How medium uses Neo4j

May 26, 2015Download as PPTX, PDF3 likes806 views

This document discusses how Medium uses Neo4j as its graph database. It begins with an introduction to Medium and its goals. It then describes Medium's evaluation of different data store options before choosing Neo4j for its ability to model Medium's social network graph and enable complex queries. The rest of the document outlines Medium's architecture using Neo4j, process of migrating to Neo4j, techniques for optimizing performance, and includes a live demo of Neo4j queries on Medium's data.

How Medium uses Neo4j
Nathaniel Felsen
May 20th, 2015

About Me
Nathaniel Felsen
Data & DevOps engineer
nathanielfelsen
n@medium.com
@faitlezen

Agenda
• What is Medium and what problem we are solving through Neo4j ?
• Why did we pick Neo4j ?
• Our architecture
• Steps taken and obstacles encountered while going live
• Improve Neo4j’s performances
• Live Demo

• Easiest, fastest way to create a
beautiful story
• Seamless integration of photos,
audio & video
• Optimized for web, tablet &
mobile
Medium is a beautiful
publishing experience.

Medium is a home for
influential contributors.

• Follow, share, recommend
• Personalized story feed
• Customized daily emails &
notifications
Medium is a network that
builds audience.

DynamoDB
• Need to nail the schema ≠ Experimentation
• Limited ways of querying data
• Things like short path between users won’t
perform well
Pros
• Expertise
• Already used to store user info
• No maintenance
• No hardware
Cons

• Using Relational database to
create graphs
• Sharding
Pros
• Used by lots of people and
heavily vetted.
• Less rampup for learning
querying language.
• Strong community.
Cons

Pros
Flock DB
• Not maintained anymore
• 2 tiers model
• Deal with sharding in the near
future
• Expertise
• SQL Lite syntax
• Open Source / Free
Cons

• Not free
• No expertise in house
• Requires hardware
Pros
• Easy to start
• Easy to experiment
• Good community
• Enteprise edition: HA, Backup, Support
Cons

Nodes
• User
• Post
• Collection
Relationships
• Edited
• Wrote
• Published
• Recommended
• Followed
• …

Use queues for the
writes
Write are done to the master only
If you lose your master, you need
to wait for a new election

Metrics / Monitoring
• Architecture
• Systems
• Neo4j
• Dataset
• Java
• Services that interact with Neo4j

Logs aggregation /
Indexing
• ElasticSearch
• Logstash
• Logstash forwarder
• Kibana

Backups
• Incremental Backup
• Full Backup

What Neo4j is good and not as good at
Long Traversal Where NOT Dense / Super Node

Cypher Tricks
http://watch.neo4j.org/video/84900121

Tune the configuration
over time
• Java Garbage collection (stop the world)
• Neo4j settings

Server Plugins & Unmanaged Extensions
• Easy to Deploy
• The server’s functionality can be extended by adding plugins.
• RESTful Web Services (JAX-RS)
• Put more logic in the code like caching
• Sharp tool

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Toradex brings robust Linux support to SMARC (Smart Mobility Architecture), ensuring high performance and long-term reliability for embedded applications. Here’s how: • Optimized Torizon OS & Yocto Support – Toradex provides Torizon OS, a Debian-based easy-to-use platform, and Yocto BSPs for customized Linux images on SMARC modules. • Seamless Integration with i.MX 8M Plus and i.MX 95 – Toradex SMARC solutions leverage NXP’s i.MX 8 M Plus and i.MX 95 SoCs, delivering power efficiency and AI-ready performance. • Secure and Reliable – With Secure Boot, over-the-air (OTA) updates, and LTS kernel support, Toradex ensures industrial-grade security and longevity. • Containerized Workflows for AI & IoT – Support for Docker, ROS, and real-time Linux enables scalable AI, ML, and IoT applications. • Strong Ecosystem & Developer Support – Toradex offers comprehensive documentation, developer tools, and dedicated support, accelerating time-to-market. With Toradex’s Linux support for SMARC, developers get a scalable, secure, and high-performance solution for industrial, medical, and AI-driven applications. Do you have a specific project or application in mind where you're considering SMARC? We can help with Free Compatibility Check and help you with quick time-to-market For more information: https://www.toradex.com/computer-on-modules/smarc-arm-family

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