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delete_series.go
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delete_series.go
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package correctness
import (
"context"
"errors"
"flag"
"fmt"
"net/http"
"net/url"
"path"
"sync"
"time"
"github.com/go-kit/log/level"
v1 "github.com/prometheus/client_golang/api/prometheus/v1"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
"github.com/weaveworks/common/user"
util_log "github.com/cortexproject/cortex/pkg/util/log"
"github.com/cortexproject/cortex/pkg/util/spanlogger"
)
const deleteRequestPath = "/api/v1/admin/tsdb/delete_series"
var (
deleteRequestCreationAttemptsTotal = promauto.NewCounterVec(prometheus.CounterOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "delete_requests_creation_attempts_total",
Help: "Total number of delete requests creation attempts with status",
}, []string{"status"})
deleteRequestVerificationsSkippedTotal = promauto.NewCounterVec(prometheus.CounterOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "delete_request_verification_skipped_total",
Help: "Total number of queries verifying delete series that were skipped",
}, []string{"test_name"})
)
type DeleteSeriesTestConfig struct {
deleteRequestCreationInterval time.Duration
deleteDataForRange time.Duration
timeQueryStart TimeValue
durationQuerySince time.Duration
purgerAddr string
PrometheusAddr string
ExtraSelectors string
UserID string
}
func (cfg *DeleteSeriesTestConfig) RegisterFlags(f *flag.FlagSet) {
f.DurationVar(&cfg.deleteRequestCreationInterval, "delete-request-creation-interval", 5*time.Minute, "The interval at which delete request should be sent.")
f.DurationVar(&cfg.deleteDataForRange, "delete-data-for-range", 2*time.Minute, "Time range for which data is deleted.")
f.StringVar(&cfg.purgerAddr, "purger-addr", "", "Purger address to send delete requests. Keep empty to use same address as prometheus-address.")
// By default, we only query for values from when this process started
cfg.timeQueryStart = NewTimeValue(time.Now())
f.Var(&cfg.timeQueryStart, "delete-series-test.test-query-start", "Minimum start date for queries")
f.DurationVar(&cfg.durationQuerySince, "delete-series-test.test-query-since", 0, "Duration in the past to test. Overrides -test-query-start")
}
// DeleteSeriesTest would keep deleting data for configured duration at configured interval.
// Test method would check whether we are getting expected data by eliminating deleted samples while non deleted ones stays untouched.
// For simplification it would not test samples from the start time of last sent delete request and just treat it as passed.
type DeleteSeriesTest struct {
Case
cfg DeleteSeriesTestConfig
commonTestConfig CommonTestConfig
lastDeleteRequestInterval interval
lastDeleteRequestIntervalMutex sync.RWMutex
quit chan struct{}
wg sync.WaitGroup
}
func NewDeleteSeriesTest(name string, f func(time.Time) float64, cfg DeleteSeriesTestConfig, commonTestConfig CommonTestConfig) Case {
commonTestConfig.timeQueryStart = cfg.timeQueryStart
commonTestConfig.durationQuerySince = cfg.durationQuerySince
test := DeleteSeriesTest{
Case: NewSimpleTestCase(name, f, commonTestConfig),
cfg: cfg,
commonTestConfig: commonTestConfig,
quit: make(chan struct{}),
}
if cfg.purgerAddr == "" {
test.cfg.purgerAddr = test.cfg.PrometheusAddr
}
test.wg.Add(1)
go test.sendDeleteRequestLoop()
return &test
}
func (d *DeleteSeriesTest) Stop() {
close(d.quit)
d.wg.Wait()
}
func (d *DeleteSeriesTest) sendDeleteRequestLoop() {
defer d.wg.Done()
// send a delete request as soon as we start to avoid missing creation of delete request across restarts.
err := d.sendDeleteRequest()
if err != nil {
level.Error(util_log.Logger).Log("msg", "error sending delete request", "error", err)
}
t := time.NewTicker(d.cfg.deleteRequestCreationInterval)
defer t.Stop()
for {
select {
case <-t.C:
err := d.sendDeleteRequest()
if err != nil {
level.Error(util_log.Logger).Log("msg", "error sending delete request", "error", err)
}
case <-d.quit:
return
}
}
}
func (d *DeleteSeriesTest) Test(ctx context.Context, client v1.API, selectors string, start time.Time, duration time.Duration) (bool, error) {
log := spanlogger.FromContext(ctx)
queryInterval := interval{start: start.Add(-duration), end: start}
d.lastDeleteRequestIntervalMutex.RLock()
defer d.lastDeleteRequestIntervalMutex.RUnlock()
// we do not want to query data after the start time of last delete request sent to simplify things.
lastDeleteRequestInterval := d.lastDeleteRequestInterval
if !queryInterval.end.Before(lastDeleteRequestInterval.start) {
deleteRequestVerificationsSkippedTotal.WithLabelValues(d.Name()).Inc()
level.Info(log).Log("msg", fmt.Sprintf("skipping test for %d to %d requesting samples after last sent delete request's start time %d",
start.Add(-duration).Unix(), start.Unix(), lastDeleteRequestInterval.end.Unix()))
return true, nil
}
pairs, err := d.Query(ctx, client, selectors, start, duration)
if err != nil {
level.Error(log).Log("err", err)
return false, err
}
nonDeletedIntervals := d.getNonDeletedIntervals(queryInterval)
if len(nonDeletedIntervals) == 0 {
// we are querying data covered completed by deleted interval so there should not be any sample pairs returned by the query.
if len(pairs) != 0 {
return false, errors.New("samples should be 0")
}
return true, nil
}
level.Debug(log).Log("start", start.Unix(), "query-start", queryInterval.start.Unix(),
"query-end", queryInterval.end.Unix(), "non-deleted-intervals")
verifyPairsFrom, verifyPairsTo := 0, 0
for _, nonDeletedInterval := range nonDeletedIntervals {
for ; verifyPairsTo < len(pairs); verifyPairsTo++ {
pair := pairs[verifyPairsTo]
// do not fail the test if difference is just by couple of ms or ns.
if pair.Timestamp.Time().Before(nonDeletedInterval.start) && pair.Timestamp.Unix() != nonDeletedInterval.start.Unix() {
level.Error(log).Log("msg", "unexpected sample", "timestamp", pair.Timestamp.Unix(), "non-deleted-interval.start", nonDeletedInterval.start.Unix(),
"non-deleted-interval.end", nonDeletedInterval.end.Unix())
return false, nil
} else if pair.Timestamp.Time().After(nonDeletedInterval.end) {
break
}
}
passed := verifySamples(spanlogger.FromContext(ctx), d, pairs[verifyPairsFrom:verifyPairsTo], nonDeletedInterval.end.Sub(nonDeletedInterval.start), d.commonTestConfig)
if !passed {
verifyingPairs := pairs[verifyPairsFrom:verifyPairsTo]
if len(verifyingPairs) == 0 {
level.Error(log).Log("msg", fmt.Sprintf("expected samples from %d to %d but got 0 samples", nonDeletedInterval.start.Unix(),
nonDeletedInterval.end.Unix()), "query start", start.Unix(), "query duration", duration)
} else {
level.Error(log).Log("msg", "failed to verify samples batch", "query start", start.Unix(), "query duration", duration,
"batch length", len(verifyingPairs),
"batch duration", nonDeletedInterval.end.Sub(nonDeletedInterval.start), "batch-start", verifyingPairs[0].Timestamp.Unix(),
"batch-end", verifyingPairs[len(verifyingPairs)-1].Timestamp.Unix())
}
return false, nil
}
verifyPairsFrom = verifyPairsTo
}
return true, nil
}
func (d *DeleteSeriesTest) sendDeleteRequest() (err error) {
// data is deleted by slicing the time by deleteRequestCreationInterval from 0 time i.e beginning of epoch
// and doing deletion for last deleteDataForRange duration at the end of that slice.
endTime := time.Now().Truncate(d.cfg.deleteRequestCreationInterval)
startTime := endTime.Add(-d.cfg.deleteDataForRange)
metricName := prometheus.BuildFQName(namespace, subsystem, d.Name())
selectors := fmt.Sprintf("%s{%s}", metricName, d.cfg.ExtraSelectors)
defer func() {
status := success
if err != nil {
status = fail
}
deleteRequestCreationAttemptsTotal.WithLabelValues(status).Inc()
}()
baseURL, err := url.Parse(d.cfg.purgerAddr)
if err != nil {
return
}
baseURL.Path = path.Join(baseURL.Path, deleteRequestPath)
query := baseURL.Query()
query.Add("match[]", selectors)
query.Add("start", fmt.Sprint(startTime.Unix()))
query.Add("end", fmt.Sprint(endTime.Unix()))
baseURL.RawQuery = query.Encode()
r, err := http.NewRequest("POST", baseURL.String(), nil)
if err != nil {
return err
}
if d.cfg.UserID != "" {
r = r.WithContext(user.InjectOrgID(r.Context(), d.cfg.UserID))
err = user.InjectOrgIDIntoHTTPRequest(r.Context(), r)
if err != nil {
return err
}
}
level.Error(util_log.Logger).Log("msg", "sending delete request", "selector", selectors, "starttime", startTime, "endtime", endTime)
resp, err := http.DefaultClient.Do(r)
if err != nil {
return
}
if resp.StatusCode != 204 {
return fmt.Errorf("unexpected status code %d", resp.StatusCode)
}
d.lastDeleteRequestIntervalMutex.Lock()
defer d.lastDeleteRequestIntervalMutex.Unlock()
d.lastDeleteRequestInterval = interval{startTime, endTime}
return
}
func (d *DeleteSeriesTest) getNonDeletedIntervals(queryInterval interval) []interval {
intervalToProcess := queryInterval
var nonDeletedIntervals []interval
// build first deleted interval
deletedIntervalEnd := queryInterval.start.Truncate(d.cfg.deleteRequestCreationInterval)
deletedIntervalStart := deletedIntervalEnd.Add(-d.cfg.deleteDataForRange)
// first deleted interval could be out of range so try next intervals to find first relevant interval.
for !deletedIntervalStart.After(intervalToProcess.start) {
deletedIntervalStart = deletedIntervalStart.Add(d.cfg.deleteRequestCreationInterval)
if deletedIntervalEnd.Add(1).After(intervalToProcess.start) {
intervalToProcess.start = deletedIntervalEnd.Add(1)
}
deletedIntervalEnd = deletedIntervalEnd.Add(d.cfg.deleteRequestCreationInterval)
}
// keep building non-deleted intervals with each being from intervalToProcess.start to min(deletedIntervalStart.Start-1, intervalToProcess.end)
for !deletedIntervalStart.After(queryInterval.end) {
nonDeletedInterval := interval{intervalToProcess.start, deletedIntervalStart.Add(-1)}
if nonDeletedInterval.end.After(intervalToProcess.end) {
nonDeletedInterval.end = intervalToProcess.end
}
nonDeletedIntervals = append(nonDeletedIntervals, nonDeletedInterval)
intervalToProcess.start = deletedIntervalEnd.Add(1)
// build next deleted interval
deletedIntervalStart = deletedIntervalStart.Add(d.cfg.deleteRequestCreationInterval)
deletedIntervalEnd = deletedIntervalEnd.Add(d.cfg.deleteRequestCreationInterval)
}
// see if we have some interval left in intervalToProcess, add it if so.
if intervalToProcess.start.Before(intervalToProcess.end) {
nonDeletedIntervals = append(nonDeletedIntervals, intervalToProcess)
}
return nonDeletedIntervals
}
func (d *DeleteSeriesTest) MinQueryTime() time.Time {
return calculateMinQueryTime(d.cfg.durationQuerySince, d.cfg.timeQueryStart)
}
type interval struct {
start, end time.Time
}