enhance: Remove pool from produer and consumer in kafka client (#38264)

issue: #38263

Revert "fix: Move init kafka pool into once (#37786)"

Revert "enhance: Use pool to limit kafka cgo thread number (#37744)"

Signed-off-by: jaime <yun.zhang@zilliz.com>

pkg/mq/msgstream/mqwrapper/kafka/kafka_consumer.go

@@ -99,10 +99,7 @@ func newKafkaConsumer(config *kafka.ConfigMap, bufSize int64, topic string, grou
 
 func (kc *Consumer) createKafkaConsumer() error {
 	var err error
-	getPool().Submit(func() (any, error) {
 	kc.c, err = kafka.NewConsumer(kc.config)
-		return nil, err
-	}).Await()
 	if err != nil {
 		log.Error("create kafka consumer failed", zap.String("topic", kc.topic), zap.Error(err))
 		return err
@@ -136,12 +133,7 @@ func (kc *Consumer) Chan() <-chan common.Message {
 					return
 				default:
 					readTimeout := paramtable.Get().KafkaCfg.ReadTimeout.GetAsDuration(time.Second)
-					var e *kafka.Message
+					e, err := kc.c.ReadMessage(readTimeout)
-					var err error
-					getPool().Submit(func() (any, error) {
-						e, err = kc.c.ReadMessage(readTimeout)
-						return nil, err
-					}).Await()
 					if err != nil {
 						// if we failed to read message in 30 Seconds, print out a warn message since there should always be a tt
 						log.Warn("consume msg failed", zap.String("topic", kc.topic), zap.String("groupID", kc.groupID), zap.Error(err))
@@ -174,14 +166,14 @@ func (kc *Consumer) Seek(id common.MessageID, inclusive bool) error {
 }
 
 func (kc *Consumer) internalSeek(offset kafka.Offset, inclusive bool) error {
-	_, err := getPool().Submit(func() (any, error) {
 	log.Info("kafka consumer seek start", zap.String("topic name", kc.topic),
 		zap.Any("Msg offset", offset), zap.Bool("inclusive", inclusive))
+
 	start := time.Now()
 	err := kc.c.Assign([]kafka.TopicPartition{{Topic: &kc.topic, Partition: mqwrapper.DefaultPartitionIdx, Offset: offset}})
 	if err != nil {
 		log.Warn("kafka consumer assign failed ", zap.String("topic name", kc.topic), zap.Any("Msg offset", offset), zap.Error(err))
-			return nil, err
+		return err
 	}
 
 	cost := time.Since(start).Milliseconds()
@@ -198,16 +190,14 @@ func (kc *Consumer) internalSeek(offset kafka.Offset, inclusive bool) error {
 		Partition: mqwrapper.DefaultPartitionIdx,
 		Offset:    offset,
 	}, timeout); err != nil {
-			return nil, err
+		return err
 	}
 	cost = time.Since(start).Milliseconds()
 	log.Info("kafka consumer seek finished", zap.String("topic name", kc.topic),
 		zap.Any("Msg offset", offset), zap.Bool("inclusive", inclusive), zap.Int64("time cost(ms)", cost))
 
 	kc.hasAssign = true
-		return nil, nil
+	return nil
-	}).Await()
-	return err
 }
 
 func (kc *Consumer) Ack(message common.Message) {
@@ -217,13 +207,7 @@ func (kc *Consumer) Ack(message common.Message) {
 }
 
 func (kc *Consumer) GetLatestMsgID() (common.MessageID, error) {
-	var low, high int64
+	low, high, err := kc.c.QueryWatermarkOffsets(kc.topic, mqwrapper.DefaultPartitionIdx, timeout)
-	var err error
-
-	getPool().Submit(func() (any, error) {
-		low, high, err = kc.c.QueryWatermarkOffsets(kc.topic, mqwrapper.DefaultPartitionIdx, timeout)
-		return nil, err
-	}).Await()
 	if err != nil {
 		return nil, err
 	}
@@ -260,11 +244,7 @@ func (kc *Consumer) CheckTopicValid(topic string) error {
 func (kc *Consumer) closeInternal() {
 	log.Info("close consumer ", zap.String("topic", kc.topic), zap.String("groupID", kc.groupID))
 	start := time.Now()
-	var err error
+	err := kc.c.Close()
-	getPool().Submit(func() (any, error) {
-		err = kc.c.Close()
-		return nil, err
-	}).Await()
 	if err != nil {
 		log.Warn("failed to close ", zap.String("topic", kc.topic), zap.Error(err))
 	}

pkg/mq/msgstream/mqwrapper/kafka/kafka_producer.go

@@ -44,15 +44,11 @@ func (kp *kafkaProducer) Send(ctx context.Context, message *mqcommon.ProducerMes
 		header := kafka.Header{Key: key, Value: []byte(value)}
 		headers = append(headers, header)
 	}
-	var err error
+	err := kp.p.Produce(&kafka.Message{
-	getPool().Submit(func() (any, error) {
-		err = kp.p.Produce(&kafka.Message{
 		TopicPartition: kafka.TopicPartition{Topic: &kp.topic, Partition: mqwrapper.DefaultPartitionIdx},
 		Value:          message.Payload,
 		Headers:        headers,
 	}, kp.deliveryChan)
-		return nil, err
-	})
 	if err != nil {
 		metrics.MsgStreamOpCounter.WithLabelValues(metrics.SendMsgLabel, metrics.FailLabel).Inc()
 		return nil, err

pkg/mq/msgstream/mqwrapper/kafka/pool.go

@@ -1,54 +0,0 @@
-// Licensed to the LF AI & Data foundation under one
-// or more contributor license agreements. See the NOTICE file
-// distributed with this work for additional information
-// regarding copyright ownership. The ASF licenses this file
-// to you 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,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package kafka
-
-import (
-	"runtime"
-	"sync"
-
-	"go.uber.org/atomic"
-	"go.uber.org/zap"
-
-	"github.com/milvus-io/milvus/pkg/log"
-	"github.com/milvus-io/milvus/pkg/util/conc"
-	"github.com/milvus-io/milvus/pkg/util/hardware"
-)
-
-var (
-	kafkaCPool atomic.Pointer[conc.Pool[any]]
-	initOnce   sync.Once
-)
-
-func initPool() {
-	initOnce.Do(func() {
-		pool := conc.NewPool[any](
-			hardware.GetCPUNum(),
-			conc.WithPreAlloc(false),
-			conc.WithDisablePurge(false),
-			conc.WithPreHandler(runtime.LockOSThread), // lock os thread for cgo thread disposal
-		)
-
-		kafkaCPool.Store(pool)
-		log.Info("init dynamicPool done", zap.Int("size", hardware.GetCPUNum()))
-	})
-}
-
-// GetSQPool returns the singleton pool instance for search/query operations.
-func getPool() *conc.Pool[any] {
-	initPool()
-	return kafkaCPool.Load()
-}