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Original file line number | Diff line number | Diff line change |
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@@ -1 +1,343 @@ | ||
package continuous_querier | ||
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import ( | ||
"errors" | ||
"log" | ||
"os" | ||
"strings" | ||
"sync" | ||
"time" | ||
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"github.com/influxdb/influxdb/cluster" | ||
"github.com/influxdb/influxdb/influxql" | ||
"github.com/influxdb/influxdb/meta" | ||
"github.com/influxdb/influxdb/tsdb" | ||
) | ||
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const ( | ||
// When planning a select statement, passing zero tells it not to chunk results. Only applies to raw queries | ||
NoChunkingSize = 0 | ||
) | ||
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// Service manages continuous query execution. | ||
type Service struct { | ||
MetaStore *meta.Store | ||
QueryExecutor *tsdb.QueryExecutor | ||
PointsWriter *cluster.PointsWriter | ||
Config *Config | ||
RunInterval time.Duration | ||
Logger *log.Logger | ||
// lastRuns maps CQ name to last time it was run. | ||
lastRuns map[string]time.Time | ||
stop chan struct{} | ||
wg *sync.WaitGroup | ||
} | ||
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// NewService returns a new instance of Service. | ||
func NewService(c Config) *Service { | ||
s := &Service{ | ||
Config: &c, | ||
RunInterval: time.Second, | ||
Logger: log.New(os.Stderr, "[continuous_querier] ", log.LstdFlags), | ||
lastRuns: map[string]time.Time{}, | ||
} | ||
return s | ||
} | ||
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// Open starts the service. | ||
func (s *Service) Open() error { | ||
if s.stop != nil { | ||
return nil | ||
} | ||
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if s.MetaStore == nil { | ||
panic("MetaStore is nil") | ||
} else if s.QueryExecutor == nil { | ||
panic("QueryExecutor is nil") | ||
} else if s.PointsWriter == nil { | ||
panic("PointsWriter is nil") | ||
} | ||
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s.stop = make(chan struct{}) | ||
s.wg = &sync.WaitGroup{} | ||
s.wg.Add(1) | ||
go s.backgroundLoop() | ||
return nil | ||
} | ||
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// Close stops the service. | ||
func (s *Service) Close() error { | ||
if s.stop == nil { | ||
return nil | ||
} | ||
close(s.stop) | ||
s.wg.Wait() | ||
s.wg = nil | ||
s.stop = nil | ||
return nil | ||
} | ||
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// backgroundLoop runs on a go routine and periodically executes CQs. | ||
func (s *Service) backgroundLoop() { | ||
defer s.wg.Done() | ||
for { | ||
select { | ||
case <-s.stop: | ||
return | ||
case <-time.After(s.RunInterval): | ||
if s.MetaStore.IsLeader() { | ||
s.runContinuousQueries() | ||
} | ||
} | ||
} | ||
} | ||
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// runContinuousQueries gets CQs from the meta store and runs them. | ||
func (s *Service) runContinuousQueries() { | ||
// Get list of all databases. | ||
dbs, err := s.MetaStore.Databases() | ||
if err != nil { | ||
s.Logger.Println("error getting databases") | ||
return | ||
} | ||
// Loop through all databases executing CQs. | ||
for _, db := range dbs { | ||
// TODO: distribute across nodes | ||
for _, cq := range db.ContinuousQueries { | ||
if err := s.ExecuteContinuousQuery(&db, &cq); err != nil { | ||
s.Logger.Println(err) | ||
} | ||
} | ||
} | ||
} | ||
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// ExecuteContinuousQuery executes a single CQ. | ||
func (s *Service) ExecuteContinuousQuery(dbi *meta.DatabaseInfo, cqi *meta.ContinuousQueryInfo) error { | ||
// TODO: re-enable stats | ||
//s.stats.Inc("continuousQueryExecuted") | ||
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// Local wrapper / helper. | ||
cq, err := NewContinuousQuery(dbi.Name, cqi) | ||
if err != nil { | ||
return err | ||
} | ||
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// Get the last time this CQ was run from the service's cache. | ||
cq.LastRun = s.lastRuns[cqi.Name] | ||
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// Set the retention policy to default if it wasn't specified in the query. | ||
if cq.intoRP() == "" { | ||
cq.setIntoRP(dbi.DefaultRetentionPolicy) | ||
} | ||
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// See if this query needs to be run. | ||
computeNoMoreThan := time.Duration(s.Config.ComputeNoMoreThan) | ||
if !cq.shouldRunContinuousQuery(s.Config.ComputeRunsPerInterval, computeNoMoreThan) { | ||
return nil | ||
} | ||
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// We're about to run the query so store the time. | ||
now := time.Now() | ||
cq.LastRun = now | ||
s.lastRuns[cqi.Name] = now | ||
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// Get the group by interval. | ||
interval, err := cq.q.GroupByInterval() | ||
if err != nil || interval == 0 { | ||
return nil | ||
} | ||
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// Calculate and set the time range for the query. | ||
startTime := now.Round(interval) | ||
if startTime.UnixNano() > now.UnixNano() { | ||
startTime = startTime.Add(-interval) | ||
} | ||
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if err := cq.q.SetTimeRange(startTime, startTime.Add(interval)); err != nil { | ||
s.Logger.Printf("error setting time range: %s\n", err) | ||
} | ||
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// Do the actual processing of the query & writing of results. | ||
if err := s.runContinuousQueryAndWriteResult(cq); err != nil { | ||
s.Logger.Printf("error: %s. running: %s\n", err, cq.q.String()) | ||
} | ||
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recomputeNoOlderThan := time.Duration(s.Config.RecomputeNoOlderThan) | ||
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for i := 0; i < s.Config.RecomputePreviousN; i++ { | ||
// if we're already more time past the previous window than we're going to look back, stop | ||
if now.Sub(startTime) > recomputeNoOlderThan { | ||
return nil | ||
} | ||
newStartTime := startTime.Add(-interval) | ||
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if err := cq.q.SetTimeRange(newStartTime, startTime); err != nil { | ||
s.Logger.Printf("error setting time range: %s\n", err) | ||
} | ||
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if err := s.runContinuousQueryAndWriteResult(cq); err != nil { | ||
s.Logger.Printf("error during recompute previous: %s. running: %s\n", err, cq.q.String()) | ||
} | ||
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startTime = newStartTime | ||
} | ||
return nil | ||
} | ||
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// runContinuousQueryAndWriteResult will run the query against the cluster and write the results back in | ||
func (s *Service) runContinuousQueryAndWriteResult(cq *ContinuousQuery) error { | ||
// Wrap the CQ's inner SELECT statement in a Query for the QueryExecutor. | ||
q := &influxql.Query{ | ||
Statements: influxql.Statements{cq.q}, | ||
} | ||
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// Execute the SELECT. | ||
ch, err := s.QueryExecutor.ExecuteQuery(q, cq.Database, NoChunkingSize) | ||
if err != nil { | ||
return err | ||
} | ||
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// Read all rows from the result channel. | ||
for result := range ch { | ||
if result.Err != nil { | ||
return result.Err | ||
} | ||
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for _, row := range result.Series { | ||
// Convert the result row to points. | ||
points, err := s.convertRowToPoints(cq.intoMeasurement(), row) | ||
if err != nil { | ||
log.Println(err) | ||
continue | ||
} | ||
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if len(points) == 0 { | ||
continue | ||
} | ||
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// If the points have any nil values, can't write. | ||
// This happens if the CQ is created and running before data is written to the measurement. | ||
for _, p := range points { | ||
fields := p.Fields() | ||
for _, v := range fields { | ||
if v == nil { | ||
return nil | ||
} | ||
} | ||
} | ||
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// Create a write request for the points. | ||
req := &cluster.WritePointsRequest{ | ||
Database: cq.intoDB(), | ||
RetentionPolicy: cq.intoRP(), | ||
ConsistencyLevel: cluster.ConsistencyLevelAny, | ||
Points: points, | ||
} | ||
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// Write the request. | ||
if err := s.PointsWriter.WritePoints(req); err != nil { | ||
s.Logger.Println(err) | ||
} | ||
} | ||
} | ||
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return nil | ||
} | ||
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// convertRowToPoints will convert a query result Row into Points that can be written back in. | ||
// Used for continuous and INTO queries | ||
func (s *Service) convertRowToPoints(measurementName string, row *influxql.Row) ([]tsdb.Point, error) { | ||
// figure out which parts of the result are the time and which are the fields | ||
timeIndex := -1 | ||
fieldIndexes := make(map[string]int) | ||
for i, c := range row.Columns { | ||
if c == "time" { | ||
timeIndex = i | ||
} else { | ||
fieldIndexes[c] = i | ||
} | ||
} | ||
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if timeIndex == -1 { | ||
return nil, errors.New("error finding time index in result") | ||
} | ||
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points := make([]tsdb.Point, 0, len(row.Values)) | ||
for _, v := range row.Values { | ||
vals := make(map[string]interface{}) | ||
for fieldName, fieldIndex := range fieldIndexes { | ||
vals[fieldName] = v[fieldIndex] | ||
} | ||
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p := tsdb.NewPoint(measurementName, row.Tags, vals, v[timeIndex].(time.Time)) | ||
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points = append(points, p) | ||
} | ||
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return points, nil | ||
} | ||
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// ContinuousQuery is a local wrapper / helper around continuous queries. | ||
type ContinuousQuery struct { | ||
Database string | ||
Info *meta.ContinuousQueryInfo | ||
LastRun time.Time | ||
q *influxql.SelectStatement | ||
} | ||
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func (cq *ContinuousQuery) intoDB() string { return cq.q.Target.Measurement.Database } | ||
func (cq *ContinuousQuery) intoRP() string { return cq.q.Target.Measurement.RetentionPolicy } | ||
func (cq *ContinuousQuery) setIntoRP(rp string) { cq.q.Target.Measurement.RetentionPolicy = rp } | ||
func (cq *ContinuousQuery) intoMeasurement() string { return cq.q.Target.Measurement.Name } | ||
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// NewContinuousQuery returns a ContinuousQuery object with a parsed influxql.CreateContinuousQueryStatement | ||
func NewContinuousQuery(database string, cqi *meta.ContinuousQueryInfo) (*ContinuousQuery, error) { | ||
stmt, err := influxql.NewParser(strings.NewReader(cqi.Query)).ParseStatement() | ||
if err != nil { | ||
return nil, err | ||
} | ||
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q, ok := stmt.(*influxql.SelectStatement) | ||
if !ok { | ||
return nil, errors.New("query isn't a valid continuous query") | ||
} | ||
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cquery := &ContinuousQuery{ | ||
Database: database, | ||
Info: cqi, | ||
q: q, | ||
} | ||
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return cquery, nil | ||
} | ||
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// shouldRunContinuousQuery returns true if the CQ should be schedule to run. It will use the | ||
// lastRunTime of the CQ and the rules for when to run set through the config to determine | ||
// if this CQ should be run | ||
func (cq *ContinuousQuery) shouldRunContinuousQuery(runsPerInterval int, noMoreThan time.Duration) bool { | ||
// if it's not aggregated we don't run it | ||
if cq.q.IsRawQuery { | ||
return false | ||
} | ||
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// since it's aggregated we need to figure how often it should be run | ||
interval, err := cq.q.GroupByInterval() | ||
if err != nil { | ||
return false | ||
} | ||
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// determine how often we should run this continuous query. | ||
// group by time / the number of times to compute | ||
computeEvery := time.Duration(interval.Nanoseconds()/int64(runsPerInterval)) * time.Nanosecond | ||
// make sure we're running no more frequently than the setting in the config | ||
if computeEvery < noMoreThan { | ||
computeEvery = noMoreThan | ||
} | ||
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// if we've passed the amount of time since the last run, do it up | ||
if cq.LastRun.Add(computeEvery).UnixNano() <= time.Now().UnixNano() { | ||
return true | ||
} | ||
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return false | ||
} |
!This change broke UDP support on RC32!