Databases
StackOverflow2013
Postsdbo
POIntermittent Error 500 (concurrent request?)
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POIntermittent Error 500 (concurrent request?)
    primarykey
    data
    text
    <p>I have a web server with classic apache-nginx for heavy and static traffic. In apache webserver, I use mod_rewrite for clean ugly urls and process php vía mod_fcgid. All works fine, but I have Intermittent Error 500 on <strong>only some</strong> requests, occasionally. </p> <p><strong>NOTE:</strong> Error 500 not logging on error.log (not a PHP error), I assume that is a configuration problem (mod_fcgi? mod_rewrite? apache maxclients?).</p> <p>I see logs and found that error 500 appears with near requests on time, repeated same URL ( coincidence?). Some examples with 200/500 error:</p> <pre><code>88.27.x.x [28/Dec/2012:18:57:12 "GET /permalink/title-clean-url-1 200 88.27.x.x [28/Dec/2012:18:57:12 "GET /permalink/title-clean-url-1 500 88.1.x.x [28/Dec/2012:16:12:32 "GET /permalink/title-clean-url-2 200 88.1.x.x [28/Dec/2012:16:12:34 "GET /permalink/title-clean-url-2 200 88.1.x.x [28/Dec/2012:16:12:37 "GET /permalink/title-clean-url-2 500 200.5.x.x [28/Dec/2012:11:41:00 "GET /permalink/title-clean-url-3 200 200.5.x.x [28/Dec/2012:11:41:00 "GET /permalink/title-clean-url-3 500 83.46.x.x [28/Dec/2012:10:55:00 "GET /permalink/title-clean-url-4 500 83.46.x.x [28/Dec/2012:10:55:00 "GET /permalink/title-clean-url-4 200 200.38.x.x [29/Dec/2012:01:55:24 "GET /permalink/title-clean-url-3 500 69.171.x.x [29/Dec/2012:01:55:25 "GET /permalink/title-clean-url-3 200 178.33.x.x [29/Dec/2012:04:48:12 "GET /permalink/title-clean-url-5 500 178.33.x.x [29/Dec/2012:04:48:12 "GET /permalink/title-clean-url-5 200 201.151.x.x [29/Dec/2012:12:05:31 "GET /permalink/title-clean-url-3 500 79.144.x.x [29/Dec/2012:12:05:34 "GET /permalink/title-clean-url-3 200 83.46.x.x [29/Dec/2012:11:11:13 "GET /permalink/title-clean-url-3 200 83.46.x.x [29/Dec/2012:11:11:13 "GET /permalink/title-clean-url-3 500 83.46.x.x [29/Dec/2012:11:11:34 "GET /permalink/title-clean-url-3 200 83.46.x.x [29/Dec/2012:11:11:34 "GET /permalink/title-clean-url-3 200 </code></pre> <p><strong>EDIT:</strong> I think that, maybe, high traffic for webserver overthrow apache. I create script for count requests every minute on day 28 (format: <em>HOUR:MINUTE, requests count on this minute</em>). Errors appears in 11:41, 12:05, 16:21 and 18:57, and not appears high traffic on this minutes (in other moments there are more heavy requests). Can anyone check this analysis?:</p> <p><a href="http://pastie.org/5593294" rel="nofollow">http://pastie.org/5593294</a></p> <p>Does anyone know where I can continue investigate?</p> <p><strong>EDIT2:</strong> I see that on Apache 500 errors are redirected from nginx with 499 error (nginx client close connection). I can solve this?</p> <p>Very thanks,</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USManz
    1. USManz
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COLooks like a loop. Typical cause of most 500 errors. Checking the rules is the only way to find out what's going on, post them if possible.
      singulars
      1. POIntermittent Error 500 (concurrent request?)
      1. USFelipe Alameda A
    2. CONot loops in error. I put rewritelog and don't see errors or loops. URL works fine (I think that a loop fail always, this error appears only sometimes)...
      singulars
      1. POIntermittent Error 500 (concurrent request?)
      1. USManz
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload