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  <h1 id="Apache_Ignite_Core_Cache_Affinity_Rendezvous" data-uid="Apache.Ignite.Core.Cache.Affinity.Rendezvous" class="text-break">Namespace Apache.Ignite.Core.Cache.Affinity.Rendezvous
  </h1>
  <div class="markdown level0 summary"></div>
  <div class="markdown level0 conceptual"></div>
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    <h3 id="classes">Classes
  </h3>
      <h4><a class="xref" href="Apache.Ignite.Core.Cache.Affinity.Rendezvous.ClusterNodeAttributeAffinityBackupFilter.html">ClusterNodeAttributeAffinityBackupFilter</a></h4>
      <section><p>Attribute-based affinity backup filter, see <a class="xref" href="Apache.Ignite.Core.Cluster.IBaselineNode.html#Apache_Ignite_Core_Cluster_IBaselineNode_Attributes">Attributes</a>,
<a class="xref" href="Apache.Ignite.Core.Cache.Affinity.Rendezvous.RendezvousAffinityFunction.html#Apache_Ignite_Core_Cache_Affinity_Rendezvous_RendezvousAffinityFunction_AffinityBackupFilter">AffinityBackupFilter</a>.
<p>
This filter can be used to ensure that, for a given partition, primary and backup nodes are selected from
different racks in a datacenter, or from different availability zones in a cloud environment, so that
a single hardware failure does not cause data loss.
<p>
This implementation will discard backups rather than place multiple on the same set of nodes. This avoids
trying to cram more data onto remaining nodes  when some have failed.
<p>
This class is constructed with a set of node attribute names, and a candidate node will be rejected if
<em>any</em> of the previously selected nodes for a partition have identical values for <em>all</em> of those attributes
on the candidate node. Another way to understand this is the set of attribute values defines the key of a
group into which a node is placed, and the primaries and backups for a partition cannot share nodes
in the same group. A null attribute is treated as a distinct value, so two nodes with a null attribute will
be treated as having the same value.
<p>
For example, let&apos;s say Ignite cluster of 12 nodes is deployed into 3 racks - r1, r2, r3. Ignite nodes
have &quot;SITE&quot; attributes set accordingly to &quot;r1&quot;, &quot;r2&quot;, &quot;r3&quot;. For a cache with 1 backup
(<a class="xref" href="Apache.Ignite.Core.Cache.Configuration.CacheConfiguration.html#Apache_Ignite_Core_Cache_Configuration_CacheConfiguration_Backups">Backups</a> set to <code>1</code>), every partition is assigned to 2 nodes.
When the primary node has &quot;SITE&quot; attribute set to &quot;r1&quot;, all other nodes with &quot;SITE&quot;=&quot;r1&quot; are excluded
by this filter when selecting the backup node.</p>
</section>
      <h4><a class="xref" href="Apache.Ignite.Core.Cache.Affinity.Rendezvous.RendezvousAffinityFunction.html">RendezvousAffinityFunction</a></h4>
      <section><p>Affinity function for partitioned cache based on Highest Random Weight algorithm.</p>
</section>
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