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From Jason Frantz <jfra...@maprtech.com>
Subject Re: Jeff Dean on fast response in an unreliable world
Date Wed, 12 Sep 2012 01:54:43 GMT
Definitely agree with many of the points in the link.

The PowerDrill paper also mentions a variant of this where each query
fragment is sent to two machines, and the results for that fragment are
used from whatever machine responds first. So in that case it's not so much
a "cancel" as an "ignore".

On Tue, Sep 11, 2012 at 11:37 AM, Ted Dunning <ted.dunning@gmail.com> wrote:

> Headed into Thursday's meetup, this paper by Jeff Dean provides a very good
> description of strategies for getting fast response times with variable
> quality infrastructure.
> http://research.google.com/people/jeff/latency.html
> The key point here is that it is very important to have asynchronous
> queries with a cancel.  Above that level, there needs to be a simple
> strategy for pushing second versions of queries out to the workers and
> canceling defunct or redundant queries.

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