Changes:
* Make `NewReader` method useful. It was impossible to use it, because closer was always nil.
* ReadSymbols, TOC and ReadOffsetTable are not public functions (used by Thanos).
* decbufXXX are now functions.
* More verbose errors.
* Removed unused crc32 field.
* Some var name changes to make it more verbose:
* symbols -> allocatedSymbols
* symbolsSlice -> symbolsV1
* symbols -> symbolsV2
*
* Pre-calculate symbolsTableSize.
* Initialized symbols for Symbols() method with valid length.
* Added test for Symbol method.
* Made Decoder LookupSymbol method public. Kept Decode public as it is useful as helper from index package.
Signed-off-by: Bartek Plotka <bwplotka@gmail.com>
This change also uses the latest staticcheck version which comes with
new verifications, hence some clean up in the code.
Signed-off-by: Simon Pasquier <spasquie@redhat.com>
* *: use latest release of staticcheck
It also fixes a couple of things in the code flagged by the additional
checks.
Signed-off-by: Simon Pasquier <spasquie@redhat.com>
* Use official release of staticcheck
Also run 'go list' before staticcheck to avoid failures when downloading packages.
Signed-off-by: Simon Pasquier <spasquie@redhat.com>
Avoid a tree of merge objects, which can result in
what I suspect is n^2 calls to Seek when using Without.
With 100k metrics, and a regex of ^$ in BenchmarkHeadPostingForMatchers:
Before:
BenchmarkHeadPostingForMatchers-8 1 51633185216 ns/op 29745528 B/op 200357 allocs/op
After:
BenchmarkHeadPostingForMatchers-8 10 108924996 ns/op 25715025 B/op 101748 allocs/op
Signed-off-by: Brian Brazil <brian.brazil@robustperception.io>
Add WALSegmentSize as an option, and the corresponding flag "storage.tsdb.wal-segment-size" to tune the max size of wal segment files.
The addressed base problem is to reduce the disk space used by wal segment files : on a raspberry pi, for instance, we often want to reduce write load of the sd card, then, the wal directory is mounted on a memory (space limited) partition.
the default value of the segment max file size, pushed the size of directory to 128 MB for each segment , which is too much ram consumption on a rasp.
the initial discussion is at https://github.com/prometheus/tsdb/pull/450
With 1M series:
Before:
BenchmarkHeadPostingForMatchers-8 1 3501996117 ns/op 61311520 B/op 78 allocs/op
After:
BenchmarkHeadPostingForMatchers-8 1 1403072952 ns/op 69261568 B/op 72 allocs/op
This works out as 3X faster, as the above time includes other things.
Signed-off-by: Brian Brazil <brian.brazil@robustperception.io>
It is easy to forget to close the block returned by createPopulatedBlock
which causes failures for windows so instead it returns the block dir
and which can be used by OpenBlock explicitly.
Signed-off-by: Krasi Georgiev <kgeorgie@redhat.com>
The WALFlushInterval is not used anywhere in the code base.
The WAL is not an interface anymore to save some lookup time so can't use NopWAL in the tests. Instead can just pass nil as the code checks for that and it is essentially a noop.
Signed-off-by: Krasi Georgiev <kgeorgie@redhat.com>
This reports the cardinality of each label,
the total number of label pairs,
and how much series worth of time is "uncovered"
by series data. Which is basically how much churn there is.
Signed-off-by: Brian Brazil <brian.brazil@robustperception.io>
