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

[Sébastien Denvil]

  Hi Estani,

I was not clear. I meant that part of the 404 Error could be due to a 
file permission issues.

Thanks for sharing your view.
Sébastien

On 16/12/2011 17:32, Estanislao Gonzalez wrote:
> 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
>>
>
>


-- 
Sébastien Denvil
IPSL, Pôle de modélisation du climat
UPMC, Case 101, 4 place Jussieu,
75252 Paris Cedex 5

Tour 45-55 2ème étage Bureau 209
Tel: 33 1 44 27 21 10
Fax: 33 1 44 27 39 02


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