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Mongo DB at Community Engine
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Mongo DB at Community Engine


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This presentation was delivered by community engine Lead Platform Engineer Mathieu Kempe at the recent Mongo DB conference in Sydney.

This presentation was delivered by community engine Lead Platform Engineer Mathieu Kempe at the recent Mongo DB conference in Sydney.

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  • Brain dump on why we started to use MongoDB Why we moved away from a solution using MongoDB and SQL Server
  • Moved to this infra
  • If the primary crash we have the data in at least one of the secondary Second node has priority greater than or equal to other eligible nodes in the set
  • Update is different as we do sometime Update in place Update in place are a query and an update in one command
  • Transcript

    • 1. MongoDB atCommunity Engine
    • 2. About meLead platform
    • 3. AgendaBrain dump on our experience with MongoDB• Why NoSQL• Why we chose MongoDB• Moving away from an hybrid solution• MongoDB and Amazon• SOLR and MongoDB• Ease of development• Zero downtime database deployment
    • 4. About Community Engine• Social network based on locality and small business• Launching in April• Built on: • ASP.NET MVC 3 • Amazon Web services • MongoDB • SOLR • Mahout • …
    • 5. NoSQL?• How to store the big amounts of data required in social networking applications• Data complexity, NoSQL handle hierarchical and graph data structures better• Change management is always difficult with RDBMS• Scaling
    • 6. Why we chose MongoDB?• Reviewed different products RavenDB, CouchDB...• Selected MongoDB because we had the best experience – Very easy to install and get started – Great developer experience – Replication very easy to setup – Good documentation – Much of the convenience of SQL, Dynamic Queries, Indexing
    • 7. Why Hybrid?• Team had a lot of experience with SQL Server and Entity Framework• Reporting• Transaction
    • 8. No more SQL Server• Simplify our infrastructure• Easier to Backup• Better performance, not slowed down by SQL Server, too many queries joined in the application• Development speed• Lower cost
    • 9. Transaction?Transactions we could go around that using the atomic document updates and a good schema designMongoDB supports atomic operations on single document.When transactions across documents are neededTwo phase commits
    • 10. Hosting with Amazon Web Service• Elasticity and scalability• Configure MongoDB using Amazon EC2 instance bundled into an AMI.• 64 bits EC2 instance• Raid10 + EBS volumes• Multi-datacenter 3-node replica set in different availability zone• Use secondaries for zero downtime backup• We are not yet using sharded replica sets
    • 11. What about durability?Use journalingUse replica sets
    • 12. Critical writesVerify that replication is working at write timemongodb://host1,host2,host3/?safe=true;w=2;•safe=true : Use safemode•w=2: wmode, connect to a replica set waiting forreplication to succeed on the majority of nodes
    • 13. Why we kept SOLR?• Right tool for the right job• Proven technology• SOLR best solution for Full Text Indexing• Faceted search, Spelling suggestions…• Team already skilled with SOLR• SOLR scales well
    • 14. MongoDB/SOLR How we do it
    • 15. MongoDB/SOLR How we do it
    • 16. MongoDB/SOLR How we do it
    • 17. MongoDB/SOLR How we do it
    • 18. MongoDB/SOLR How we do it
    • 19. Ease of development
    • 20. Hierarchical data in SQL Server
    • 21. Single table
    • 22. Mongo Database SchemaUsing Type discriminator{ "_id" : ObjectId("4f504e7acd3e1c190ce04198"), "_t" : "PhotoSpark", "Photo" : "MyMotorcycle.png " "DateCreated" : ISODate("2012-02-24T09:23:12.246Z")}{ "_id" : ObjectId("4f504e7ccd3e1c190ce04199"), "_t" : "PostSpark", "Body" : "Hello World“ " DateCreated" : ISODate("2012-02-28T10:44:12.858Z")}
    • 24. Deployment of database with zero downtime• We release every week• We aim at zero downtime• Our domain model change often
    • 25. Deployment of database with zero downtimeMake sure that our code can handle both "versions" of the data structureWhen saving we updates to the new structure
    • 26. Deployment of database with zero downtime• Use a migration script
    • 27. Deployment of database with zero downtime Expansion Script Deploy new version Compression Script t
    • 28. Questions?
    • 29. Thank you!