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From Josh Elser <>
Subject Re: Maximum and recommended number of tablets per tserver
Date Tue, 27 Sep 2016 17:34:10 GMT
Hi Mario,

There is no perfect answer here. It's going to be dependent on your 
application latency requirements, data layout, and available hardware 

In general, we recommend "hundreds of tablets" per tabletserver. This 
should be a decent starting ponit. As you develop more and are able to 
run some experimentations with your application, you might find that 
more or less tablets are actually beneficial (for one reason or another).

I'm not sure what a maximum number of tablets would be per tserver. 
Probably 10's of thousands? It quite depends (again) on the hardware 
resources available. The master is also a single entity managing the 
assignment of each of those tablets -- eventually, just iterating over 
tablets will take more and more time in the Master. Additionally, each 
Tablet represents some additional amount of memory in the TabletServer's 
JVM heap.

Sorry this isn't clear-cut answer -- maybe we can do a better job 
encapsulating the important metrics in the docs somewhere?  You're 
certainly not the first to ask this question :)

- Josh

Mario Pastorelli wrote:
> Hey,
> I would like to know what is the maximum and recommended number of
> tablets that we should have per machine. Right now is some clusters we
> have thousands of tablets and the number of tables will increase in
> future. Eventually, we will have to add new machines to our clusters and
> a recommended number could help us decide the size of the new cluster.
> Thanks
> Mario
> --
> Mario Pastorelli| TERALYTICS
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