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Accumulo >> mail # dev >> a model for accumulo write scaling performance

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RE: a model for accumulo write scaling performance


That may be a good metric for your workload on EC2 virtualized hardware at
different scales; could be useful for regression testing different versions
of Hadoop + Accumulo. Certainly workload and hardware differences could end
up with a different model.


From: Aaron Cordova [mailto:[EMAIL PROTECTED]]
Sent: Friday, February 24, 2012 2:36 PM
Subject: a model for accumulo write scaling performance


In my experience with Accumulo on EC2, I've seen about an 85% increase in
aggregate write rate each time the size of the cluster is doubled. I've
tried to capture that behavior in a model to help myself understand it.


The model I came up with is the following:



            w: aggregate write rate (writes per second)

            m: number of machines

            k: standalone single server performance (in my experience about
30k writes per second on average)


the units of k and w are writes per second


for those of you without the ability to see graphics in email, the model is:


            w = m * pow(0.85, log(m, 2)) * k


First of all, my algebra may be rusty, so it may be possible to simplify the
model ... second, does the model make sense?