[BUG] Long whisper files fail to render more than 7d of history

[lachesis]

Describe the bug I have some carbon/whisper files with many years of history. When I try to render more than 7 days worth of data from these metrics, I get back a graph with only one or two points towards the very end. Using whisper-dump.py, I am able to see all of my historical data is intact. My storage schemas are:

[default]
pattern = .*
retentions = 10s:7d,10m:60d,1h:5y,4h:10y

To Reproduce

1. Unzip the attached WSP file and provide it to Graphite in storage/stats/gauges/ups/load.wsp. load.wsp.zip
2. Hit the render API for 7 days. Note all points are intact. http://localhost:3081/render?target=stats.gauges.ups.load&from=-7d&until=now&format=json
3. Hit the render API for 30 days. Note only one point is returned. http://localhost:3081/render?target=stats.gauges.ups.load&from=-30d&until=now&format=json

Expected behavior I'd expect to see data from all 30 days.

Screenshots Screenshots of graph in Grafana, but I've minimized this problem to be occurring in graphite-web.

Environment (please complete the following information):

• OS flavor: alpine
• Graphite-web version: 1.2.0-dev, latest master from today
• Django/Python version: 2.7.15
• Setup type: from sources, using kamon/docker-grafana-graphite built today

Additional context This doesn't happen exactly the same way for every metric. Some other metrics include early data but no newer data.

[deniszh]

I can reproduce but I'm suspecting something is wrong with file itself. it contains 3 archives instead of 4 (10s:7d,10m:60d,1h:5y), whisper-dump shows data, and data looks valid. But whisper-fetch shows exactly same result as Graphite for second archive for some reason...

[stale[bot]]

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