flink读取kafka的数据处理完毕写入redis

/* 
 * 从Kafka读取数据处理完毕写入Redis
 */
public class KafkaToRedis {

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

        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        //开启checkpointing
        env.enableCheckpointing(1000);
        //设置StateBackEnd 存储在HDFS中
        env.setStateBackend(new FsStateBackend("hdfs://mydfs/checkpoint"));
        //设置cancel任务checkpoint数据的策略  cancel任务保留checkpoint的数据
        env.getCheckpointConfig().enableExternalizedCheckpoints(CheckpointConfig.ExternalizedCheckpointCleanup.RETAIN_ON_CANCELLATION);
        Properties properties = new Properties();
        //设置Broker地址
        properties.setProperty(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,"linux01:9092,linux02:9092,linux03:9092");
        //设置没有偏移量的话从头开始读取数据
        properties.setProperty(ConsumerConfig.AUTO_OFFSET_RESET_DOC,"earliest");
        //设置不自动提交偏移量
        properties.setProperty(ConsumerConfig.ENA