無論是在spark streaming消費kafka，或是監控kafka的數據時，我們經常會需要知道offset最新情況

kafka數據的topic基於分區，並且通過每個partition的主分區可以獲取offset的最新情況

GetOffsetShellWrap

//這是對kafka自帶工具包的擴展
object GetOffsetShellWrap {

  //在主函數添加一個參數map
  def main(args: Array[String],map: ArrayBuffer[String]): Unit = {
    //對參數的解析
    val parser = new OptionParser
    val brokerListOpt 
 
= parser.accepts("broker-list", "REQUIRED: The list of hostname and port of the server to connect to.")
      .withRequiredArg
      .describedAs("hostname:port,...,hostname:port")
      .ofType(classOf[String])
    val topicOpt = parser.accepts("topic", "REQUIRED: The topic to get offset from.")
      .withRequiredArg
      .describedAs(
 
"topic")
      .ofType(classOf[String])
    val partitionOpt = parser.accepts("partitions", "comma separated list of partition ids. If not specified, it will find offsets for all partitions")
      .withRequiredArg
      .describedAs("partition ids")
      .ofType(classOf[String])
      .defaultsTo(
 
"")
    val timeOpt = parser.accepts("time", "timestamp of the offsets before that")
      .withRequiredArg
      .describedAs("timestamp/-1(latest)/-2(earliest)")
      .ofType(classOf[java.lang.Long])
    val nOffsetsOpt = parser.accepts("offsets", "number of offsets returned")
      .withRequiredArg
      .describedAs("count")
      .ofType(classOf[java.lang.Integer])
      .defaultsTo(1)
    val maxWaitMsOpt = parser.accepts("max-wait-ms", "The max amount of time each fetch request waits.")
      .withRequiredArg
      .describedAs("ms")
      .ofType(classOf[java.lang.Integer])
      .defaultsTo(1000)

    if(args.length == 0)
      CommandLineUtils.printUsageAndDie(parser, "An interactive shell for getting consumer offsets.")

    val options = parser.parse(args : _*)

    CommandLineUtils.checkRequiredArgs(parser, options, brokerListOpt, topicOpt, timeOpt)

　　//獲取參數的值
    val clientId = "GetOffsetShell"
    val brokerList = options.valueOf(brokerListOpt)
    ToolsUtils.validatePortOrDie(parser, brokerList)
    val metadataTargetBrokers = ClientUtils.parseBrokerList(brokerList)
    val topic = options.valueOf(topicOpt)
    var partitionList = options.valueOf(partitionOpt)
    var time = options.valueOf(timeOpt).longValue
    val nOffsets = options.valueOf(nOffsetsOpt).intValue
    val maxWaitMs = options.valueOf(maxWaitMsOpt).intValue()

    val topicsMetadata = ClientUtils.fetchTopicMetadata(Set(topic), metadataTargetBrokers, clientId, maxWaitMs).topicsMetadata
    if(topicsMetadata.size != 1 || !topicsMetadata(0).topic.equals(topic)) {
      System.err.println(("Error: no valid topic metadata for topic: %s, " + " probably the topic does not exist, run ").format(topic) +
        "kafka-list-topic.sh to verify")
      System.exit(1)
    }
    val partitions =
      if(partitionList == "") {
        topicsMetadata.head.partitionsMetadata.map(_.partitionId)
      } else {
        partitionList.split(",").map(_.toInt).toSeq
      }
    //遍歷每個主分區
    partitions.foreach { partitionId =>
      val partitionMetadataOpt = topicsMetadata.head.partitionsMetadata.find(_.partitionId == partitionId)
      partitionMetadataOpt match {
        case Some(metadata) =>
          metadata.leader match {
            case Some(leader) =>
              val consumer = new SimpleConsumer(leader.host, leader.port, 10000, 100000, clientId)
              val topicAndPartition = TopicAndPartition(topic, partitionId)
              val request = OffsetRequest(Map(topicAndPartition -> PartitionOffsetRequestInfo(time, nOffsets)))
              val offsets = consumer.getOffsetsBefore(request).partitionErrorAndOffsets(topicAndPartition).offsets
//把獲取到的offset進行存儲
              map += "%s:%d:%s".format(topic, partitionId, offsets.mkString(","))
            case None => System.err.println("Error: partition %d does not have a leader. Skip getting offsets".format(partitionId))
          }
        case None => System.err.println("Error: partition %d does not exist".format(partitionId))
      }
    }
  }
}

GetOffsetShellWrapScalaTest

object GetOffsetShellWrapScalaTest {
  def main(args: Array[String]) {
    var arr = ArrayBuffer[String]();
    arr+="--broker-list=hadoop-01:9092"
    arr+="-topic=2017-11-6-test"
    arr+="--time=-1"
    val resule = getOffset(arr.toArray)
    for(i<-resule){
      println("我自己獲取到的偏移量=> "+i)
    }
  }
  def getOffset(args: Array[String]) : Array[String]={
    val map = new ArrayBuffer[String]()
    GetOffsetShellWrap.main(args.toArray,map)
    map.toArray
  }
}

結果輸出：

2017-11-6-test:2:16099
2017-11-6-test:1:15930
2017-11-6-test:0:16096

獲取kafka最新offset-scala