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Running Neo4j on a Large
Scale Image Platform
Wouter Crooy & Ruben Heusinkveld
15-02-2018
Who are we
• Wouter Crooy – Solution Architect
• Ruben Heusinkveld – Solution Architect
• Neo4j Certified Professionals
@wcrooy
@rheusinkveld
The photo organizer
• Deliver well organized, easy to use and secure storage for all
your images
• Ease the process of selecting photos for creating photo
products
• Started as part of a R&D ‘Skunk works’ project
The photo organizer
The photo organizer
The photo organizer
The photo organizer – from photos to products
The photo organizer
https://minnebanken.no
The challenge
The challenge
• Replace legacy system with the new photo organizer
• Move 1.3 PB of photos from on premise to cloud storage
• Analyze & organize all photos (511 million)
• Data cleansing while importing
• Using the same technology / architecture during import and
after
• Ability to add features while importing
• Core of the systems are built in .NET
The import
• Hard deadline
• Factory closing that holds the data center with all photos
• Started 1st of April
• Minimum processing of 150 images / second
• ~500 queries / second to database (Neo4j)
• Up to 700 EC2 instances on AWS
Solution
How we did/do it
• Micro services
• Command Query Responsibility Segregation (CQRS)
• Neo4j
• Multiple write nodes
• Single master read only nodes
• Serverless (AWS Lambda)
Architecture
Neo4j
Cluster
HaProxy
Query Command
Frontend
Amazon
ElastiCache
Photo
processors
Other Services
• Notifications
• Authentication
• ....
Preview
Generation
Storage
Other database
(clusters)
Why we choose Neo4j
• Close to domain model
• Not an ordinary (relational) database
• Looking for relations between photos/users
• Scalable
• Flexible schema
• Natural / fluent queries
• ACID / data consistency
Model design
Graph model
User
Photo
Photo
Event
BelongsTo
BelongsTo
Contains
Contains
HasEvent
Graph model
User
Photo
BelongsTo Photo
Day
Day
Month
Year
DateTaken
Day Month
DateTaken
Day
Time
line
Year
HasTimeline
BelongsTo
Graph model
User PhotoBelongsTo
Collec
tion
OwnsCollection HasItem
UserIsSharedWith
Our Neo4j database
• More than 1.4 billion nodes
• 4.6 billion properties
• 3.7 billion relations
• Total store size of 890 GB
Improve your model
• Training
• Neo4j on Slack
• Support engineers
• Query planner
• Query logging (use with care!)
dbms.logs.query.allocation_logging_enabled=true
dbms.logs.query.time_logging_enabled=true
dbms.logs.query.page_logging_enabled=true
Bumps and Solutions
Command Query Responsibility Segregation
• Seperation between writing and reading data
• Different model between Query and Command API
• Independent scaling
UI
Cache
DB
Component
Component
Update
Publish
Write
Query
Command
CQRS Seperate Reads & Writes
• No active event publishing in place
• Specific scenarios for updating / writing data
• Ability to create seperate model for read and write
• Updates (pieces) of the user graph
• Requires reliable and consistent read
• Scale out -> overloading locking of (user) graph
• After import
• Low performance scenarios -> cache with lower update priority
Read after write consistency
• All reads should contain the very latest and most accurate
data
• Replication delay between servers
• Split on consistency
• Article by Aseem Kishore:
• https://neo4j.com/blog/advanced-neo4j-fiftythree-reading-writing-
scaling/
Graph locking
• Concurrency challenge
• Scale-out => more images from the same user
• Manage the input
• High spread of user/image combination
• Prevent concurrent analysis of multiple images from the same user
Graph design considerations
• Property scan
• (User)<-[:BelongsTo]-(Photo)
• More photos
• Property search => full-graph-scan
• Differentiating property
• Create node
• Making changes to the schema….
• For 550+ million nodes
Managing a (very) large graph
• Finding the sweet spot between cluster size
• Make sure the reads are busy enough
• More nodes => more load on write master
• Optimal memory vs graph store size
• 1:1
• We are not afraid of polyglot persistency
• We moved EXIF data to document store (DynamoDB)
• User tend to upload photos in (big)batch
• Manage input to prevent race conditions
• Simultaneous creation of nodes => more concurrent locking of the
user graph
Managing a (very) large graph (2)
• APOC (Periodic Iterate / Commit) (550mln photos)
• Adding labels to nodes to be updated => 120 minutes
• Adding additional relation, removing of additional label => 3
minutes
• Combining writes if possible for faster write performance
• APOC Do When
The future
The future
• Upgrade to Neo4j 3.3
• Neo4j APOC
• Custom procedures
• Recommendation
• Events suggestions
• Product suggestions
• Organise suggestions
That’s a wrap

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GraphTour - Albelli: Running Neo4j on a large scale image platform

  • 1. Running Neo4j on a Large Scale Image Platform Wouter Crooy & Ruben Heusinkveld 15-02-2018
  • 2. Who are we • Wouter Crooy – Solution Architect • Ruben Heusinkveld – Solution Architect • Neo4j Certified Professionals @wcrooy @rheusinkveld
  • 3. The photo organizer • Deliver well organized, easy to use and secure storage for all your images • Ease the process of selecting photos for creating photo products • Started as part of a R&D ‘Skunk works’ project
  • 7. The photo organizer – from photos to products
  • 10. The challenge • Replace legacy system with the new photo organizer • Move 1.3 PB of photos from on premise to cloud storage • Analyze & organize all photos (511 million) • Data cleansing while importing • Using the same technology / architecture during import and after • Ability to add features while importing • Core of the systems are built in .NET
  • 11. The import • Hard deadline • Factory closing that holds the data center with all photos • Started 1st of April • Minimum processing of 150 images / second • ~500 queries / second to database (Neo4j) • Up to 700 EC2 instances on AWS
  • 13. How we did/do it • Micro services • Command Query Responsibility Segregation (CQRS) • Neo4j • Multiple write nodes • Single master read only nodes • Serverless (AWS Lambda)
  • 14. Architecture Neo4j Cluster HaProxy Query Command Frontend Amazon ElastiCache Photo processors Other Services • Notifications • Authentication • .... Preview Generation Storage Other database (clusters)
  • 15. Why we choose Neo4j • Close to domain model • Not an ordinary (relational) database • Looking for relations between photos/users • Scalable • Flexible schema • Natural / fluent queries • ACID / data consistency
  • 18. Graph model User Photo BelongsTo Photo Day Day Month Year DateTaken Day Month DateTaken Day Time line Year HasTimeline BelongsTo
  • 20. Our Neo4j database • More than 1.4 billion nodes • 4.6 billion properties • 3.7 billion relations • Total store size of 890 GB
  • 21. Improve your model • Training • Neo4j on Slack • Support engineers • Query planner • Query logging (use with care!) dbms.logs.query.allocation_logging_enabled=true dbms.logs.query.time_logging_enabled=true dbms.logs.query.page_logging_enabled=true
  • 23. Command Query Responsibility Segregation • Seperation between writing and reading data • Different model between Query and Command API • Independent scaling UI Cache DB Component Component Update Publish Write Query Command
  • 24. CQRS Seperate Reads & Writes • No active event publishing in place • Specific scenarios for updating / writing data • Ability to create seperate model for read and write • Updates (pieces) of the user graph • Requires reliable and consistent read • Scale out -> overloading locking of (user) graph • After import • Low performance scenarios -> cache with lower update priority
  • 25. Read after write consistency • All reads should contain the very latest and most accurate data • Replication delay between servers • Split on consistency • Article by Aseem Kishore: • https://neo4j.com/blog/advanced-neo4j-fiftythree-reading-writing- scaling/
  • 26. Graph locking • Concurrency challenge • Scale-out => more images from the same user • Manage the input • High spread of user/image combination • Prevent concurrent analysis of multiple images from the same user
  • 27. Graph design considerations • Property scan • (User)<-[:BelongsTo]-(Photo) • More photos • Property search => full-graph-scan • Differentiating property • Create node • Making changes to the schema…. • For 550+ million nodes
  • 28. Managing a (very) large graph • Finding the sweet spot between cluster size • Make sure the reads are busy enough • More nodes => more load on write master • Optimal memory vs graph store size • 1:1 • We are not afraid of polyglot persistency • We moved EXIF data to document store (DynamoDB) • User tend to upload photos in (big)batch • Manage input to prevent race conditions • Simultaneous creation of nodes => more concurrent locking of the user graph
  • 29. Managing a (very) large graph (2) • APOC (Periodic Iterate / Commit) (550mln photos) • Adding labels to nodes to be updated => 120 minutes • Adding additional relation, removing of additional label => 3 minutes • Combining writes if possible for faster write performance • APOC Do When
  • 31. The future • Upgrade to Neo4j 3.3 • Neo4j APOC • Custom procedures • Recommendation • Events suggestions • Product suggestions • Organise suggestions