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comments about the 120samples const and link to Gorilla papers. (#423) 

Signed-off-by: Krasi Georgiev <kgeorgie@redhat.com>
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Krasi Georgiev 2018-10-23 13:43:06 +03:00 committed by GitHub
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README.md
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@ -7,6 +7,8 @@ This repository contains the Prometheus storage layer that is used in its 2.x re
A writeup of its design can be found [here](https://fabxc.org/blog/2017-04-10-writing-a-tsdb/).
Based on the Gorilla TSDB [white papers](http://www.vldb.org/pvldb/vol8/p1816-teller.pdf).
Video: [Storing 16 Bytes at Scale](https://youtu.be/b_pEevMAC3I) from [PromCon 2017](https://promcon.io/2017-munich/).
See also the [format documentation](docs/format/README.md).

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head.go
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@ -1427,6 +1427,9 @@ func (s *memSeries) truncateChunksBefore(mint int64) (removed int) {
// append adds the sample (t, v) to the series.
func (s *memSeries) append(t int64, v float64) (success, chunkCreated bool) {
// Based on Gorilla white papers this offers near-optimal compression ratio
// so anything bigger that this has diminishing returns and increases
// the time range within which we have to decompress all samples.
const samplesPerChunk = 120
c := s.head()