openstack team mailing list archive

[Hua ZZ Zhang <zhuadl@xxxxxxxxxx>]

>> 2) The basic idea is that an object server (via middleware or otherwise)
will be given the ability to respond to a request to indicate ‘not me but I
know who should handle this’.  I’m thinking this makes more sense as a 5xx
response with additional information (partition, nodes) about the route
included in the response body (as opposed to a 3xx code)

My concern is that 5xx response is a kind of error that occurs on server
side. The server can't handle the client request
due to internal error (500), not implemented (501), bad gateway(502),
service unavailable(503), gateway timeout(504)
or http version not supported(505).  It doesn't make much sense to use it
in your context of 'not me but I know who should handle this’.

I'm also curious about how could this happen if the object URL is the
unique identity. How does the server exactly know what client
request is another object? Based on what kind of information?
                                       
 Edward Zhang(张华)                    
 Advisory Software Engineer            
 Software Standards & Open Source      
 Software                              
 Emerging Technology Institute(ETI)    
 IBM China Software Development Lab    
 e-mail: zhuadl@xxxxxxxxxx             
                                       
                                       
                                       
                                       





                                                                           
             "Luse, Paul E"                                                
             <paul.e.luse@inte                                             
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             Sent by:                  "openstack@xxxxxxxxxxxxxxxxxxx"     
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             s                                                             
             +zhuadl=cn.ibm.co                                     Subject 
             m@lists.launchpad         [Openstack] [Swift] Storage Server  
             .net>                     Redirection                         
                                                                           
                                                                           
             2013-06-01 上午                                               
             07:53                                                         
                                                                           
                                                                           




I’m looking at tacking this item:





https://blueprints.launchpad.net/swift/+spec/support-storage-server-redirects






and wanted to get some feedback on the following observations/thoughts:





1) This is a capability that would be checked in independent of other
blueprints that might use it (2 are mentioned in the link above) and unit
test code would be the only way to initially exercise it; it essentially
enables other activities at this point





2) The basic idea is that an object server (via middleware or otherwise)
will be given the ability to respond to a request to indicate ‘not me but I
know who should handle this’.  I’m thinking this makes more sense as a 5xx
response with additional information (partition, nodes) about the route
included in the response body (as opposed to a 3xx code)





3) The proxy server will be modified to process the response accordingly
but using the partition, nodes info from the response as opposed to
object_ring.get_nodes() to determine which nodes to use





4) Protection will be required to avoid endless redirection loops





5) This applies only to GET operations





Appreciate any thoughts/feedback.,  In addition to the two usages of this
capability referenced in the blueprint I think there’s applicable to
another Tiering blueprint which interests me as well.





Thanks


Paul


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