error_logger, full RAM consumption

[Suhail Doshi]

Has anyone experienced running mochiweb and having the server after some time consume 4 GB of the total server's ram with the error_logger process having the largest stack+heap size in the crash dump?

The problem would be easy to solve if I could simply find a gradual leak in memory but what is odd is that it instantly consumes all the memory in one giant spike making it hard to track down.

Sincerely,

Suhail

--
http://mixpanel.com
Blog: http://blog.mixpanel.com

[Suhail Doshi]

This was resolved by updating to a newer erlang version.

Suhail

[Anton Krasovsky]

I've had similar problem with error_logger trying to format/print
message containing large binary and running out of memory in the
process. That wasn't related to mochiweb though.

Anton

[Suhail Doshi]

It sounds like then that if someone POSTs large enough data to a mochiweb server it'll just tank then? What's a counter measure to reject data that's say above 1 M large?

Suhail

[Suhail Doshi]

Also, I have actually tried turning off error_logger with the problem still persisting

Suhail

[Bob Ippolito]

It won't even read the data off the socket unless you do something
that starts reading it, and the default functionality will exit if the
body is more than 1MB (e.g. anything that ends up at recv_body()). If
it's reading more than 1MB off the socket, it's almost certainly your
code and not mochiweb.

On Mon, Oct 12, 2009 at 8:56 PM, Suhail Doshi <digital...@gmail.com> wrote:

[WARC]

Hi !

Is there a doc or examples about how to create, update, and delete
cookies during a Mochiweb session?

Thanks

[Anton Krasovsky]

Well, there is not much to it:

1. Get cookie from request: Req:get_cookie_value(?COOKIE)

2. Reply of some sort 302 in this case with Set-Cookie in the header:

Req:respond({302, [{"Location", Location},
{"Content-Type", "text/html; charset=UTF-8"},
mochiweb_cookies:cookie(?COOKIE,
Cookie, [{path, "/"}])
], ""})

3. Same as above but expire the cookie:

Req:respond({302, [{"Location", "/"},
{"Content-Type", "text/html; charset=UTF-8"},
mochiweb_cookies:cookie(?COOKIE, "expired",
[{path, "/"}, {max_age, 0}])
], ""}).


Anton