SparkStreaming 消費 Kafka 數據保存 Offset 到 Redis

Sparkstreaming程序:

package com.cloudera.savekafkaoffset

import com.cloudera.utils.{JedisPoolUtils, KafkaRedisUtils, RedisConfig}
import org.apache.kafka.clients.consumer.ConsumerConfig
import org.apache.kafka.common.serialization.StringDeserializer
import org.apache.log4j.Logger
import org.apache.spark.SparkConf
import org.apache.spark.streaming.kafka010.HasOffsetRanges
import org.apache.spark.streaming.{Seconds, StreamingContext}
import redis.clients.jedis.Pipeline

import scala.collection.immutable.Map

object SparkSaveOffsetToRedisApp {

  private val logger: Logger = Logger.getLogger(this.getClass)

  def main(args: Array[String]): Unit = {

    // Kafka 的 Offsets 以 module:groupId:topic 爲 key 的 hash 結構存入 Redis 中
    val module: String = "Test"

    val groupId: String = "groupId-01"

    val topics: Array[String] = "my-topic".split(",")

    // sparkstreaming 消費 kafka 時的 Consumer 參數
    val kafkaParams = Map[String, Object](
      ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG -> "192.168.1.100:9092,192.168.1.101:9092,192.168.1.102:9092",
      ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG -> classOf[StringDeserializer],
      ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG -> classOf[StringDeserializer],
      ConsumerConfig.GROUP_ID_CONFIG -> groupId,
      ConsumerConfig.AUTO_OFFSET_RESET_CONFIG -> "earliest",
      ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG -> (false: java.lang.Boolean)
    )

    // 初始化 Redis 連接池
    JedisPoolUtils.makePool(RedisConfig("192.168.1.100", 6379, 30000, 1000, 100, 50))

    val conf = new SparkConf().setIfMissing("spark.master", "local[2]").setAppName("Spark Save Offset To Zookeeper App")

    val streamingContext = new StreamingContext(conf, Seconds(30))
    val kafkaStream = KafkaRedisUtils.createDirectStream(streamingContext, kafkaParams, module, groupId, topics)

    //開始處理批次消息
    kafkaStream.foreachRDD(rdd => {
      //獲取當前批次的RDD的偏移量
      val offsetRanges = rdd.asInstanceOf[HasOffsetRanges].offsetRanges

      // 處理從獲取 kafka 中的數據
      if (!rdd.isEmpty()) {
        // 獲取 redis 連接
        val jedisClient = JedisPoolUtils.getPool.getResource
        //開啓事務
        val pipeline: Pipeline = jedisClient.pipelined()
        pipeline.multi()

        try {
          // 處理從獲取 kafka 中的數據
          val result = rdd.map(_.value()).map(_.split("\\|\\|")).map(x => (x(0), x(1), x(2)))
          logger.info("==========> Total " + rdd.count() + " events in this    batch ..")

          result.foreach(println(_))

          //更新offset到Redis中
          offsetRanges.foreach({ offsetRange =>
            logger.info("==========> partition : " + offsetRange.partition + " fromOffset:  " + offsetRange.fromOffset
              + " untilOffset: " + offsetRange.untilOffset)

            // Kafka 的 Offsets 以 module:groupId:topic 爲 key 的 hash 結構存入 Redis 中
            val key = s"${module}:${groupId}:${offsetRange.topic}"
            pipeline.hset(key, offsetRange.partition.toString, offsetRange.untilOffset.toString)
          })
          //提交事務
          pipeline.exec()
          //關閉pipeline
          pipeline.sync()
        } catch {
          case e: Exception => {
            logger.error("數據處理異常", e)
            pipeline.discard()
          }
        } finally {
          //關閉連接
          pipeline.close()
          jedisClient.close()
        }
      }
    })
    streamingContext.start()
    streamingContext.awaitTermination()
    streamingContext.stop()
  }
}

JedisPoolUtils 工具類

package com.cloudera.utils

import redis.clients.jedis.{JedisPool, JedisPoolConfig}

case class RedisConfig(redisHost: String, redisPort: Int, redisTimeout: Int, maxTotal: Int, maxIdle: Int, minIdle: Int) extends  Serializable

object JedisPoolUtils extends Serializable {

  @transient private var pool: JedisPool = null

  def makePool(redisConfig:RedisConfig): Unit ={
    makePool(redisConfig.redisHost, redisConfig.redisPort, redisConfig.redisTimeout, redisConfig.maxTotal, redisConfig.maxIdle, redisConfig.minIdle)
  }

  def makePool(redisHost: String, redisPort: Int, redisTimeout: Int, maxTotal: Int, maxIdle: Int, minIdle: Int): Unit = {
    makePool(redisHost, redisPort, redisTimeout, maxTotal, maxIdle, minIdle, true, false, 10000)
  }

  def makePool(redisHost: String, redisPort: Int, redisTimeout: Int, maxTotal: Int, maxIdle: Int, minIdle: Int, testOnBorrow: Boolean, testOnReturn: Boolean, maxWaitMillis: Long): Unit = {
    if (pool == null) {
      val poolConfig = new JedisPoolConfig()
      poolConfig.setMaxTotal(maxTotal)
      poolConfig.setMaxIdle(maxIdle)
      poolConfig.setMinIdle(minIdle)
      poolConfig.setTestOnBorrow(testOnBorrow)
      poolConfig.setTestOnReturn(testOnReturn)
      poolConfig.setMaxWaitMillis(maxWaitMillis)
      pool = new JedisPool(poolConfig, redisHost, redisPort, redisTimeout)

      val hook = new Thread {
        override def run = pool.destroy()
      }
      sys.addShutdownHook(hook.run)
    }
  }

  def getPool: JedisPool = {
    assert(pool != null)
    pool
  }
}

KafkaRedisUtils工具類:

package com.cloudera.utils

import java.util

import org.apache.kafka.clients.consumer.ConsumerRecord
import org.apache.kafka.common.TopicPartition
import org.apache.log4j.Logger
import org.apache.spark.streaming.StreamingContext
import org.apache.spark.streaming.dstream.InputDStream
import org.apache.spark.streaming.kafka010.LocationStrategies.PreferConsistent
import org.apache.spark.streaming.kafka010.{ConsumerStrategies, KafkaUtils}

import scala.collection.JavaConversions._
import scala.collection.immutable.Map

object KafkaRedisUtils {
  private val logger: Logger = Logger.getLogger(this.getClass)

  /**
    * 創建 DirectStream
    * @param streamingContext
    * @param kafkaParams   kafka參數
    * @param module    模塊名
    * @param groupId   消費者組
    * @param topics    topics
    * @return
    */
  def createDirectStream(streamingContext: StreamingContext, kafkaParams: Map[String, Object],
                         module: String, groupId: String,topics: Array[String]): InputDStream[ConsumerRecord[String, String]] = {

    //讀取 topic 的 offset
    val storedOffsets = readOffsets(module, groupId, kafkaParams, topics)

    val kafkaStream: InputDStream[ConsumerRecord[String, String]] = storedOffsets match {
      //上次未保存offsets
      case None => {
        KafkaUtils.createDirectStream[String, String](
          streamingContext,
          PreferConsistent,
          ConsumerStrategies.Subscribe[String, String](topics, kafkaParams)
        )
      }
      case Some(fromOffsets) => {
        KafkaUtils.createDirectStream[String, String](
          streamingContext,
          PreferConsistent,         
          // 指定分區消費，無法動態感知分區變化
//          ConsumerStrategies.Assign[String, String](fromOffsets.keys.toList, kafkaParams, fromOffsets)
          ConsumerStrategies.Subscribe[String, String](topics, kafkaParams, fromOffsets)
        )
      }
    }
    kafkaStream
  }


  /**
    * 讀取 offset
    * @param module
    * @param groupId
    * @param kafkaParams
    * @param topics
    * @return
    */
  def readOffsets(module: String, groupId: String,kafkaParams: Map[String, Object], topics: Array[String]): Option[Map[TopicPartition, Long]] = {
    logger.info("Reading offsets from Redis")
    val jedis = JedisPoolUtils.getPool.getResource

    //設置每個分區起始的Offset
    var fromOffSets: Map[TopicPartition, Long] = Map()
    try {
      topics.foreach(topic => {
        var topicFromOffsets: Map[TopicPartition, Long] = Map()
        val key = s"${module}:${groupId}:${topic}"
        if (jedis.exists(key)) {
          val offsetMap: util.Map[String, String] = jedis.hgetAll(key)
          offsetMap.map(record => {
            //判斷field(即分區)是否存在
            if(jedis.hexists(key,record._1)){
              logger.info(s"topic ${topic} partition ${record._1} get lastSavedOffset from redis: ${record._2}")
              topicFromOffsets += new TopicPartition(topic, record._1.toInt) -> record._2.toLong
            }else{
              jedis.hset(key,record._1,"0")
            }
          })
        }
        fromOffSets ++= topicFromOffsets
      })
    } catch {
      case e: Exception => logger.error("readOffsets error ", e)
        System.exit(1)
    }finally {
      jedis.close()
    }
    if (fromOffSets.isEmpty) {
      None
    } else {
      Some(fromOffSets)
    }
  }
}