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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
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| <h3 id="classes">Classes
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| <h4><a class="xref" href="Apache.Ignite.Core.Cache.Affinity.Rendezvous.ClusterNodeAttributeAffinityBackupFilter.html">ClusterNodeAttributeAffinityBackupFilter</a></h4>
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| <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's say Ignite cluster of 12 nodes is deployed into 3 racks - r1, r2, r3. Ignite nodes |
| have "SITE" attributes set accordingly to "r1", "r2", "r3". 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 "SITE" attribute set to "r1", all other nodes with "SITE"="r1" are excluded |
| by this filter when selecting the backup node.</p> |
| </section>
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| <h4><a class="xref" href="Apache.Ignite.Core.Cache.Affinity.Rendezvous.RendezvousAffinityFunction.html">RendezvousAffinityFunction</a></h4>
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| <section><p>Affinity function for partitioned cache based on Highest Random Weight algorithm.</p> |
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