github-mirrors/VictoriaMetrics
1
0
Fork 0
mirror of https://github.com/VictoriaMetrics/VictoriaMetrics.git synced 2024-11-21 14:44:00 +00:00
Code Issues Projects Releases Packages Wiki Activity

lib/storage: do not re-calculate stats for heavy tag filters

Browse source 
This should reduce the number of slow queries when stats for heavy tag filters was recalculated.
This commit is contained in:
Aliaksandr Valialkin 2021-02-21 21:32:52 +02:00
parent 48656dcc38
commit 388cdb1980
1 changed files with 6 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

9
lib/storage/index_db.go
View file

@ -2797,9 +2797,12 @@ func (is *indexSearch) getMetricIDsForDateAndFilters(date uint64, tfs *TagFilter
tf := &tfs.tfs[i] tf := &tfs.tfs[i]
loopsCount, lastQueryTimestamp := is.getLoopsCountAndTimestampForDateFilter(date, tf) loopsCount, lastQueryTimestamp := is.getLoopsCountAndTimestampForDateFilter(date, tf)
origLoopsCount := loopsCount origLoopsCount := loopsCount
if currentTime > lastQueryTimestamp+60*60 { if currentTime > lastQueryTimestamp+3*3600 {
// Reset loopsCount to 0 every hour for collecting updated stats for the tf. // Update stats once per 3 hours only for relatively fast tag filters.
loopsCount = 0 // There is no need in spending CPU resources on updating stats for slow tag filters.
if loopsCount <= 10e6 {
loopsCount = 0
}
} }
if loopsCount == 0 { if loopsCount == 0 {
// Prevent from possible thundering herd issue when heavy tf is executed from multiple concurrent queries // Prevent from possible thundering herd issue when heavy tf is executed from multiple concurrent queries