英文:
prometheus-operator: what is the difference between shards and replicas?
问题
replicas 和 shards 之间的区别是什么？
英文:
The following manifest creates a Prometheus server with two replicas and two shards:
apiVersion: monitoring.coreos.com/v1
kind: Prometheus
metadata:
labels:
prometheus: prometheus
name: prometheus
namespace: default
spec:
serviceAccountName: prometheus
replicas: 2
shards: 2
serviceMonitorSelector:
matchLabels:
team: frontend
What is the difference between replicas and shards?
答案1
得分: 2
在Prometheus中，Sharding涉及将指标分割到多个服务器上，以提高性能（特别是查询性能）和可伸缩性。每个分片负责收集和存储总指标的子集。
Replication涉及在多个服务器上创建数据的多个副本，以增加可用性和容错性。每个副本包含数据的完整副本，对一个副本进行的任何更改最终都会传播到其他副本。
这对于任何应用程序都是适用的 - 分片和复制是用来描述这一概念的通用概念，而不是Prometheus特有的内容。这在数据库中被广泛使用。
英文:
Sharding in Prometheus involves splitting the metrics across multiple servers, to improve performance (especially query performance) and scalability. Each shard is responsible for collecting and storing a subset of the total metrics.
Replication involves creating multiple copies of the data across multiple servers, to increase availability and fault tolerance. Each replica contains a full copy of the data, and any changes made to one replica are eventually propagated to the others.
This is true for any app - shard and replication are generic concepts used to describe this and not something specific to prometheus. This is widely used in Databases.
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