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Thanos is a distributed metrics query engine and monitoring scalability suite designed to provide a unified interface for aggregating data from multiple Prometheus servers and clusters. It functions as a high availability monitoring backend that eliminates single points of failure by deduplicating data from replicated instances. The system enables long-term retention by persisting time-series data to cloud-native object storage, allowing for unlimited historical archiving beyond the limits of local disks. It further optimizes this storage through a downsampling and retention manager that comp

Pinot is a distributed, columnar analytical database designed for high-concurrency, low-latency query processing. It functions as a real-time OLAP datastore, enabling interactive, user-facing analytics by ingesting and querying massive datasets from both streaming and batch sources. The system architecture relies on a centralized controller for cluster coordination and a distributed segment-based storage model to ensure horizontal scalability. The platform distinguishes itself through a hybrid ingestion pipeline that unifies real-time event streams and historical batch data into a single quer

m3 是一个分布式时间序列数据库，专为高分辨率指标和高基数数据管理而设计。它作为一个可扩展的存储系统和多集群查询引擎，提供了一个分布式指标聚合器，能够在数据提交到存储之前进行降采样和汇总。 该项目以其使用 etcd 进行节点成员管理和分片放置的协调集群模型而脱颖而出。它支持多种摄取协议，包括 Prometheus 远程写入协议、InfluxDB 行协议和 Graphite Carbon 纯文本协议，并提供与 PromQL 和 Graphite 兼容的查询接口。 该系统涵盖了广泛的功能领域，包括列式时间序列存储、同步数据复制和分布式查询扇出。它集成了数据生命周期自动化、基于法定人数 (Quorum) 的一致性调整，以及基于标签的序列索引，以在隔离的命名空间中保持数据完整性和检索速度。 集群编排和组件放置通过自动化工具和 Operator 进行管理，以确保高可用性和均衡的数据分布。