Cassandra Java驱动程序：有多少联系人是合理的？ [英] Cassandra Java driver: how many contact points is reasonable?

问题描述

在Java中，我连接到Cussandra集群，如下所示：

In Java I connect to Cussandra cluster as this:

Cluster cluster = Cluster.builder().addContactPoints("host-001","host-002").build();

我需要指定集群中的所有主机吗？如果我有一个1000个节点的集群？我随机选择几个？

Do I need to specify all hosts of the cluster in there? What If I have a cluster of 1000 nodes? Do I randomly choose few? How many, and do I really do that randomly?

推荐答案

我的方法是添加尽可能多的节点 - 原因很简单：种子仅仅用于集群启动，但是一旦集群启动并且运行种子只是公共节点 - 仅使用种子可能导致不可能在工作集群中连接 - 所以我给自己最好的机会连接到集群，保持一个合理数量的节点 - 足够一个工作节点获取当前集群配置。

My approach is to add as many nodes as I can -- The reason is simple: seeds are necessary only for cluster boot but once the cluster is up and running seeds are just common nodes -- using only seeds may result in the impossibility to connect in a working cluster -- So I give myself the best chances to connect to the cluster keeping a more than reasonable amount of nodes -- it's enough one working node to get the current cluster configuration.

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