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21CTO
21CTO
Aug 24, 2024 · Backend Development

How PayPal Scaled to Billions of Transactions with Only 8 VMs via Actor Model

PayPal’s rapid growth forced it to process millions of transactions daily, leading the engineering team to expand beyond a thousand virtual machines and confront escalating network, maintenance, and resource challenges, which they solved by adopting the Akka‑based Actor model and implementing a Go‑based actor system for efficient, fault‑tolerant concurrency.

AkkaPayPalactor-model
0 likes · 11 min read
How PayPal Scaled to Billions of Transactions with Only 8 VMs via Actor Model
DaTaobao Tech
DaTaobao Tech
Nov 4, 2022 · Backend Development

Designing Stateful and Resource‑Safe Reactive Stream Operators with statefulMap

The article shows how a unified abstraction called statefulMap, together with a resource‑aware mapWithResource primitive, lets developers implement a wide range of complex reactive‑stream operators—such as buffering, indexing, deduplication, and safe DB access—in a concise, composable, thread‑safe manner, dramatically reducing boilerplate code.

AkkaJavaReactive Streams
0 likes · 15 min read
Designing Stateful and Resource‑Safe Reactive Stream Operators with statefulMap
Zuoyebang Tech Team
Zuoyebang Tech Team
Jun 17, 2022 · Big Data

How FlinkSQL Auto‑Tuning Saves Resources and Guarantees SLA

This article describes the design and implementation of an automated FlinkSQL tuning system that monitors metrics, evaluates task health with rule‑based logic, calculates optimal resource adjustments, and performs fast scaling to reduce cluster waste, lower operational costs, and maintain SLA compliance.

AkkaAuto ScalingFlink
0 likes · 15 min read
How FlinkSQL Auto‑Tuning Saves Resources and Guarantees SLA
DataFunTalk
DataFunTalk
Mar 18, 2021 · Fundamentals

Building Popper: Tubi’s Scalable Experimentation Platform

Tubi’s Popper platform combines a Scala‑based experiment engine, reproducible JSON‑stored configurations, a React UI, and data pipelines using Spark and Akka to enable fast, cross‑team A/B testing, automated analysis, health checks, and data‑driven decision making across mobile and OTT services.

A/B testingAkkaExperimentation platform
0 likes · 15 min read
Building Popper: Tubi’s Scalable Experimentation Platform
Bitu Technology
Bitu Technology
Mar 12, 2021 · Backend Development

Building Popper: Tubi’s Scalable Experiment Platform for Data‑Driven Decision Making

At Tubi, the Popper experiment engine—a Scala‑based, Akka‑powered backend service—combined with a self‑serve UI, automated analysis pipelines, and rigorous health checks, enables teams across ML, mobile, and OTT to run scalable A/B tests, rapidly iterate, and make data‑driven product decisions.

A/B testingAkkaExperiment Platform
0 likes · 14 min read
Building Popper: Tubi’s Scalable Experiment Platform for Data‑Driven Decision Making
Bitu Technology
Bitu Technology
Feb 2, 2021 · Backend Development

Recap of the Online Scala Meetup: Reactive Ad Platform, Functional Programming, Scala 3 Typeclasses, and Spring‑Akka Microservices

The 2021 Online Scala Meetup organized by Tubi featured four technical talks covering a fully reactive ad‑serving platform built with Scala and Akka‑Streams, a pragmatic take on functional programming, Scala 3 typeclass implementation, and a Spring‑Akka microservice integration, followed by summaries and recruitment information.

AkkaMicroservicesScala
0 likes · 4 min read
Recap of the Online Scala Meetup: Reactive Ad Platform, Functional Programming, Scala 3 Typeclasses, and Spring‑Akka Microservices
Bitu Technology
Bitu Technology
Sep 25, 2020 · Backend Development

Scala Meetup Recap: Akka State Management, Parsec Combinators, and ZIO Overview

The article summarizes a 2020 Scala online meetup, covering Akka's distributed state‑management for ad‑serving, Parsec parser combinators for arithmetic expression evaluation, AST manipulation with ANTLR, and an introduction to the functional ZIO library, while reflecting on personal takeaways.

AkkaMeetupParser Combinators
0 likes · 12 min read
Scala Meetup Recap: Akka State Management, Parsec Combinators, and ZIO Overview
dbaplus Community
dbaplus Community
Sep 6, 2020 · Operations

Building a High‑Performance Monitoring Alert System with Akka, Dubbo, and Ignite

The article outlines G Bank’s transition from a single‑threaded commercial monitoring solution to a self‑developed, open‑source based alert system that leverages Akka for parallel collection, Apache Dubbo for distributed processing, and Apache Ignite for in‑memory storage, achieving million‑level alert capacity, sub‑100 ms latency, and linear scalability.

AkkaApache DubboApache Ignite
0 likes · 17 min read
Building a High‑Performance Monitoring Alert System with Akka, Dubbo, and Ignite
Bitu Technology
Bitu Technology
Nov 15, 2019 · Backend Development

Recap of the Scala Meetup: Cats Introduction and Akka Applications

The November 3 Scala Meetup featured senior expert Deng Caoyuan’s whiteboard brainstorming and Tencent engineer Qu Guodong’s Cats tutorial, followed by a deep dive into Akka with real‑world examples such as a financial computing platform, real‑time article recommendation, web crawling, streaming, and practical tips for Scala developers.

AkkaCatsMeetup
0 likes · 7 min read
Recap of the Scala Meetup: Cats Introduction and Akka Applications
Bitu Technology
Bitu Technology
Nov 13, 2019 · Backend Development

Rebuilding Tubi's Advertising System with Scala and Akka – Part 1: Request Parsing, Validation, and Filtering

This article explains why Tubi rewrote its legacy PHP ad platform, how it adopted Scala, Akka, and Reactive Streams to model the ad request lifecycle as a reactive stream, and details the first three processing steps—parsing, enrichment, and precise filtering—along with sample Scala filter code.

AdTechAkkaMicroservices
0 likes · 8 min read
Rebuilding Tubi's Advertising System with Scala and Akka – Part 1: Request Parsing, Validation, and Filtering
Tencent Cloud Developer
Tencent Cloud Developer
Oct 15, 2019 · Backend Development

Improving System Performance and Availability with Reactive Programming: The Flower Framework

The Flower framework, built on Akka Actors, demonstrates how reactive programming’s responsive, resilient, elastic, and message‑driven principles can replace traditional blocking thread models with asynchronous, non‑blocking I/O, allowing a few container threads to handle many requests, doubling throughput, halving latency, and markedly improving system availability.

AkkaAsynchronousFlower framework
0 likes · 11 min read
Improving System Performance and Availability with Reactive Programming: The Flower Framework
Meituan Technology Team
Meituan Technology Team
Sep 14, 2017 · Backend Development

Java Concurrency Q&A: Akka, Locks, ThreadPoolExecutor, and More

The article answers twelve Java concurrency questions, covering Meituan’s simple Akka use, when to prefer ReentrantLock or synchronized, queue rejection policies, Java 8 ConcurrentHashMap internals, ThreadPoolExecutor workflow, read‑write locks and Conditions, interview preparation, beginner resources, volatile ordering nuances, and notes on unclear flash‑sale overselling safeguards.

AkkaJavaLocks
0 likes · 10 min read
Java Concurrency Q&A: Akka, Locks, ThreadPoolExecutor, and More
Java High-Performance Architecture
Java High-Performance Architecture
Oct 28, 2016 · Backend Development

How LinkedIn Scaled Its Instant Messaging to Hundreds of Thousands of Connections

This article explains how LinkedIn engineered its instant‑messaging service using Server‑Sent Events, Java, Akka, and Play, and details key kernel and system‑level optimizations—such as socket backlog, temporary port exhaustion, and file‑descriptor limits—that enabled each server to handle hundreds of thousands of persistent connections.

AkkaInstant MessagingJava
0 likes · 5 min read
How LinkedIn Scaled Its Instant Messaging to Hundreds of Thousands of Connections
21CTO
21CTO
Dec 14, 2015 · Backend Development

How Wacai Built a Scalable FinTech Architecture: 6 Key Design Strategies

Wacai’s architects outline six critical design decisions—including system layer separation, message passing, asynchronous processing, comprehensive data storage, robust security, and storage redundancy—that together enable a resilient, reactive financial platform capable of handling massive concurrent workloads.

AkkaFinTechKafka
0 likes · 8 min read
How Wacai Built a Scalable FinTech Architecture: 6 Key Design Strategies
Architect
Architect
Aug 30, 2015 · Backend Development

Snowball Architecture Overview and Optimization Practices

This article presents a detailed overview of Snowball's backend architecture, technology stack, service decomposition, and the series of performance and scalability optimizations—including quote server, IM service, database caching, monitoring, and deployment strategies—implemented to support rapid growth and market volatility.

AkkaBackendFinagle
0 likes · 21 min read
Snowball Architecture Overview and Optimization Practices
Art of Distributed System Architecture Design
Art of Distributed System Architecture Design
May 10, 2015 · Backend Development

Migrating Whitepages Services from Ruby to Scala and Akka: Performance Gains and Lessons Learned

Whitepages migrated several high‑traffic services from a Ruby monolith to Scala running on the Akka actor framework, achieving dramatically lower latency and higher throughput while sharing the practical benefits, challenges, and best‑practice insights they discovered during the transition.

AkkaRubyScala
0 likes · 6 min read
Migrating Whitepages Services from Ruby to Scala and Akka: Performance Gains and Lessons Learned
Qunar Tech Salon
Qunar Tech Salon
Nov 15, 2014 · Backend Development

Understanding the Actor Model with Akka: Concepts, Messaging, and Fault Tolerance

This article summarizes Arun Manivannan's six‑post series that uses clear analogies and simple Akka examples to explain the Actor model, its message‑passing semantics, lifecycle, hierarchical structure, fault‑tolerance mechanisms, and cross‑platform implementations for building concurrent backend systems.

AkkaBackend Developmentactor-model
0 likes · 5 min read
Understanding the Actor Model with Akka: Concepts, Messaging, and Fault Tolerance