Cassandra 如何选择协调器节点和复制节点? [英] how Cassandra chooses the coordinator node and the replication nodes?

问题描述

Cassandra 客户端如何选择协调器节点?协调器节点是否在复制之前存储了客户端发送的数据?

How the Cassandra client chooses the coordinator node? is the coordinator node stores the data sent by the client before replicating?

推荐答案

协调器节点通常由考虑网络距离"的算法选择.任何节点都可以充当协调器，首先请求将发送到您的驱动程序知道的节点.但是一旦它连接并了解您的集群的拓扑结构，它可能会变成一个更接近"的协调器.

The coordinator node is typically chosen by an algorithm which takes "network distance" into account. Any node can act as the coordinator, and at first requests will be sent to the nodes which your driver knows about. But once it connects and understands the topology of your cluster, it may change to a "closer" coordinator.

如果协调器最终成为负责数据令牌范围的节点之一，则协调器仅在本地(写入时)存储数据.

The coordinator only stores data locally (on a write) if it ends up being one of the nodes responsible for the data's token range.

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