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From David Schoonover <david.schoono...@gmail.com>
Subject Re: Cassandra benchmarking on Rackspace Cloud
Date Mon, 19 Jul 2010 17:35:27 GMT
> Another thing: Is the py_stress traffic definitely non-determinstic
> such that each client will generate a definitely unique series of
> requests? 

The tests were run both with --random and --std 0.1; in both cases, the key-sequence is non-deterministic.

Cheers,

Dave



On Jul 19, 2010, at 1:30 PM, Peter Schuller wrote:

> Another thing: Is the py_stress traffic definitely non-determinstic
> such that each client will generate a definitely unique series of
> requests? If all clients are deterministically requesting the same
> sequence of keys, it would otherwise be plausible that they end up in
> effective lock-step, if the bottleneck is serialized but the result of
> it goes out in parallel to all clients.
> 
> (This is probably not the case but I'm not sure off hand about whether
> there is anything in Cassandra's implementation that might be
> compatible with this hypothesis, in terms of how concurrent requests
> for the same key will be handled.)
> 
> -- 
> / Peter Schuller


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