> On 14 Dec 2015, at 16:25, Niels Basjes <ni...@basjes.nl> wrote: > > Hi, > > I have a very small topology here. > In fact this is a thing that generates synthetic data and puts it into Kafka. > When looking at the web UI I see that all counters (i.e. Bytes received, > Records received, Bytes sent, Records sent) all remain 0. > I verified and I'm seeing thousands of records arriving into Kafka. > > Is this a bug in Flink or am I misinterpreting the meaning of these numbers?
Sources and sinks do not show the number of received or sent records, because of the internals of how these numbers are collected. I agree that this is confusing. Big +1 to improve this. You actually don’t see any numbers, because the operators are chained and hence you only have one task, which acts as both source and sink. You should see some sent and received numbers if you break up the chain (env.disableOperatorChaining()). Can you confirm this? – Ufuk
