Strange problem in production

rubyonrails-talk
1

let's say I have some authors and update their books list (very complicated algorithm).

Everything works great in development mode, however in production mode the id's get mixed, the books get assigned to the wrong author (maybe if 2 or more requests happen in the same time), like somehow they share some variables. This is not happen in development mode (same conditions).

Any idea why this can happen?

Thanks, Al

2

Hey AD, I am not sure here, but i suspect might this is the problem, concurrency. just check with some sample application with small data set.

P.s: As i said i am not sure.

3

of course it is concurrency, but why? I can't avoid this, the request came from the web, so obviously I somehow use some kind of static variable shared between processed, only I don't even know if static variables exists...

The main hint can be that is happen only in production mode, so I'm still looking for an idea.

Thanks, Al

4

Have you written your tests and do they pass?

Rein

5

I don't have :frowning:

But I found the answer (not yet the error) in an old post of javier ramirez:

of yep.. when you are in development mode, the classes (most of them anyhow) get reloaded at each request. This means the code is reinterpreted every time and that's why: a) you don't need to restart so it's cool to try things quickly, and: b) it's much slower than running in production mode.

When in production, the classes get interpreted when loaded, and they are not reinterpreted every time. That's why you need to restart the server when you change the code. This means the class variables will keep their values between calls unless you modify them explicitely.

Now I need to find the error.

Thanks

6

Hi,

Now I need to find the error.

it looks like the error could be in the use of class/global variables. Look for cattr and for $ in your classes (and i hope you are not doing that, but look also for $ in your views). Class attributes and global variables are shared for the whole process (meaning your mongrel/webrick).

good luck,

javier ramirez