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From "Laing, Michael" <>
Subject Re: Measuring WAN replication latency
Date Wed, 30 Jul 2014 01:24:44 GMT
I saw this awhile back:

With requests possibly coming in from either US region, we need to make
> sure that the replication of data happens within an acceptable time
> threshold. This lead us to perform an experiment where we wrote 1 million
> records in one region of a multi-region cluster. We then initiated a read,
> 500ms later, in the other region, of the records that were just written in
> the initial region, while keeping a production level of load on the
> cluster. All records were successfully read.


On Tue, Jul 29, 2014 at 5:53 PM, Robert Coli <> wrote:

> On Tue, Jul 29, 2014 at 3:15 PM, Rahul Neelakantan <> wrote:
>> Does anyone know of a way to measure/monitor WAN replication latency for
>> Cassandra?
> No. [1]
> =Rob
> [1] There are ways to do something like this task, but you probably don't
> actually want to do them. Trying to do them suggests that you are relying
> on WAN replication timing for your application, which is something you
> almost certainly do not want to do. Why do you believe you have this
> requirement?

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