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lib/storage: time series search optimization according to production workload profiling

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Do not pass filter metric ids to getMetricIDsForTagFilter, since it has been appeared that this slows down
the function by multiple times when it finds big number of metricIDs (tens of millions).
This commit is contained in:
Aliaksandr Valialkin 2021-03-16 20:01:41 +02:00
parent 264d3432ac
commit fd86a7dc1d
1 changed files with 10 additions and 15 deletions
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25
lib/storage/index_db.go
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@ -2058,7 +2058,7 @@ func (is *indexSearch) getTagFilterWithMinMetricIDsCount(tfs *TagFilters, maxMet
continue
}
metricIDs, _, err := is.getMetricIDsForTagFilter(tf, nil, maxMetrics, int64Max)
metricIDs, _, err := is.getMetricIDsForTagFilter(tf, maxMetrics, int64Max)
if err != nil {
return nil, nil, fmt.Errorf("cannot find MetricIDs for tagFilter %s: %w", tf, err)
}
@ -2361,20 +2361,14 @@ const (
var uselessTagFilterCacheValue = []byte("1")
func (is *indexSearch) getMetricIDsForTagFilter(tf *tagFilter, filter *uint64set.Set, maxMetrics int, maxLoopsCount int64) (*uint64set.Set, int64, error) {
func (is *indexSearch) getMetricIDsForTagFilter(tf *tagFilter, maxMetrics int, maxLoopsCount int64) (*uint64set.Set, int64, error) {
if tf.isNegative {
logger.Panicf("BUG: isNegative must be false")
}
metricIDs := &uint64set.Set{}
if len(tf.orSuffixes) > 0 {
// Fast path for orSuffixes - seek for rows for each value from orSuffixes.
var loopsCount int64
var err error
if filter != nil {
loopsCount, err = is.updateMetricIDsForOrSuffixesWithFilter(tf, metricIDs, filter, maxLoopsCount)
} else {
loopsCount, err = is.updateMetricIDsForOrSuffixesNoFilter(tf, metricIDs, maxMetrics, maxLoopsCount)
}
loopsCount, err := is.updateMetricIDsForOrSuffixesNoFilter(tf, metricIDs, maxMetrics, maxLoopsCount)
if err != nil {
return nil, loopsCount, fmt.Errorf("error when searching for metricIDs for tagFilter in fast path: %w; tagFilter=%s", err, tf)
}
@ -2382,7 +2376,9 @@ func (is *indexSearch) getMetricIDsForTagFilter(tf *tagFilter, filter *uint64set
}
// Slow path - scan for all the rows with the given prefix.
loopsCount, err := is.getMetricIDsForTagFilterSlow(tf, filter, metricIDs.Add, maxLoopsCount)
// Pass nil filter to getMetricIDsForTagFilterSlow, since it works faster on production workloads
// than non-nil filter with many entries.
loopsCount, err := is.getMetricIDsForTagFilterSlow(tf, nil, metricIDs.Add, maxLoopsCount)
if err != nil {
return nil, loopsCount, fmt.Errorf("error when searching for metricIDs for tagFilter in slow path: %w; tagFilter=%s", err, tf)
}
@ -2872,7 +2868,7 @@ func (is *indexSearch) getMetricIDsForDateAndFilters(date uint64, tfs *TagFilter
continue
}
maxLoopsCount := getFirstPositiveLoopsCount(tfws[i+1:])
m, loopsCount, err := is.getMetricIDsForDateTagFilter(tf, date, nil, tfs.commonPrefix, maxDateMetrics, maxLoopsCount)
m, loopsCount, err := is.getMetricIDsForDateTagFilter(tf, date, tfs.commonPrefix, maxDateMetrics, maxLoopsCount)
if err != nil {
if errors.Is(err, errTooManyLoops) {
// The tf took too many loops compared to the next filter. Postpone applying this filter.
@ -2966,7 +2962,7 @@ func (is *indexSearch) getMetricIDsForDateAndFilters(date uint64, tfs *TagFilter
break
}
maxLoopsCount := getFirstPositiveFilterLoopsCount(tfws[i+1:])
m, filterLoopsCount, err := is.getMetricIDsForDateTagFilter(tf, date, metricIDs, tfs.commonPrefix, intMax, maxLoopsCount)
m, filterLoopsCount, err := is.getMetricIDsForDateTagFilter(tf, date, tfs.commonPrefix, intMax, maxLoopsCount)
if err != nil {
if errors.Is(err, errTooManyLoops) {
// Postpone tf, since it took more loops than the next filter may need.
@ -3152,8 +3148,7 @@ func (is *indexSearch) hasDateMetricID(date, metricID uint64) (bool, error) {
return true, nil
}
func (is *indexSearch) getMetricIDsForDateTagFilter(tf *tagFilter, date uint64, filter *uint64set.Set, commonPrefix []byte,
maxMetrics int, maxLoopsCount int64) (*uint64set.Set, int64, error) {
func (is *indexSearch) getMetricIDsForDateTagFilter(tf *tagFilter, date uint64, commonPrefix []byte, maxMetrics int, maxLoopsCount int64) (*uint64set.Set, int64, error) {
// Augument tag filter prefix for per-date search instead of global search.
if !bytes.HasPrefix(tf.prefix, commonPrefix) {
logger.Panicf("BUG: unexpected tf.prefix %q; must start with commonPrefix %q", tf.prefix, commonPrefix)
@ -3165,7 +3160,7 @@ func (is *indexSearch) getMetricIDsForDateTagFilter(tf *tagFilter, date uint64,
tfNew := *tf
tfNew.isNegative = false // isNegative for the original tf is handled by the caller.
tfNew.prefix = kb.B
metricIDs, loopsCount, err := is.getMetricIDsForTagFilter(&tfNew, filter, maxMetrics, maxLoopsCount)
metricIDs, loopsCount, err := is.getMetricIDsForTagFilter(&tfNew, maxMetrics, maxLoopsCount)
kbPool.Put(kb)
return metricIDs, loopsCount, err
}