first init:MIT.6.824

6.824/.gitignore

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+pkg/
+api.key
+*-handin.tar.gz
+cscope.files
+cscope.out

6.824/Makefile

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+# This is the Makefile helping you submit the labs.  
+# Just create 6.824/api.key with your API key in it, 
+# and submit your lab with the following command: 
+#     $ make [lab1|lab2a|lab2b|lab2c|lab3a|lab3b|lab4a|lab4b]
+
+LABS=" lab1 lab2a lab2b lab2c lab3a lab3b lab4a lab4b "
+
+%:
+	@echo "Preparing $@-handin.tar.gz"
+	@echo "Checking for committed temporary files..."
+	@if git ls-files | grep -E 'mrtmp|mrinput' > /dev/null; then \
+		echo "" ; \
+		echo "OBS! You have committed some large temporary files:" ; \
+		echo "" ; \
+		git ls-files | grep -E 'mrtmp|mrinput' | sed 's/^/\t/' ; \
+		echo "" ; \
+		echo "Follow the instructions at http://stackoverflow.com/a/308684/472927" ; \
+		echo "to remove them, and then run make again." ; \
+		echo "" ; \
+		exit 1 ; \
+	fi
+	@if echo $(LABS) | grep -q " $@ " ; then \
+		echo "Tarring up your submission..." ; \
+		tar cvzf $@-handin.tar.gz \
+			"--exclude=src/main/pg-*.txt" \
+			"--exclude=src/main/diskvd" \
+			"--exclude=src/mapreduce/824-mrinput-*.txt" \
+			"--exclude=mrtmp.*" \
+			"--exclude=src/main/diff.out" \
+			Makefile src; \
+		if ! test -e api.key ; then \
+			echo "Missing $(PWD)/api.key. Please create the file with your key in it or submit the $@-handin.tar.gz via the web interface."; \
+		else \
+			echo "Are you sure you want to submit $@? Enter 'yes' to continue:"; \
+			read line; \
+			if test "$$line" != "yes" ; then echo "Giving up submission"; exit; fi; \
+			if test `stat -c "%s" "$@-handin.tar.gz" 2>/dev/null || stat -f "%z" "$@-handin.tar.gz"` -ge 20971520 ; then echo "File exceeds 20MB."; exit; fi; \
+			mv api.key api.key.fix ; \
+			cat api.key.fix | tr -d '\n' > api.key ; \
+			rm api.key.fix ; \
+			curl -F file=@$@-handin.tar.gz -F "key=<api.key" \
+			https://6824.scripts.mit.edu/2017/handin.py/upload > /dev/null || { \
+				echo ; \
+				echo "Submit seems to have failed."; \
+				echo "Please upload the tarball manually on the submission website."; } \
+		fi; \
+	else \
+		echo "Bad target $@. Usage: make [$(LABS)]"; \
+	fi

6.824/make_env.sh

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+#!/bin/bash
+
+export GOPATH=$PWD

6.824/src/.gitignore

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+*.*/
+mrtmp.*
+824-mrinput-*.txt
+/main/diff.out
+/mapreduce/x.txt
+/pbservice/x.txt
+/kvpaxos/x.txt

6.824/src/kvraft/client.go

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+package raftkv
+
+import "labrpc"
+import "crypto/rand"
+import "math/big"
+
+
+type Clerk struct {
+	servers []*labrpc.ClientEnd
+	// You will have to modify this struct.
+}
+
+func nrand() int64 {
+	max := big.NewInt(int64(1) << 62)
+	bigx, _ := rand.Int(rand.Reader, max)
+	x := bigx.Int64()
+	return x
+}
+
+func MakeClerk(servers []*labrpc.ClientEnd) *Clerk {
+	ck := new(Clerk)
+	ck.servers = servers
+	// You'll have to add code here.
+	return ck
+}
+
+//
+// fetch the current value for a key.
+// returns "" if the key does not exist.
+// keeps trying forever in the face of all other errors.
+//
+// you can send an RPC with code like this:
+// ok := ck.servers[i].Call("RaftKV.Get", &args, &reply)
+//
+// the types of args and reply (including whether they are pointers)
+// must match the declared types of the RPC handler function's
+// arguments. and reply must be passed as a pointer.
+//
+func (ck *Clerk) Get(key string) string {
+
+	// You will have to modify this function.
+	return ""
+}
+
+//
+// shared by Put and Append.
+//
+// you can send an RPC with code like this:
+// ok := ck.servers[i].Call("RaftKV.PutAppend", &args, &reply)
+//
+// the types of args and reply (including whether they are pointers)
+// must match the declared types of the RPC handler function's
+// arguments. and reply must be passed as a pointer.
+//
+func (ck *Clerk) PutAppend(key string, value string, op string) {
+	// You will have to modify this function.
+}
+
+func (ck *Clerk) Put(key string, value string) {
+	ck.PutAppend(key, value, "Put")
+}
+func (ck *Clerk) Append(key string, value string) {
+	ck.PutAppend(key, value, "Append")
+}

6.824/src/kvraft/common.go

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+package raftkv
+
+const (
+	OK       = "OK"
+	ErrNoKey = "ErrNoKey"
+)
+
+type Err string
+
+// Put or Append
+type PutAppendArgs struct {
+	Key   string
+	Value string
+	Op    string // "Put" or "Append"
+	// You'll have to add definitions here.
+	// Field names must start with capital letters,
+	// otherwise RPC will break.
+}
+
+type PutAppendReply struct {
+	WrongLeader bool
+	Err         Err
+}
+
+type GetArgs struct {
+	Key string
+	// You'll have to add definitions here.
+}
+
+type GetReply struct {
+	WrongLeader bool
+	Err         Err
+	Value       string
+}