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| <a href="/docs/2.9.0/distributed-computing/load-balancing" |
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| <a href="/docs/2.9.0/distributed-computing/fault-tolerance" |
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| >Fault Tolerance</a> |
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| <a href="/docs/2.9.0/distributed-computing/job-scheduling" |
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| <a href="/docs/2.9.0/platform-cache" class='' >.NET Platform Cache</a> |
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| <li><a href="/docs/2.9.0//machine-learning/regression/introduction" class=''>Introduction</a></li> |
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| <li><a href="/docs/2.9.0//machine-learning/model-selection/introduction" class=''>Introduction</a></li> |
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| <li><a href="/docs/2.9.0//machine-learning/ensemble-methods/stacking" class=''>Stacking</a></li> |
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| <li><a href="/docs/2.9.0//machine-learning/ensemble-methods/baggin" class=''>Bagging</a></li> |
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| <li><a href="/docs/2.9.0//machine-learning/ensemble-methods/random-forest" class=''>Random Forest</a></li> |
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| <li><a href="/docs/2.9.0//machine-learning/ensemble-methods/gradient-boosting" class=''>Gradient Boosting</a></li> |
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| <a href="/docs/2.9.0/monitoring-metrics/cluster-id" |
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| <li><a href="/docs/2.9.0//security/tde" class=''>Introduction</a></li> |
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| >Thin Clients Overview</a> |
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| <a href="/docs/2.9.0/thin-clients/java-thin-client" |
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| >Java Thin Client</a> |
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| <a href="/docs/2.9.0/thin-clients/dotnet-thin-client" |
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| >.NET Thin Client</a> |
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| <li> |
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| <a href="/docs/2.9.0/thin-clients/cpp-thin-client" |
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| class='' |
| >C++ Thin Client</a> |
| |
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| <li> |
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| <a href="/docs/2.9.0/thin-clients/python-thin-client" |
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| class='' |
| >Python Thin Client</a> |
| |
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| <a href="/docs/2.9.0/thin-clients/php-thin-client" |
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| class='' |
| >PHP Thin Client</a> |
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| <a href="/docs/2.9.0/thin-clients/nodejs-thin-client" |
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| <li><a href="/docs/2.9.0//binary-client-protocol/binary-client-protocol" class=''>Binary Client Protocol</a></li> |
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| <li><a href="/docs/2.9.0//binary-client-protocol/data-format" class=''>Data Format</a></li> |
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| <li><a href="/docs/2.9.0//binary-client-protocol/key-value-queries" class=''>Key-Value Queries</a></li> |
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| |
| <li><a href="/docs/2.9.0//binary-client-protocol/sql-and-scan-queries" class=''>SQL and Scan Queries</a></li> |
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| <li><a href="/docs/2.9.0//binary-client-protocol/binary-type-metadata" class=''>Binary Types Metadata</a></li> |
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| <li><a href="/docs/2.9.0//binary-client-protocol/cache-configuration" class=''>Cache Configuration</a></li> |
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| </nav> |
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| <button type='button' data-guide-url="" class='group-toggle collapsed '>ODBC Driver<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
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| <a href="/docs/2.9.0/SQL/ODBC/odbc-driver" |
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| class='' |
| >ODBC Driver</a> |
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| <a href="/docs/2.9.0/SQL/ODBC/connection-string-dsn" |
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| class='' |
| >Connection String and DSN</a> |
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| <li> |
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| <a href="/docs/2.9.0/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/2.9.0/SQL/ODBC/specification" |
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| class='' |
| >Specification</a> |
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| </li> |
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| <li> |
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| <a href="/docs/2.9.0/SQL/ODBC/data-types" |
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| class='' |
| >Data Types</a> |
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| </li> |
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| <li> |
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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/queue-and-set.adoc" target="_blank">Edit</a> |
| |
| <h1>Queue and Set</h1> |
| |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>In addition to providing standard key-value map-like storage, Ignite also provides an implementation of a fast Distributed Blocking Queue and Distributed Set.</p> |
| </div> |
| <div class="paragraph"> |
| <p><code>IgniteQueue</code> and <code>IgniteSet</code>, an implementation of <code>java.util.concurrent.BlockingQueue</code> and <code>java.util.Set</code> interface respectively, also support all operations from the <code>java.util.Collection</code> interface. |
| Both types can be created in either collocated or non-collocated mode.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Below is an example of how to create a distributed queue and set.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="title">Queue:</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">IgniteQueue</span><span class="o"><</span><span class="nc">String</span><span class="o">></span> <span class="n">queue</span> <span class="o">=</span> <span class="n">ignite</span><span class="o">.</span><span class="na">queue</span><span class="o">(</span><span class="s">"queueName"</span><span class="o">,</span> <span class="c1">// Queue name.</span> |
| <span class="mi">0</span><span class="o">,</span> <span class="c1">// Queue capacity. 0 for an unbounded queue.</span> |
| <span class="k">new</span> <span class="nf">CollectionConfiguration</span><span class="o">()</span> <span class="c1">// Collection configuration.</span> |
| <span class="o">);</span></code></pre> |
| </div> |
| </div> |
| <div class="listingblock"> |
| <div class="title">Set:</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">IgniteSet</span><span class="o"><</span><span class="nc">String</span><span class="o">></span> <span class="n">set</span> <span class="o">=</span> <span class="n">ignite</span><span class="o">.</span><span class="na">set</span><span class="o">(</span><span class="s">"setName"</span><span class="o">,</span> <span class="c1">// Set name.</span> |
| <span class="k">new</span> <span class="nf">CollectionConfiguration</span><span class="o">()</span> <span class="c1">// Collection configuration.</span> |
| <span class="o">);</span></code></pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="collocated-vs-non-collocated-mode">Collocated vs. Non-Collocated Mode</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>If you plan to create just a few queues or sets containing lots of data, then you would create them in non-collocated mode. This will make sure that about equal portion of each queue or set will be stored on each cluster node. On the other hand, if you plan to have many queues or sets, relatively small in size (compared to the whole cache), then you would most likely create them in collocated mode. In this mode all queue or set elements will be stored on the same cluster node, but about equal amount of queues/sets will be assigned to every node.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Non-collocated mode only makes sense for and is only supported for <code>PARTITIONED</code> caches.</p> |
| </div> |
| <div class="paragraph"> |
| <p>A collocated queue and set can be created by setting the <code>collocated</code> property of <code>CollectionConfiguration</code>, like so:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="title">Queue:</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">CollectionConfiguration</span> <span class="n">colCfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">CollectionConfiguration</span><span class="o">();</span> |
| |
| <span class="n">colCfg</span><span class="o">.</span><span class="na">setCollocated</span><span class="o">(</span><span class="kc">true</span><span class="o">);</span> |
| |
| <span class="c1">// Create a colocated queue.</span> |
| <span class="nc">IgniteQueue</span><span class="o"><</span><span class="nc">String</span><span class="o">></span> <span class="n">queue</span> <span class="o">=</span> <span class="n">ignite</span><span class="o">.</span><span class="na">queue</span><span class="o">(</span><span class="s">"queueName"</span><span class="o">,</span> <span class="mi">0</span><span class="o">,</span> <span class="n">colCfg</span><span class="o">);</span></code></pre> |
| </div> |
| </div> |
| <div class="listingblock"> |
| <div class="title">Set:</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">CollectionConfiguration</span> <span class="n">colCfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">CollectionConfiguration</span><span class="o">();</span> |
| |
| <span class="n">colCfg</span><span class="o">.</span><span class="na">setCollocated</span><span class="o">(</span><span class="kc">true</span><span class="o">);</span> |
| |
| <span class="c1">// Create a colocated set.</span> |
| <span class="nc">IgniteSet</span><span class="o"><</span><span class="nc">String</span><span class="o">></span> <span class="n">set</span> <span class="o">=</span> <span class="n">ignite</span><span class="o">.</span><span class="na">set</span><span class="o">(</span><span class="s">"setName"</span><span class="o">,</span> <span class="n">colCfg</span><span class="o">);</span></code></pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="cache-queues-and-load-balancing">Cache Queues and Load Balancing</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Given that elements will remain in the queue until someone takes them, and that no two nodes should ever receive the same element from the queue, cache queues can be used as an alternate work distribution and load balancing approach within Ignite.</p> |
| </div> |
| <div class="paragraph"> |
| <p>For example, you could simply add computations, such as instances of <code>IgniteRunnable</code> to a queue, and have threads on remote nodes call <code>IgniteQueue.take()</code> method which will block if queue is empty. Once the <code>take()</code> method will return a job, a thread will process it and call <code>take()</code> again to get the next job. Given this approach, threads on remote nodes will only start working on the next job when they have completed the previous one, hence creating ideally balanced system where every node only takes the number of jobs it can process, and not more.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="collection-configuration">Collection Configuration</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Ignite collections can be in configured in API via <code>CollectionConfiguration</code> (see above examples). The following configuration parameters can be used:</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>setCollocated(boolean)</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Sets collocation mode.</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>false</code></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">Sets underlying cache mode (<code>PARTITIONED</code>, <code>REPLICATED</code> or <code>LOCAL</code>).</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>setAtomicityMode(CacheAtomicityMode)</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Sets underlying cache atomicity mode (<code>ATOMIC</code> or <code>TRANSACTIONAL</code>).</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>ATOMIC</code></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>setOffHeapMaxMemory(long)</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Sets offheap maximum memory size.</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>0</code> (unlimited)</p></td> |
| </tr> |
| <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">Sets number of backups.</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>0</code></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>setNodeFilter(IgnitePredicate<ClusterNode>)</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Sets optional predicate specifying on which nodes entries should be stored.</p></td> |
| <td class="tableblock halign-left valign-top"></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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| <li><a href="#collocated-vs-non-collocated-mode">Collocated vs. Non-Collocated Mode</a></li> |
| <li><a href="#cache-queues-and-load-balancing">Cache Queues and Load Balancing</a></li> |
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