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Manu: \"Mostly archived, not updated\"\n\n[![Build Status](https://travis-ci.org/cldellow/manu.svg?branch=master)](https://travis-ci.org/cldellow/manu)\n[![codecov](https://codecov.io/gh/cldellow/manu/branch/master/graph/badge.svg)](https://codecov.io/gh/cldellow/manu)\n[![Maven Central](https://img.shields.io/maven-central/v/com.cldellow/manu.svg)](https://mvnrepository.com/artifact/com.cldellow/manu)\n\nA time series storage format for integers and floats, using efficient delta encodings from [FastPFOR](https://github.com/lemire/JavaFastPFOR).\n\nExamples: pageviews by article in Wikipedia, stock open/close/high/low prices, weather temperatures.\n\n## Components\n- [manu-format](format), a library for maintaining the data on disk\n- [manu-cli](cli), a command-line tool for ingesting data into the format\n- [manu-serve](serve), a web server to expose the data over REST\n\n## Design criteria\n### Priorities\n- Cheap\n  - I'm doing this to drive a hobby project; my dream would be to host a variety of datasets for $10/month.\n  - A Fermi estimate suggests Wikipedia pageviews has 100B datapoints over the last 10 years. This implies that storage costs will dominate.\n- Doesn’t need to be always-on\n  - This sort of follows from cheap -- the ability to load subsets of data, or to run on spot instances will be a useful tool to cut costs.\n\n### Non-priorities\n- Concurrent / fast writes\n  - These can happen offline.\n- Fast reads\n  - The pareto principle will likely apply to queries - 1% of keys will get 99% of reads. We can use Varnish or similar to cache at the application level.\n\n### Assumptions\n- Dense datasets\n  - Keys: if we see a key once, we expect to see it again.\n  - Values: if key X has a datapoint at T1, we expect most other keys will as well.\n- Correlated values\n  - Value for key X at T1 is likely related to value at T2.\n- Some datasets can be lossy\n  - Wikipedia pageviews, e.g., are likely insensitive to precision so long as the trend is generally correct.\n\n## Obligatory\n\n![Manu](https://www.smbc-comics.com/comics/1429540032-20150420.png)\n\nCredit: [Our Greatest Asset](https://www.smbc-comics.com/comic/our-greatest-asset), Saturday Morning Breakfast Cereal\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fcldellow%2Fmanu","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fcldellow%2Fmanu","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fcldellow%2Fmanu/lists"}