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Java 学习&面试指南（Go、Python 后端面试通用,计算机基础面试总结）。准备后端技术面试，首选 JavaGuide！
Free and Open Source, Distributed, RESTful Search Engine
Apollo is a reliable configuration management system suitable for microservice configuration management scenarios.
APM, Application Performance Monitoring System
ANTLR (ANother Tool for Language Recognition) is a powerful parser generator for reading, processing, executing, or translating structured text or binary files.
Most popular Mocking framework for unit tests written in Java
Apache Pulsar - distributed pub-sub messaging system
Very spicy additions to the Java programming language.
Official repository of Trino, the distributed SQL query engine for big data, formerly known as PrestoSQL (https://trino.io)
Upserts, Deletes And Incremental Processing on Big Data.
A production-grade java implementation of RAFT consensus algorithm.
Log analyser / visualiser for Java HotSpot JIT compiler. Inspect inlining decisions, hot methods, bytecode, and assembly. View results in the JavaFX user interface.
World's most powerful open data catalog for building a high-performance, geo-distributed and federated metadata lake.
OpenTelemetry auto-instrumentation and instrumentation libraries for Java
A High Dynamic Range (HDR) Histogram
A high performance replicated log service. (The development is moved to Apache Incubator)
Apache TinkerPop - a graph computing framework
Pravega - Streaming as a new software defined storage primitive
Apache BookKeeper - a scalable, fault tolerant and low latency storage service optimized for append-only workloads
Nessie: Transactional Catalog for Data Lakes with Git-like semantics
Apache XTable (incubating) is a cross-table converter for lakehouse table formats that facilitates interoperability across data processing systems and query engines.