shardmaster

Documentation

Index

• Constants
• type Clerk
  • func MakeClerk(servers []*labrpc.ClientEnd) *Clerk
  • func (ck *Clerk) Join(servers map[int][]string)
  • func (ck *Clerk) Leave(gids []int)
  • func (ck *Clerk) Move(shard int, gid int)
  • func (ck *Clerk) Query(num int) Config
• type Config
• type Err
• type JoinArgs
• type JoinReply
• type LeaveArgs
• type LeaveReply
• type MoveArgs
• type MoveReply
• type Op
• type QueryArgs
• type QueryReply
• type ShardMaster
  • func StartServer(servers []*labrpc.ClientEnd, me int, persister *raft.Persister) *ShardMaster
  • func (sm *ShardMaster) Join(args *JoinArgs, reply *JoinReply)
  • func (sm *ShardMaster) Kill()
  • func (sm *ShardMaster) Leave(args *LeaveArgs, reply *LeaveReply)
  • func (sm *ShardMaster) Move(args *MoveArgs, reply *MoveReply)
  • func (sm *ShardMaster) Query(args *QueryArgs, reply *QueryReply)
  • func (sm *ShardMaster) Raft() *raft.Raft

Constants

const NShards = 10

The number of shards.

const (
	OK = "OK"
)

Types

type Clerk

type Clerk struct {
	// contains filtered or unexported fields
}

func MakeClerk

func MakeClerk(servers []*labrpc.ClientEnd) *Clerk

func (*Clerk) Join

func (ck *Clerk) Join(servers map[int][]string)

func (*Clerk) Leave

func (ck *Clerk) Leave(gids []int)

func (*Clerk) Move

func (ck *Clerk) Move(shard int, gid int)

func (*Clerk) Query

func (ck *Clerk) Query(num int) Config

type Config

type Config struct {
	Num    int              // config number
	Shards [NShards]int     // shard -> gid
	Groups map[int][]string // gid -> servers[]
}

A configuration -- an assignment of shards to groups. Please don't change this.

type Err

type Err string

type JoinArgs

type JoinArgs struct {
	Servers map[int][]string // new GID -> servers mappings
}

type JoinReply

type JoinReply struct {
	WrongLeader bool
	Err         Err
}

type LeaveArgs

type LeaveArgs struct {
	GIDs []int
}

type LeaveReply

type LeaveReply struct {
	WrongLeader bool
	Err         Err
}

type MoveArgs

type MoveArgs struct {
	Shard int
	GID   int
}

type MoveReply

type MoveReply struct {
	WrongLeader bool
	Err         Err
}

type Op

type Op struct {
}

type QueryArgs

type QueryArgs struct {
	Num int // desired config number
}

type QueryReply

type QueryReply struct {
	WrongLeader bool
	Err         Err
	Config      Config
}

type ShardMaster

type ShardMaster struct {
	// contains filtered or unexported fields
}

func StartServer

func StartServer(servers []*labrpc.ClientEnd, me int, persister *raft.Persister) *ShardMaster

servers[] contains the ports of the set of servers that will cooperate via Paxos to form the fault-tolerant shardmaster service. me is the index of the current server in servers[].

func (*ShardMaster) Join

func (sm *ShardMaster) Join(args *JoinArgs, reply *JoinReply)

func (*ShardMaster) Kill

func (sm *ShardMaster) Kill()

the tester calls Kill() when a ShardMaster instance won't be needed again. you are not required to do anything in Kill(), but it might be convenient to (for example) turn off debug output from this instance.

func (*ShardMaster) Leave

func (sm *ShardMaster) Leave(args *LeaveArgs, reply *LeaveReply)

func (*ShardMaster) Move

func (sm *ShardMaster) Move(args *MoveArgs, reply *MoveReply)

func (*ShardMaster) Query

func (sm *ShardMaster) Query(args *QueryArgs, reply *QueryReply)

func (*ShardMaster) Raft

func (sm *ShardMaster) Raft() *raft.Raft

needed by shardkv tester