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[[modules-discovery]]
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== Discovery
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The discovery module is responsible for discovering nodes within a
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cluster, as well as electing a master node.
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2014-01-06 15:58:46 -05:00
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Note, Elasticsearch is a peer to peer based system, nodes communicate
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with one another directly if operations are delegated / broadcast. All
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the main APIs (index, delete, search) do not communicate with the master
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node. The responsibility of the master node is to maintain the global
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cluster state, and act if nodes join or leave the cluster by reassigning
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shards. Each time a cluster state is changed, the state is made known to
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the other nodes in the cluster (the manner depends on the actual
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discovery implementation).
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[float]
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=== Settings
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The `cluster.name` allows to create separated clusters from one another.
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The default value for the cluster name is `elasticsearch`, though it is
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recommended to change this to reflect the logical group name of the
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cluster running.
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2014-02-05 12:06:39 -05:00
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include::discovery/azure.asciidoc[]
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include::discovery/ec2.asciidoc[]
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2014-02-05 12:06:39 -05:00
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include::discovery/gce.asciidoc[]
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include::discovery/zen.asciidoc[]
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