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Previously we were keeping up to around 6 hours of WAL around by removing 1/3 every hours. This was excessive, so switch to removing 2/3 which will up to around 3 hours of WAL around. This will roughly halve the size of the WAL and halve startup time for those who are I/O bound. This may increase the checkpoint size for those with certain churn patterns, but by much less than we're saving from the segments. Signed-off-by: Brian Brazil <brian.brazil@robustperception.io>
TSDB
This repository contains the Prometheus storage layer that is used in its 2.x releases.
A writeup of its design can be found here.
Based on the Gorilla TSDB white papers.
Video: Storing 16 Bytes at Scale from PromCon 2017.
See also the format documentation.