[Hawkular-dev] Bucketed data issues when no datapoints fall in the bucket span.

[Thomas Segismont]

It's hard to determine what it means to interpolate values when you're 
looking at a metric at its resolution level.

Put another way, what does it mean to ask for avg/min/median for every 
30 seconds timespan if you have a point every 30 seconds?

Le 08/09/2015 22:30, Matt Wringe a écrit :
> I am running into a few issues when dealing with bucketed data when
> there is no datapoints which happen to fall within a particular bucket size.
>
> For instance, lets say I am getting data every 30 seconds. If my bucket
> spans at least 30 seconds than everything works fine and all my buckets
> contain non-empty data.
>
> But, if I were to 'zoom in' a bit and ask for a bucket span less than 30
> seconds, then some of the buckets would return with empty data.
>
> Or, if my data does not come in perfectly for each of those 30 second
> fragments (say the timestamps are plus or minus a couple of seconds)
> then I could also end up with some buckets containing empty data as well.
>
> This causes some strange charting behaviour. If a bucket is empty, then
> its just not displayed in the chart. This means we can end up with
> non-continuous lines in the charts, which is not desired.
>
> Anyone know what should be done in this situation?
>
> Its not really that there is no data there and nothing should be
> graphed, its just that the bucket span is too small to show anything in
> there.
>
> Should charting just ignore empty buckets if they are not at the start
> or the end?
>
> Should hawkular metrics perform calculations to figure out what the
> missing bucket values should be?
>
> Any ideas here?
>
>
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