Package: wnpp Severity: wishlist Owner: Elliot Murphy <ell...@ubuntu.com>
This bug report is about my intent to package python-whisper, which is a part of the graphite project: http://graphite.wikidot.com/faq * Package name : python-whisper Version : 0.9.5 Upstream Author : Chris Davis <chri...@gmail.com> * URL : http://pypi.python.org/pypi/whisper/ * License : Apache-2.0 Programming Lang: Python Description : fast, reliable storage of numeric data over time. Whisper is a fixed size database, similar in design to RRD. RRD is great, and initially Graphite did use RRD for storage.. Over time though, we ran into several issues inherent to RRD's design. 1. RRD can't take updates for a timestamp prior to its most recent update. So for example, if you miss an update for some reason you have no simple way of back-filling your RRD file by telling rrdtool to apply an update to the past. Whisper does not have this limitation, and this makes importing historical data into Graphite way way easier. 2. At the time whisper was written, RRD did not support compacting multiple updates into a single operation. This feature is critical to Graphite's scalability. 3. RRD doesn't like irregular updates. If you update an RRD but don't follow up another update soon, your original update will be lost. This is the straw that broke the camel's back, since Graphite is used for various operational metrics, some of which do not occur regularly (randomly occuring errors for instance) we started to notice that Graphite sometimes wouldn't display data points which we knew existed because we'd received alarms on them from other tools. The problem turned out to be that RRD was dropping the data points because they were irregular. Whisper had to be written to ensure that all data was reliably stored and accessible. -- To UNSUBSCRIBE, email to debian-devel-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
