apache-ignite

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// Licensed to the Apache Software Foundation (ASF) under one or more
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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= Clustering
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== Overview
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In this chapter, we discuss different ways nodes can discover each other to form a cluster.
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On start-up, a node is assigned either one of the two roles: _server node_ or _client node_.
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Server nodes are the workhorses of the cluster; they cache data, execute compute tasks, etc.
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Client nodes join the topology as regular nodes but they do not store data. Client nodes are used to stream data into the cluster and execute user queries.
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To form a cluster, each node must be able to connect to all other nodes. To ensure that, a proper <<Discovery Mechanisms,discovery mechanism>> must be configured.
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NOTE: In addition to client nodes, you can use Thin Clients to define and manipulate data in the cluster.
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Learn more about the thin clients in the link:thin-clients/getting-started-with-thin-clients[Thin Clients] section.
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image::images/ignite_clustering.png[Ignite Cluster]
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== Discovery Mechanisms
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Nodes can automatically discover each other and form a cluster.
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This allows you to scale out when needed without having to restart the whole cluster.
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Developers can also leverage Ignite's hybrid cloud support that allows establishing connection between private and public clouds such as Amazon Web Services, providing them with the best of both worlds.
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Ignite provides two implementations of the discovery mechanism intended for different usage scenarios:
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* link:clustering/tcp-ip-discovery[TCP/IP Discovery] is designed and optimized for 100s of nodes.
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* link:clustering/zookeeper-discovery[ZooKeeper Discovery] that allows scaling Ignite clusters to 100s and 1000s of nodes preserving linear scalability and performance.
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