[tahoe-dev] detecting weak uploads and share rebalancing Re: Share rebalancing

Zooko Wilcox-O'Hearn zooko at zooko.com
Sat Oct 10 23:36:20 UTC 2009


On Saturday,2009-10-10, at 16:01 , Shawn Willden wrote:

>> Also Kevan Carstensen's implementation of #778 would make it so  
>> that those uploads are reported as failing
>
> It would cause the uploads to fail, which is good, but it would  
> also lose my careful selection of FEC parameters.

Hm, are you thinking of #791?  It began life as #778, but calved off  
into its own ticket.

The patch that Kevan has written for #778 would cause weak uploads to  
fail, as you desire, without changing your FEC parameters.  However  
the current version of his patch has a problem -- in certain unusual  
edge conditions it could cause a strong upload to fail.

> In any case, the more important part of my question was how to fix  
> the present problem, rather than how to avoid it in the future :-)

Ah, yes.  So the process you described sounds like it would work, to  
me, but for immutable files there is an easier way -- just copy the  
share files to other servers.  :-)

Regards,

Zooko

http://allmydata.org/trac/tahoe/ticket/778 # "shares of happiness" is  
the wrong measure; "servers of happiness" is better
http://allmydata.org/trac/tahoe/ticket/791 # Optimize FEC parameters  
to increase download performance



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