[atlas] Time difference between results and update of measurement status

On 2019-02-22 17:24, Vasileios Giotsas wrote:
> I've seen that the status of a measurement is updated much later than
> when the measurement results become available. 
> For instance, while the RTTs of a ping measurement are returned the
> status is still Ongoing for up to 3 minutes.
> Is there anything (such as sanity checks) that intervenes between the
> update of the results and and update of the measurement status, which
> may change the results? 
> Or is it safe to assume that once the results are out the measurement
> status will eventually change to 'Stopped', just a bit later?
> 
> Thanks!
> Vasileios

Hi,

There's a loose relation between measurement stop time and when the last
measurement results come in. Results can come after stop time (e.g. when
some probes couldn't be told to stop measuring) and stop time can happen
after the last results came in (e.g. in the case of one-offs).

When the results are available for download is also a different
dimension; there are multiple buffering points involved, and if one of
them is clogged then the results can be delayed. This is normal,
especially in the case of network partitioning or maintenance work, for
example.

Regards,
Robert