Flink数据写入Hbase与Kafka

心已赠人 2022-11-10 10:39 397阅读 0赞

# Flink数据写入Hbase与Kafka #

## Sink到Hbase ##

导入Phoenix相关依赖

<dependency>
        <groupId>org.apache.phoenix</groupId>
        <artifactId>phoenix-core</artifactId>
        <version>5.0.0-HBase-2.0</version>
    </dependency>
    <dependency>
        <groupId>com.google.guava</groupId>
        <artifactId>guava</artifactId>
        <version>30.1-jre</version>
    </dependency>
    <dependency>
        <groupId>com.google.protobuf</groupId>
        <artifactId>protobuf-java</artifactId>
        <version>2.5.0</version>
    </dependency>

具体实现代码  
/\*\*

*  维度表数据写入到Hbase  
    \*/

private void sink2HBase(DataStream<Tuple2<JSONObject, TableProcess>> sink2HBaseStream) { 
    
            String phoenixUrl = "jdbc:phoenix:hadoop162,hadoop163,hadoop164:2181";
    
            sink2HBaseStream
                    .keyBy(t -> t.f1.getSinkTable())
                    .addSink(new RichSinkFunction<Tuple2<JSONObject, TableProcess>>() { 
                        //表示是否已经创建表的状态
                        private ValueState<Boolean> createTableState;
                        private Connection conn;
    
                        @Override
                        public void open(Configuration parameters) throws Exception { 
                           //建立到phoenix的连接
                            conn = DriverManager.getConnection(phoenixUrl);
    
                            //是否第一条数据，用于创建
                            createTableState = getRuntimeContext().getState(
                                    new ValueStateDescriptor<Boolean>("createTableState", Boolean.class)
                            );
                        }
    
                        @Override
                        public void invoke(Tuple2<JSONObject, TableProcess> value,
                                           Context context) throws Exception { 
                            //1. 检查表是否存在，如果不存在就创建表
                            checkTable(value);                       
                            //2. 把数据写入到hbase
                            write2HBase(value);
                        }
    
                        // 1. 检查表是否存在，如果不存在就创建表
                        private void checkTable(Tuple2<JSONObject, TableProcess> value) throws IOException, SQLException { 
                            // 执行建表语句
                            // create table if not exists user(
                            // id varchar,
                            // name varchar,
                            // constraint primary key(id) ) SALT_BUCKETS = 3
                            if (createTableState.value() == null){ 
                                System.out.println("value");
                                TableProcess tp = value.f1;
    
                                StringBuilder createSql = new StringBuilder();
                                createSql
                                        .append("create table if not exists ")
                                        .append(tp.getSinkTable())
                                        .append("(");
                                for (String s : tp.getSinkColumns().split(",")) { 
                                    createSql.append(s).append(" varchar,");
                                }
                                //拼接主键
                                createSql
                                        .append("constraint pk primary key(")
                                        .append(tp.getSinkPk()==null?"id":tp.getSinkPk())
                                        .append(")");
                                createSql.append(")");
                                createSql.append(tp.getSinkExtend()==null?"":tp.getSinkExtend());
    
                                //System.out.println(createSql);
                                PreparedStatement ps = conn.prepareStatement(createSql.toString());
                                ps.execute();
                                conn.commit();
    
                                if (ps != null) { 
                                    ps.close();
                                }
                                createTableState.update(true);
                            }
                        }
    
                        // 2.把数据写入到hbase
                        private void write2HBase(Tuple2<JSONObject, TableProcess> value) throws SQLException { 
                            // upsert into user(id, name)values(?, ?)
                            JSONObject data = value.f0;
                            TableProcess tp = value.f1;
    
                            StringBuilder sql = new StringBuilder();
    
                            sql
                                    .append("upsert into ")
                                    .append(tp.getSinkTable())
                                    .append("(")
                                    .append(tp.getSinkColumns())
                                    .append(")values(");
                            for (String c : tp.getSinkColumns().split(",")) { 
                                sql.append("'").append(data.getString(c)).append("',");
                            }
                            //删除多添加的一个逗号
                            sql.deleteCharAt(sql.length()-1);
    
                            sql.append(")");
                            System.out.println(sql);
    
                            PreparedStatement ps = conn.prepareStatement(sql.toString());
    
                            ps.execute();
                            conn.commit();
    
                            if (ps != null) { 
                                ps.close();
                            }
                        }
    
                       @Override
                        public void close() throws Exception { 
                            if (conn != null) { 
                                conn.close();
                            }
                        }
                    });
        }

## Sink到Kafka ##

更新MyKafkaUtil

添加新的获取KafkaSink的方法
    // 根据内容动态的写入不同的kafka Topic
    public static FlinkKafkaProducer<Tuple2<JSONObject, TableProcess>> getKafkaSink() { 
        Properties props = new Properties();
        props.setProperty("bootstrap.servers", "hadoop162:9092,hadoop163:9092,hadoop164:9092");
        //如果15分钟没有更新状态，则超时 默认1分钟
        props.setProperty("transaction.timeout.ms", 1000 * 60 * 15 + "");
        return new FlinkKafkaProducer<Tuple2<JSONObject, TableProcess>>(
            "default_topic",
            new KafkaSerializationSchema<Tuple2<JSONObject, TableProcess>>() { 
                @Override
                public ProducerRecord<byte[], byte[]> serialize(Tuple2<JSONObject, TableProcess> element, @Nullable Long timestamp) { 
                    final String topic = element.f1.getSinkTable();
                    final JSONObject data = element.f0.getJSONObject("data");
    
                    return new ProducerRecord<>(topic, data.toJSONString().getBytes());
                }
            },
            props,
            FlinkKafkaProducer.Semantic.EXACTLY_ONCE);
    }

具体实现代码

/** * 事实表数据写入到Kafka */
    private void sink2Kafka(SingleOutputStreamOperator<Tuple2<JSONObject, TableProcess>> sink2KafkaStream) { 
        sink2KafkaStream.addSink(MyKafkaUtil.getKafkaSink());
    }