This guaranees that the zero threshold is byte-aligned. Not sure if
that helps in any way, but at least it won't harm.
Signed-off-by: beorn7 <beorn@grafana.com>
This adds bit buckets for larger numbers to varbit encoding and also
an unsigned version of varbit encoding.
Then, varbit encoding is used for all the histogram chunk data instead
of varint.
Signed-off-by: beorn7 <beorn@grafana.com>
* Use dedicated Ref type
Throughout the code base, there are reference types masked as
regular integers. Let's use dedicated types. They are
equivalent, but clearer semantically.
This also makes it trivial to find where they are used,
and from uses, find the centralized docs.
Signed-off-by: Dieter Plaetinck <dieter@grafana.com>
* postpone some work until after possible return
Signed-off-by: Dieter Plaetinck <dieter@grafana.com>
* clarify
Signed-off-by: Dieter Plaetinck <dieter@grafana.com>
* rename feedback
Signed-off-by: Dieter Plaetinck <dieter@grafana.com>
* skip header is up to caller
Signed-off-by: Dieter Plaetinck <dieter@grafana.com>
A lot of this code was hacked together, literally during a
hackathon. This commit intends not to change the code substantially,
but just make the code obey the usual style practices.
A (possibly incomplete) list of areas:
* Generally address linter warnings.
* The `pgk` directory is deprecated as per dev-summit. No new packages should
be added to it. I moved the new `pkg/histogram` package to `model`
anticipating what's proposed in #9478.
* Make the naming of the Sparse Histogram more consistent. Including
abbreviations, there were just too many names for it: SparseHistogram,
Histogram, Histo, hist, his, shs, h. The idea is to call it "Histogram" in
general. Only add "Sparse" if it is needed to avoid confusion with
conventional Histograms (which is rare because the TSDB really has no notion
of conventional Histograms). Use abbreviations only in local scope, and then
really abbreviate (not just removing three out of seven letters like in
"Histo"). This is in the spirit of
https://github.com/golang/go/wiki/CodeReviewComments#variable-names
* Several other minor name changes.
* A lot of formatting of doc comments. For one, following
https://github.com/golang/go/wiki/CodeReviewComments#comment-sentences
, but also layout question, anticipating how things will look like
when rendered by `godoc` (even where `godoc` doesn't render them
right now because they are for unexported types or not a doc comment
at all but just a normal code comment - consistency is queen!).
* Re-enabled `TestQueryLog` and `TestEndopints` (they pass now,
leaving them disabled was presumably an oversight).
* Bucket iterator for histogram.Histogram is now created with a
method.
* HistogramChunk.iterator now allows iterator recycling. (I think
@dieterbe only commented it out because he was confused by the
question in the comment.)
* HistogramAppender.Append panics now because we decided to treat
staleness marker differently.
Signed-off-by: beorn7 <beorn@grafana.com>
* Support stale samples for sparse histograms
Signed-off-by: Ganesh Vernekar <ganeshvern@gmail.com>
* Don't cut a new chunk for every stale sample
Signed-off-by: Ganesh Vernekar <ganeshvern@gmail.com>
* Update comments for HistoAppender.Appendable
Signed-off-by: Ganesh Vernekar <ganeshvern@gmail.com>
* Fix review comments
Signed-off-by: Ganesh Vernekar <ganeshvern@gmail.com>
* Call delete on head if interval overlaps
Signed-off-by: darshanime <deathbullet@gmail.com>
* Garbage collect tombstones during head gc
Signed-off-by: darshanime <deathbullet@gmail.com>
* Truncate tombstones before min time during head gc
Signed-off-by: darshanime <deathbullet@gmail.com>
* Lock less by deleting all keys in a single pass
Signed-off-by: darshanime <deathbullet@gmail.com>
* Pass map to DeleteTombstones
Signed-off-by: darshanime <deathbullet@gmail.com>
* Create new slice to replace old one
Signed-off-by: darshanime <deathbullet@gmail.com>
* Decrement active_appenders metric when no samples added
Also add a test that the metric is incremented and decremented as
expected with and without samples.
Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
* Fix comment
Signed-off-by: Ganesh Vernekar <ganeshvern@gmail.com>
Co-authored-by: Ganesh Vernekar <ganeshvern@gmail.com>
This saves memory, effort and locking.
Since every symbol is also added to postings, `Symbols()` can be
implemented there instead. This now has to build a map for
deduplication, but `Symbols()` is only called for compaction, and `gc()`
used to rebuild the symbols map after every compaction so not an
additional cost.
Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
* Remove query hacks in the API and fix metrics
Signed-off-by: Ganesh Vernekar <ganeshvern@gmail.com>
* Tests for the metrics
Signed-off-by: Ganesh Vernekar <ganeshvern@gmail.com>
* Better way to count series on restart
Signed-off-by: Ganesh Vernekar <ganeshvern@gmail.com>
beorn7