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Normally people look at logs when things go wrong. Do you look at the log anytime something starts successfully and seems to be working? You must spend lots of time looking at logs.

This is a message that MUST be displayed on the console when you install the server for the first time. It's too important.

Also, you learn a tool before going into production. I never went into "production" with mongodb. All I did was experiment with a toy project. I never needed to look at the log.




Do you look at the log anytime something starts successfully and seems to be working?

When I first install something new that I'm going to rely on - yes.

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How do you know that you're going to rely on it if it's new?

I install something new. I kick the tires. It takes a long time until I decide I'm going to rely on it. I'll look at the log at some point, but not necessarily the first time I install something. There are better things to do at that point.

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Maybe you should learn something from your failure.

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Maybe you should make constructive comments instead of making assumptions about what people learn or don't (or what they know or don't, or what has worked for them or hasn't).

There are some really disrespectful people in this community.

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> There are some really disrespectful people in this community.

Your article begun and ended with sarcastic remarks about the product. Realistically, what kind of response did you expect? The issues described in your article are very real, and very worthy of repeated discussion, but the article itself eschews discussion in favor of pontification, sarcasm and flamebait.

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I didn't say you didn't learn anything. But you seem to be making excuses for why you shouldn't know some very basic things about MongoDB. It uses a memory-mapped file. How can that be larger than 2GB in 32-bit system?

It has async writes...this is pretty well documented by 10gen and is also something noted by a lot of tutorials, blog articles etc. You should have known something this basic about a database so important to your business.

None of that would bother me in the slightest if you were not still here defending such basic mistakes and blaming them on 10gen.

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Come on, database (or any other system) that just silently fails to add new data?

2GB limit is clearly mentioned in the logs, that's fine, but anyone that sees this would expect that DB would start "screaming" loudly wherever it can (logs, response to the user on EVERY communication with the server, during any select,insert and others) that it reached this limit.

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Async writes are async, so there cannot be a response to the user on failure unless you explicitly check(getLastError). This is very well documented behavior.

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So important to my business? What business are you talking about? You are just confused.

All this time I've been talking about a toy app that I wrote to kick MongoDB's tires. If you don't understand that, there is no point in having a conversation.

I never had or have any plans to use MongoDB for any business.

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Sorry, you are right I conflated your article with another one referenced in the submitted post. I feel at least as stupid as I am, I can assure you.

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You have been a "technology manager" at Bank of America in North Carolina since 1998. Do you try new technologies such as MongoDB professionally? What are your qualifications to make such a vague statement? More importantly, what is the lesson to be learned?

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I made them in other replies, sorry for being so opaque.

The fact that a 32-bit memory-mapped file is limited to 2GB is basic comp-sci. It is also reported by MongoDB everytime it starts. Furthermore it is noted in the 10gen docs in several places.

Async writes...also extremely well documented.

So the failure here is two things: failure to properly research and understand a technology critical to their business. And then failure to take personal responsibility for the first failure, and instead to blame the vendor for not building a tradition DBMS despite the documentation about the stark differences.

I use MongoDB in a side-project if that is important to understand.

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You do know he sold search and indexing startup to LinkedIn, including a custom storage backend?

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Then this whole post sounds like a non issue. You couldn't be bothered to even look at the log file for your app because it wasn't important enough, then you shouldn't be irate when it doesn't work as expected.

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Every time I start something I tail -f the relevant log to make sure it starts correctly. Think of it as isolating a possible failure point as a sanity check.

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It's also on the download page.

http://www.mongodb.org/downloads

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