On 30 Nov 2012, at 00:04, Eric Wong wrote:
> Iñaki Baz Castillo <[email protected]> wrote:
>> I don't understand why the application on top of the HTTP/TCP layer
>> (so the Rails app) should be interrupted because the TCP connection is
>> closed prematurely. The HTTP layer (which involves a single TCP
>> connection for each HTTP request/response pair) is a layer below the
>> application layer, should not disturb the Rails app IMHO.
>>
>> Is this a design issue of Rails?
>
> I suspect the the only possibility is when Rails is reading the
> multipart response in a largish upload (any upload request which
> can't fit in socket buffers).
On the three occasions I've had this problem it's been a tiny request.
The user clicks an ordinary Rails delete link. This POSTs to a URL with two
parameters: an authenticity token and the _method.
The corresponding destroy action looks like:
def destroy
client = Client.find params[:id] # 1 (ignores soft-deleted records)
client.soft_delete # 2 (sets a deleted_at timestamp)
client.brands.each(&:destroy) # 3 (a client has many brands)
redirect_to clients_path
end
Nginx logged:
x.xxx.xx.xx - - [27/Nov/2012:14:40:28 +0000] "POST /clients/2248 HTTP/1.1"
499 0 "https://example.com/clients/2248/edit"; "Mozilla/5.0 (compatible; MSIE
9.0; Windows NT 6.1; WOW64; Trident/5.0)"
x.xxx.xx.xx - - [27/Nov/2012:14:40:29 +0000] "POST /clients/2248 HTTP/1.1"
404 592 "https://example.com/companies/2248/edit"; "Mozilla/5.0 (compatible;
MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)"
You can see the first request was terminated by the user. Hot on its heels the
user tried again and got a 404.
The 404 was triggered by step 1 above: the first request had successfully
soft-deleted the client. However the client's brands were still in the
database. The first request had executed steps 1 and 2 but not step 3.
Unicorn didn't log anything. Rails didn't log the first request but did log
the second.
I understand the steps to mitigate the problem...but I remain confused about
why the Rails app was interrupted because the TCP connection was closed
prematurely.
Yours,
Andrew Stewart
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