[Go-essp-tech] [esg-node-dev] Data Node 404 Error

[Estanislao Gonzalez]

Hi Sebastein,

from our side this is caused by too many connections to the server, but 
I can't speak for others. The resulting error "might" be a 404 but might 
also be a 403, depending probably on wht exactly was the last connection 
breaking it (not sure about that).

Our solution was limiting the number of connections per ip, but since 
people like jumping hurdles and start accessing from multiple machines, 
we might have to start limiting whole subnet masks, which will be very 
unfair for some... If I could find a better option I would.

This might not proof to be a perfect solution , since for whatever 
reason it might be, tools used for accesing our data node do not close 
connections properly and leave them Half-open. This "might" be solved 
from the server side when intentionally forcing the connection to be 
closed, probably by a GC task (I've also re-tuned the GC of tomcat 
hoping it will clean unused connections faster without bothering the 
huge TDS cache).

As I said, this is just our particular case.

Thanks,
Estani

Am 16.12.2011 17:16, schrieb Sébastien Denvil:
>  Dear CMIP5 data node administrators,
>
> from time to time ; when downloading data we encounter "ERREUR 404: 
> Not Found".
>
> It happened on our node for a few files. We had to perform the 
> following sanity command to be sure:
> chmod -R a+rX *
>
> Depending on your constraint the command may be more complex. For 
> example if the data are not readable by all users be sure that tomcat 
> belongs to the group able to read the data and be sure that the 
> corresponding group can read the data.
>
> It may seems absolutely obvious but the tomcat user needs to be able 
> to read the data. Sorry for such a trivial reminder but ... :-)
>
> Regards.
> Sébastien
>


-- 
Estanislao Gonzalez

Max-Planck-Institut für Meteorologie (MPI-M)
Deutsches Klimarechenzentrum (DKRZ) - German Climate Computing Centre
Room 108 - Bundesstrasse 45a, D-20146 Hamburg, Germany

Phone:   +49 (40) 46 00 94-126
E-Mail:  gonzalez at dkrz.de