Commits on Dec 30, 2015

1. transient stats prototype …

   This is a prototype for the collection of transient performance statistics.
   It does not yet expose "useful" runtime statistics, but is meant to lay the
   groundwork for doing so across different parts of the system.
   
   We were previously using the `go-metrics` package, which provides the concept
   of a `Registry` bundling different metrics. Unfortunately, various limitations,
   a certain amount of interface bloat (which made it annoying to provide custom
   implementations) and various design choices made this unwieldy to work with
   without upstream adaptations.
   Instead, introduced the `util/metric` package which replaces the registry
   functionality and provides light wrapper implementations around metrics.
   
   Metric registries can be nested and in fact we do so, keeping one "global"
   metrics registry and various others in it. In particular Node- and Store-level
   metrics have individual registries. This is useful since this allows their
   metrics to be stored to their corresponding time series with simple iterations
   over a registry and with correct names globally and locally.
   
   For now, we wrap `Counter`, `Gauge` and `EWMA` types and provide a windowed
   histogram (based on Gil Tene's `HDRHistogram`s). Others (such as reservoir
   backed histograms can be added as required.

   

   tbg committed Dec 30, 2015
   Configuration menu

   • View commit details
   • Copy full SHA for 3a82c69
   • Browse repository at this point

   Copy the full SHA

   3a82c69 View commit details

   Browse the repository at this point in the history