[Go-essp-tech] [esg-node-dev] Data Node 404 Error
Estanislao Gonzalez
gonzalez at dkrz.de
Fri Dec 16 09:32:55 MST 2011
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
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