I haven't used it at all yet, but maybe check out using the deadman helper 
function 
(https://docs.influxdata.com/kapacitor/v1.2/nodes/window_node/#deadman) in 
kapacitor?

-Chris

On Tuesday, February 14, 2017 at 8:12:09 AM UTC-6, [email protected] 
wrote:
>
> Hi,
>
> I have a stream of IoT sensor data being fed into Influx. Occasionally 
> some data may be lost during transmission (device out of range etc) and I 
> need to detect when this happens so I can request re-transmission.
>
> One option would be to run a periodic process to find the gaps. However 
> doing this for thousands of sensors will, I suspect, get quite heavy. I 
> have a couple of questions about the data flow within Influx.
>
> 1. When I write via the HTTP api and I get a HTTP 204 response has the 
> data been written to the disk?
> 2. If I have a Kapacitor UDF has the data been written before it reaches 
> my UDF?
> 3. Is a UDF instance created for each stream interval or does it carry 
> over?
>
> Alternatively is there another methodology for detecting gaps in data in 
> Influx?
>
> Thanks,
>
> Rowan
>
>

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