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SteKoe committed Jul 21, 2024
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<div class="sect1">
<h2 id="clustering-support">Clustering</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Spring Boot Admin Server supports cluster replication via Hazelcast. It is automatically enabled when a <code>HazelcastConfig</code>- or <code>HazelcastInstance</code>-Bean is present. You can also configure the Hazelcast instance to be persistent, to keep the status over restarts. Also have a look at the <a href="http://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/htmlsingle/#boot-features-hazelcast/">Spring Boot support for Hazelcast</a>.</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li><p>Add Hazelcast to your dependencies:</p>
<div class="listingblock">
<div class="title">
pom.xml
</div>
<div class="content">
<pre class="CodeRay highlight border shadow rounded"><code data-lang="xml"><span class="tag">&lt;dependency&gt;</span>
<span class="tag">&lt;groupId&gt;</span>com.hazelcast<span class="tag">&lt;/groupId&gt;</span>
<span class="tag">&lt;artifactId&gt;</span>hazelcast<span class="tag">&lt;/artifactId&gt;</span>
<span class="tag">&lt;/dependency&gt;</span></code></pre>
</div>
</div></li>
<li><p>Instantiate a HazelcastConfig:</p>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight border shadow rounded"><code data-lang="java"><span class="annotation">@Bean</span>
<span class="directive">public</span> Config hazelcastConfig() {
<span class="comment">// This map is used to store the events.</span>
<span class="comment">// It should be configured to reliably hold all the data,</span>
<span class="comment">// Spring Boot Admin will compact the events, if there are too many</span>
MapConfig eventStoreMap = <span class="keyword">new</span> MapConfig(DEFAULT_NAME_EVENT_STORE_MAP).setInMemoryFormat(InMemoryFormat.OBJECT)
.setBackupCount(<span class="integer">1</span>)
.setMergePolicyConfig(<span class="keyword">new</span> MergePolicyConfig(PutIfAbsentMergePolicy.class.getName(), <span class="integer">100</span>));

<span class="comment">// This map is used to deduplicate the notifications.</span>
<span class="comment">// If data in this map gets lost it should not be a big issue as it will atmost</span>
<span class="comment">// lead to</span>
<span class="comment">// the same notification to be sent by multiple instances</span>
MapConfig sentNotificationsMap = <span class="keyword">new</span> MapConfig(DEFAULT_NAME_SENT_NOTIFICATIONS_MAP)
.setInMemoryFormat(InMemoryFormat.OBJECT)
.setBackupCount(<span class="integer">1</span>)
.setEvictionConfig(
<span class="keyword">new</span> EvictionConfig().setEvictionPolicy(EvictionPolicy.LRU).setMaxSizePolicy(MaxSizePolicy.PER_NODE))
.setMergePolicyConfig(<span class="keyword">new</span> MergePolicyConfig(PutIfAbsentMergePolicy.class.getName(), <span class="integer">100</span>));

Config config = <span class="keyword">new</span> Config();
config.addMapConfig(eventStoreMap);
config.addMapConfig(sentNotificationsMap);
config.setProperty(<span class="string"><span class="delimiter">"</span><span class="content">hazelcast.jmx</span><span class="delimiter">"</span></span>, <span class="string"><span class="delimiter">"</span><span class="content">true</span><span class="delimiter">"</span></span>);

<span class="comment">// WARNING: This setups a local cluster, you change it to fit your needs.</span>
config.getNetworkConfig().getJoin().getMulticastConfig().setEnabled(<span class="predefined-constant">false</span>);
TcpIpConfig tcpIpConfig = config.getNetworkConfig().getJoin().getTcpIpConfig();
tcpIpConfig.setEnabled(<span class="predefined-constant">true</span>);
tcpIpConfig.setMembers(singletonList(<span class="string"><span class="delimiter">"</span><span class="content">127.0.0.1</span><span class="delimiter">"</span></span>));
<span class="keyword">return</span> config;
}</code></pre>
</div>
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</div>
<table class="tableblock frame-all grid-all stretch table table-striped table-bordered">
<caption class="title">
Table 1. Hazelcast configuration options
</caption>
<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">Property name</th>
<th class="tableblock halign-left valign-top">Description</th>
<th class="tableblock halign-left valign-top">Default value</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">spring.boot.admin.hazelcast.enabled</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Enables the Hazelcast support</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>true</code></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">spring.boot.admin.hazelcast.event-store</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Name of the Hazelcast-map to store the events</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>"spring-boot-admin-event-store"</code></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">spring.boot.admin.hazelcast.sent-notifications</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Name of the Hazelcast-map used to deduplicate the notifications.</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>"spring-boot-admin-sent-notifications"</code></p></td>
</tr>
</tbody>
</table>
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