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query_task.go
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query_task.go
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package tasks
import (
"context"
"fmt"
"strconv"
"time"
"github.com/samber/lo"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/trace"
"github.com/milvus-io/milvus-proto/go-api/v2/commonpb"
"github.com/milvus-io/milvus/internal/proto/internalpb"
"github.com/milvus-io/milvus/internal/proto/querypb"
"github.com/milvus-io/milvus/internal/proto/segcorepb"
"github.com/milvus-io/milvus/internal/querynodev2/collector"
"github.com/milvus-io/milvus/internal/querynodev2/segments"
"github.com/milvus-io/milvus/pkg/metrics"
"github.com/milvus-io/milvus/pkg/util/merr"
"github.com/milvus-io/milvus/pkg/util/metricsinfo"
"github.com/milvus-io/milvus/pkg/util/paramtable"
"github.com/milvus-io/milvus/pkg/util/timerecord"
"github.com/milvus-io/milvus/pkg/util/typeutil"
)
var _ Task = &QueryTask{}
func NewQueryTask(ctx context.Context,
collection *segments.Collection,
manager *segments.Manager,
req *querypb.QueryRequest,
) *QueryTask {
ctx, span := otel.Tracer(typeutil.QueryNodeRole).Start(ctx, "schedule")
return &QueryTask{
ctx: ctx,
collection: collection,
segmentManager: manager,
req: req,
notifier: make(chan error, 1),
tr: timerecord.NewTimeRecorderWithTrace(ctx, "queryTask"),
scheduleSpan: span,
}
}
type QueryTask struct {
ctx context.Context
collection *segments.Collection
segmentManager *segments.Manager
req *querypb.QueryRequest
result *internalpb.RetrieveResults
notifier chan error
tr *timerecord.TimeRecorder
scheduleSpan trace.Span
}
// Return the username which task is belong to.
// Return "" if the task do not contain any user info.
func (t *QueryTask) Username() string {
return t.req.Req.GetUsername()
}
func (t *QueryTask) IsGpuIndex() bool {
return false
}
// PreExecute the task, only call once.
func (t *QueryTask) PreExecute() error {
// Update task wait time metric before execute
nodeID := strconv.FormatInt(paramtable.GetNodeID(), 10)
inQueueDuration := t.tr.ElapseSpan()
inQueueDurationMS := inQueueDuration.Seconds() * 1000
// Update in queue metric for prometheus.
metrics.QueryNodeSQLatencyInQueue.WithLabelValues(
nodeID,
metrics.QueryLabel,
t.collection.GetDBName(),
t.collection.GetResourceGroup(), // TODO: resource group and db name may be removed at runtime.
// should be refactor into metricsutil.observer in the future.
).Observe(inQueueDurationMS)
username := t.Username()
metrics.QueryNodeSQPerUserLatencyInQueue.WithLabelValues(
nodeID,
metrics.QueryLabel,
username).
Observe(inQueueDurationMS)
// Update collector for query node quota.
collector.Average.Add(metricsinfo.QueryQueueMetric, float64(inQueueDuration.Microseconds()))
return nil
}
func (t *QueryTask) SearchResult() *internalpb.SearchResults {
return nil
}
// Execute the task, only call once.
func (t *QueryTask) Execute() error {
if t.scheduleSpan != nil {
t.scheduleSpan.End()
}
tr := timerecord.NewTimeRecorderWithTrace(t.ctx, "QueryTask")
retrievePlan, err := segments.NewRetrievePlan(
t.ctx,
t.collection,
t.req.Req.GetSerializedExprPlan(),
t.req.Req.GetMvccTimestamp(),
t.req.Req.Base.GetMsgID(),
)
if err != nil {
return err
}
defer retrievePlan.Delete()
results, pinnedSegments, err := segments.Retrieve(t.ctx, t.segmentManager, retrievePlan, t.req)
defer t.segmentManager.Segment.Unpin(pinnedSegments)
if err != nil {
return err
}
reducer := segments.CreateSegCoreReducer(
t.req,
t.collection.Schema(),
)
beforeReduce := time.Now()
reduceResults := make([]*segcorepb.RetrieveResults, 0, len(results))
querySegments := make([]segments.Segment, 0, len(results))
for _, result := range results {
reduceResults = append(reduceResults, result.Result)
querySegments = append(querySegments, result.Segment)
}
reducedResult, err := reducer.Reduce(t.ctx, reduceResults, querySegments, retrievePlan)
metrics.QueryNodeReduceLatency.WithLabelValues(
fmt.Sprint(paramtable.GetNodeID()),
metrics.QueryLabel,
metrics.ReduceSegments,
metrics.BatchReduce).Observe(float64(time.Since(beforeReduce).Milliseconds()))
if err != nil {
return err
}
relatedDataSize := lo.Reduce(querySegments, func(acc int64, seg segments.Segment, _ int) int64 {
return acc + segments.GetSegmentRelatedDataSize(seg)
}, 0)
t.result = &internalpb.RetrieveResults{
Base: &commonpb.MsgBase{
SourceID: paramtable.GetNodeID(),
},
Status: merr.Success(),
Ids: reducedResult.Ids,
FieldsData: reducedResult.FieldsData,
CostAggregation: &internalpb.CostAggregation{
ServiceTime: tr.ElapseSpan().Milliseconds(),
TotalRelatedDataSize: relatedDataSize,
},
AllRetrieveCount: reducedResult.GetAllRetrieveCount(),
}
return nil
}
func (t *QueryTask) Done(err error) {
t.notifier <- err
}
func (t *QueryTask) Canceled() error {
return t.ctx.Err()
}
func (t *QueryTask) Wait() error {
return <-t.notifier
}
func (t *QueryTask) Result() *internalpb.RetrieveResults {
return t.result
}
func (t *QueryTask) NQ() int64 {
return 1
}