MongoDB Part 2
- 2. Admin UI There are a number of open source projects that provide an admin console to your MongoDB instances. Some are web UI and some are native UI applications. MongoHub is a native Mac OS app that has many great bells and whistles (my personal fav) MongoVUE is a native Windows .NET Many Ruby web based apps that run using Sinatra and MongoDB driver (Futon4Mongo, Mongo3, etc)
- 3. MongoHub details Retail time CRUD operations monitoring Multi-database views Detailed collection views Interactive querying MySQL Import / Export
- 4. Monitoring and Diagnostics The newer versions on MongoDB come with mongostat sudo mongosniff --source NET lo0 Could be straight forward to hook up custom Nagios alerts and monitoring with this data
- 5. Replication Old way < 1.6 New way >= 1.6
- 6. How it all works MongoDB has a primary node who does the writes The data is then replicated to the rest of the set MongoDB has auto fail-over so if the current primary pukes, then another node is "elected" A write is theoretically complete when a "majority" of the nodes in the set received the data ma·jor·i·ty noun mə-ˈjor-ə-tē In MongoDB terms it means there is at least 1 primary and at least 1 other node running If only 1 node is left standing...well that sucks
- 7. The Ugly Truth If a node fails-over during replication and all the nodes haven't received it... The data drops ;..(
- 8. MongoDB Make Believe Land Node 2 Node 3
- 9. MongoDB Make Believe Land Node 2 Node 3
- 10. MongoDB Make Believe Land Node 2 Node 3
- 11. MongoDB Make Believe Land Node 2 Node 3
- 12. How do I set that up? Well, its super hard... ...NOT to do it right I <3 MongoDB documentation http://www.mongodb. org/display/DOCS/Replica+Set+Tutorial You can also do N nodes and 1 arbiter, where N % 2 == 0
- 13. "Shards are the secret sauce..."
- 15. Shards Shard 2 Shard 1 Node 2 Node 3
- 16. Choose wisely! > When sharding you must choose your shard key wisely for an even distribution of load and data > It's best to choose composite shard keys and determine the most common queries > Helps ensure your query targets a single shard vs. querying ALL shards
- 17. Map / Reduce
- 18. Map / Reduce > You can write map/reduce functions in the shell and with any of the supported MongoDB drivers
- 19. Logging with MongoDB Got this link from the MongoDB meetup at Engine Yard this past week. Thanks to Robert Stewart for the great presentation: http://www.slideshare. net/WombatNation/logging- app-behavior-to-mongo-db