Cassandra：更大的复制因子=更快的读取？ [英] Cassandra: bigger replication factor = faster reads?

问题描述

增加群集上的复制因素还会提高读取速度吗？

Does increasing replication factor on a cluster also increase the read speed?

我理解，当复制因子为1，并且有6个节点和令牌平均分布时 - 那么给定节点只有16,66％的机会有数据，如果没有它，它会询问负责的节点，这需要额外的时间。

I understand that when replication factor is 1, and there's 6 nodes and the tokens are distributed equally - then it's only 16,66% chance that given node has the data, if it does not have it, it asks the node responsible and that takes extra time.

我想，复制因子设置为6，每个节点都有完整的数据集，可以立即获取数据而不需要请求其他节点（我们使用读一致性= 1）。所以增加复制因子应提高阅读速度。它是否正确？

I guess that with replication factor set to 6, each node has the full dataset and can fetch data immediately without asking other nodes (we're using read consistency=1). So increasing replication factor should increase reading speed. Is this correct?

我们的应用程序写入数量相对较少，但每秒可以执行超过10k次get（）操作。我们在集群中有6个节点，我们需要所有的读操作都非常快，这就是为什么我们正在寻找一种提高cassandra读取性能的方法。

Our app has relatively few writes but more than 10k get() operations per second. We have 6 nodes in the cluster and we need all read operations to be extremely fast, that's why we're looking for a way to improve cassandra's read performance.

推荐答案

这是正确的，只要你使用ConsistencyLevel.ONE。

That's correct, as long as you're using ConsistencyLevel.ONE.

这篇关于Cassandra：更大的复制因子=更快的读取？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！