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![ .NET static type system + MongoDB dynamic
schema is like mixing Simon and Garfunkel
…(it can be great if you don’t Garfunkel it up)
Driver allows for pure dynamic schema
interaction but is maturing to allow type safe
access via Lambdas and LINQ.
◦ Aggregation framework tbd [CSHARP-601]](https://image.slidesharecdn.com/mongoconf2013volusion-130225112736-phpapp01/75/Lessons-Learned-from-Building-a-Multi-Tenant-Saas-Content-Management-System-on-Mongo-with-C-11-2048.jpg)
![ LINQ support is great. Just know that:
◦ No projection [CSHARP-456]
◦ Hard to mix in dynamic schema elements (use Inject
extension method)
Fall back to
MongoDB.Driver.Builders.Query<T> or
QueryBuilder<T>
◦ Mix in dynamic schema elements via non-generic
version](https://image.slidesharecdn.com/mongoconf2013volusion-130225112736-phpapp01/75/Lessons-Learned-from-Building-a-Multi-Tenant-Saas-Content-Management-System-on-Mongo-with-C-18-2048.jpg)
Uploaded byMongoDB
Lessons Learned from Building a Multi-Tenant Saas Content Management System on Mongo with C#
The document introduces Kevin Wright and Jonathan Roeder, who both have experience with MongoDB. It then provides information about their company, which has been in business since 1999 and processes $2.8 billion annually on its ecommerce platform. It goes on to describe their multi-tenant CMS application built with .NET and MongoDB, including approaches taken for schema design, sharding implementation, and best practices.
In this document
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Introduction of presenters Kevin Wright and Jonathan Roeder, highlighting their experience and roles in the company.
Company founded in 1999, providing SaaS eCommerce services, with 40,000+ online stores and $2.8B processed in 2012. Fun aspects of company culture noted.
Discusses the need for a new multi-tenant service focused on efficient scaling and CMS functionality through a .NET REST service.
Initial MongoDB provisioning issues led to reinventing database management. Introduced sharding for better scalability.
Strategies for using .NET static types with MongoDB's dynamic schema. Discusses leveraging compile-time safety and serialization.
Advice on using static types, LINQ support complexities, update best practices, and data modeling considerations without traditional joins.
Emphasis on denormalization with pro and cons. Discusses how folder paths are managed within content documents to ease updates.
Focus on optimistic concurrency and issues like benign writes. Encouragement to engage and vote on solutions discussed.
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Lessons Learned from Building a Multi-Tenant Saas Content Management System on Mongo with C#
- 1.
- 2. Kevin Wright (The long-haired hippie one) ◦ Over 100 years of experience! (Just look at this PowerPoint Template!) ◦ Worked on the Space Station! ◦ 2 years of Mongo experience Jonathan Roeder (The short-haired hipster one) ◦ 10 years of High Scale eCommerce / CMS / Search ◦ 1.5 years of Mongo experience
- 3. Founded in 1999 SaaS eCommerce and related services 40,000+ Online stores 330+ Employees $2.8B processed on our platform in 2012
- 5. Dog Fridays Guys in suspenders!
- 6. Just who are you guys?
- 7. WHY write one? Theworld needed ONE MORE!?! Critical focus on Multi-Tenancy Focus on Small footprint / Efficient scaling
- 8. What it is: .NET REST Service Standard use case of enabling CMS users to define Meta schemas (Content & Property Types) CRUD operations on Data that conforms to the Meta schemas (Content) Structures for organizing Content (Content Lists and Folders)
- 9. Initial approach programmatically provisioned a Mongo Database for each Tenant. Reinventing the wheel with database management. Suffering from two minute incremental boot up time per Database was untenable (get it!). New approach: Embrace Sharding as the appropriate scale out approach
- 10. Opt-in per Collection Don’t do it to earn your Sharding merit badge Read the documentation three times. Implement four times. (a.k.a Prototype) The Along Came Polly joke will never get old
- 11. .NET static type system + MongoDB dynamic schema is like mixing Simon and Garfunkel …(it can be great if you don’t Garfunkel it up) Driver allows for pure dynamic schema interaction but is maturing to allow type safe access via Lambdas and LINQ. ◦ Aggregation framework tbd [CSHARP-601]
- 12. KEVIN WILL DEMO Mongo SHELL MONGOVUE LINQPAD
- 13. Be as static as you can be. ◦ POCO types for each MongoDB Document schema (Data Transfer Object, DTO pattern) ◦ Leverage compile-time safety. The newest driver makes it easy with Generics and Lambdas ◦ Duck-typing and magic strings are for gooses! Explore very rich serialization hooks and levers ◦ (SetIgnoreIfNullConvention, BsonExtraElements,…)
- 17. Now that you’ve created static types, leverage them!
- 18. LINQ support is great. Just know that: ◦ No projection [CSHARP-456] ◦ Hard to mix in dynamic schema elements (use Inject extension method) Fall back to MongoDB.Driver.Builders.Query<T> or QueryBuilder<T> ◦ Mix in dynamic schema elements via non-generic version
- 19. 3 HIT COMBO !!!
- 20. Laser focus your Updates
- 21. Be careful with the blanket Save method! ◦ Can’t stop it from Upserting ◦ Often overkill to replace entire Document
- 22. Data modeling without Joins Concurrency modeling without Transactions
- 23. Denormalize!
- 24. If your data can’t be dirty, don’t denoramlize Example: Store only the FolderId on Content Document instead of materialized Folder path ◦ Pros: Updates are easy! ◦ Cons: Queries are hard! ◦ When wanting to find Content within child Folders, must first query for all child Folders, then OR those IDs using the ‘In’ operator
- 27. MongoDB.org approaches for actually retrieving the Folders : http://docs.mongodb.org/manual/tutorial/m odel-tree-structures/
- 28. Optimistic Concurrency Benign Writes Benign Wrongs Compensate Be prepared to carefully think this through. http://blog.mongodb.org/post/475279604/ on-distributed-consistency-part-1 http://docs.mongodb.org/manual/tutorial/p erform-two-phase-commits/
- 29. Vote!