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lib/storage: skip repeated useless work when intersection of metricIDs with the given filter is too expensive

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This should improve performance for query filters over big number of time series.
This commit is contained in:
Aliaksandr Valialkin 2019-11-05 14:17:59 +02:00
parent f48e97263c
commit f93c4f2493
1 changed files with 30 additions and 3 deletions
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33
lib/storage/index_db.go
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@ -1591,7 +1591,7 @@ func (is *indexSearch) updateMetricIDsForTagFilters(metricIDs *uint64set.Set, tf
if tf == minTf {
continue
}
mIDs, err := is.intersectMetricIDsWithTagFilter(tf, minMetricIDs)
mIDs, err := is.intersectMetricIDsWithTagFilter(tf, minMetricIDs, tfs.accountID, tfs.projectID)
if err == errFallbackToMetricNameMatch {
// The tag filter requires too many index scans. Postpone it,
// so tag filters with lower number of index scans may be applied.
@ -1608,7 +1608,7 @@ func (is *indexSearch) updateMetricIDsForTagFilters(metricIDs *uint64set.Set, tf
return is.updateMetricIDsByMetricNameMatch(metricIDs, minMetricIDs, tfsPostponed, tfs.accountID, tfs.projectID)
}
for i, tf := range tfsPostponed {
mIDs, err := is.intersectMetricIDsWithTagFilter(tf, minMetricIDs)
mIDs, err := is.intersectMetricIDsWithTagFilter(tf, minMetricIDs, tfs.accountID, tfs.projectID)
if err == errFallbackToMetricNameMatch {
return is.updateMetricIDsByMetricNameMatch(metricIDs, minMetricIDs, tfsPostponed[i:], tfs.accountID, tfs.projectID)
}
@ -1625,6 +1625,7 @@ const (
uselessSingleTagFilterKeyPrefix = 0
uselessMultiTagFiltersKeyPrefix = 1
uselessNegativeTagFilterKeyPrefix = 2
uselessTagIntersectKeyPrefix = 3
)
var uselessTagFilterCacheValue = []byte("1")
@ -2093,10 +2094,36 @@ func (is *indexSearch) updateMetricIDsAll(metricIDs *uint64set.Set, accountID, p
// over the found metrics.
const maxIndexScanLoopsPerMetric = 100
func (is *indexSearch) intersectMetricIDsWithTagFilter(tf *tagFilter, filter *uint64set.Set) (*uint64set.Set, error) {
func (is *indexSearch) intersectMetricIDsWithTagFilter(tf *tagFilter, filter *uint64set.Set, accountID, projectID uint32) (*uint64set.Set, error) {
if filter.Len() == 0 {
return nil, nil
}
kb := &is.kb
filterLenRounded := (uint64(filter.Len()) / 1024) * 1024
kb.B = append(kb.B[:0], uselessTagIntersectKeyPrefix)
kb.B = encoding.MarshalUint64(kb.B, filterLenRounded)
kb.B = tf.Marshal(kb.B, accountID, projectID)
if len(is.db.uselessTagFiltersCache.Get(nil, kb.B)) > 0 {
// Skip useless work, since the intersection will return
// errFallbackToMetricNameMatc for the given filter.
return nil, errFallbackToMetricNameMatch
}
metricIDs, err := is.intersectMetricIDsWithTagFilterNocache(tf, filter)
if err == nil {
return metricIDs, err
}
if err != errFallbackToMetricNameMatch {
return nil, err
}
kb.B = append(kb.B[:0], uselessTagIntersectKeyPrefix)
kb.B = encoding.MarshalUint64(kb.B, filterLenRounded)
kb.B = tf.Marshal(kb.B, accountID, projectID)
is.db.uselessTagFiltersCache.Set(kb.B, uselessTagFilterCacheValue)
return nil, errFallbackToMetricNameMatch
}
func (is *indexSearch) intersectMetricIDsWithTagFilterNocache(tf *tagFilter, filter *uint64set.Set) (*uint64set.Set, error) {
metricIDs := filter
if !tf.isNegative {
metricIDs = &uint64set.Set{}