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

[Matt Wringe]

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?