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  • Kafka 再均衡监听器示例

    原文:https://blog.csdn.net/weixin_44367006/article/details/103075173?utm_medium=distribute.pc_aggpage_search_result.none-task-blog-2~all~first_rank_v2~rank_v28-4-103075173.nonecase&utm_term=java%20kafka%E7%9B%91%E5%90%AC&spm=1000.2123.3001.4430

    Kafka 再均衡监听器示例

    依赖

    <dependency>
        <groupId>org.apache.kafka</groupId>
        <artifactId>kafka-clients</artifactId>
        <version>2.3.0</version>
    </dependency>
    
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    介绍

    本示例中,生产者发送50条消息给有3个消费者的群组。消费者群组中,第三个线程会中途退出群组,借此,我们可以观察分区再均衡现象。

    代码

    生产者

    import org.apache.kafka.clients.producer.*;
    import org.apache.kafka.common.serialization.StringSerializer;
    
    import java.util.Properties;
    import java.util.concurrent.CountDownLatch;
    import java.util.concurrent.ExecutorService;
    import java.util.concurrent.Executors;
    
    public class RebalanceProducer {
    
        private static final int MSG_SIZE = 50;
        private static ExecutorService executorService
                = Executors.newFixedThreadPool(
                        Runtime.getRuntime().availableProcessors());
        private static CountDownLatch countDownLatch
                = new CountDownLatch(MSG_SIZE);
    
    
    
    
        public static void main(String[] args) {
            Properties properties = new Properties();
            properties.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG,"192.168.100.14:9092");
            properties.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
            properties.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
            KafkaProducer<String,String> producer = new KafkaProducer(properties);
            try {
                for(int i=0;i<MSG_SIZE;i++){
                    ProducerRecord<String,String> record
                            = new ProducerRecord(
                            "rebalance-topic-three-part",
                            "value" + i);
                    executorService.submit(new ProduceWorker(record,producer,countDownLatch));
                    Thread.sleep(600);
                }
                countDownLatch.await();
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                producer.close();
                executorService.shutdown();
            }
        }
    }
    
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    生产任务

    import org.apache.kafka.clients.producer.Callback;
    import org.apache.kafka.clients.producer.KafkaProducer;
    import org.apache.kafka.clients.producer.ProducerRecord;
    import org.apache.kafka.clients.producer.RecordMetadata;
    
    import java.util.concurrent.CountDownLatch;
    
    public class ProduceWorker implements Runnable{
    
        private ProducerRecord<String,String> record;
        private KafkaProducer<String,String> producer;
        private  CountDownLatch countDownLatch;
        public ProduceWorker(ProducerRecord<String, String> record,
                             KafkaProducer<String, String> producer, CountDownLatch countDownLatch) {
            this.record = record;
            this.producer = producer;
            this.countDownLatch = countDownLatch;
        }
    
        public void run() {
            final String id = "" + Thread.currentThread().getId();
            try {
                producer.send(record, new Callback() {
                    public void onCompletion(RecordMetadata metadata,
                                             Exception exception) {
                        if(null!=exception){
                            exception.printStackTrace();
                        }
                        if(null!=metadata){
                            System.out.println(id+"|"
                                    +String.format("偏移量:%s,分区:%s",
                                    metadata.offset(),metadata.partition()));
                        }
                    }
                });
                System.out.println(id+":数据["+record.key()+ "-" + record.value()+"]已发送。");
                countDownLatch.countDown();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
    
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    消费者

    import org.apache.kafka.clients.consumer.ConsumerConfig;
    import org.apache.kafka.common.serialization.StringDeserializer;
    
    import java.util.Properties;
    import java.util.concurrent.ExecutorService;
    import java.util.concurrent.Executors;
    
    public class RebalanceConsumer {
    
        public static final String GROUP_ID = "RebalanceConsumer";
        private static ExecutorService executorService
                = Executors.newFixedThreadPool(3);
    
    
        public static void main(String[] args) throws InterruptedException {
            Properties properties = new Properties();
            properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,"192.168.100.14:9092");
            properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
            properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
            properties.put(ConsumerConfig.GROUP_ID_CONFIG, RebalanceConsumer.GROUP_ID);
            properties.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, false);
            for(int i = 0; i < 2; i++){
                executorService.submit(new ConsumerWorker(false, properties));
            }
            Thread.sleep(5000);
            //用来被停止,观察保持运行的消费者情况
            new Thread(new ConsumerWorker(true, properties)).start();
        }
    }
    
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    消费任务

    import org.apache.kafka.clients.consumer.*;
    import org.apache.kafka.common.TopicPartition;
    import org.apache.kafka.common.serialization.StringDeserializer;
    
    import java.time.Duration;
    import java.util.Collections;
    import java.util.HashMap;
    import java.util.Map;
    import java.util.Properties;
    
    public class ConsumerWorker  implements Runnable{
    
        private final KafkaConsumer<String,String> consumer;
        /*用来保存每个消费者当前读取分区的偏移量*/
        private final Map<TopicPartition, OffsetAndMetadata> currOffsets;
        private final boolean isStop;
        /*消息消费者配置*/
    
    
        public ConsumerWorker(boolean isStop, Properties properties) {
    
    
            this.isStop = isStop;
            this.consumer
                    = new KafkaConsumer(properties);
            this.currOffsets
                    = new HashMap();
            consumer.subscribe(Collections.singletonList("rebalance-topic-three-part"),
                    new HandlerRebalance(currOffsets,consumer));
        }
    
        public void run() {
            final String id = "" + Thread.currentThread().getId();
            int count = 0;
            TopicPartition topicPartition;
            long offset;
            try {
                while(true){
                    ConsumerRecords<String, String> records
                            = consumer.poll(Duration.ofMillis(500));
                    //业务处理
                    //开始事务
                    for(ConsumerRecord<String, String> record:records){
                        System.out.println(id+"|"+String.format(
                                "处理主题:%s,分区:%d,偏移量:%d," +
                                        "key:%s,value:%s",
                                record.topic(),record.partition(),
                                record.offset(),record.key(),record.value()));
                        topicPartition = new TopicPartition(record.topic(),
                                record.partition());
                        offset = record.offset()+1;
                        currOffsets.put(topicPartition,new OffsetAndMetadata(offset,
                                "no"));
                        count++;
                        //执行业务sql
                    }
                    if(currOffsets.size()>0){
                        for(TopicPartition topicPartitionkey:currOffsets.keySet()){
                            HandlerRebalance.partitionOffsetMap.put(topicPartitionkey,
                                    currOffsets.get(topicPartitionkey).offset());
                        }
                        //提交事务,同时将业务和偏移量入库
                    }
                    //如果stop参数为true,这个消费者消费到第5个时自动关闭
                    if(isStop&&count>=5){
                        System.out.println(id+"-将关闭,当前偏移量为:"+currOffsets);
                        consumer.commitSync();
                        break;
                    }
                    consumer.commitSync();
                }
            } finally {
                consumer.close();
            }
        }
    }
    
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    再均衡监听器

    import org.apache.kafka.clients.consumer.ConsumerRebalanceListener;
    import org.apache.kafka.clients.consumer.KafkaConsumer;
    import org.apache.kafka.clients.consumer.OffsetAndMetadata;
    import org.apache.kafka.common.TopicPartition;
    
    import java.util.Collection;
    import java.util.Map;
    import java.util.concurrent.ConcurrentHashMap;
    
    public class HandlerRebalance implements ConsumerRebalanceListener {
    
        private final Map<TopicPartition, OffsetAndMetadata> currOffsets;
        private final KafkaConsumer<String,String> consumer;
        //private final Transaction  tr事务类的实例
    
        public HandlerRebalance(Map<TopicPartition, OffsetAndMetadata> currOffsets,
                                KafkaConsumer<String, String> consumer) {
            this.currOffsets = currOffsets;
            this.consumer = consumer;
        }
    
        /*模拟一个保存分区偏移量的数据库表*/
        public final static ConcurrentHashMap<TopicPartition,Long>
                partitionOffsetMap = new ConcurrentHashMap();
    
        //分区再均衡之前
        public void onPartitionsRevoked(
                Collection<TopicPartition> partitions) {
            final String id = Thread.currentThread().getId()+"";
            System.out.println(id+"-onPartitionsRevoked参数值为:"+partitions);
            System.out.println(id+"-服务器准备分区再均衡,提交偏移量。当前偏移量为:"
                    +currOffsets);
            //开始事务
            //偏移量写入数据库
            System.out.println("分区偏移量表中:"+partitionOffsetMap);
            for(TopicPartition topicPartition:partitions){
                partitionOffsetMap.put(topicPartition,
                        currOffsets.get(topicPartition).offset());
            }
            consumer.commitSync(currOffsets);
            //提交业务数和偏移量入库  tr.commit
        }
    
        //分区再均衡完成以后
        public void onPartitionsAssigned(
                Collection<TopicPartition> partitions) {
            final String id = "" + Thread.currentThread().getId();
            System.out.println(id+"-再均衡完成,onPartitionsAssigned参数值为:"+partitions);
            System.out.println("分区偏移量表中:"+partitionOffsetMap);
            for(TopicPartition topicPartition:partitions){
                System.out.println(id+"-topicPartition"+topicPartition);
                //模拟从数据库中取得上次的偏移量
                Long offset = partitionOffsetMap.get(topicPartition);
                if(offset==null) continue;
                //从特定偏移量处开始记录 (从指定分区中的指定偏移量开始消费)
                //这样就可以确保分区再均衡中的数据不错乱
                consumer.seek(topicPartition,partitionOffsetMap.get(topicPartition));
            }
        }
    }
    
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    结果

    生产者

    14:数据[null-value0]已发送。
    14|偏移量:51,分区:0
    15:数据[null-value1]已发送。
    15|偏移量:51,分区:2
    16:数据[null-value2]已发送。
    16|偏移量:49,分区:1
    17:数据[null-value3]已发送。
    17|偏移量:52,分区:0
    18:数据[null-value4]已发送。
    18|偏移量:52,分区:2
    19:数据[null-value5]已发送。
    19|偏移量:50,分区:1
    20:数据[null-value6]已发送。
    20|偏移量:53,分区:0
    21:数据[null-value7]已发送。
    21|偏移量:53,分区:2
    14:数据[null-value8]已发送。
    14|偏移量:51,分区:1
    15:数据[null-value9]已发送。
    15|偏移量:54,分区:0
    16:数据[null-value10]已发送。
    16|偏移量:54,分区:2
    17:数据[null-value11]已发送。
    17|偏移量:52,分区:1
    18:数据[null-value12]已发送。
    19:数据[null-value13]已发送。
    20:数据[null-value14]已发送。
    18|偏移量:55,分区:0
    21:数据[null-value15]已发送。
    14:数据[null-value16]已发送。
    19|偏移量:55,分区:2
    20|偏移量:53,分区:1
    21|偏移量:56,分区:0
    14|偏移量:56,分区:2
    15:数据[null-value17]已发送。
    15|偏移量:54,分区:1
    16:数据[null-value18]已发送。
    16|偏移量:57,分区:0
    17:数据[null-value19]已发送。
    17|偏移量:57,分区:2
    18:数据[null-value20]已发送。
    19:数据[null-value21]已发送。
    18|偏移量:55,分区:1
    19|偏移量:58,分区:0
    20:数据[null-value22]已发送。
    20|偏移量:58,分区:2
    21:数据[null-value23]已发送。
    21|偏移量:56,分区:1
    14:数据[null-value24]已发送。
    14|偏移量:59,分区:0
    15:数据[null-value25]已发送。
    15|偏移量:59,分区:2
    16:数据[null-value26]已发送。
    16|偏移量:57,分区:1
    17:数据[null-value27]已发送。
    17|偏移量:60,分区:0
    18:数据[null-value28]已发送。
    18|偏移量:60,分区:2
    19:数据[null-value29]已发送。
    19|偏移量:58,分区:1
    20:数据[null-value30]已发送。
    20|偏移量:61,分区:0
    21:数据[null-value31]已发送。
    21|偏移量:61,分区:2
    14:数据[null-value32]已发送。
    14|偏移量:59,分区:1
    15:数据[null-value33]已发送。
    15|偏移量:62,分区:0
    16:数据[null-value34]已发送。
    16|偏移量:62,分区:2
    17:数据[null-value35]已发送。
    17|偏移量:60,分区:1
    18:数据[null-value36]已发送。
    18|偏移量:63,分区:0
    19:数据[null-value37]已发送。
    19|偏移量:63,分区:2
    20:数据[null-value38]已发送。
    20|偏移量:61,分区:1
    21:数据[null-value39]已发送。
    21|偏移量:64,分区:0
    14:数据[null-value40]已发送。
    14|偏移量:64,分区:2
    15:数据[null-value41]已发送。
    15|偏移量:62,分区:1
    16:数据[null-value42]已发送。
    16|偏移量:65,分区:0
    17:数据[null-value43]已发送。
    17|偏移量:65,分区:2
    18:数据[null-value44]已发送。
    18|偏移量:63,分区:1
    19:数据[null-value45]已发送。
    19|偏移量:66,分区:0
    20:数据[null-value46]已发送。
    20|偏移量:66,分区:2
    21:数据[null-value47]已发送。
    21|偏移量:64,分区:1
    14:数据[null-value48]已发送。
    14|偏移量:67,分区:0
    15:数据[null-value49]已发送。
    15|偏移量:67,分区:2
    
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    消费者

    启动生产者之前

    13-onPartitionsRevoked参数值为:[]
    14-onPartitionsRevoked参数值为:[]
    13-服务器准备分区再均衡,提交偏移量。当前偏移量为:{}
    14-服务器准备分区再均衡,提交偏移量。当前偏移量为:{}
    分区偏移量表中:{}
    分区偏移量表中:{}
    17-onPartitionsRevoked参数值为:[]
    17-服务器准备分区再均衡,提交偏移量。当前偏移量为:{}
    分区偏移量表中:{}
    14-再均衡完成,onPartitionsAssigned参数值为:[rebalance-topic-three-part-1]
    分区偏移量表中:{}
    14-topicPartitionrebalance-topic-three-part-1
    17-再均衡完成,onPartitionsAssigned参数值为:[rebalance-topic-three-part-2]
    分区偏移量表中:{}
    13-再均衡完成,onPartitionsAssigned参数值为:[rebalance-topic-three-part-0]
    分区偏移量表中:{}
    13-topicPartitionrebalance-topic-three-part-0
    17-topicPartitionrebalance-topic-three-part-2
    
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    线程13 —— 分区0
    线程14 —— 分区1
    线程17 —— 分区2

    启动生产者后,第三线程关闭之前

    13|处理主题:rebalance-topic-three-part,分区:0,偏移量:51,key:null,value:value0
    17|处理主题:rebalance-topic-three-part,分区:2,偏移量:51,key:null,value:value1
    14|处理主题:rebalance-topic-three-part,分区:1,偏移量:49,key:null,value:value2
    13|处理主题:rebalance-topic-three-part,分区:0,偏移量:52,key:null,value:value3
    17|处理主题:rebalance-topic-three-part,分区:2,偏移量:52,key:null,value:value4
    14|处理主题:rebalance-topic-three-part,分区:1,偏移量:50,key:null,value:value5
    13|处理主题:rebalance-topic-three-part,分区:0,偏移量:53,key:null,value:value6
    17|处理主题:rebalance-topic-three-part,分区:2,偏移量:53,key:null,value:value7
    14|处理主题:rebalance-topic-three-part,分区:1,偏移量:51,key:null,value:value8
    13|处理主题:rebalance-topic-three-part,分区:0,偏移量:54,key:null,value:value9
    17|处理主题:rebalance-topic-three-part,分区:2,偏移量:54,key:null,value:value10
    14|处理主题:rebalance-topic-three-part,分区:1,偏移量:52,key:null,value:value11
    13|处理主题:rebalance-topic-three-part,分区:0,偏移量:55,key:null,value:value12
    17|处理主题:rebalance-topic-three-part,分区:2,偏移量:55,key:null,value:value13
    //注意这里,上面17处理的偏移量是55,处理完后,偏移量到了56,如下
    17-将关闭,当前偏移量为:{rebalance-topic-three-part-2=OffsetAndMetadata{offset=56, leaderEpoch=null, metadata='no'}}
    14|处理主题:rebalance-topic-three-part,分区:1,偏移量:53,key:null,value:value14
    13|处理主题:rebalance-topic-three-part,分区:0,偏移量:56,key:null,value:value15
    //同17,处理完后,偏移量是57
    14|处理主题:rebalance-topic-three-part,分区:1,偏移量:54,key:null,value:value17
    //处理完后,偏移量是58
    13|处理主题:rebalance-topic-three-part,分区:0,偏移量:57,key:null,value:value18
    
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    • 13
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    线程13 —— 分区0 —— 偏移量 58
    线程14 —— 分区1 —— 偏移量 55
    线程17 —— 分区2 —— 偏移量 56

    第三线程关闭后,分区再平衡

    13-onPartitionsRevoked参数值为:[rebalance-topic-three-part-0]
    14-onPartitionsRevoked参数值为:[rebalance-topic-three-part-1]
    13-服务器准备分区再均衡,提交偏移量。当前偏移量为:{rebalance-topic-three-part-0=OffsetAndMetadata{offset=58, leaderEpoch=null, metadata='no'}}
    分区偏移量表中:{rebalance-topic-three-part-2=56, rebalance-topic-three-part-1=55, rebalance-topic-three-part-0=58}
    14-服务器准备分区再均衡,提交偏移量。当前偏移量为:{rebalance-topic-three-part-1=OffsetAndMetadata{offset=55, leaderEpoch=null, metadata='no'}}
    分区偏移量表中:{rebalance-topic-three-part-2=56, rebalance-topic-three-part-1=55, rebalance-topic-three-part-0=58}
    14-再均衡完成,onPartitionsAssigned参数值为:[rebalance-topic-three-part-2]
    13-再均衡完成,onPartitionsAssigned参数值为:[rebalance-topic-three-part-1, rebalance-topic-three-part-0]
    分区偏移量表中:{rebalance-topic-three-part-2=56, rebalance-topic-three-part-1=55, rebalance-topic-three-part-0=58}
    13-topicPartitionrebalance-topic-three-part-1
    分区偏移量表中:{rebalance-topic-three-part-2=56, rebalance-topic-three-part-1=55, rebalance-topic-three-part-0=58}
    14-topicPartitionrebalance-topic-three-part-2
    13-topicPartitionrebalance-topic-three-part-0
    
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    线程13 —— 分区0 —— 偏移量 58 —— 分区1 —— 偏移量 —— 55
    线程14 —— 分区2 —— 偏移量 56

    分区再平衡之后

    线程13 —— 分区0 —— 偏移量 58 —— 分区1 —— 偏移量 —— 55
    线程14 —— 分区2 —— 偏移量 56

    14|处理主题:rebalance-topic-three-part,分区:2,偏移量:56,key:null,value:value16
    14|处理主题:rebalance-topic-three-part,分区:2,偏移量:57,key:null,value:value19
    13|处理主题:rebalance-topic-three-part,分区:1,偏移量:55,key:null,value:value20
    13|处理主题:rebalance-topic-three-part,分区:0,偏移量:58,key:null,value:value21
    14|处理主题:rebalance-topic-three-part,分区:2,偏移量:58,key:null,value:value22
    13|处理主题:rebalance-topic-three-part,分区:1,偏移量:56,key:null,value:value23
    13|处理主题:rebalance-topic-three-part,分区:0,偏移量:59,key:null,value:value24
    14|处理主题:rebalance-topic-three-part,分区:2,偏移量:59,key:null,value:value25
    13|处理主题:rebalance-topic-three-part,分区:1,偏移量:57,key:null,value:value26
    13|处理主题:rebalance-topic-three-part,分区:0,偏移量:60,key:null,value:value27
    14|处理主题:rebalance-topic-three-part,分区:2,偏移量:60,key:null,value:value28
    13|处理主题:rebalance-topic-three-part,分区:1,偏移量:58,key:null,value:value29
    13|处理主题:rebalance-topic-three-part,分区:0,偏移量:61,key:null,value:value30
    14|处理主题:rebalance-topic-three-part,分区:2,偏移量:61,key:null,value:value31
    13|处理主题:rebalance-topic-three-part,分区:1,偏移量:59,key:null,value:value32
    13|处理主题:rebalance-topic-three-part,分区:0,偏移量:62,key:null,value:value33
    14|处理主题:rebalance-topic-three-part,分区:2,偏移量:62,key:null,value:value34
    13|处理主题:rebalance-topic-three-part,分区:1,偏移量:60,key:null,value:value35
    13|处理主题:rebalance-topic-three-part,分区:0,偏移量:63,key:null,value:value36
    14|处理主题:rebalance-topic-three-part,分区:2,偏移量:63,key:null,value:value37
    13|处理主题:rebalance-topic-three-part,分区:1,偏移量:61,key:null,value:value38
    13|处理主题:rebalance-topic-three-part,分区:0,偏移量:64,key:null,value:value39
    14|处理主题:rebalance-topic-three-part,分区:2,偏移量:64,key:null,value:value40
    13|处理主题:rebalance-topic-three-part,分区:1,偏移量:62,key:null,value:value41
    13|处理主题:rebalance-topic-three-part,分区:0,偏移量:65,key:null,value:value42
    14|处理主题:rebalance-topic-three-part,分区:2,偏移量:65,key:null,value:value43
    13|处理主题:rebalance-topic-three-part,分区:1,偏移量:63,key:null,value:value44
    13|处理主题:rebalance-topic-three-part,分区:0,偏移量:66,key:null,value:value45
    14|处理主题:rebalance-topic-three-part,分区:2,偏移量:66,key:null,value:value46
    13|处理主题:rebalance-topic-three-part,分区:1,偏移量:64,key:null,value:value47
    13|处理主题:rebalance-topic-three-part,分区:0,偏移量:67,key:null,value:value48
    14|处理主题:rebalance-topic-three-part,分区:2,偏移量:67,key:null,value:value49
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  • 原文地址:https://www.cnblogs.com/xiami2046/p/13940653.html
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