@kristina
for some reason wordpress wanted me to moderate your post so sorry for the delay in it showing up.
>> Whoopsy, got your emphasis wrong there ….. Seriously, though, this “unchecked” type >> of write is just supposed to be for stuff like analytics or sensor data, when you’re getting >> a zillion a second and don’t really care some get lost if the server crashes.
did the default change? the last time i attempted to a concurrent performance test this was one of the barriers i hit. my issue isn’t that you include this feature, it’s that it’s the default, i certainly believe there is a use case for it i just think it’s harmful as a default.
>> Since CouchDB is “not a competitor” to MongoDB, it’s nice of you to put all this time >> into a public service.
haha, that’s funny. i regularly use non-CouchDB databases and I get along great with all the people from other databases at conferences. even if i did feel like we were competing, i wouldn’t care. this post really is about reliability issues i don’t think your users are fully aware of and i honestly hope that you fix.
>> fsyncs are configurable. You can fsync once a second, never, or after every single insert, >> remove, and update if you wish.
that’s really good to hear. have you optimized for a “group commit” yet?
>> This is because you assume you’ll run it on single server. MongoDB’s documentation >> clearly, repeatedly, and earnestly tells people to run MongoDB on multiple servers.
I responded earlier to the complexity of actually keeping something available that depends on this. so i won’t cover it again.
>> That’s not to say that things never go wrong, MongoDB is definitely not perfect and has >> lots of room for improvement. I hope that users with questions and problems will >> contact us on the list, our wiki, the bug tracker, or IRC (or, heck, write a snarky blog >> post). Anything to contact the community and let us try to help. I wish every person >> who tried MongoDB had a great experience with it.
You make it sounds like this is all just a matter of bugs, it’s not, and i find blaming it on users who don’t use JIRA or get on IRC a little distasteful.
these issues are architectural and until you do something append-only they aren’t going to go away. someone mentioned earlier that you plan to do an append-only transaction log, if that’s accurate then it’s fantastic news.