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| <a href="/docs/latest/distributed-computing/executor-service" |
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| class='' |
| >Executor Service</a> |
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| <li> |
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| <a href="/docs/latest/distributed-computing/map-reduce" |
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| class='' |
| >MapReduce API</a> |
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| <li> |
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| <a href="/docs/latest/distributed-computing/load-balancing" |
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| class='' |
| >Load Balancing</a> |
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| <li> |
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| <a href="/docs/latest/distributed-computing/fault-tolerance" |
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| class='' |
| >Fault Tolerance</a> |
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| <li> |
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| <a href="/docs/latest/distributed-computing/job-scheduling" |
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| class='' |
| >Job Scheduling</a> |
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| <a href="/docs/latest/collocated-computations" class='' >Colocating Computations with Data</a> |
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| <a href="/docs/latest/events/listening-to-events" |
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| class='' |
| >Enabling and Listenting to Events</a> |
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| <li> |
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| <a href="/docs/latest/events/events" |
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| <a href="/docs/latest/platform-cache" class='' >.NET Platform Cache</a> |
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| >CountDownLatch</a> |
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| <li><a href="/docs/latest//machine-learning/regression/knn-regression" class=''>k-NN Regression</a></li> |
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| <li><a href="/docs/latest//machine-learning/clustering/introduction" class=''>Introduction</a></li> |
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| <li><a href="/docs/latest//machine-learning/clustering/k-means-clustering" class=''>K-Means Clustering</a></li> |
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| <li><a href="/docs/latest//machine-learning/clustering/gaussian-mixture" class=''>Gaussian mixture (GMM)</a></li> |
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| <li> |
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| <a href="/docs/latest/machine-learning/preprocessing" |
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| >Preprocessing</a> |
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| <li> |
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| <li><a href="/docs/latest//machine-learning/model-selection/introduction" class=''>Introduction</a></li> |
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| <li><a href="/docs/latest//machine-learning/model-selection/split-the-dataset-on-test-and-train-datasets" class=''>Split the dataset on test and train datasets</a></li> |
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| <li><a href="/docs/latest//machine-learning/model-selection/hyper-parameter-tuning" class=''>Hyper-parameter tuning</a></li> |
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| <li><a href="/docs/latest//machine-learning/model-selection/pipeline-api" class=''>Pipeline API</a></li> |
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| <li> |
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| <a href="/docs/latest/machine-learning/multiclass-classification" |
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| class='' |
| >Multiclass Classification</a> |
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| <li> |
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| <li><a href="/docs/latest//machine-learning/ensemble-methods/introduction" class=''></a></li> |
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| <li><a href="/docs/latest//machine-learning/ensemble-methods/baggin" class=''>Bagging</a></li> |
| |
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| <li><a href="/docs/latest//machine-learning/ensemble-methods/random-forest" class=''>Random Forest</a></li> |
| |
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| <li><a href="/docs/latest//machine-learning/ensemble-methods/gradient-boosting" class=''>Gradient Boosting</a></li> |
| |
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| <li> |
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| <a href="/docs/latest/machine-learning/recommendation-systems" |
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| class='' |
| >Recommendation Systems</a> |
| |
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| |
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| <li> |
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| <button |
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| <li><a href="/docs/latest//machine-learning/importing-model/introduction" class=''>Introduction</a></li> |
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| <li><a href="/docs/latest//machine-learning/importing-model/model-import-from-gxboost" class=''>Import Model from XGBoost</a></li> |
| |
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| <li><a href="/docs/latest//machine-learning/importing-model/model-import-from-apache-spark" class=''>Import Model from Apache Spark</a></li> |
| |
| </nav> |
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| </nav> |
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| <a href="/docs/latest/monitoring-metrics/intro" |
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| >Introduction</a> |
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| <li> |
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| <a href="/docs/latest/monitoring-metrics/cluster-id" |
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| <li><a href="/docs/latest//monitoring-metrics/configuring-metrics" class=''>Configuring Metrics</a></li> |
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| <li><a href="/docs/latest//monitoring-metrics/metrics" class=''>JMX Metrics</a></li> |
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| <li><a href="/docs/latest//security/tde" class=''>Introduction</a></li> |
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| <a href="/docs/latest/thin-clients/cpp-thin-client" |
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| >C++ Thin Client</a> |
| |
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| <li> |
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| <a href="/docs/latest/thin-clients/python-thin-client" |
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| class='' |
| >Python Thin Client</a> |
| |
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| <li> |
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| <a href="/docs/latest/thin-clients/php-thin-client" |
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| >PHP Thin Client</a> |
| |
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| <a href="/docs/latest/thin-clients/nodejs-thin-client" |
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| class='' |
| >Node.js Thin Client</a> |
| |
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| |
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| <li><a href="/docs/latest//binary-client-protocol/binary-client-protocol" class=''>Binary Client Protocol</a></li> |
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| |
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| <li><a href="/docs/latest//binary-client-protocol/sql-and-scan-queries" class=''>SQL and Scan Queries</a></li> |
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| <li><a href="/docs/latest//binary-client-protocol/binary-type-metadata" class=''>Binary Types Metadata</a></li> |
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| <li><a href="/docs/latest//binary-client-protocol/cache-configuration" class=''>Cache Configuration</a></li> |
| |
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| <li> |
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| <a href="/docs/latest/SQL/ODBC/odbc-driver" |
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| class='' |
| >ODBC Driver</a> |
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| |
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| <li> |
| |
| <a href="/docs/latest/SQL/ODBC/connection-string-dsn" |
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| class='' |
| >Connection String and DSN</a> |
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| |
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| <li> |
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| <a href="/docs/latest/SQL/ODBC/querying-modifying-data" |
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| class='' |
| >Querying and Modifying Data</a> |
| |
| </li> |
| |
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| <li> |
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| <a href="/docs/latest/SQL/ODBC/specification" |
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| class='' |
| >Specification</a> |
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| </li> |
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| |
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| <li> |
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| <a href="/docs/latest/SQL/ODBC/data-types" |
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| class='' |
| >Data Types</a> |
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| </li> |
| |
| |
| |
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| |
| <li> |
| |
| <a href="/docs/latest/SQL/ODBC/error-codes" |
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| class='' |
| >Error Codes</a> |
| |
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| |
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| <li> |
| |
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| <a href="/docs/latest/restapi" class='' >REST API</a> |
| |
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| <a href="/docs/latest/control-script" class='' >Control Script</a> |
| |
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| <a href="/docs/latest/plugins" class='' >Plugins</a> |
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| |
| <a href="/docs/latest/sqlline" class='' >SQLLine</a> |
| |
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| <button type='button' data-guide-url="" class='group-toggle collapsed '>Ignite for Spark<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
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| <li> |
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| <a href="/docs/latest/ignite-for-spark/overview" |
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| class='' |
| >Overview</a> |
| |
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| |
| <li> |
| |
| <a href="/docs/latest/ignite-for-spark/ignitecontext-and-rdd" |
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| class='' |
| >IgniteContext and IgniteRDD</a> |
| |
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| <article data-swiftype-index='true'> |
| <a class='edit-link' href="https://github.com/apache/ignite/tree/IGNITE-7595/docs/_docs/data-structures/atomic-types.adoc" target="_blank">Edit</a> |
| |
| <h1>Atomic Types</h1> |
| |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Ignite supports distributed atomic long and atomic reference, similar to <code>java.util.concurrent.atomic.AtomicLong</code> and <code>java.util.concurrent.atomic.AtomicReference</code> respectively.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Atomics in Ignite are distributed across the cluster, essentially enabling performing atomic operations (such as increment-and-get or compare-and-set) with the same globally-visible value. For example, you could update the value of an atomic long on one node and read it from another node.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Features:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Retrieve current value.</p> |
| </li> |
| <li> |
| <p>Atomically modify current value.</p> |
| </li> |
| <li> |
| <p>Atomically increment or decrement current value.</p> |
| </li> |
| <li> |
| <p>Atomically compare-and-set the current value to new value.</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>Distributed atomic long and atomic reference can be obtained via <code>IgniteAtomicLong</code> and <code>IgniteAtomicReference</code> interfaces respectively, as shown below:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="title">AtomicLong:</div> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="java"><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="nc">IgniteAtomicLong</span> <span class="n">atomicLong</span> <span class="o">=</span> <span class="n">ignite</span><span class="o">.</span><span class="na">atomicLong</span><span class="o">(</span><span class="s">"atomicName"</span><span class="o">,</span> <span class="c1">// Atomic long name.</span> |
| <span class="mi">0</span><span class="o">,</span> <span class="c1">// Initial value.</span> |
| <span class="kc">true</span> <span class="c1">// Create if it does not exist.</span> |
| <span class="o">);</span> |
| |
| <span class="c1">// Increment atomic long on local node</span> |
| <span class="nc">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="s">"Incremented value: "</span> <span class="o">+</span> <span class="n">atomicLong</span><span class="o">.</span><span class="na">incrementAndGet</span><span class="o">());</span></code></pre> |
| </div> |
| </div> |
| <div class="listingblock"> |
| <div class="title">AtomicReference:</div> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="java"><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="c1">// Create an AtomicReference</span> |
| <span class="nc">IgniteAtomicReference</span><span class="o"><</span><span class="nc">String</span><span class="o">></span> <span class="n">ref</span> <span class="o">=</span> <span class="n">ignite</span><span class="o">.</span><span class="na">atomicReference</span><span class="o">(</span><span class="s">"refName"</span><span class="o">,</span> <span class="c1">// Reference name.</span> |
| <span class="s">"someVal"</span><span class="o">,</span> <span class="c1">// Initial value for atomic reference.</span> |
| <span class="kc">true</span> <span class="c1">// Create if it does not exist.</span> |
| <span class="o">);</span> |
| |
| <span class="c1">// Compare and update the value</span> |
| <span class="n">ref</span><span class="o">.</span><span class="na">compareAndSet</span><span class="o">(</span><span class="s">"WRONG EXPECTED VALUE"</span><span class="o">,</span> <span class="s">"someNewVal"</span><span class="o">);</span> <span class="c1">// Won't change.</span></code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>All atomic operations provided by <code>IgniteAtomicLong</code> and <code>IgniteAtomicReference</code> are synchronous. The time an atomic operation will take depends on the number of nodes performing concurrent operations with the same instance of atomic long, the intensity of these operations, and network latency.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="atomic-configuration">Atomic Configuration</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Atomics in Ignite can be configured via the <code>atomicConfiguration</code> property of <code>IgniteConfiguration</code>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The following table lists available configuration parameters:</p> |
| </div> |
| <table class="tableblock frame-all grid-all stripes-even stretch"> |
| <colgroup> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3334%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Setter</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| <th class="tableblock halign-left valign-top">Default</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>setBackups(int)</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">The number of backups.</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">0</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>setCacheMode(CacheMode)</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Cache mode for all atomic types.</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>PARTITIONED</code></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>setAtomicSequenceReserveSize(int)</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Sets the number of sequence values reserved for <code>IgniteAtomicSequence</code> instances.</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">1000</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="copyright"> |
| © 2020 The Apache Software Foundation.<br/> |
| Apache, Apache Ignite, the Apache feather and the Apache Ignite logo are either registered trademarks or trademarks of The Apache Software Foundation. |
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