41 lines
1021 B
Markdown
41 lines
1021 B
Markdown
**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
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[v3-docs]: ../docs.md#documentation
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# Glossary
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This document defines the various terms used in etcd documentation, command line and source code.
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## Node
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Node is an instance of raft state machine.
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It has a unique identification, and records other nodes' progress internally when it is the leader.
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## Member
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Member is an instance of etcd. It hosts a node, and provides service to clients.
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## Cluster
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Cluster consists of several members.
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The node in each member follows raft consensus protocol to replicate logs. Cluster receives proposals from members, commits them and apply to local store.
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## Peer
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Peer is another member of the same cluster.
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## Proposal
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A proposal is a request (for example a write request, a configuration change request) that needs to go through raft protocol.
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## Client
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Client is a caller of the cluster's HTTP API.
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## Machine (deprecated)
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The alternative of Member in etcd before 2.0
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