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metrics_collector.go
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/
metrics_collector.go
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// Copyright 2023 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package v2
import (
"context"
"time"
"github.com/pingcap/log"
"github.com/pingcap/tiflow/cdc/model"
pkafka "github.com/pingcap/tiflow/pkg/sink/kafka"
"github.com/pingcap/tiflow/pkg/util"
"go.uber.org/zap"
)
// MetricsCollector is the kafka metrics collector based on kafka-go library.
type MetricsCollector struct {
changefeedID model.ChangeFeedID
role util.Role
writer Writer
}
// NewMetricsCollector return a kafka metrics collector
func NewMetricsCollector(
changefeedID model.ChangeFeedID,
role util.Role,
writer Writer,
) *MetricsCollector {
return &MetricsCollector{
changefeedID: changefeedID,
role: role,
writer: writer,
}
}
// Run implement the MetricsCollector interface
func (m *MetricsCollector) Run(ctx context.Context) {
ticker := time.NewTicker(pkafka.RefreshMetricsInterval)
defer func() {
ticker.Stop()
m.cleanupMetrics()
}()
for {
select {
case <-ctx.Done():
log.Info("Kafka metrics collector stopped",
zap.String("namespace", m.changefeedID.Namespace),
zap.String("changefeed", m.changefeedID.ID))
return
case <-ticker.C:
m.collectMetrics()
}
}
}
func (m *MetricsCollector) collectMetrics() {
statistics := m.writer.Stats()
// batch related metrics
pkafka.BatchDurationGauge.WithLabelValues(m.changefeedID.Namespace, m.changefeedID.ID).
Set(statistics.BatchQueueTime.Avg.Seconds())
pkafka.BatchMessageCountGauge.WithLabelValues(m.changefeedID.Namespace, m.changefeedID.ID).
Set(float64(statistics.BatchSize.Avg))
pkafka.BatchSizeGauge.WithLabelValues(m.changefeedID.Namespace, m.changefeedID.ID).
Set(float64(statistics.BatchBytes.Avg))
// send request related metrics.
// metrics is collected each 5 seconds, divide by 5 to get per seconds average.
// since kafka-go does not support per broker metrics, so we add `v2` as the broker ID.
pkafka.RequestRateGauge.WithLabelValues(m.changefeedID.Namespace, m.changefeedID.ID, "v2").
Set(float64(statistics.Writes / 5))
pkafka.RequestLatencyGauge.WithLabelValues(m.changefeedID.Namespace, m.changefeedID.ID, "v2").
Set(statistics.WriteTime.Avg.Seconds())
pkafka.OutgoingByteRateGauge.WithLabelValues(m.changefeedID.Namespace, m.changefeedID.ID, "v2").
Set(float64(statistics.Bytes / 5))
pkafka.ClientRetryGauge.WithLabelValues(m.changefeedID.Namespace, m.changefeedID.ID).
Set(float64(statistics.Retries))
pkafka.ClientErrorGauge.WithLabelValues(m.changefeedID.Namespace, m.changefeedID.ID).
Set(float64(statistics.Errors))
}
func (m *MetricsCollector) cleanupMetrics() {
pkafka.BatchDurationGauge.
DeleteLabelValues(m.changefeedID.Namespace, m.changefeedID.ID)
pkafka.BatchMessageCountGauge.
DeleteLabelValues(m.changefeedID.Namespace, m.changefeedID.ID)
pkafka.BatchSizeGauge.
DeleteLabelValues(m.changefeedID.Namespace, m.changefeedID.ID)
pkafka.RequestRateGauge.
DeleteLabelValues(m.changefeedID.Namespace, m.changefeedID.ID, "v2")
pkafka.RequestLatencyGauge.
DeleteLabelValues(m.changefeedID.Namespace, m.changefeedID.ID, "v2")
pkafka.OutgoingByteRateGauge.
DeleteLabelValues(m.changefeedID.Namespace, m.changefeedID.ID, "v2")
pkafka.ClientRetryGauge.DeleteLabelValues(m.changefeedID.Namespace, m.changefeedID.ID)
pkafka.ClientErrorGauge.DeleteLabelValues(m.changefeedID.Namespace, m.changefeedID.ID)
}