http://ayende.comAyende @ RahienCopyright (C) Ayende Rahien 2004 - 2021 (c) 202660... and please take into consideration that kiip's MongoDB was doing about 2000 updates per second together with an unknown number of concurrent reads (http://blog.engineering.kiip.me/post/14317098482/ec2-to-vpc-executing-a-zero-downtime-migration) so the global lock is there probably because without it the database would be just too fast http://ayende.com/156129/re-kiip-s-mongodb-s-experience#comment6http://ayende.com/156129/re-kiip-s-mongodb-s-experience#comment6Sun, 15 Apr 2012 19:15:23 GMTI don't think you can tell that RavenDB would be a better choice for Kiip - there's too little information. Every database is a good choice until you reach the limits of performance or functionality and then strange things can happen. But the most funny part for me is that they migrated from MongoDB to PostgreSQL... Probably they'd be better off using Postgres from the beginning. http://ayende.com/156129/re-kiip-s-mongodb-s-experience#comment5http://ayende.com/156129/re-kiip-s-mongodb-s-experience#comment5Sun, 15 Apr 2012 18:37:45 GMTWhen will ravenhq go live? Atm they are asking me to use Appharbor.http://ayende.com/156129/re-kiip-s-mongodb-s-experience#comment4http://ayende.com/156129/re-kiip-s-mongodb-s-experience#comment4Sun, 15 Apr 2012 16:00:03 GMTOffline table compaction and a global write lock are just things make me wonder what they thought. SQL Server would be unsellable with such limitations. For the same reason SQL Server has rock-solid online backup and online index operations. You can't just tell a billion dollar corporation that its sales website will be down for maintenance regularly. It needs to be up always. That just doesn't fly. http://ayende.com/156129/re-kiip-s-mongodb-s-experience#comment3http://ayende.com/156129/re-kiip-s-mongodb-s-experience#comment3Sun, 15 Apr 2012 11:31:21 GMTSafe by Default, Transactions, and lack of a global write lock are why I went with RavenDB instead of MongoDB. Moreso Transactions than anything else. While Mongo has atomic document editing, there are many times I need to edit 2 documents at the same time (think 2 characters in a game trading items).http://ayende.com/156129/re-kiip-s-mongodb-s-experience#comment2http://ayende.com/156129/re-kiip-s-mongodb-s-experience#comment2Sun, 15 Apr 2012 11:20:09 GMTMakes me appreciate the relatively little pain I've had with RavenDB running a live production website for the past two months. The only issue I've had production wise, which pales into comparison of Kiip LOOSING data, was a VPS restart that messed up the indexes (always stale and missing results) and they had to be manually reset. We lost no data and the website stayed online whilst we reset the indexes manually (this issue is now fixed as well). I appreciate choosing RavenDB even more after reading Kiip's blog post. Yikes! http://ayende.com/156129/re-kiip-s-mongodb-s-experience#comment1http://ayende.com/156129/re-kiip-s-mongodb-s-experience#comment1Sun, 15 Apr 2012 11:15:42 GMT