LAB1 partIII

partIII

实现分发MapReduce 任务，实现 schedule() 方法在 mapreduce/schedule.go。

schedule()函数的职责是把任务分给可用的worker.

schedule()通过信道registerChan参数读取注册的worker.

worker与schedule()之间的顺序是没有确定的。

schedule()告诉worker 执行远程函数调用Worker.DoTask.

远程调用的参数 DoTaskArgs定义在 mapreduce/common_rpc.go

File 参数只有 mapTask 才用到.

rpc 使用call() function 定义在 mapreduce/common_rpc.go

测试命令

go test -run TestParallel

会执行两边，TestParallelBasic and TestParallelCheck;

master@master:~/study/6.824/src/mapreduce$ go test -run TestParallel

2019/03/22 14:34:40 rpc.Register: method "CleanupFiles" has 1 input parameters; needs exactly three

2019/03/22 14:34:40 rpc.Register: method "Lock" has 1 input parameters; needs exactly three

2019/03/22 14:34:40 rpc.Register: method "Unlock" has 1 input parameters; needs exactly three

2019/03/22 14:34:40 rpc.Register: method "Wait" has 1 input parameters; needs exactly three

2019/03/22 14:34:40 rpc.Register: method "Lock" has 1 input parameters; needs exactly three

2019/03/22 14:34:40 rpc.Register: method "Unlock" has 1 input parameters; needs exactly three

/var/tmp/824-1000/mr20412-master: Starting Map/Reduce task test

2019/03/22 14:34:40 rpc.Register: method "Lock" has 1 input parameters; needs exactly three

2019/03/22 14:34:40 rpc.Register: method "Unlock" has 1 input parameters; needs exactly three

Schedule: 20 mapPhase tasks (10 I/Os)

/var/tmp/824-1000/mr20412-worker0: given mapPhase task #0 on file 824-mrinput-0.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker1: given mapPhase task #1 on file 824-mrinput-1.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker1: mapPhase task #1 done

/var/tmp/824-1000/mr20412-worker0: mapPhase task #0 done

/var/tmp/824-1000/mr20412-worker1: given mapPhase task #2 on file 824-mrinput-2.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker0: given mapPhase task #3 on file 824-mrinput-3.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker0: mapPhase task #3 done

/var/tmp/824-1000/mr20412-worker1: mapPhase task #2 done

/var/tmp/824-1000/mr20412-worker0: given mapPhase task #4 on file 824-mrinput-4.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker1: given mapPhase task #5 on file 824-mrinput-5.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker0: mapPhase task #4 done

/var/tmp/824-1000/mr20412-worker0: given mapPhase task #6 on file 824-mrinput-6.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker1: mapPhase task #5 done

/var/tmp/824-1000/mr20412-worker1: given mapPhase task #7 on file 824-mrinput-7.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker0: mapPhase task #6 done

/var/tmp/824-1000/mr20412-worker0: given mapPhase task #8 on file 824-mrinput-8.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker1: mapPhase task #7 done

/var/tmp/824-1000/mr20412-worker1: given mapPhase task #9 on file 824-mrinput-9.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker0: mapPhase task #8 done

/var/tmp/824-1000/mr20412-worker0: given mapPhase task #10 on file 824-mrinput-10.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker1: mapPhase task #9 done

/var/tmp/824-1000/mr20412-worker1: given mapPhase task #11 on file 824-mrinput-11.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker0: mapPhase task #10 done

/var/tmp/824-1000/mr20412-worker0: given mapPhase task #12 on file 824-mrinput-12.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker1: mapPhase task #11 done

/var/tmp/824-1000/mr20412-worker1: given mapPhase task #13 on file 824-mrinput-13.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker0: mapPhase task #12 done

/var/tmp/824-1000/mr20412-worker0: given mapPhase task #14 on file 824-mrinput-14.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker1: mapPhase task #13 done

/var/tmp/824-1000/mr20412-worker1: given mapPhase task #15 on file 824-mrinput-15.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker0: mapPhase task #14 done

/var/tmp/824-1000/mr20412-worker0: given mapPhase task #16 on file 824-mrinput-16.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker1: mapPhase task #15 done

/var/tmp/824-1000/mr20412-worker1: given mapPhase task #17 on file 824-mrinput-17.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker0: mapPhase task #16 done

/var/tmp/824-1000/mr20412-worker0: given mapPhase task #18 on file 824-mrinput-18.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker1: mapPhase task #17 done

/var/tmp/824-1000/mr20412-worker1: given mapPhase task #19 on file 824-mrinput-19.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker0: mapPhase task #18 done

/var/tmp/824-1000/mr20412-worker1: mapPhase task #19 done

Schedule: mapPhase done

Schedule: 10 reducePhase tasks (20 I/Os)

/var/tmp/824-1000/mr20412-worker1: given reducePhase task #1 on file (nios: 20)

/var/tmp/824-1000/mr20412-worker0: given reducePhase task #0 on file (nios: 20)

/var/tmp/824-1000/mr20412-worker1: reducePhase task #1 done

/var/tmp/824-1000/mr20412-worker1: given reducePhase task #2 on file (nios: 20)

/var/tmp/824-1000/mr20412-worker0: reducePhase task #0 done

/var/tmp/824-1000/mr20412-worker0: given reducePhase task #3 on file (nios: 20)

/var/tmp/824-1000/mr20412-worker1: reducePhase task #2 done

/var/tmp/824-1000/mr20412-worker1: given reducePhase task #4 on file (nios: 20)

/var/tmp/824-1000/mr20412-worker0: reducePhase task #3 done

/var/tmp/824-1000/mr20412-worker0: given reducePhase task #5 on file (nios: 20)

/var/tmp/824-1000/mr20412-worker1: reducePhase task #4 done

/var/tmp/824-1000/mr20412-worker1: given reducePhase task #6 on file (nios: 20)

/var/tmp/824-1000/mr20412-worker0: reducePhase task #5 done

/var/tmp/824-1000/mr20412-worker0: given reducePhase task #7 on file (nios: 20)

/var/tmp/824-1000/mr20412-worker1: reducePhase task #6 done

/var/tmp/824-1000/mr20412-worker1: given reducePhase task #8 on file (nios: 20)

/var/tmp/824-1000/mr20412-worker0: reducePhase task #7 done

/var/tmp/824-1000/mr20412-worker0: given reducePhase task #9 on file (nios: 20)

/var/tmp/824-1000/mr20412-worker1: reducePhase task #8 done

/var/tmp/824-1000/mr20412-worker0: reducePhase task #9 done

Schedule: reducePhase done

Merge: read mrtmp.test-res-0

Merge: read mrtmp.test-res-1

Merge: read mrtmp.test-res-2

Merge: read mrtmp.test-res-3

Merge: read mrtmp.test-res-4

Merge: read mrtmp.test-res-5

Merge: read mrtmp.test-res-6

Merge: read mrtmp.test-res-7

Merge: read mrtmp.test-res-8

Merge: read mrtmp.test-res-9

/var/tmp/824-1000/mr20412-master: Map/Reduce task completed

2019/03/22 14:34:41 rpc.Register: method "CleanupFiles" has 1 input parameters; needs exactly three

2019/03/22 14:34:41 rpc.Register: method "Lock" has 1 input parameters; needs exactly three

2019/03/22 14:34:41 rpc.Register: method "Unlock" has 1 input parameters; needs exactly three

2019/03/22 14:34:41 rpc.Register: method "Wait" has 1 input parameters; needs exactly three

2019/03/22 14:34:41 rpc.Register: method "Lock" has 1 input parameters; needs exactly three

2019/03/22 14:34:41 rpc.Register: method "Unlock" has 1 input parameters; needs exactly three

/var/tmp/824-1000/mr20412-master: Starting Map/Reduce task test

Schedule: 20 mapPhase tasks (10 I/Os)

2019/03/22 14:34:41 rpc.Register: method "Lock" has 1 input parameters; needs exactly three

2019/03/22 14:34:41 rpc.Register: method "Unlock" has 1 input parameters; needs exactly three

/var/tmp/824-1000/mr20412-worker1: given mapPhase task #0 on file 824-mrinput-0.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker0: given mapPhase task #1 on file 824-mrinput-1.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker0: mapPhase task #1 done

/var/tmp/824-1000/mr20412-worker0: given mapPhase task #2 on file 824-mrinput-2.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker0: mapPhase task #2 done

/var/tmp/824-1000/mr20412-worker0: given mapPhase task #3 on file 824-mrinput-3.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker0: mapPhase task #3 done

/var/tmp/824-1000/mr20412-worker0: given mapPhase task #4 on file 824-mrinput-4.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker0: mapPhase task #4 done

/var/tmp/824-1000/mr20412-worker0: given mapPhase task #5 on file 824-mrinput-5.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker0: mapPhase task #5 done

/var/tmp/824-1000/mr20412-worker0: given mapPhase task #6 on file 824-mrinput-6.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker0: mapPhase task #6 done

/var/tmp/824-1000/mr20412-worker0: given mapPhase task #7 on file 824-mrinput-7.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker0: mapPhase task #7 done

/var/tmp/824-1000/mr20412-worker0: given mapPhase task #8 on file 824-mrinput-8.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker0: mapPhase task #8 done

/var/tmp/824-1000/mr20412-worker0: given mapPhase task #9 on file 824-mrinput-9.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker0: mapPhase task #9 done

/var/tmp/824-1000/mr20412-worker0: given mapPhase task #10 on file 824-mrinput-10.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker0: mapPhase task #10 done

/var/tmp/824-1000/mr20412-worker0: given mapPhase task #11 on file 824-mrinput-11.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker0: mapPhase task #11 done

/var/tmp/824-1000/mr20412-worker0: given mapPhase task #12 on file 824-mrinput-12.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker0: mapPhase task #12 done

/var/tmp/824-1000/mr20412-worker0: given mapPhase task #13 on file 824-mrinput-13.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker0: mapPhase task #13 done

/var/tmp/824-1000/mr20412-worker0: given mapPhase task #14 on file 824-mrinput-14.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker0: mapPhase task #14 done

/var/tmp/824-1000/mr20412-worker0: given mapPhase task #15 on file 824-mrinput-15.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker0: mapPhase task #15 done

/var/tmp/824-1000/mr20412-worker0: given mapPhase task #16 on file 824-mrinput-16.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker0: mapPhase task #16 done

/var/tmp/824-1000/mr20412-worker0: given mapPhase task #17 on file 824-mrinput-17.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker0: mapPhase task #17 done

/var/tmp/824-1000/mr20412-worker0: given mapPhase task #18 on file 824-mrinput-18.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker0: mapPhase task #18 done

/var/tmp/824-1000/mr20412-worker0: given mapPhase task #19 on file 824-mrinput-19.txt (nios: 10)

/var/tmp/824-1000/mr20412-worker0: mapPhase task #19 done

/var/tmp/824-1000/mr20412-worker1: mapPhase task #0 done

Schedule: mapPhase done

Schedule: 10 reducePhase tasks (20 I/Os)

/var/tmp/824-1000/mr20412-worker1: given reducePhase task #1 on file (nios: 20)

/var/tmp/824-1000/mr20412-worker0: given reducePhase task #0 on file (nios: 20)

/var/tmp/824-1000/mr20412-worker0: reducePhase task #0 done

/var/tmp/824-1000/mr20412-worker1: reducePhase task #1 done

/var/tmp/824-1000/mr20412-worker0: given reducePhase task #2 on file (nios: 20)

/var/tmp/824-1000/mr20412-worker1: given reducePhase task #3 on file (nios: 20)

/var/tmp/824-1000/mr20412-worker0: reducePhase task #2 done

/var/tmp/824-1000/mr20412-worker0: given reducePhase task #4 on file (nios: 20)

/var/tmp/824-1000/mr20412-worker1: reducePhase task #3 done

/var/tmp/824-1000/mr20412-worker1: given reducePhase task #5 on file (nios: 20)

/var/tmp/824-1000/mr20412-worker0: reducePhase task #4 done

/var/tmp/824-1000/mr20412-worker0: given reducePhase task #6 on file (nios: 20)

/var/tmp/824-1000/mr20412-worker1: reducePhase task #5 done

/var/tmp/824-1000/mr20412-worker1: given reducePhase task #7 on file (nios: 20)

/var/tmp/824-1000/mr20412-worker0: reducePhase task #6 done

/var/tmp/824-1000/mr20412-worker0: given reducePhase task #8 on file (nios: 20)

/var/tmp/824-1000/mr20412-worker1: reducePhase task #7 done

/var/tmp/824-1000/mr20412-worker1: given reducePhase task #9 on file (nios: 20)

/var/tmp/824-1000/mr20412-worker0: reducePhase task #8 done

/var/tmp/824-1000/mr20412-worker1: reducePhase task #9 done

Schedule: reducePhase done

Merge: read mrtmp.test-res-0

Merge: read mrtmp.test-res-1

Merge: read mrtmp.test-res-2

Merge: read mrtmp.test-res-3

Merge: read mrtmp.test-res-4

Merge: read mrtmp.test-res-5

Merge: read mrtmp.test-res-6

Merge: read mrtmp.test-res-7

Merge: read mrtmp.test-res-8

Merge: read mrtmp.test-res-9

/var/tmp/824-1000/mr20412-master: Map/Reduce task completed

PASS

ok _/home/master/study/6.824/src/mapreduce 2.053s

schedule.go

package mapreduce

import (

   "fmt"

   "sync"

   "strings"

   "time"

)

//

// schedule() starts and waits for all tasks in the given phase (mapPhase

// or reducePhase). the mapFiles argument holds the names of the files that

// are the inputs to the map phase, one per map task. nReduce is the

// number of reduce tasks. the registerChan argument yields a stream

// of registered workers; each item is the worker's RPC address,

// suitable for passing to call(). registerChan will yield all

// existing registered workers (if any) and new ones as they register.

//

func schedule(jobName string, mapFiles []string, nReduce int, phase jobPhase, registerChan chan string) {

   var ntasks int

   var n_other int // number of inputs (for reduce) or outputs (for map)

   switch phase {

   case mapPhase:

      ntasks = len(mapFiles)

      n_other = nReduce

   case reducePhase:

      ntasks = nReduce

      n_other = len(mapFiles)

   }

   fmt.Printf("Schedule: %v %v tasks (%d I/Os)\n", ntasks, phase, n_other)

   // All ntasks tasks have to be scheduled on workers. Once all tasks

   // have completed successfully, schedule() should return.

   //

   // Your code here (Part III, Part IV).

   //

   usableWorkers := make(chan string)

   waitGroup := new(sync.WaitGroup)

   i :=

   for  {

      var work string;

      select {

         case work  =<- usableWorkers:

            //fmt.Printf("usable worker: %v \n", work)

         case work =<- registerChan:

            //fmt.Printf("usable worker: %v \n", work)

      //default:

         //fmt.Printf("not usable worker wait for next loop ...\n")

      }

      if  strings.TrimSpace(work) != "" {

         waitGroup.Add()

         go func(index int) {

            rqArs := new(DoTaskArgs)

            rqArs.JobName=jobName

            if  phase == mapPhase {

               rqArs.File  = mapFiles[index]    // only for map, the input file

            }

            rqArs.Phase=phase   // are we in mapPhase or reducePhase?

            rqArs.TaskNumber=index      // this task's index in the current phase

            // NumOtherPhase is the total number of tasks in other phase; mappers

            // need this to compute the number of output bins, and reducers needs

            // this to know how many input files to collect.

            rqArs.NumOtherPhase=n_other

                defer func(){

                   waitGroup.Done()

                   usableWorkers <- work

                   }()

            call(work, "Worker.DoTask",

               rqArs, nil)

         }(i)

         i++

      } else {

         time.After(time.Second)

      }

      if i == ntasks {

         break

      }

   }

   waitGroup.Wait()

   fmt.Printf("Schedule: %v done\n", phase)

}

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