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<div class="subTitle">org.apache.ignite.cluster</div>
<h2 title="Interface ClusterGroup" class="title">Interface ClusterGroup</h2>
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<pre>public interface <span class="typeNameLabel">ClusterGroup</span></pre>
<div class="block">Defines a cluster group which contains all or a subset of cluster nodes.
The <a href="../../../../org/apache/ignite/IgniteCluster.html" title="interface in org.apache.ignite"><code>IgniteCluster</code></a> interface itself also extends <code>ClusterGroup</code> which makes
an instance of <a href="../../../../org/apache/ignite/IgniteCluster.html" title="interface in org.apache.ignite"><code>IgniteCluster</code></a> into a cluster group containing all cluster nodes.
<h1 class="header">Clustering</h1>
Cluster group allows to group cluster nodes into various subgroups to perform distributed
operations on them. All <code>'forXXX(...)'</code> methods will create a child cluster group
from the existing cluster group. If you create a new cluster group from the current one, then
the resulting cluster group will include a subset of nodes from the current one. The following
code shows how to create and nest cluster groups:
<pre name="code" class="java">
Ignite ignite = Ignition.ignite();
IgniteCluster cluster = ignite.cluster();
// Cluster group over remote nodes.
ClusterGroup remoteNodes = cluster.forRemotes();
// Cluster group over random remote node.
ClusterGroup randomNode = remoteNodes.forRandom();
// Cluster group over all nodes with cache named "myCache" enabled.
ClusterGroup cacheNodes = cluster.forCacheNodes("myCache");
// Cluster group over all nodes that have the user attribute "group" set to the value "worker".
ClusterGroup workerNodes = cluster.forAttribute("group", "worker");
</pre></div>
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<h3>Method Summary</h3>
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html" title="interface in org.apache.ignite.cluster">ClusterGroup</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html#forAttribute-java.lang.String-java.lang.Object-">forAttribute</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;name,
@Nullable <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;val)</code>
<div class="block">Creates a new cluster group for nodes containing given name and value
specified in user attributes.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html" title="interface in org.apache.ignite.cluster">ClusterGroup</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html#forCacheNodes-java.lang.String-">forCacheNodes</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;cacheName)</code>
<div class="block">Creates a cluster group for all nodes that have cache with specified name, either in client or server modes.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html" title="interface in org.apache.ignite.cluster">ClusterGroup</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html#forClientNodes-java.lang.String-">forClientNodes</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;cacheName)</code>
<div class="block">Creates a cluster group for all client nodes that access cache with the specified name.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html" title="interface in org.apache.ignite.cluster">ClusterGroup</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html#forClients--">forClients</a></span>()</code>
<div class="block">Creates a cluster group of nodes started in client mode.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html" title="interface in org.apache.ignite.cluster">ClusterGroup</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html#forDaemons--">forDaemons</a></span>()</code>
<div class="block">Gets a cluster group consisting from the daemon nodes.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html" title="interface in org.apache.ignite.cluster">ClusterGroup</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html#forDataNodes-java.lang.String-">forDataNodes</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;cacheName)</code>
<div class="block">Creates a cluster group for all data nodes that have the cache with the specified name running.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html" title="interface in org.apache.ignite.cluster">ClusterGroup</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html#forHost-org.apache.ignite.cluster.ClusterNode-">forHost</a></span>(<a href="../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a>&nbsp;node)</code>
<div class="block">Gets cluster group consisting from the nodes in this cluster group residing on the
same host as the given node.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html" title="interface in org.apache.ignite.cluster">ClusterGroup</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html#forHost-java.lang.String-java.lang.String...-">forHost</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;host,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>...&nbsp;hosts)</code>
<div class="block">Gets cluster group consisting from the nodes running on the hosts specified.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html" title="interface in org.apache.ignite.cluster">ClusterGroup</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html#forNode-org.apache.ignite.cluster.ClusterNode-org.apache.ignite.cluster.ClusterNode...-">forNode</a></span>(<a href="../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a>&nbsp;node,
<a href="../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a>...&nbsp;nodes)</code>
<div class="block">Creates a cluster group for the given node.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html" title="interface in org.apache.ignite.cluster">ClusterGroup</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html#forNodeId-java.util.UUID-java.util.UUID...-">forNodeId</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/UUID.html?is-external=true" title="class or interface in java.util">UUID</a>&nbsp;id,
<a href="https://docs.oracle.com/javase/8/docs/api/java/util/UUID.html?is-external=true" title="class or interface in java.util">UUID</a>...&nbsp;ids)</code>
<div class="block">Creates a cluster group for a node with the specified ID.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html" title="interface in org.apache.ignite.cluster">ClusterGroup</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html#forNodeIds-java.util.Collection-">forNodeIds</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><span class='angle_bracket'>&lt;</span><a href="https://docs.oracle.com/javase/8/docs/api/java/util/UUID.html?is-external=true" title="class or interface in java.util">UUID</a><span class='angle_bracket'>&gt;</span>&nbsp;ids)</code>
<div class="block">Creates a cluster group over nodes with specified node IDs.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html" title="interface in org.apache.ignite.cluster">ClusterGroup</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html#forNodes-java.util.Collection-">forNodes</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><span class='angle_bracket'>&lt;</span>? extends <a href="../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a><span class='angle_bracket'>&gt;</span>&nbsp;nodes)</code>
<div class="block">Creates a cluster group over a given set of nodes.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html" title="interface in org.apache.ignite.cluster">ClusterGroup</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html#forOldest--">forOldest</a></span>()</code>
<div class="block">Creates a cluster group with one oldest node from the current cluster group.</div>
</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html" title="interface in org.apache.ignite.cluster">ClusterGroup</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html#forOthers-org.apache.ignite.cluster.ClusterGroup-">forOthers</a></span>(<a href="../../../../org/apache/ignite/cluster/ClusterGroup.html" title="interface in org.apache.ignite.cluster">ClusterGroup</a>&nbsp;prj)</code>
<div class="block">Creates a cluster group for nodes not included into the given cluster group.</div>
</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html" title="interface in org.apache.ignite.cluster">ClusterGroup</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html#forOthers-org.apache.ignite.cluster.ClusterNode-org.apache.ignite.cluster.ClusterNode...-">forOthers</a></span>(<a href="../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a>&nbsp;node,
<a href="../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a>...&nbsp;nodes)</code>
<div class="block">Creates a cluster group for nodes other than the given nodes.</div>
</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html" title="interface in org.apache.ignite.cluster">ClusterGroup</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html#forPredicate-org.apache.ignite.lang.IgnitePredicate-">forPredicate</a></span>(<a href="../../../../org/apache/ignite/lang/IgnitePredicate.html" title="interface in org.apache.ignite.lang">IgnitePredicate</a><span class='angle_bracket'>&lt;</span><a href="../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a><span class='angle_bracket'>&gt;</span>&nbsp;p)</code>
<div class="block">Creates a new cluster group which includes all nodes that pass the given predicate filter.</div>
</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html" title="interface in org.apache.ignite.cluster">ClusterGroup</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html#forRandom--">forRandom</a></span>()</code>
<div class="block">Creates a cluster group with one random node from the current cluster group.</div>
</td>
</tr>
<tr id="i17" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html" title="interface in org.apache.ignite.cluster">ClusterGroup</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html#forRemotes--">forRemotes</a></span>()</code>
<div class="block">Gets cluster group consisting from the nodes in this cluster group excluding the local node.</div>
</td>
</tr>
<tr id="i18" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html" title="interface in org.apache.ignite.cluster">ClusterGroup</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html#forServers--">forServers</a></span>()</code>
<div class="block">Creates a cluster group of nodes started in server mode.</div>
</td>
</tr>
<tr id="i19" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html" title="interface in org.apache.ignite.cluster">ClusterGroup</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html#forYoungest--">forYoungest</a></span>()</code>
<div class="block">Creates a cluster group with one youngest node in the current cluster group.</div>
</td>
</tr>
<tr id="i20" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><span class='angle_bracket'>&lt;</span><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a><span class='angle_bracket'>&gt;</span></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html#hostNames--">hostNames</a></span>()</code>
<div class="block">Gets the read-only collection of hostnames in this cluster group.</div>
</td>
</tr>
<tr id="i21" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/ignite/Ignite.html" title="interface in org.apache.ignite">Ignite</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html#ignite--">ignite</a></span>()</code>
<div class="block">Gets instance of grid.</div>
</td>
</tr>
<tr id="i22" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/ignite/cluster/ClusterMetrics.html" title="interface in org.apache.ignite.cluster">ClusterMetrics</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html#metrics--">metrics</a></span>()</code>
<div class="block">Gets a metrics snapshot for this cluster group.</div>
</td>
</tr>
<tr id="i23" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html#node--">node</a></span>()</code>
<div class="block">Gets first node from the list of nodes in this cluster group.</div>
</td>
</tr>
<tr id="i24" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html#node-java.util.UUID-">node</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/UUID.html?is-external=true" title="class or interface in java.util">UUID</a>&nbsp;nid)</code>
<div class="block">Gets a node for given ID from this cluster group.</div>
</td>
</tr>
<tr id="i25" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><span class='angle_bracket'>&lt;</span><a href="../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a><span class='angle_bracket'>&gt;</span></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html#nodes--">nodes</a></span>()</code>
<div class="block">Gets the read-only collection of nodes in this cluster group.</div>
</td>
</tr>
<tr id="i26" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/ignite/lang/IgnitePredicate.html" title="interface in org.apache.ignite.lang">IgnitePredicate</a><span class='angle_bracket'>&lt;</span><a href="../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a><span class='angle_bracket'>&gt;</span></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html#predicate--">predicate</a></span>()</code>
<div class="block">Gets predicate that defines a subset of nodes for this cluster group.</div>
</td>
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<h4>ignite</h4>
<pre><a href="../../../../org/apache/ignite/Ignite.html" title="interface in org.apache.ignite">Ignite</a>&nbsp;ignite()</pre>
<div class="block">Gets instance of grid.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Grid instance.</dd>
</dl>
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<div class="block">Creates a cluster group over a given set of nodes.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>nodes</code> - Collection of nodes to create the cluster group from.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Cluster group for the provided grid nodes.</dd>
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<div class="block">Creates a cluster group for the given node.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>node</code> - Node to create cluster group for.</dd>
<dd><code>nodes</code> - Optional additional nodes to include into the cluster group.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Cluster group for the given nodes.</dd>
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<a href="../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a>...&nbsp;nodes)</pre>
<div class="block">Creates a cluster group for nodes other than the given nodes.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>node</code> - Node to exclude from the new cluster group.</dd>
<dd><code>nodes</code> - Optional additional nodes to exclude from the cluster group.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Cluster group that will contain all nodes from the original cluster group excluding
the given nodes.</dd>
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<div class="block">Creates a cluster group for nodes not included into the given cluster group.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>prj</code> - Cluster group to exclude from the new cluster group.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Cluster group for nodes not included into the given cluster group.</dd>
</dl>
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<div class="block">Creates a cluster group over nodes with specified node IDs.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>ids</code> - Collection of node IDs.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Cluster group over nodes with the specified node IDs.</dd>
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<div class="block">Creates a cluster group for a node with the specified ID.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>id</code> - Node ID to get the cluster group for.</dd>
<dd><code>ids</code> - Optional additional node IDs to include into the cluster group.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Cluster group over the node with the specified node IDs.</dd>
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<div class="block">Creates a new cluster group which includes all nodes that pass the given predicate filter.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>p</code> - Predicate filter for nodes to include into the cluster group.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Cluster group for nodes that passed the predicate filter.</dd>
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<pre><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html" title="interface in org.apache.ignite.cluster">ClusterGroup</a>&nbsp;forAttribute(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;name,
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@Nullable <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;val)</pre>
<div class="block">Creates a new cluster group for nodes containing given name and value
specified in user attributes.
<p>
User attributes for every node are optional and can be specified in
grid node configuration. See <a href="../../../../org/apache/ignite/configuration/IgniteConfiguration.html#getUserAttributes--"><code>IgniteConfiguration.getUserAttributes()</code></a>
for more information.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>name</code> - Name of the attribute.</dd>
<dd><code>val</code> - Optional attribute value to match.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Cluster group for nodes containing specified attribute.</dd>
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<pre><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html" title="interface in org.apache.ignite.cluster">ClusterGroup</a>&nbsp;forServers()</pre>
<div class="block">Creates a cluster group of nodes started in server mode.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Cluster group of nodes started in server mode.</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../org/apache/ignite/Ignition.html#setClientMode-boolean-"><code>Ignition.setClientMode(boolean)</code></a>,
<a href="../../../../org/apache/ignite/configuration/IgniteConfiguration.html#setClientMode-boolean-"><code>IgniteConfiguration.setClientMode(boolean)</code></a></dd>
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<pre><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html" title="interface in org.apache.ignite.cluster">ClusterGroup</a>&nbsp;forClients()</pre>
<div class="block">Creates a cluster group of nodes started in client mode.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Cluster group of nodes started in client mode.</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../org/apache/ignite/Ignition.html#setClientMode-boolean-"><code>Ignition.setClientMode(boolean)</code></a>,
<a href="../../../../org/apache/ignite/configuration/IgniteConfiguration.html#setClientMode-boolean-"><code>IgniteConfiguration.setClientMode(boolean)</code></a></dd>
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<div class="block">Creates a cluster group for all nodes that have cache with specified name, either in client or server modes.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>cacheName</code> - Cache name.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Cluster group over nodes that have specified cache running.</dd>
</dl>
</li>
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<div class="block">Creates a cluster group for all data nodes that have the cache with the specified name running.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>cacheName</code> - Cache name.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Cluster group over nodes that have the cache with the specified name running.</dd>
</dl>
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<div class="block">Creates a cluster group for all client nodes that access cache with the specified name.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>cacheName</code> - Cache name.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Cluster group over nodes that have the specified cache running.</dd>
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<pre><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html" title="interface in org.apache.ignite.cluster">ClusterGroup</a>&nbsp;forRemotes()</pre>
<div class="block">Gets cluster group consisting from the nodes in this cluster group excluding the local node.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Cluster group consisting from the nodes in this cluster group excluding the local node.</dd>
</dl>
</li>
</ul>
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<div class="block">Gets cluster group consisting from the nodes in this cluster group residing on the
same host as the given node.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>node</code> - Node to select the host for.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Cluster group for nodes residing on the same host as the specified node.</dd>
</dl>
</li>
</ul>
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<div class="block">Gets cluster group consisting from the nodes running on the hosts specified.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>host</code> - Host name to get nodes to put in cluster</dd>
<dd><code>hosts</code> - Host names to get nodes to put in cluster.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Cluster group for nodes residing on the hosts specified.</dd>
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</li>
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<pre><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html" title="interface in org.apache.ignite.cluster">ClusterGroup</a>&nbsp;forDaemons()</pre>
<div class="block">Gets a cluster group consisting from the daemon nodes.
<p>
Daemon nodes are the usual grid nodes that participate in topology but not
visible on the main APIs, i.e. they are not part of any cluster group. The only
way to see daemon nodes is to use this method.
<p>
Daemon nodes are used primarily for management and monitoring functionality that
is build on Ignite and needs to participate in the topology, but also needs to be
excluded from the "normal" topology, so that it won't participate in the task execution
or in-memory data grid storage.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Cluster group consisting from the daemon nodes.</dd>
</dl>
</li>
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<pre><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html" title="interface in org.apache.ignite.cluster">ClusterGroup</a>&nbsp;forRandom()</pre>
<div class="block">Creates a cluster group with one random node from the current cluster group.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Cluster group containing one random node from the current cluster group.</dd>
</dl>
</li>
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<pre><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html" title="interface in org.apache.ignite.cluster">ClusterGroup</a>&nbsp;forOldest()</pre>
<div class="block">Creates a cluster group with one oldest node from the current cluster group.
The resulting cluster group is dynamic and will always pick the next oldest
node if the previous one leaves topology even after the cluster group has
been created.
<p>
Use <a href="../../../../org/apache/ignite/cluster/ClusterGroup.html#node--"><code>node()</code></a> method to get the oldest node.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Cluster group containing one oldest node from the current cluster group.</dd>
</dl>
</li>
</ul>
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<pre><a href="../../../../org/apache/ignite/cluster/ClusterGroup.html" title="interface in org.apache.ignite.cluster">ClusterGroup</a>&nbsp;forYoungest()</pre>
<div class="block">Creates a cluster group with one youngest node in the current cluster group.
The resulting cluster group is dynamic and will always pick the newest
node in the topology, even if more nodes entered after the cluster group
has been created.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Cluster group containing one youngest node from the current cluster group.</dd>
</dl>
</li>
</ul>
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<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><span class='angle_bracket'>&lt;</span><a href="../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a><span class='angle_bracket'>&gt;</span>&nbsp;nodes()</pre>
<div class="block">Gets the read-only collection of nodes in this cluster group.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>All nodes in this cluster group.</dd>
</dl>
</li>
</ul>
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<h4>node</h4>
<pre><a href="../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a>&nbsp;node(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/UUID.html?is-external=true" title="class or interface in java.util">UUID</a>&nbsp;nid)</pre>
<div class="block">Gets a node for given ID from this cluster group.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>nid</code> - Node ID.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Node with given ID from this cluster group or <code>null</code>, if such node does not exist.</dd>
</dl>
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<pre><a href="../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a>&nbsp;node()</pre>
<div class="block">Gets first node from the list of nodes in this cluster group. This method is specifically
useful for cluster groups with one node only.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>First node from the list of nodes in this cluster group or <code>null</code> if the cluster group is empty.</dd>
</dl>
</li>
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<h4>hostNames</h4>
<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><span class='angle_bracket'>&lt;</span><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a><span class='angle_bracket'>&gt;</span>&nbsp;hostNames()</pre>
<div class="block">Gets the read-only collection of hostnames in this cluster group.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>All hostnames in this cluster group.</dd>
</dl>
</li>
</ul>
<a name="predicate--">
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<h4>predicate</h4>
<pre><a href="../../../../org/apache/ignite/lang/IgnitePredicate.html" title="interface in org.apache.ignite.lang">IgnitePredicate</a><span class='angle_bracket'>&lt;</span><a href="../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a><span class='angle_bracket'>&gt;</span>&nbsp;predicate()</pre>
<div class="block">Gets predicate that defines a subset of nodes for this cluster group.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Predicate that defines a subset of nodes for this cluster group.</dd>
</dl>
</li>
</ul>
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<h4>metrics</h4>
<pre><a href="../../../../org/apache/ignite/cluster/ClusterMetrics.html" title="interface in org.apache.ignite.cluster">ClusterMetrics</a>&nbsp;metrics()
throws <a href="../../../../org/apache/ignite/IgniteException.html" title="class in org.apache.ignite">IgniteException</a></pre>
<div class="block">Gets a metrics snapshot for this cluster group.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Metrics snapshot.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../org/apache/ignite/IgniteException.html" title="class in org.apache.ignite">IgniteException</a></code> - If this cluster group is empty.</dd>
</dl>
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