peer节点的分类
- 任何节点都是提交节点
- 安装了智能合约的就是背书节点
- 主节点负责获取块，可以有多个
- 錨节点是可选配置，负责和其它组织通讯
官方文档
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Committing peer. Every peer node in a channel is a committing peer. It receives blocks of generated transactions, which are subsequently validated before they are committed to the peer node’s copy of the ledger as an append operation.
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Endorsing peer. Every peer with a smart contract can be an endorsing peer if it has a smart contract installed. However, to actually be an endorsing peer, the smart contract on the peer must be used by a client application to generate a digitally signed transaction response. The term endorsing peer is an explicit reference to this fact.
An endorsement policy for a smart contract identifies the organizations whose peer should digitally sign a generated transaction before it can be accepted onto a committing peer’s copy of the ledger.These are the two major types of peer; there are two other roles a peer can adopt:
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Leader peer. When an organization has multiple peers in a channel, a leader peer is a node which takes responsibility for distributing transactions from the orderer to the other committing peers in the organization. A peer can choose to participate in static or dynamic leadership selection.
It is helpful, therefore to think of two sets of peers from leadership perspective – those that have static leader selection, and those with dynamic leader selection. For the static set, zero or more peers can be configured as leaders. For the dynamic set, one peer will be elected leader by the set. Moreover, in the dynamic set, if a leader peer fails, then the remaining peers will re-elect a leader.
It means that an organization’s peers can have one or more leaders connected to the ordering service. This can help to improve resilience and scalability in large networks which process high volumes of transactions. -
Anchor peer. If a peer needs to communicate with a peer in another organization, then it can use one of the anchor peers defined in the channel configuration for that organization. An organization can have zero or more anchor peers defined for it, and an anchor peer can help with many different cross-organization communication scenarios.
Note that a peer can be a committing peer, endorsing peer, leader peer and anchor peer all at the same time! Only the anchor peer is optional – for all practical purposes there will always be a leader peer and at least one endorsing peer and at least one committing peer.