|NO.Z.00021|——————————|BigDataEnd|——|Hadoop&Flink.V05|——|Flink.v05|API详解|Flink DataStream|DataSource|自定义数据源.V2|

一、DataSource自定义数据源

### --- 自定义输入

~~~     可以使用StreamExecutionEnvironment.addSource(sourceFunction)将一个流式数据源加到程序中。
~~~     Flink提供了许多预先实现的源函数，但是也可以编写自己的自定义源，
~~~     方法是为非并行源implements SourceFunction，
~~~     或者为并行源 implements ParallelSourceFunction接口，或者extends RichParallelSourceFunction。
~~~     Flink也提供了一批内置的Connector（连接器），

二、如下表列了几个主要的

连接器	是否提供Source支持	是否提供Slnk
Apache Kafka	是	是
ElasticSearch	否	是
HDFS	否	是
Twitter Streaming PI	是	否

三、编程代码实现：kafka连接器

### --- 在pom.xml下导入kafka连接器依赖包

        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-hadoop-compatibility_2.11</artifactId>
            <version>1.11.1</version>
        </dependency>

四、编程代码实现

### --- 编程代码实现

package com.yanqi.streamdatasource;

import org.apache.flink.api.common.functions.FlatMapFunction;
import org.apache.flink.api.common.functions.MapFunction;
import org.apache.flink.api.common.functions.RichFlatMapFunction;
import org.apache.flink.api.common.restartstrategy.RestartStrategies;
import org.apache.flink.api.common.serialization.SimpleStringSchema;
import org.apache.flink.api.common.state.ValueState;
import org.apache.flink.api.common.state.ValueStateDescriptor;
import org.apache.flink.api.common.typeinfo.TypeHint;
import org.apache.flink.api.common.typeinfo.TypeInformation;
import org.apache.flink.api.java.functions.KeySelector;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.core.fs.Path;
import org.apache.flink.runtime.executiongraph.restart.RestartStrategy;
import org.apache.flink.runtime.state.filesystem.FsStateBackend;
import org.apache.flink.runtime.state.memory.MemoryStateBackend;
import org.apache.flink.streaming.api.CheckpointingMode;
import org.apache.flink.streaming.api.datastream.DataStreamSource;
import org.apache.flink.streaming.api.datastream.KeyedStream;
import org.apache.flink.streaming.api.datastream.SingleOutputStreamOperator;
import org.apache.flink.streaming.api.environment.CheckpointConfig;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer;
import org.apache.flink.streaming.connectors.kafka.internals.KafkaTopicPartition;
import org.apache.flink.util.Collector;

import java.util.HashMap;
import java.util.Properties;

public class SourceFromKafka {
    public static void main(String[] args) throws Exception {
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        env.enableCheckpointing(5000);
        long checkpointInterval = env.getCheckpointConfig().getCheckpointInterval();

        System.out.println("checkpointInterval:" + checkpointInterval + "..." + env.getCheckpointConfig().getCheckpointingMode());

        CheckpointConfig config = env.getCheckpointConfig();
        // 确保检查点之间有至少500 ms的间隔【checkpoint最小间隔】
        config.setMinPauseBetweenCheckpoints(500);
        // 检查点必须在一分钟内完成，或者被丢弃【checkpoint的超时时间】
        config.setCheckpointTimeout(60000);
        // 同一时间只允许进行一个检查点
        config.setMaxConcurrentCheckpoints(1);
//        env.setRestartStrategy(new RestartStrategies.NoRestartStrategyConfiguration());
        // 设置模式为exactly-once
        config.setCheckpointingMode(CheckpointingMode.EXACTLY_ONCE);
        // 设置checkpoint的周期, 每隔1000 ms进行启动一个检查点
        config.setCheckpointInterval(1000);
        long checkpointInterval1 = config.getCheckpointInterval();
        System.out.println("......after:" + checkpointInterval1);
        // 任务流取消和故障时会保留Checkpoint数据，以便根据实际需要恢复到指定的Checkpoint，即退出后不删除checkpoint
        config.enableExternalizedCheckpoints(CheckpointConfig.ExternalizedCheckpointCleanup.RETAIN_ON_CANCELLATION);
//        String checkPointPath = new Path("hdfs://");
        FsStateBackend fsStateBackend = new FsStateBackend(new Path("hdfs:hadoop01:9000/flink/checkpoints"));
        env.setStateBackend(fsStateBackend);
//        env.setStateBackend(new MemoryStateBackend());


        String topic = "lucasone";
        Properties props = new Properties();
        props.setProperty("bootstrap.servers","hadoop02:9092");
        props.setProperty("group.id","mygp");

        FlinkKafkaConsumer<String> consumer = new FlinkKafkaConsumer<String>(topic, new SimpleStringSchema(), props);
        consumer.setStartFromGroupOffsets();
        consumer.setCommitOffsetsOnCheckpoints(true);
//        consumer.setStartFromLatest();
//        consumer.setStartFromEarliest();
        //从指定offset位置开始消费
        /*HashMap<KafkaTopicPartition, Long> specifiStartOffsets = new HashMap<>();
        specifiStartOffsets.put(new KafkaTopicPartition("animal",0),558L);
//        specifiStartOffsets.put(new KafkaTopicPartition("animal",1),0L);
//        specifiStartOffsets.put(new KafkaTopicPartition("animal",2),43L);
        consumer.setStartFromSpecificOffsets(specifiStartOffsets);*/

        DataStreamSource<String> data = env.addSource(consumer);
        int parallelism = data.getParallelism();
        System.out.println("...parallelism" + parallelism);

        SingleOutputStreamOperator<Tuple2<Long, Long>> maped = data.map(new MapFunction<String, Tuple2<Long, Long>>() {
            @Override
            public Tuple2<Long, Long> map(String value) throws Exception {
                System.out.println(value);

                Tuple2<Long,Long> t = new Tuple2<Long,Long>( 0L, 0L );
                String[] split = value.split(",");

                try{
                    t = new Tuple2<Long, Long>(Long.valueOf(split[0]), Long.valueOf(split[1]));
                } catch (Exception e) {
                    e.printStackTrace();
                }
                return t;


            }
        });
        KeyedStream<Tuple2<Long,Long>, Long> keyed = maped.keyBy(value -> value.f0);


        /*SingleOutputStreamOperator<Tuple2<String, Integer>> wordAndeOne = data.flatMap(new FlatMapFunction<String, Tuple2<String, Integer>>() {

            public void flatMap(String s, Collector<Tuple2<String, Integer>> collector) throws Exception {
                for (String word : s.split(",")) {
                    collector.collect(new Tuple2<String, Integer>(word, 1));
                }
            }
        });*/

        /*KeyedStream<Tuple2<String, Integer>, String> tuple2StringKeyedStream = wordAndeOne.keyBy(new KeySelector<Tuple2<String, Integer>, String>() {

            public String getKey(Tuple2<String, Integer> value) throws Exception {
                return value.f0;
            }
        });*/

//        SingleOutputStreamOperator<Tuple2<String, Integer>> result = tuple2StringKeyedStream.sum(1);
//        result.print();

        //按照key分组策略，对流式数据调用状态化处理
        SingleOutputStreamOperator<Tuple2<Long, Long>> flatMaped = keyed.flatMap(new RichFlatMapFunction<Tuple2<Long, Long>, Tuple2<Long, Long>>() {
            ValueState<Tuple2<Long, Long>> sumState;

            @Override
            public void open(Configuration parameters) throws Exception {
                //在open方法中做出State
                ValueStateDescriptor<Tuple2<Long, Long>> descriptor = new ValueStateDescriptor<>(
                        "average",
                        TypeInformation.of(new TypeHint<Tuple2<Long, Long>>() {
                        }),
                        Tuple2.of(0L, 0L)
                );

                sumState = getRuntimeContext().getState(descriptor);
//                super.open(parameters);
            }

            @Override
            public void flatMap(Tuple2<Long, Long> value, Collector<Tuple2<Long, Long>> out) throws Exception {
                //在flatMap方法中，更新State
                Tuple2<Long, Long> currentSum = sumState.value();

                currentSum.f0 += 1;
                currentSum.f1 += value.f1;

                sumState.update(currentSum);
                out.collect(currentSum);


                /*if (currentSum.f0 == 2) {
                    long avarage = currentSum.f1 / currentSum.f0;
                    out.collect(new Tuple2<>(value.f0, avarage));
                    sumState.clear();
                }*/

            }
        });

        flatMaped.print();

        env.execute();
    }
}

五、编译打印

### --- 在Hadoop02下启动kafka服务

~~~     # 在hdfs下创建目录
[root@hadoop01 ~]# hdfs dfs -mkdir -p  /flink/checkpoints

~~~     # 在所有主机下启动kafka服务

[root@hadoop01 ~]# cd /opt/yanqi/servers/kafka_2.12/bin/
[root@hadoop01 bin]# ./kafka-server-start.sh -daemon ../config/server.properties

~~~     # 创建主题
[root@hadoop01 bin]#  kafka-topics.sh --zookeeper hadoop02:2181/myKafka --create --topic lucasone --partitions 1 --replication-factor 1

~~~     # 启动生产者
[root@hadoop01 bin]# kafka-console-producer.sh --broker-list hadoop02:9092 --topic lucasone
~~~ 生产者生产数据
>stream自定义数据源  
>stream自定义数据源
>stream自定义数据源

### --- 编译打印

~~~     # 程序下注销这2行
        //FsStateBackend fsStateBackend = new FsStateBackend(new Path("hdfs:hadoop01:9000/flink/checkpoints"));
        //env.setStateBackend(fsStateBackend);

~~~     # 编译打印

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com.yanqi.streamdatasource.SourceFromKafka
~~~接收数据并做出相应的处理
stream自定义数据源
3> (1,0)
stream自定义数据源
stream自定义数据源
3> (2,0)
3> (3,0)

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Walter Savage Landor:strove with none,for none was worth my strife.Nature I loved and, next to Nature, Art:I warm'd both hands before the fire of life.It sinks, and I am ready to depart

                                                                                                                                                   ——W.S.Landor

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