1. 案例

用户ID,活动ID,时间,事件类型,省份

u001,A1,2019-09-02 10:10:11,1,北京市

u001,A1,2019-09-02 14:10:11,1,北京市

u001,A1,2019-09-02 14:10:11,2,北京市

u002,A1,2019-09-02 14:10:11,1,北京市

u002,A2,2019-09-02 14:10:11,1,北京市

u002,A2,2019-09-02 15:10:11,1,北京市

u002,A2,2019-09-02 15:10:11,2,北京市

事件类型：

  0：曝光

  1：点击

  2：参与

需求：统计点击、参与某个活动的人数和次数
  • 方案一：使用ValueState结合HashSet实现

　具体代码如下

ActivityCountAdv1

package cn._51doit.flink.day08;

import org.apache.flink.api.common.functions.MapFunction;

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.tuple.Tuple;

import org.apache.flink.api.java.tuple.Tuple4;

import org.apache.flink.api.java.tuple.Tuple5;

import org.apache.flink.configuration.Configuration;

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.LocalStreamEnvironment;

import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;

import org.apache.flink.streaming.api.functions.KeyedProcessFunction;

import org.apache.flink.util.Collector;

import java.util.HashSet;

public class ActivityCountAdv1 {

    public static void main(String[] args) throws Exception {

        LocalStreamEnvironment env = StreamExecutionEnvironment.createLocalEnvironment();

        DataStreamSource<String> lines = env.socketTextStream("feng05", 8888);

        // 对数据进行切分整理

        SingleOutputStreamOperator<Tuple5<String, String, String, Integer, String>> tpDataStream = lines.map(new MapFunction<String, Tuple5<String, String, String, Integer, String>>() {

            @Override

            public Tuple5<String, String, String, Integer, String> map(String line) throws Exception {

                String[] fields = line.split(",");

                String uid = fields[0];

                String activityID = fields[1];

                String date = fields[2];

                Integer type = Integer.parseInt(fields[3]);

                String prince = fields[4];

                return Tuple5.of(uid, activityID, date, type, prince);

            }

        });

        // 按照活动ID和事件类型分组

        KeyedStream<Tuple5<String, String, String, Integer, String>, Tuple> keyed = tpDataStream.keyBy(1, 3);

        keyed.process(new KeyedProcessFunction<Tuple, Tuple5<String, String, String, Integer, String>, Tuple4<String, Integer, Integer, Integer>>() {

            //保存去重后用户ID的HashSet

            private transient ValueState<HashSet<String>> uidState;

            //保存次数的Integer类型

            private transient ValueState<Integer> countState;

            @Override

            public void open(Configuration parameters) throws Exception {

                // 定义一个状态描述器

                ValueStateDescriptor<HashSet<String>> stateDescriptor1 = new ValueStateDescriptor<HashSet<String>>(

                        "uid-state",

                        TypeInformation.of(new TypeHint<HashSet<String>>(){})

                );

                // 定义一个状态描述器

                ValueStateDescriptor<Integer> stateDescriptor2 = new ValueStateDescriptor<Integer>(

                        "count-state",

                        Integer.class

                );

                // 获取状态

                uidState = getRuntimeContext().getState(stateDescriptor1);

                countState = getRuntimeContext().getState(stateDescriptor2);

            }

            @Override

            public void processElement(Tuple5<String, String, String, Integer, String> value, Context ctx, Collector<Tuple4<String, Integer, Integer, Integer>> out) throws Exception {

                String uid = value.f0;

                String aid = value.f1;

                Integer type = value.f3;

                //使用HashSet进行判断去重,更新uidState

                HashSet<String> hashSet = uidState.value();

                if(hashSet == null){

                    hashSet = new HashSet<>();

                }

                hashSet.add(uid);

                uidState.update(hashSet);

                // 计算人数

                Integer count = countState.value();

                if(count == null) {

                    count = 0;

                }

                count += 1;

                countState.update(count);

                out.collect(Tuple4.of(aid,type,hashSet.size(), count));

            }

        }).print();

        env.execute();

    }

}

　　如果使用HashSet去重，用户实例较大，会大量消耗资源，导致性能变低，甚至内存溢出

  • 方案二：改进，使用BloomFilter存储用户的ID，BloomFilter可以判断用户一定不存在，使用的内存极少。但是使用BloomFilter没有计数器，就必须额外定义一个状态，存储去重的人数

ActivityCountAdv2

package cn._51doit.flink.day08;

import org.apache.flink.api.common.functions.MapFunction;

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.tuple.Tuple;

import org.apache.flink.api.java.tuple.Tuple4;

import org.apache.flink.api.java.tuple.Tuple5;

import org.apache.flink.configuration.Configuration;

import org.apache.flink.shaded.guava18.com.google.common.hash.BloomFilter;

import org.apache.flink.shaded.guava18.com.google.common.hash.Funnels;

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.StreamExecutionEnvironment;

import org.apache.flink.streaming.api.functions.KeyedProcessFunction;

import org.apache.flink.util.Collector;

import java.nio.charset.Charset;

import java.nio.charset.StandardCharsets;

import java.util.HashSet;

public class ActivityCountAdv2 {

    public static void main(String[] args) throws Exception {

        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

        //u001,A1,2019-09-02 10:10:11,1,北京市

        DataStreamSource<String> lines = env.socketTextStream("localhost", 8888);

        //对数据进行切分整理

        SingleOutputStreamOperator<Tuple5<String, String, String, String, String>> tpDataStream = lines.map(new MapFunction<String, Tuple5<String, String, String, String, String>>() {

            @Override

            public Tuple5<String, String, String, String, String> map(String line) throws Exception {

                String[] fields = line.split(",");

                String uid = fields[0];

                String aid = fields[1];

                String time = fields[2];

                String type = fields[3];

                String province = fields[4];

                return Tuple5.of(uid, aid, time, type, province);

            }

        });

        //按照活动ID和事件类型分组

        KeyedStream<Tuple5<String, String, String, String, String>, Tuple> keyed = tpDataStream.keyBy(1, 3);

        keyed.process(new KeyedProcessFunction<Tuple, Tuple5<String, String, String, String, String>, Tuple4<String, String, Integer, Integer>>() {

            //保存去重后用户ID的HashSet

            private transient ValueState<BloomFilter> uidState;

            //保存用户ID去重的次数的Integer类型

            private transient ValueState<Integer> uidCountState;

            //保存次数的Integer类型（未去重的）

            private transient ValueState<Integer> countState;

            @Override

            public void open(Configuration parameters) throws Exception {

                //定义一个状态描述器

                ValueStateDescriptor<BloomFilter> stateDescriptor1 = new ValueStateDescriptor<BloomFilter>(

                        "uid-state",

                        TypeInformation.of(new TypeHint<BloomFilter>(){})

                );

                //定义一个状态描述器

                ValueStateDescriptor<Integer> stateDescriptor2 = new ValueStateDescriptor<Integer>(

                        "count-state",

                        Integer.class

                );

                //定义一个状态描述器

                ValueStateDescriptor<Integer> stateDescriptor3 = new ValueStateDescriptor<Integer>(

                        "uid-count-state",

                        Integer.class

                );

                //获取状态

                //获取状态

                uidState = getRuntimeContext().getState(stateDescriptor1);

                countState = getRuntimeContext().getState(stateDescriptor2);

                uidCountState = getRuntimeContext().getState(stateDescriptor3);

            }

            @Override

            public void processElement(Tuple5<String, String, String, String, String> value, Context ctx, Collector<Tuple4<String, String, Integer, Integer>> out) throws Exception {

                String uid = value.f0;

                String aid = value.f1;

                String type = value.f3;

                //使用HashSet进行判断去重

                BloomFilter bloomFilter = uidState.value();

                Integer uidCount = uidCountState.value(); //人数

                Integer count = countState.value(); //次数

                if(count == null) {

                    count = 0;

                }

                if(bloomFilter == null) {

                    bloomFilter = BloomFilter.create(Funnels.unencodedCharsFunnel(), 10000000);

                    uidCount = 0;

                }

                if(!bloomFilter.mightContain(uid)) {

                    bloomFilter.put(uid); //添加到BloomFilter中

                    uidCount += 1;

                }

                count += 1;

                countState.update(count);

                uidState.update(bloomFilter);

                uidCountState.update(uidCount);

                out.collect(Tuple4.of(aid, type, uidCount, count));

            }

        }).print();

        env.execute();

    }

}

 2. 活动指标多维度统计

　　此处要进行多次key操作（一中维度就需要keyBy一次），相当繁琐。此处是通过将数据存入redis，所以不需要使用flink中的state，具体见代码

ActivityCountWithMultiDimension

package cn._51doit.flink.day08;

import org.apache.flink.api.common.functions.MapFunction;

import org.apache.flink.api.java.tuple.Tuple3;

import org.apache.flink.api.java.utils.ParameterTool;

import org.apache.flink.streaming.api.datastream.DataStreamSource;

import org.apache.flink.streaming.api.datastream.SingleOutputStreamOperator;

import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;

import sun.awt.geom.AreaOp;

public class ActivityCountWithMultiDimension {

    public static void main(String[] args) throws Exception{

        ParameterTool parameters = ParameterTool.fromPropertiesFile(args[0]);

        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

        env.getConfig().setGlobalJobParameters(parameters);

        //u001,A1,2019-09-02 10:10:11,1,北京市

        DataStreamSource<String> lines = env.socketTextStream("localhost", 8888);

        SingleOutputStreamOperator<ActivityBean> beanStream = lines.map(new MapFunction<String, ActivityBean>() {

            @Override

            public ActivityBean map(String line) throws Exception {

                String[] fields = line.split(",");

                String uid = fields[0];

                String aid = fields[1];

                String date = fields[2].split(" ")[0];

                String type = fields[3];

                String province = fields[4];

                return ActivityBean.of(uid, aid, date, type, province);

            }

        });

        SingleOutputStreamOperator<ActivityBean> res1 = beanStream.keyBy("aid", "type").sum("count");

        SingleOutputStreamOperator<ActivityBean> res2 = beanStream.keyBy("aid", "type", "date").sum("count");

        SingleOutputStreamOperator<ActivityBean> res3 = beanStream.keyBy("aid", "type", "date", "province").sum("count");

        res1.map(new MapFunction<ActivityBean, Tuple3<String, String, String>>() {

            @Override

            public Tuple3<String, String, String> map(ActivityBean value) throws Exception {

                return Tuple3.of(Constant.ACTIVITY_COUNT +"-"+ value.aid,  value.type, value.count.toString());

            }

        }).addSink(new MyRedisSink());

        res2.map(new MapFunction<ActivityBean, Tuple3<String, String, String>>() {

            @Override

            public Tuple3<String, String, String> map(ActivityBean value) throws Exception {

                return Tuple3.of(Constant.DAILY_ACTIVITY_COUNT + "-" + value.aid + "-" + value.date, value.type, value.count.toString());

            }

        }).addSink(new MyRedisSink());

        res3.map(new MapFunction<ActivityBean, Tuple3<String, String, String>>() {

            @Override

            public Tuple3<String, String, String> map(ActivityBean value) throws Exception {

                return Tuple3.of(Constant.PROVINCE_DAILY_ACTIVITY_COUNT + "-" + value.aid + "-" + value.date + "-" + value.province, value.type, value.count.toString());

            }

        }).addSink(new MyRedisSink());

        env.execute();

    }

}

Constant

package cn._51doit.flink.day08;

public class Constant {

    public static final String ACTIVITY_COUNT = "ACTIVITY_COUNT";

    public static final String DAILY_ACTIVITY_COUNT = "DAILY_ACTIVITY_COUNT";

    public static final String PROVINCE_DAILY_ACTIVITY_COUNT = "PROVINCE_DAILY_ACTIVITY_COUNT";

}

ActivityBean

package cn._51doit.flink.day08;

public class ActivityBean {

    public String uid;

    public String aid;

    public String date;

    public String type;

    public String province;

    public Long count = 1L;

    public ActivityBean() {}

    public ActivityBean(String uid, String aid, String date, String type, String province) {

        this.uid = uid;

        this.aid = aid;

        this.date = date;

        this.type = type;

        this.province = province;

    }

    public static ActivityBean of(String uid, String aid, String date, String type, String province) {

        return new ActivityBean(uid, aid, date, type, province);

    }

    @Override

    public String toString() {

        return "ActivityBean{" +

                "uid='" + uid + '\'' +

                ", aid='" + aid + '\'' +

                ", date='" + date + '\'' +

                ", type='" + type + '\'' +

                ", province='" + province + '\'' +

                '}';

    }

}

MyRedisSink

package cn._51doit.flink.day08;

import org.apache.flink.api.java.tuple.Tuple3;

import org.apache.flink.api.java.utils.ParameterTool;

import org.apache.flink.configuration.Configuration;

import org.apache.flink.streaming.api.functions.sink.RichSinkFunction;

import redis.clients.jedis.Jedis;

public class MyRedisSink extends RichSinkFunction<Tuple3<String, String, String>> {

    private transient Jedis jedis;

    @Override

    public void open(Configuration parameters) throws Exception {

       ParameterTool params = (ParameterTool) getRuntimeContext()

               .getExecutionConfig()

               .getGlobalJobParameters();

        String host = params.getRequired("redis.host");

        String password = params.getRequired("redis.password");

        int port = params.getInt("redis.port", 6379);

        int db = params.getInt("redis.db", 0);

        Jedis jedis = new Jedis(host, port);

        jedis.auth(password);

        jedis.select(db);

        this.jedis = jedis;

    }

    @Override

    public void invoke(Tuple3<String, String, String> value, Context context) throws Exception {

        if (!jedis.isConnected()) {

            jedis.connect();

        }

        jedis.hset(value.f0, value.f1, value.f2);

    }

    @Override

    public void close() throws Exception {

        jedis.close();

    }

}

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