Re: [问题]Flink并行计算中，不同的Window是如何接收到自己分区的数据的，即Window是如何确定当前Window属于哪个分区数?

Sun, 03 Mar 2019 05:26:37 -0800 

WordCount.scala
package 
com.opensourceteams.module.bigdata.flink.example.stream.worldcount.nc.parallelism

import org.apache.flink.configuration.Configuration
import org.apache.flink.streaming.api.scala.StreamExecutionEnvironment
import org.apache.flink.streaming.api.windowing.time.Time

/**
  * nc -lk 1234  输入数据
  */
object SocketWindowWordCountLocal {



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


    val port = 1234
    // get the execution environment
   // val env: StreamExecutionEnvironment = 
StreamExecutionEnvironment.getExecutionEnvironment


    val configuration : Configuration = getConfiguration(true)

    val env:StreamExecutionEnvironment = 
StreamExecutionEnvironment.createLocalEnvironment(1,configuration)





    // get input data by connecting to the socket
    val dataStream = env.socketTextStream("localhost", port, '\n')



    import org.apache.flink.streaming.api.scala._
    val textResult = dataStream.flatMap( w => w.split("\\s") ).map( w => 
WordWithCount(w,1))
      .keyBy("word")
      /**
        * 每20秒刷新一次，相当于重新开始计数，
        * 好处，不需要一直拿所有的数据统计
        * 只需要在指定时间间隔内的增量数据，减少了数据规模
        */
      .timeWindow(Time.seconds(5))
      //.countWindow(3)
      //.countWindow(3,1)
      //.countWindowAll(3)


      .sum("count" )

    textResult
      .setParallelism(100)
      .print()




    if(args == null || args.size ==0){


      
println("==================================以下为执行计划==================================")
      println("执行地址(firefox效果更好):https://flink.apache.org/visualizer";)
      //执行计划
      println(env.getExecutionPlan)
      println("==================================以上为执行计划 
JSON串==================================\n")
      //StreamGraph
     //println(env.getStreamGraph.getStreamingPlanAsJSON)



      //JsonPlanGenerator.generatePlan(jobGraph)

      env.execute("默认作业")

    }else{
      env.execute(args(0))
    }

    println("结束")

  }


  // Data type for words with count
  case class WordWithCount(word: String, count: Long)


  def getConfiguration(isDebug:Boolean = false):Configuration = {

    val configuration : Configuration = new Configuration()

    if(isDebug){
      val timeout = "100000 s"
      val timeoutHeartbeatPause = "1000000 s"
      configuration.setString("akka.ask.timeout",timeout)
      configuration.setString("akka.lookup.timeout",timeout)
      configuration.setString("akka.tcp.timeout",timeout)
      configuration.setString("akka.transport.heartbeat.interval",timeout)
      
configuration.setString("akka.transport.heartbeat.pause",timeoutHeartbeatPause)
      configuration.setString("akka.watch.heartbeat.pause",timeout)
      configuration.setInteger("heartbeat.interval",10000000)
      configuration.setInteger("heartbeat.timeout",50000000)
    }


    configuration
  }


}



> 在 2019年3月3日，下午9:05，刘 文 <[email protected]> 写道：
> 
> 
 [问题]Flink并行计算中，不同的Window是如何接收到自己分区的数据的，即Window是如何确定当前Window属于哪个分区数?
> 
> ).环境 Flink1.7.2 WordCount local,流处理
> ).source 中 RecordWriter.emit(),给每个元素按key,分到不同的partition,已确定每个元素的分区位置,分区个数由 
> DataStream.setParallelism(2)决定
>               
>               public void emit(T record) throws IOException, 
> InterruptedException {
>                  emit(record, channelSelector.selectChannels(record, 
> numChannels));
>       }
>       
>       通过copyFromSerializerToTargetChannel(int targetChannel) 
> 往不同的通道写数据，就是往不同的分区对应的window发送数据(数据是一条一条发送)
> ).有多少个并行度，DataStream.setParallelism(2)        ，就开启多少个Window
>

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