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Hi Matevz,

We of course use extended attributes. If hadoop doesn't naturally have them, 
you can write your own implementation using XrdSysFAttr as the template like 
we do for implementing each different file system interface, sigh.

Andy

-----Original Message----- 
From: Matevz Tadel
Sent: Thursday, October 04, 2012 7:07 PM
To: Andrew Hanushevsky
Cc: xrootd-dev
Subject: Re: Getting checksum from a server

Hi Andy,

Thanks! I never looked into this part of docs before so I naively expected 
that
checksums can always be obtained / recalculated on demand. I guess I'll live
without them for now :)

Out of curiosity, how do you store such meta information? It seems 
problematic
for file-systems like hadoop?

Matevz

On 10/04/12 18:54, Andrew Hanushevsky wrote:
> Hi Matevz,
>
> Please read the documentation on how to configure a server to provide 
> checksums.
> The message says it all, the server was not configured to do it.
>
> a) http://xrootd.org/doc/dev/xrd_config.htm#_Toc336083799
>
> b) (optionally) http://xrootd.org/doc/dev/ofs_config.htm#_Toc323059149
>
> Andy
>
> -----Original Message----- From: Matevz Tadel
> Sent: Thursday, October 04, 2012 6:45 PM
> To: xrootd-dev
> Cc: Jeff Dost
> Subject: Getting checksum from a server
>
> Hi,
>
> How can I get a checksum from a server? I tried using XrdClientAdmin but I 
> get
> this printed out when calling admin->GetChecksum():
>
>   121004 18:42:10 13529 Xrd: CheckErrorStatus: Server [xrootd.unl.edu] 
> declared:
> query chksum is not supported(error code: 3013)
>
> so it seems this is a dead end. Any other options?
>
> Matevz
>
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