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#mongodb logs for Sunday the 13th of December, 2015
[12:50:50] <StephenLynx> GothAlice now that WT is the default engine, you think those issues you seen were fixed? are you using WT?
[13:20:36] <C0nundrum> in my program i want to check if an item exists using find and then add or update it using save(). How would i make it so that multiple processes don't end up adding entries between find and save ?
[13:31:50] <C0nundrum> Well a unrelated question i have is i want to write a ecomerence site and i was going to use mongodb. Hoever after hours of reading, everywhere points to the downside of mongodb not supporting ACID. And that hacking toghether a solution at the application level makes projects unmaintinable in the longrun ?
[13:33:54] <StephenLynx> if ACID is vital for your software, the effort of implementing these features might not pay off, depending on what you gain from using mongo.
[13:34:19] <StephenLynx> however, it is possible to implement these without making the software unmaintainable.
[13:37:01] <StephenLynx> IMO, unless you REALLY know what you would gain from mongo and you have enough experience with the platform you are using (node.js, right?) I wouldn't use mongo.
[13:37:27] <StephenLynx> otherwise you might end up writing spaghetti code trying to compensate the missing features you need.
[13:39:28] <C0nundrum> what would you recommend then for a a ecomernece site that doesn't really have bigData requirements but supports easy horizontal scaling. Thinking of deploying it on heroku
[13:44:06] <C0nundrum> Hm i will look into it. So about findandmodify the problem with that is that i don't want to waste resource populating and object before calling it is the a way atomize the findandmodify ?
[13:45:40] <StephenLynx> in a single operation the document is created and has a field atomically modified.
[13:48:37] <C0nundrum> So this wouldb't be possible right ? t1: check if exist t2: check if exist t1:insert document t1: modify document
[13:51:45] <StephenLynx> both t1 and t2 could try and create the document if they have to check for it before.
[13:54:56] <C0nundrum> Well yea i mean i want to avoid populating and object before call upsert as its exspensive.
[13:58:42] <C0nundrum> i mean on the appliaction level if i have 5 queries that run at the same time to check if an entry exists need only 1 to pass. At that point it will then do some intenstive tasks before it know what to set in the database. the calling findmondify twice be the correct option that way only on will pass the upsert ?
[14:13:24] <C0nundrum> so findandmodify doesn't have to set any fields right ? and only 1 of those addObject calls will reach line 9 ??
[15:06:12] <C0nundrum> StephenLynx, do you know and good mongo db Admin Uis ? I like Mongo Mangement Studio atm but would be nice to have one with built in anylytics thats user friendly.
[17:10:59] <Rashad> I can login using the credentials but whenever I try to modify or delete something, it returns: "Document not found!".
[17:20:56] <Rashad> Sure but its meaning is a unique value that distinguishes the document from the others.
[17:27:02] <StephenLynx> because it seems that if you provide it with something that is not an ObjectID, it doesn't do anything of the special behaviours
[17:37:32] <C0nundrum> StephenLynx my aggreation was working up until {$sort : { "$episodes.date" : -1 }}
[17:38:53] <C0nundrum> {"errormessage":"Mongo Error: exception: Error: command failed: {\n\t\"errmsg\" : \"exception: FieldPath field names may not start with '$'.\",\n\t\"code\" : 16410,\n\t\"ok\" : 0\n} : aggregate failed\n at Error (<anonymous>)\n at doassert (src/mongo/shell/assert.js:11:14)\n at Function.assert.commandWorked
[17:47:10] <GothAlice> StephenLynx: I'm evaluating 3.2 + WT today. So far things are looking promising; restore of a stock data template took 1/10th as long as expected.
[17:47:43] <StephenLynx> btw, do I have to change something to start using WT when upgrading from 3.0?
[17:51:07] <GothAlice> StephenLynx: A ha. Record lookup by _id is taking half a second. I need to set my slowms higher. :|
[17:52:02] <GothAlice> At least memory usage is fairly constant. No more "consume it all!" policy. ;P
[17:52:28] <StephenLynx> what about upgrading from 3.0? do I have to change anything if I never told which engine to use?
[18:03:32] <C0nundrum> what query would i use to check the difference between now and the date stored ?
[18:08:05] <GothAlice> If you have data in hand (i.e. a variable in your code), and data in MongoDB, you'll have to use your language's available tools to perform the calculation of difference. (I.e. difflib in Python.)
[18:09:26] <GothAlice> On the other hand, there are ways to structure how you store your data, and how you store updates to your data, that preserve the history, but that's still you, not MongoDB, helping you out.
[18:09:43] <C0nundrum> Also looking at the docs select the difference using db.sales.aggregate( [ { $project: { item: 1, dateDifference: { $subtract: [ new Date(), "$date" ] } } } ] )
[18:10:12] <C0nundrum> but how do i return the whole document without having to manually select every field manualy in project ?
[18:10:12] <GothAlice> Also… aggregate is typically compared against many values. It still doesn't make sense.
[18:11:31] <GothAlice> C0nundrum: https://docs.mongodb.org/manual/reference/operator/aggregation/project/#considerations
[18:12:57] <GothAlice> If you mark any fields for inclusion (1), it implies that non-marked fields aren't included. Simply remove your "item: 1" part of the projection to get all fields back, plus the one added as dateDifference. But this is a serious case of XY problem solving.
[18:15:04] <GothAlice> That feeling you're getting–it's telling you this is the wrong solution to whatever the problem is.
[18:17:38] <C0nundrum> its not that it isn't working for what i'm doing just trying to understand the api
[18:35:26] <GothAlice> Though I stressed the lights out of it, it didn't turn into grey goo like it did in prior tests.
[18:42:57] <GothAlice> StephenLynx: https://soundcloud.com/gothalice/metal-crusher?in=gothalice/sets/undertale ;) Now to explore the data storage differences. I'll be setting up a new production cluster next week, and I think I'll give WT a shot on it.
[19:15:51] <StephenLynx> GothAlice you know any condition where mongo would change the _id of a document for no good reason?
[20:10:14] <m3t4lukas> hey guys, I just installed kernel 4.2.0-19 on my MSI GE60 Notebook. Now wifi is not working anymore :/ rfkill shows only my bluetooth adapter and lshw shows an unclaimed Intel Wireless 3160 controller. Any ideas what my options are?
[20:11:42] <m3t4lukas> never mind, touchpad is weirdly misbehaving, too. Must have activated the mongodb channel