ID transformation: names are converted to lower case and then ID is calculated in the same way as in the <code>java.lang.String.hashCode()</code> method in Java.</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>The Java part of Ignite.NET applies the following conversions by default:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Name transformation: the <code>Class.getName()</code> method to get class name; field name is unchanged.</p>
</li>
<li>
<p>ID transformation: names are converted to lower case and then <code>java.lang.String.hashCode()</code> is used to calculate IDs.</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>For example, the following two types will automatically map to each other, if they are outside namespaces (.NET) and packages (Java):</p>
</div>
<code-tabs><code-tab data-tab='C#'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="csharp"><span class="k">class</span> <span class="nc">Person</span>
<span class="p">{</span>
<span class="k">public</span> <span class="kt">int</span> <span class="n">Id</span> <span class="p">{</span> <span class="k">get</span><span class="p">;</span> <span class="k">set</span><span class="p">;</span> <span class="p">}</span>
<span class="k">public</span> <span class="kt">string</span> <span class="n">Name</span> <span class="p">{</span> <span class="k">get</span><span class="p">;</span> <span class="k">set</span><span class="p">;</span> <span class="p">}</span>
<span class="k">public</span> <span class="kt">byte</span><span class="p">[]</span> <span class="n">Data</span> <span class="p">{</span> <span class="k">get</span><span class="p">;</span> <span class="k">set</span><span class="p">;</span> <span class="p">}</span>
<span class="p">}</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="kd">class</span> <span class="nc">Person</span>
<span class="o">{</span>
<span class="kd">public</span> <span class="kt">int</span> <span class="n">id</span><span class="o">;</span>
<span class="kd">public</span> <span class="nc">String</span> <span class="n">name</span><span class="o">;</span>
<span class="kd">public</span> <span class="kt">byte</span><span class="o">[]</span> <span class="n">data</span><span class="o">;</span>
<span class="o">}</span></code></pre>
</div>
</div></code-tab></code-tabs>
<div class="paragraph">
<p>However, the types are normally within some namespace or package. And naming conventions for packages and namespaces
differ in Java and .NET. It may be problematic to have .NET namespace be the same as Java package.</p>
</div>
<div class="paragraph">
<p>Simple name mapper (which ignores namespace) can be used to avoid this problem. It should be configured both for .NET and Java:</p>
</div>
<code-tabs><code-tab data-tab='Java Spring XML'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="xml"><span class="nt">&lt;bean</span> <span class="na">id=</span><span class="s">"grid.cfg"</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">"binaryConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.BinaryConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"nameMapper"</span><span class="nt">&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.binary.BinaryBasicNameMapper"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"simpleName"</span> <span class="na">value=</span><span class="s">"true"</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>
<span class="nt">&lt;/property&gt;</span>
...
<span class="nt">&lt;/bean&gt;</span></code></pre>
</div>
</div></code-tab><code-tab data-tab='C#'><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">BinaryConfiguration</span> <span class="p">=</span> <span class="k">new</span> <span class="n">BinaryConfiguration</span>
<span class="p">{</span>
<span class="n">NameMapper</span> <span class="p">=</span> <span class="k">new</span> <span class="n">BinaryBasicNameMapper</span> <span class="p">{</span><span class="n">IsSimpleName</span> <span class="p">=</span> <span class="k">true</span><span class="p">}</span>
<span class="p">}</span>
<span class="p">}</span></code></pre>
</div>
</div></code-tab><code-tab data-tab='app.config'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="xml"><span class="nt">&lt;igniteConfiguration&gt;</span>
<span class="nt">&lt;binaryConfiguration&gt;</span>
<span class="nt">&lt;nameMapper</span> <span class="na">type=</span><span class="s">"Apache.Ignite.Core.Binary.BinaryBasicNameMapper, Apache.Ignite.Core"</span> <span class="na">isSimpleName=</span><span class="s">"true"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;/binaryConfiguration&gt;</span>
<span class="nt">&lt;/igniteConfiguration&gt;</span></code></pre>
</div>
</div></code-tab></code-tabs>
</div>
</div>
<div class="sect1">
<h2 id="types-compatibility">Types Compatibility</h2>
<div class="sectionbody">
<table class="tableblock frame-all grid-all stripes-even stretch">
<colgroup>
<col style="width: 25%;">
<col style="width: 75%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top"><code>C#</code></th>
<th class="tableblock halign-left valign-top"><code>Java</code></th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>bool</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>boolean</code></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>byte (*), sbyte</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>byte</code></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>short, ushort (*)</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>short</code></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>int, uint (*)</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>int</code></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>long, ulong (*)</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>long</code></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>char</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>char</code></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>float</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>float</code></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>double</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>double</code></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>decimal</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>java.math.BigDecimal (**)</code></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>string</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>java.lang.String</code></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>Guid</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>java.util.UUID</code></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>DateTime</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>java.util.Date, java.sql.Timestamp</code></p></td>
</tr>
</tbody>
</table>
<div class="paragraph">
<p><code>* byte, ushort, uint, ulong</code> do not have Java counterparts, and are mapped directly byte-by-byte (no range check).
For example, <code>byte</code> value of <code>200</code> in C# will result in signed <code>byte</code> value of <code>-56</code> in Java.</p>
</div>
<div class="paragraph">
<p><code>** Java BigDecimal</code> has arbitrary size and precision, while C# decimal is fixed to 16 bytes and 28-29 digit precision. Ignite.NET will throw <code>BinaryObjectException</code> if a <code>BigDecimal</code> value does not fit into <code>decimal</code> on deserialization.</p>
</div>
<div class="paragraph">
<p><code>Enum</code> - In Ignite, Java <code>writeEnum</code> can only write ordinal values, but in .NET you can assign any number to the <code>enumValue</code>.
So, note that any custom enum-to-primitive value bindings are not taken into account.</p>
</div>
<div class="admonitionblock caution">
<table>
<tr>
<td class="icon">
<div class="title">Caution</div>
</td>
<td class="content">
<h3 id="datetime-serialization" class="discrete">DateTime Serialization</h3>
<div class="paragraph">
<p>DateTime can be Local and UTC; Java Timestamp can only be UTC. Because of that, Ignite.NET can serialize DateTime in
following ways:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>.NET style (can work with non-UTC values, does not work in SQL) and as Timestamp (throws exception on non-UTC values, works properly in SQL).</p>
</li>
<li>
<p>Reflective serialization: mark field with <code>[QuerySqlField]</code> to enforce Timestamp serialization, or set <code>BinaryReflectiveSerializer.ForceTimestamp</code>
to true; this can be done on per-type basis, or globally like this:
<code>IgniteConfiguration.BinaryConfiguration = new BinaryConfiguration { Serializer = new BinaryReflectiveSerializer { ForceTimestamp = true } }</code></p>
</li>
<li>
<p><code>IBinarizable</code>: use IBinaryWriter.WriteTimestamp method.</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>When it is not possible to modify class to mark fields with <code>[QuerySqlField]</code> or implement <code>IBinarizable</code>, use the <code>IBinarySerializer</code> approach.
See <a href="/docs/latest/net-specific/net-serialization">Serialization page</a> for more details.</p>
</div>
</td>
</tr>
</table>
</div>
</div>
</div>
<div class="sect1">
<h2 id="collection-compatibility">Collection Compatibility</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Arrays of simple types (from the table above) and arrays of objects are interoperable in all cases. For all other collections
and arrays default behavior (with reflective serialization or <code>IBinaryWriter.WriteObject</code>) in Ignite.NET is to use <code>BinaryFormatter</code>,
and the result can not be read by Java code (this is done to properly support generics). To write collections in interoperable
format, implement 'IBinarizable' interface and use <code>IBinaryWriter.WriteCollection</code>, <code>IBinaryWriter.WriteDictionary</code>,
<code>IBinaryReader.ReadCollection</code>, `IBinaryReader.ReadDictionary`methods.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="mixed-platform-clusters">Mixed-Platform Clusters</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Ignite, Ignite.NET and Ignite.C&#43;&#43; nodes can join the same cluster</p>
</div>
<div class="paragraph">
<p>All platforms are built on top of Java, so any node can execute Java computations.
However, .NET and C&#43;&#43; computations can be executed only by corresponding nodes.</p>
</div>
<div class="paragraph">
<p>The following Ignite.NET functionality is not supported when there is at least one non-.NET node in the cluster:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Scan Queries with filter</p>
</li>
<li>
<p>Continuous Queries with filter</p>
</li>
<li>
<p>ICache.Invoke methods</p>
</li>
<li>
<p>ICache.LoadCache with filter</p>
</li>
<li>
<p>Services</p>
</li>
<li>
<p>IMessaging.RemoteListen</p>
</li>
<li>
<p>IEvents.RemoteQuery</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>Blog post with detailed walk-through: <a href="https://ptupitsyn.github.io/Ignite-Multi-Platform-Cluster/" target="_blank" rel="noopener">Multi-Platform Ignite Cluster: Java + .NET</a></p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="compute-in-mixed-platform-clusters">Compute in Mixed-Platform Clusters</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The <code>ICompute.ExecuteJavaTask</code> methods work without limitations in any cluster. Other <code>ICompute</code> methods will execute
closures only on .NET nodes.</p>
</div>
</div>
</div>
<div class="copyright">
© 2022 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>
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<li><a href="#identifiers">Identifiers</a></li>
<li><a href="#default-behavior">Default Behavior</a></li>
<li><a href="#types-compatibility">Types Compatibility</a></li>
<li><a href="#collection-compatibility">Collection Compatibility</a></li>
<li><a href="#mixed-platform-clusters">Mixed-Platform Clusters</a></li>
<li><a href="#compute-in-mixed-platform-clusters">Compute in Mixed-Platform Clusters</a></li>
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