{"id":96,"date":"2022-03-07T08:49:46","date_gmt":"2022-03-07T08:49:46","guid":{"rendered":"https:\/\/blog.liguanxin.cn\/?p=96"},"modified":"2022-03-07T10:58:19","modified_gmt":"2022-03-07T10:58:19","slug":"mit-6-824%e5%88%86%e5%b8%83%e5%bc%8f%e7%b3%bb%e7%bb%9f-lab1%e5%ae%9e%e7%8e%b0","status":"publish","type":"post","link":"https:\/\/blog.liguanxin.cn\/index.php\/2022\/03\/07\/mit-6-824%e5%88%86%e5%b8%83%e5%bc%8f%e7%b3%bb%e7%bb%9f-lab1%e5%ae%9e%e7%8e%b0\/","title":{"rendered":"MIT 6.824\u5206\u5e03\u5f0f\u7cfb\u7edf\u2014\u2014lab1\u5b9e\u73b0"},"content":{"rendered":"

\u4ee3\u7801\uff1aMIT6.824-2022\/lab1 at main \u00b7 latrawy\/MIT6.824-2022 (github.com)<\/a><\/p>\n

Coordinator\u7ed3\u6784<\/h3>\n
type Coordinator struct {\n    WorkerNum int\n    WorkerState []int       \/\/ -1 - dead, 0 - idle, 1 - working\n    WorkerCallTime []int\n    MapTaskState []int      \/\/ 0 - no allocate, 1 - dealing, 2 - completed\n    ReduceTaskState []int   \/\/ 0 - no allocate, 1 - dealing, 2 - completed\n    Filename []string\n    Map2Worker []int\n    nReduce int\n    Reduce2Worker []int\n    mux sync.Mutex\n}<\/code><\/pre>\n
\u5176\u4e2dWorkerCallTime\u5728worker\u6bcf\u6b21\u8bf7\u6c42\u4e4b\u540e\u90fd\u4f1a\u66f4\u65b0\u4e3a0\uff0c\u6bcf\u8f6e\u8be2m.Done()\u4f1a\u8ba9WorkerCallTime\u6570\u7ec4\u5143\u7d20\u52a0\u4e00\uff0c\u4ee3\u8868\u8fc7\u53bb\u4e00\u79d2\u3002<\/p>\n
Map2Worker\u6570\u7ec4\u4ee5\u53caReduce2Worker\u6570\u7ec4\u4ee3\u8868map\u4efb\u52a1\u6216\u8005reduce\u4efb\u52a1\u5206\u914d\u7ed9\u4e86\u54ea\u4e2aworker\uff08\u8bb0\u5f55workerID\uff09\u3002<\/p>\n
\u6838\u5fc3\u51fd\u6570<\/h3>\n
    \n
  • \n
    coordinator.go<\/h4>\n<\/li>\n<\/ul>\n
    func (c *Coordinator) GetID(args *GetIdArgs, reply *GetIdReply) error {}<\/code><\/pre>\n
    worker\u542f\u52a8\u540e\uff0c\u9996\u5148\u901a\u8fc7rpc\u8c03\u7528\u8fd9\u4e2a\u51fd\u6570\u6765\u83b7\u53d6\u81ea\u8eabID\u3002<\/p>\n
    func (c *Coordinator) DealFailed(args *DealFailedArgs, reply *DealFailedReply) error<\/code><\/pre>\n
    \u5f53worker\u5904\u7406\u5931\u8d25\u65f6\uff08\u5982\u6587\u4ef6\u8bfb\u53d6\u5931\u8d25\uff0c\u6587\u4ef6\u4fdd\u5b58\u5931\u8d25\uff09\uff0c\u653e\u5f03\u4efb\u52a1\u5e76\u901a\u77e5coordinator\uff0c\u8ba9worker\u91cd\u65b0\u4e3a\u7a7a\u95f2\u72b6\u6001\u3002<\/p>\n
    func (c *Coordinator) GetTask(args *GetTaskArgs, reply *GetTaskReply) error {}<\/code><\/pre>\n
    \u7a7a\u95f2\u7684worker\u6bcf\u9694\u4e00\u79d2\u8f6e\u8be2\u5bf9coordinator\u8bf7\u6c42\u4efb\u52a1\uff0ccoordinator\u4f18\u5148\u5206\u914dmap\u4efb\u52a1\uff0cmap\u4efb\u52a1\u5168\u90e8\u5b8c\u6210\u540e\u5206\u914dreduce\u4efb\u52a1\uff0c\u5426\u5219\u8fd4\u56de\u7a7a\u95f2\u72b6\u6001\u3002
    \n\u5176\u4e2d\u8bf7\u6c42\u4efb\u52a1\u7684rpc\u7ed3\u6784\u5982\u4e0b\uff1a<\/p>\n
    type GetTaskReply struct {\n    TaskType int   \/\/ -1 - exit, 0 - idle, 1 - map task, 2 - reduce task\n    MapTaskID int\n    MapFilename string\n    ReduceTaskID int\n    ReduceNum int\n    MapNum int\n}<\/code><\/pre>\n
    func (c *Coordinator) Done() bool {}<\/code><\/pre>\n
    \u7531main\/mrcoordinator.go\u53ef\u77e5\u6bcf\u96941\u79d2\u4f1a\u6267\u884c\u4e00\u6b21Done()\uff0c\u53ef\u4ee5\u5229\u7528\u8fd9\u4e2a\u6027\u8d28\u4f5c\u4e3a\u8ba1\u65f6\u5668\uff0c\u6bcf\u6267\u884c\u4e00\u6b21Done()\u8ba9WorkerCallTime\u6570\u7ec4\u5143\u7d20\u52a0\u4e00\uff0c\u5f53\u67d0\u4e2a\u5143\u7d20\u5927\u4e8e10\uff0c\u53ef\u4ee5\u8ba4\u4e3a\u8be5worker\u5df2\u7ecf\u5931\u8054\uff0c\u628a\u72b6\u6001\u7f6e\u4e3adead\uff0c\u5e76\u8ba9\u76f8\u5173\u4efb\u52a1\u91cd\u65b0\u5206\u914d\u3002<\/p>\n
      \n
    • \n
      worker.go<\/h4>\n<\/li>\n<\/ul>\n
      func ihash(key string) int {}<\/code><\/pre>\n
      \u53ef\u4ee5\u6839\u636ekey\u751f\u6210\u5bf9\u5e94\u7684hash\u503c\uff0c\u5bf9nReduce\u53d6\u6a21\u53ef\u4ee5\u5f97\u77e5\u8be5key\u5e94\u8be5\u5206\u914d\u7ed9\u54ea\u4e2areduce\u4efb\u52a1\u8fdb\u884c\u5904\u7406\u3002<\/p>\n
      func Worker(mapf func(string, string) []KeyValue, reducef func(string, []string) string) {}<\/code><\/pre>\n
      woker\u4e3b\u7a0b\u5e8f\u3002\u7b2c\u4e00\u6b21\u6267\u884c\u4f1a\u901a\u8fc7GetID()\u5411coordinator\u83b7\u53d6\u81ea\u8eab\u7684ID\uff0c\u7136\u540e\u4f1a\u4ee5\u4e00\u79d2\u7684\u95f4\u9694\u901a\u8fc7\u51fd\u6570GetTask(ID, mapf, reducef)\u8f6e\u8be2\u5411coordinator\u8bf7\u6c42\u4efb\u52a1\u3002<\/p>\n
      func DealMap(ID int, reply *GetTaskReply, mapf func(string, string) []KeyValue) {}<\/code><\/pre>\n
      \u5904\u7406map\u4efb\u52a1\uff0c\u5229\u7528\u81ea\u5b9a\u4e49\u7684map\u51fd\u6570\u5bf9\u6587\u4ef6\u8fdb\u884c\u5904\u7406\uff0c\u628a\u4e2d\u95f4\u7ed3\u679c\u4ee5json\u7684\u683c\u5f0f\u4fdd\u5b58\u5728\u6587\u4ef6\u4e2d\uff0c\u6587\u4ef6\u547d\u540d\u4e3amr-X-Y\uff0c\u5176\u4e2dX\u4ee3\u8868map\u4efb\u52a1\u7684ID\uff0cY\u4ee3\u8868reduce\u4efb\u52a1\u7684ID\uff0c\u603b\u5171\u4fdd\u5b58X*Y\u4e2a\u4e2d\u95f4\u6587\u4ef6\u3002\u4fdd\u5b58\u5b8c\u6bd5\u540e\u4f1a\u8c03\u7528Coordinator.MapSuccess\u901a\u77e5coordinator\u4efb\u52a1\u5b8c\u6210\uff0c\u8ba9\u81ea\u8eab\u7684\u72b6\u6001\u91cd\u65b0\u8bbe\u7f6e\u4e3a\u7a7a\u95f2\u3002\uff08\u6839\u636eMapReduce\u7684\u8bba\u6587\u4f1a\u5bf9\u4e2d\u95f4\u7ed3\u679c\u8fdb\u884c\u4e00\u6b21\u6392\u5e8f\uff0c\u4ee5\u51cf\u5c11reduce\u65f6\u5019\u7684\u6392\u5e8f\u65f6\u95f4\uff09<\/p>\n
      func DealReduce(ID int, reply *GetTaskReply, reducef func(string, []string) string) {}<\/code><\/pre>\n
      \u5904\u7406reduce\u4efb\u52a1\uff0c\u9996\u5148\u83b7\u5f97reduceID\u76f8\u5bf9\u5e94\u7684\u4e2d\u95f4\u6587\u4ef6\u540dmr-X-reduceID\uff0c\u8bfb\u53d6\u5176\u4e2d\u7684json\u6570\u636e\uff0c\u5408\u5e76\u4e4b\u540e\u8fdb\u884c\u6392\u5e8f\u3002\u901a\u8fc7\u81ea\u5b9a\u4e49\u7684reduce\u51fd\u6570\u5bf9\u6570\u636e\u8fdb\u884c\u5904\u7406\uff0c\u5b8c\u6210\u540e\u7ed3\u679c\u4fdd\u5b58\u5728mr-out-reduceID\u4e2d\u3002\u6700\u540e\u8c03\u7528Coordinator.ReduceSuccess\u901a\u77e5coordinator\u4efb\u52a1\u5b8c\u6210\uff0c\u8ba9\u81ea\u8eab\u7684\u72b6\u6001\u91cd\u65b0\u8bbe\u7f6e\u4e3a\u7a7a\u95f2\u3002<\/p>\n
      \u6d4b\u8bd5<\/h3>\n
      \"\"<\/p>\n
      \u5f85\u4f18\u5316<\/h3>\n
      \u4fdd\u5b58\u6587\u4ef6\u65f6\u5148\u5199\u5165\u4e34\u65f6\u6587\u4ef6\uff08\u6587\u4ef6\u540d\u9700\u8981\u968f\u673a\u751f\u6210\uff09\uff0c\u5199\u5165\u5b8c\u6210\u540e\u518d\u91cd\u547d\u540d\u4e3a\u5bf9\u5e94\u6587\u4ef6\u540d\uff0c\u53ef\u4ee5\u907f\u514dworker crash\u4e4b\u540e\u5bfc\u81f4\u6587\u4ef6\u4e0d\u53ef\u7528\u7684\u60c5\u51b5\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
      \u4ee3\u7801\uff1aMIT6.824-2022\/lab1 at main \u00b7 latrawy\/MIT6.824-2022 ( […]<\/p>\n","protected":false},"author":1,"featured_media":102,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[5],"tags":[8,7],"_links":{"self":[{"href":"https:\/\/blog.liguanxin.cn\/index.php\/wp-json\/wp\/v2\/posts\/96"}],"collection":[{"href":"https:\/\/blog.liguanxin.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.liguanxin.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.liguanxin.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.liguanxin.cn\/index.php\/wp-json\/wp\/v2\/comments?post=96"}],"version-history":[{"count":7,"href":"https:\/\/blog.liguanxin.cn\/index.php\/wp-json\/wp\/v2\/posts\/96\/revisions"}],"predecessor-version":[{"id":106,"href":"https:\/\/blog.liguanxin.cn\/index.php\/wp-json\/wp\/v2\/posts\/96\/revisions\/106"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.liguanxin.cn\/index.php\/wp-json\/wp\/v2\/media\/102"}],"wp:attachment":[{"href":"https:\/\/blog.liguanxin.cn\/index.php\/wp-json\/wp\/v2\/media?parent=96"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.liguanxin.cn\/index.php\/wp-json\/wp\/v2\/categories?post=96"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.liguanxin.cn\/index.php\/wp-json\/wp\/v2\/tags?post=96"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}