Elasticsearch is a distributed search engine: clients speak HTTP, nodes form a TCP mesh, a master publishes ClusterState, and each data node stores …

Redis stores the live keyspace in memory and may persist it to disk with RDB snapshots and AOF logs. In Cluster mode the keyspace is partitioned into …

Redis Cluster keeps a second network plane beside client RESP: the cluster bus. Nodes use it to discover peers, share slot and epoch views, detect …

Redis Pub/Sub is an in-process fan-out over named channels and glob patterns. It is not the keyspace: messages are not stored as keys, have no TTL or …

Redis stores keys in memory and serves RESP commands on a single-threaded event loop. This post covers four areas from the current source under …

Build Redis from source on Fedora and debug redis-server in CLion. Architecture notes: Redis internals, Pub/Sub, Cluster bus.

This article examines MySQL INSERT and UPDATE from the SQL command layer through table and metadata locking into InnoDB record locking, undo …

For many years, MySQL executed SQL queries using a deeply nested, monolithic executor loop. Functions like JOIN::exec() and evaluate_join_record() …

Grouping and aggregation are cornerstones of relational databases. In MySQL, executing a GROUP BY statement involves a sophisticated dance between the …

This article introduces general concept of Elastic search.

This article introduces spring kafka client

This article introduces RocketMQ server Architecture and Implementation

This article introduces the internal architecture and implementation details of MySQL’s default storage engine, InnoDB, exploring its memory …

Kibana is a browser based analytics and search dashboard for ElasticSearch

This Article Introduces RocketMQ Architecture.

This article introduces Mysql Metadata

This article provides an in-depth dive into MySQL query processing internals, tracing the lifecycle of a query from the network connection to parsing, …