LAB1 partIV

PartIV

实现处理worker 失败情况。

worker 处理失败，master 应该重新分配该任务给其他的worker 处理。

rpc 失败情况复杂，可能worker 结果回应丢失了，也有可能 worker还在处理，但是

master rpc 超时了。考虑两个worker都拿到相同的task 且都有结果文件的情况，

要确保输出任务的原子性。当前这个程序框架无法保证任务输出的原子性,只考虑失败的worker没任何输出。

测试命令

$ go test -run Failure

master@master:~/study/6.824/src/mapreduce$

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

2019/03/24 08:59:25 rpc.Register: method "CleanupFiles" has 1 input parameters; needs exactly three

2019/03/24 08:59:25 rpc.Register: method "Lock" has 1 input parameters; needs exactly three

2019/03/24 08:59:25 rpc.Register: method "Unlock" has 1 input parameters; needs exactly three

2019/03/24 08:59:25 rpc.Register: method "Wait" has 1 input parameters; needs exactly three

2019/03/24 08:59:25 rpc.Register: method "Lock" has 1 input parameters; needs exactly three

2019/03/24 08:59:25 rpc.Register: method "Unlock" has 1 input parameters; needs exactly three

/var/tmp/824-1000/mr2499-master: Starting Map/Reduce task test

2019/03/24 08:59:25 rpc.Register: method "Lock" has 1 input parameters; needs exactly three

2019/03/24 08:59:25 rpc.Register: method "Unlock" has 1 input parameters; needs exactly three

Schedule: 20 mapPhase tasks (10 I/Os)

/var/tmp/824-1000/mr2499-worker1: given mapPhase task #0 on file 824-mrinput-0.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker0: given mapPhase task #1 on file 824-mrinput-1.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker0: mapPhase task #1 done

/var/tmp/824-1000/mr2499-worker1: mapPhase task #0 done

/var/tmp/824-1000/mr2499-worker1: given mapPhase task #3 on file 824-mrinput-3.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker0: given mapPhase task #2 on file 824-mrinput-2.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker0: mapPhase task #2 done

/var/tmp/824-1000/mr2499-worker0: given mapPhase task #4 on file 824-mrinput-4.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker1: mapPhase task #3 done

/var/tmp/824-1000/mr2499-worker1: given mapPhase task #5 on file 824-mrinput-5.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker1: mapPhase task #5 done

/var/tmp/824-1000/mr2499-worker1: given mapPhase task #6 on file 824-mrinput-6.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker0: mapPhase task #4 done

/var/tmp/824-1000/mr2499-worker0: given mapPhase task #7 on file 824-mrinput-7.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker1: mapPhase task #6 done

/var/tmp/824-1000/mr2499-worker1: given mapPhase task #8 on file 824-mrinput-8.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker0: mapPhase task #7 done

/var/tmp/824-1000/mr2499-worker0: given mapPhase task #9 on file 824-mrinput-9.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker0: mapPhase task #9 done

/var/tmp/824-1000/mr2499-worker0: given mapPhase task #10 on file 824-mrinput-10.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker1: mapPhase task #8 done

/var/tmp/824-1000/mr2499-worker1: given mapPhase task #11 on file 824-mrinput-11.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker0: mapPhase task #10 done

/var/tmp/824-1000/mr2499-worker0: given mapPhase task #12 on file 824-mrinput-12.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker1: mapPhase task #11 done

/var/tmp/824-1000/mr2499-worker1: given mapPhase task #13 on file 824-mrinput-13.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker0: mapPhase task #12 done

/var/tmp/824-1000/mr2499-worker0: given mapPhase task #14 on file 824-mrinput-14.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker1: mapPhase task #13 done

/var/tmp/824-1000/mr2499-worker1: given mapPhase task #15 on file 824-mrinput-15.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker0: mapPhase task #14 done

/var/tmp/824-1000/mr2499-worker0: given mapPhase task #16 on file 824-mrinput-16.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker1: mapPhase task #15 done

/var/tmp/824-1000/mr2499-worker1: given mapPhase task #17 on file 824-mrinput-17.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker0: mapPhase task #16 done

/var/tmp/824-1000/mr2499-worker0: given mapPhase task #18 on file 824-mrinput-18.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker1: mapPhase task #17 done

/var/tmp/824-1000/mr2499-worker1: given mapPhase task #19 on file 824-mrinput-19.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker0: mapPhase task #18 done

/var/tmp/824-1000/mr2499-worker1: mapPhase task #19 done

Schedule: mapPhase done

Schedule: 10 reducePhase tasks (20 I/Os)

/var/tmp/824-1000/mr2499-worker1: given reducePhase task #1 on file (nios: 20)

/var/tmp/824-1000/mr2499-worker1: reducePhase task #1 done

/var/tmp/824-1000/mr2499-worker1: given reducePhase task #2 on file (nios: 20)

/var/tmp/824-1000/mr2499-worker1: reducePhase task #2 done

/var/tmp/824-1000/mr2499-worker1: given reducePhase task #3 on file (nios: 20)

/var/tmp/824-1000/mr2499-worker1: reducePhase task #3 done

/var/tmp/824-1000/mr2499-worker1: given reducePhase task #4 on file (nios: 20)

/var/tmp/824-1000/mr2499-worker1: reducePhase task #4 done

/var/tmp/824-1000/mr2499-worker1: given reducePhase task #5 on file (nios: 20)

/var/tmp/824-1000/mr2499-worker1: reducePhase task #5 done

/var/tmp/824-1000/mr2499-worker1: given reducePhase task #6 on file (nios: 20)

/var/tmp/824-1000/mr2499-worker1: reducePhase task #6 done

/var/tmp/824-1000/mr2499-worker1: given reducePhase task #7 on file (nios: 20)

/var/tmp/824-1000/mr2499-worker1: reducePhase task #7 done

/var/tmp/824-1000/mr2499-worker1: given reducePhase task #8 on file (nios: 20)

/var/tmp/824-1000/mr2499-worker1: reducePhase task #8 done

/var/tmp/824-1000/mr2499-worker1: given reducePhase task #9 on file (nios: 20)

/var/tmp/824-1000/mr2499-worker1: reducePhase task #9 done

/var/tmp/824-1000/mr2499-worker1: given reducePhase task #0 on file (nios: 20)

/var/tmp/824-1000/mr2499-worker1: reducePhase task #0 done

Schedule: reducePhase done

Master: RPC /var/tmp/824-1000/mr2499-worker0 shutdown error

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/mr2499-master: Map/Reduce task completed

2019/03/24 08:59:25 rpc.Register: method "CleanupFiles" has 1 input parameters; needs exactly three

2019/03/24 08:59:25 rpc.Register: method "Lock" has 1 input parameters; needs exactly three

2019/03/24 08:59:25 rpc.Register: method "Unlock" has 1 input parameters; needs exactly three

2019/03/24 08:59:25 rpc.Register: method "Wait" has 1 input parameters; needs exactly three

/var/tmp/824-1000/mr2499-master: Starting Map/Reduce task test

Schedule: 20 mapPhase tasks (10 I/Os)

2019/03/24 08:59:25 rpc.Register: method "Lock" has 1 input parameters; needs exactly three

2019/03/24 08:59:25 rpc.Register: method "Unlock" has 1 input parameters; needs exactly three

2019/03/24 08:59:25 rpc.Register: method "Lock" has 1 input parameters; needs exactly three

2019/03/24 08:59:25 rpc.Register: method "Unlock" has 1 input parameters; needs exactly three

/var/tmp/824-1000/mr2499-worker1: given mapPhase task #0 on file 824-mrinput-0.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker0: given mapPhase task #1 on file 824-mrinput-1.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker1: mapPhase task #0 done

/var/tmp/824-1000/mr2499-worker0: mapPhase task #1 done

/var/tmp/824-1000/mr2499-worker1: given mapPhase task #2 on file 824-mrinput-2.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker0: given mapPhase task #3 on file 824-mrinput-3.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker1: mapPhase task #2 done

/var/tmp/824-1000/mr2499-worker0: mapPhase task #3 done

/var/tmp/824-1000/mr2499-worker1: given mapPhase task #4 on file 824-mrinput-4.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker0: given mapPhase task #5 on file 824-mrinput-5.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker1: mapPhase task #4 done

/var/tmp/824-1000/mr2499-worker0: mapPhase task #5 done

/var/tmp/824-1000/mr2499-worker0: given mapPhase task #6 on file 824-mrinput-6.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker1: given mapPhase task #7 on file 824-mrinput-7.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker1: mapPhase task #7 done

/var/tmp/824-1000/mr2499-worker0: mapPhase task #6 done

/var/tmp/824-1000/mr2499-worker1: given mapPhase task #8 on file 824-mrinput-8.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker0: given mapPhase task #9 on file 824-mrinput-9.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker1: mapPhase task #8 done

/var/tmp/824-1000/mr2499-worker0: mapPhase task #9 done

/var/tmp/824-1000/mr2499-worker1: given mapPhase task #10 on file 824-mrinput-10.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker0: given mapPhase task #11 on file 824-mrinput-11.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker1: mapPhase task #10 done

/var/tmp/824-1000/mr2499-worker1: given mapPhase task #12 on file 824-mrinput-12.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker0: mapPhase task #11 done

/var/tmp/824-1000/mr2499-worker0: given mapPhase task #13 on file 824-mrinput-13.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker1: mapPhase task #12 done

/var/tmp/824-1000/mr2499-worker1: given mapPhase task #14 on file 824-mrinput-14.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker0: mapPhase task #13 done

/var/tmp/824-1000/mr2499-worker0: given mapPhase task #15 on file 824-mrinput-15.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker1: mapPhase task #14 done

/var/tmp/824-1000/mr2499-worker1: given mapPhase task #16 on file 824-mrinput-16.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker0: mapPhase task #15 done

/var/tmp/824-1000/mr2499-worker0: given mapPhase task #17 on file 824-mrinput-17.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker1: mapPhase task #16 done

/var/tmp/824-1000/mr2499-worker1: given mapPhase task #18 on file 824-mrinput-18.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker0: mapPhase task #17 done

/var/tmp/824-1000/mr2499-worker0: given mapPhase task #19 on file 824-mrinput-19.txt (nios: 10)

/var/tmp/824-1000/mr2499-worker1: mapPhase task #18 done

/var/tmp/824-1000/mr2499-worker0: mapPhase task #19 done

Schedule: mapPhase done

Schedule: 10 reducePhase tasks (20 I/Os)

2019/03/24 08:59:26 rpc.Register: method "Lock" has 1 input parameters; needs exactly three

2019/03/24 08:59:26 rpc.Register: method "Unlock" has 1 input parameters; needs exactly three

/var/tmp/824-1000/mr2499-worker3: given reducePhase task #2 on file (nios: 20)

/var/tmp/824-1000/mr2499-worker2: given reducePhase task #3 on file (nios: 20)

/var/tmp/824-1000/mr2499-worker3: reducePhase task #2 done

/var/tmp/824-1000/mr2499-worker2: reducePhase task #3 done

/var/tmp/824-1000/mr2499-worker3: given reducePhase task #5 on file (nios: 20)

/var/tmp/824-1000/mr2499-worker2: given reducePhase task #4 on file (nios: 20)

/var/tmp/824-1000/mr2499-worker3: reducePhase task #5 done

/var/tmp/824-1000/mr2499-worker3: given reducePhase task #6 on file (nios: 20)

/var/tmp/824-1000/mr2499-worker2: reducePhase task #4 done

/var/tmp/824-1000/mr2499-worker2: given reducePhase task #7 on file (nios: 20)

/var/tmp/824-1000/mr2499-worker3: reducePhase task #6 done

/var/tmp/824-1000/mr2499-worker3: given reducePhase task #8 on file (nios: 20)

/var/tmp/824-1000/mr2499-worker2: reducePhase task #7 done

/var/tmp/824-1000/mr2499-worker2: given reducePhase task #9 on file (nios: 20)

/var/tmp/824-1000/mr2499-worker3: reducePhase task #8 done

/var/tmp/824-1000/mr2499-worker3: given reducePhase task #0 on file (nios: 20)

/var/tmp/824-1000/mr2499-worker2: reducePhase task #9 done

/var/tmp/824-1000/mr2499-worker2: given reducePhase task #1 on file (nios: 20)

/var/tmp/824-1000/mr2499-worker3: reducePhase task #0 done

/var/tmp/824-1000/mr2499-worker2: reducePhase task #1 done

Schedule: reducePhase done

Master: RPC /var/tmp/824-1000/mr2499-worker1 shutdown error

Master: RPC /var/tmp/824-1000/mr2499-worker0 shutdown error

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/mr2499-master: Map/Reduce task completed

PASS

ok _/home/master/study/6.824/src/mapreduce 2.845s

master@master:~/study/6.824/src/mapreduce$

schedule.go

package mapreduce

import (
   "fmt"
   "strings"
   "sync"
   "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).
   //

   //没有任务直接返回
   if ntasks <= 0 {
      return
   }
   //完成标志，应该取值为负数，不能与任务下标重叠
   finishFlag := -2
   //创建可工作worker队列
   usableWorkers := make(chan string)
   //创建任务队列
   waitTaskChan := make(chan int, ntasks)
   //初始化任务队列
   for k:=0; k<ntasks; k++ {
      waitTaskChan <- k
   }
   //创建任务完成计数跟踪线程通知主线程处理结果，主线线程堵塞获取待处理任务
   handleCount := sync.WaitGroup{}
   handleCount.Add(ntasks)
   go func() {
      handleCount.Wait()
      waitTaskChan <- finishFlag
   }()

   //获取待处理任务
   for taskIndex := range waitTaskChan {
      // 标志为处理所有的任务处理完成

      if taskIndex == finishFlag {
         break;
      }
      //两个信道怎么堵塞读取：worker怎么改为不为自旋的方式？
      for {
         var work string;
         //如果有待处理的任务，则获取可用的worker
         select {
         //应该先读新注册的worker.
         case work =<- registerChan:
         case work  =<- usableWorkers:
         }
         if  strings.TrimSpace(work) != "" {
            //创建处理任务线程
            go func(index int) {
               rqArs := new(DoTaskArgs)
               rqArs.JobName=jobName
               if  phase == mapPhase {
                  rqArs.File  = mapFiles[index]
               }
               rqArs.Phase=phase
               rqArs.TaskNumber=index
               rqArs.NumOtherPhase=n_other
               handleResult := false
               defer func(){
                  if handleResult {
                     //worker 处理成功，则完成计数减一，worker返回可用的队列
                     handleCount.Done()
                     usableWorkers <- work
                  } else {
                     //usableWorkers <- work //处理失败的 worker 不应该放回可用worker队列？
                     waitTaskChan <- index
                  }
               }()
               handleResult = call(work, "Worker.DoTask",
                  rqArs, nil)
            }(taskIndex)
            break
         } else {
            //释放cpu
            time.After(time.Second)
         }
      }
   }
   fmt.Printf("Schedule: %v done\n", phase)
}

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