Golang raft.NewLogCache函数代码示例

// setupRaft is used to setup and initialize Raft
func (s *Server) setupRaft() error {
	// If we are in bootstrap mode, enable a single node cluster
	if s.config.Bootstrap {
		s.config.RaftConfig.EnableSingleNode = true
	}

	// Create the FSM
	var err error
	s.fsm, err = NewFSM(s.tombstoneGC, s.config.LogOutput)
	if err != nil {
		return err
	}

	// Create the base raft path
	path := filepath.Join(s.config.DataDir, raftState)
	if err := ensurePath(path, true); err != nil {
		return err
	}

	// Create the backend raft store for logs and stable storage
	store, err := raftboltdb.NewBoltStore(filepath.Join(path, "raft.db"))
	if err != nil {
		return err
	}
	s.raftStore = store

	// Wrap the store in a LogCache to improve performance
	cacheStore, err := raft.NewLogCache(raftLogCacheSize, store)
	if err != nil {
		store.Close()
		return err
	}

	// Create the snapshot store
	snapshots, err := raft.NewFileSnapshotStore(path, snapshotsRetained, s.config.LogOutput)
	if err != nil {
		store.Close()
		return err
	}

	// Create a transport layer
	trans := raft.NewNetworkTransport(s.raftLayer, 3, 10*time.Second, s.config.LogOutput)
	s.raftTransport = trans

	// Setup the peer store
	s.raftPeers = raft.NewJSONPeers(path, trans)

	// Ensure local host is always included if we are in bootstrap mode
	if s.config.Bootstrap {
		peers, err := s.raftPeers.Peers()
		if err != nil {
			store.Close()
			return err
		}
		if !raft.PeerContained(peers, trans.LocalAddr()) {
			s.raftPeers.SetPeers(raft.AddUniquePeer(peers, trans.LocalAddr()))
		}
	}

	// Make sure we set the LogOutput
	s.config.RaftConfig.LogOutput = s.config.LogOutput

	// Setup the Raft store
	s.raft, err = raft.NewRaft(s.config.RaftConfig, s.fsm, cacheStore, store,
		snapshots, s.raftPeers, trans)
	if err != nil {
		store.Close()
		trans.Close()
		return err
	}

	// Start monitoring leadership
	go s.monitorLeadership()
	return nil
}

// setupRaft is used to setup and initialize Raft
func (s *Server) setupRaft() error {
	// If we are in bootstrap mode, enable a single node cluster
	if s.config.Bootstrap || (s.config.DevMode && !s.config.DevDisableBootstrap) {
		s.config.RaftConfig.EnableSingleNode = true
	}

	// Create the FSM
	var err error
	s.fsm, err = NewFSM(s.evalBroker, s.periodicDispatcher, s.config.LogOutput)
	if err != nil {
		return err
	}

	// Create a transport layer
	trans := raft.NewNetworkTransport(s.raftLayer, 3, s.config.RaftTimeout,
		s.config.LogOutput)
	s.raftTransport = trans

	// Create the backend raft store for logs and stable storage
	var log raft.LogStore
	var stable raft.StableStore
	var snap raft.SnapshotStore
	var peers raft.PeerStore
	if s.config.DevMode {
		store := raft.NewInmemStore()
		s.raftInmem = store
		stable = store
		log = store
		snap = raft.NewDiscardSnapshotStore()
		peers = &raft.StaticPeers{}
		s.raftPeers = peers

	} else {
		// Create the base raft path
		path := filepath.Join(s.config.DataDir, raftState)
		if err := ensurePath(path, true); err != nil {
			return err
		}

		// Create the BoltDB backend
		store, err := raftboltdb.NewBoltStore(filepath.Join(path, "raft.db"))
		if err != nil {
			return err
		}
		s.raftStore = store
		stable = store

		// Wrap the store in a LogCache to improve performance
		cacheStore, err := raft.NewLogCache(raftLogCacheSize, store)
		if err != nil {
			store.Close()
			return err
		}
		log = cacheStore

		// Create the snapshot store
		snapshots, err := raft.NewFileSnapshotStore(path, snapshotsRetained, s.config.LogOutput)
		if err != nil {
			if s.raftStore != nil {
				s.raftStore.Close()
			}
			return err
		}
		snap = snapshots

		// Setup the peer store
		s.raftPeers = raft.NewJSONPeers(path, trans)
		peers = s.raftPeers
	}

	// Ensure local host is always included if we are in bootstrap mode
	if s.config.RaftConfig.EnableSingleNode {
		p, err := peers.Peers()
		if err != nil {
			if s.raftStore != nil {
				s.raftStore.Close()
			}
			return err
		}
		if !raft.PeerContained(p, trans.LocalAddr()) {
			peers.SetPeers(raft.AddUniquePeer(p, trans.LocalAddr()))
		}
	}

	// Make sure we set the LogOutput
	s.config.RaftConfig.LogOutput = s.config.LogOutput

	// Setup the leader channel
	leaderCh := make(chan bool, 1)
	s.config.RaftConfig.NotifyCh = leaderCh
	s.leaderCh = leaderCh

	// Setup the Raft store
	s.raft, err = raft.NewRaft(s.config.RaftConfig, s.fsm, log, stable,
		snap, peers, trans)
	if err != nil {
		if s.raftStore != nil {
			s.raftStore.Close()
		}
//.........这里部分代码省略.........

// setupRaft is used to setup and initialize Raft
func (s *Server) setupRaft() error {
	// If we have an unclean exit then attempt to close the Raft store.
	defer func() {
		if s.raft == nil && s.raftStore != nil {
			if err := s.raftStore.Close(); err != nil {
				s.logger.Printf("[ERR] consul: failed to close Raft store: %v", err)
			}
		}
	}()

	// Create the FSM.
	var err error
	s.fsm, err = NewFSM(s.tombstoneGC, s.config.LogOutput)
	if err != nil {
		return err
	}

	// Create a transport layer.
	trans := raft.NewNetworkTransport(s.raftLayer, 3, 10*time.Second, s.config.LogOutput)
	s.raftTransport = trans

	// Make sure we set the LogOutput.
	s.config.RaftConfig.LogOutput = s.config.LogOutput

	// Our version of Raft protocol requires the LocalID to match the network
	// address of the transport.
	s.config.RaftConfig.LocalID = raft.ServerID(trans.LocalAddr())

	// Build an all in-memory setup for dev mode, otherwise prepare a full
	// disk-based setup.
	var log raft.LogStore
	var stable raft.StableStore
	var snap raft.SnapshotStore
	if s.config.DevMode {
		store := raft.NewInmemStore()
		s.raftInmem = store
		stable = store
		log = store
		snap = raft.NewInmemSnapshotStore()
	} else {
		// Create the base raft path.
		path := filepath.Join(s.config.DataDir, raftState)
		if err := ensurePath(path, true); err != nil {
			return err
		}

		// Create the backend raft store for logs and stable storage.
		store, err := raftboltdb.NewBoltStore(filepath.Join(path, "raft.db"))
		if err != nil {
			return err
		}
		s.raftStore = store
		stable = store

		// Wrap the store in a LogCache to improve performance.
		cacheStore, err := raft.NewLogCache(raftLogCacheSize, store)
		if err != nil {
			return err
		}
		log = cacheStore

		// Create the snapshot store.
		snapshots, err := raft.NewFileSnapshotStore(path, snapshotsRetained, s.config.LogOutput)
		if err != nil {
			return err
		}
		snap = snapshots

		// For an existing cluster being upgraded to the new version of
		// Raft, we almost never want to run recovery based on the old
		// peers.json file. We create a peers.info file with a helpful
		// note about where peers.json went, and use that as a sentinel
		// to avoid ingesting the old one that first time (if we have to
		// create the peers.info file because it's not there, we also
		// blow away any existing peers.json file).
		peersFile := filepath.Join(path, "peers.json")
		peersInfoFile := filepath.Join(path, "peers.info")
		if _, err := os.Stat(peersInfoFile); os.IsNotExist(err) {
			if err := ioutil.WriteFile(peersInfoFile, []byte(peersInfoContent), 0755); err != nil {
				return fmt.Errorf("failed to write peers.info file: %v", err)
			}

			// Blow away the peers.json file if present, since the
			// peers.info sentinel wasn't there.
			if _, err := os.Stat(peersFile); err == nil {
				if err := os.Remove(peersFile); err != nil {
					return fmt.Errorf("failed to delete peers.json, please delete manually (see peers.info for details): %v", err)
				}
				s.logger.Printf("[INFO] consul: deleted peers.json file (see peers.info for details)")
			}
		} else if _, err := os.Stat(peersFile); err == nil {
			s.logger.Printf("[INFO] consul: found peers.json file, recovering Raft configuration...")
			configuration, err := raft.ReadPeersJSON(peersFile)
			if err != nil {
				return fmt.Errorf("recovery failed to parse peers.json: %v", err)
			}
			tmpFsm, err := NewFSM(s.tombstoneGC, s.config.LogOutput)
			if err != nil {
				return fmt.Errorf("recovery failed to make temp FSM: %v", err)
//.........这里部分代码省略.........

// Open starts the raft consensus and opens the store.
func (s *Store) Open() error {
	s.mu.Lock()
	defer s.mu.Unlock()

	// Set up logging.
	s.logger = log.New(s.LogOutput, "[discoverd] ", log.LstdFlags)

	// Require listener & advertise address.
	if s.Listener == nil {
		return ErrListenerRequired
	} else if s.Advertise == nil {
		return ErrAdvertiseRequired
	}

	// Create root directory.
	if err := os.MkdirAll(s.path, 0777); err != nil {
		return err
	}

	// Create raft configuration.
	config := raft.DefaultConfig()
	config.HeartbeatTimeout = s.HeartbeatTimeout
	config.ElectionTimeout = s.ElectionTimeout
	config.LeaderLeaseTimeout = s.LeaderLeaseTimeout
	config.CommitTimeout = s.CommitTimeout
	config.LogOutput = s.LogOutput
	config.EnableSingleNode = s.EnableSingleNode
	config.ShutdownOnRemove = false

	// Create multiplexing transport layer.
	raftLayer := newRaftLayer(s.Listener, s.Advertise)

	// Begin listening to TCP port.
	s.transport = raft.NewNetworkTransport(raftLayer, 3, 10*time.Second, os.Stderr)

	// Setup storage layers.
	s.peerStore = raft.NewJSONPeers(s.path, s.transport)
	stableStore, err := raftboltdb.NewBoltStore(filepath.Join(s.path, "raft.db"))
	if err != nil {
		return fmt.Errorf("stable store: %s", err)
	}
	s.stableStore = stableStore

	// Wrap the store in a LogCache to improve performance
	cacheStore, err := raft.NewLogCache(512, stableStore)
	if err != nil {
		stableStore.Close()
		return fmt.Errorf("log cache: %s", err)
	}

	// Create the snapshot store.
	ss, err := raft.NewFileSnapshotStore(s.path, 2, os.Stderr)
	if err != nil {
		return fmt.Errorf("snapshot store: %s", err)
	}

	// Create raft log.
	//
	// The mutex must be unlocked as initializing the raft store may
	// call back into methods which acquire the lock (e.g. Restore)
	s.mu.Unlock()
	r, err := raft.NewRaft(config, s, cacheStore, stableStore, ss, s.peerStore, s.transport)
	s.mu.Lock()
	if err != nil {
		return fmt.Errorf("raft: %s", err)
	}

	// make sure the store was not closed whilst the mutex was unlocked
	select {
	case <-s.closing:
		return ErrShutdown
	default:
	}

	s.raft = r

	// Start goroutine to monitor leadership changes.
	s.wg.Add(1)
	go s.monitorLeaderCh()

	// Start goroutine to check for instance expiry.
	s.wg.Add(1)
	go s.expirer()

	return nil
}

//.........这里部分代码省略.........

	// Batch as many messages as possible into a single appendEntries RPC.
	// There is no downside to setting this too high.
	config.MaxAppendEntries = 1024

	// It could be that the heartbeat goroutine is not scheduled for a while,
	// so relax the default of 500ms.
	config.LeaderLeaseTimeout = timesafeguard.ElectionTimeout
	config.HeartbeatTimeout = timesafeguard.ElectionTimeout
	config.ElectionTimeout = timesafeguard.ElectionTimeout

	// We use prometheus, so hook up the metrics package (used by raft) to
	// prometheus as well.
	sink, err := metrics_prometheus.NewPrometheusSink()
	if err != nil {
		log.Fatal(err)
	}
	metrics.NewGlobal(metrics.DefaultConfig("raftmetrics"), sink)

	bootstrapping := *singleNode || *join != ""
	logStore, err := raft_store.NewLevelDBStore(filepath.Join(*raftDir, "raftlog"), bootstrapping)
	if err != nil {
		log.Fatal(err)
	}
	ircStore, err = raft_store.NewLevelDBStore(filepath.Join(*raftDir, "irclog"), bootstrapping)
	if err != nil {
		log.Fatal(err)
	}
	fsm := &FSM{
		store:             logStore,
		ircstore:          ircStore,
		lastSnapshotState: make(map[uint64][]byte),
	}
	logcache, err := raft.NewLogCache(config.MaxAppendEntries, logStore)
	if err != nil {
		log.Fatal(err)
	}

	node, err = raft.NewRaft(config, fsm, logcache, logStore, fss, peerStore, transport)
	if err != nil {
		log.Fatal(err)
	}

	if *dumpCanaryState != "" {
		canary(fsm, *dumpCanaryState)
		if *dumpHeapProfile != "" {
			debug.FreeOSMemory()
			f, err := os.Create(*dumpHeapProfile)
			if err != nil {
				log.Fatal(err)
			}
			defer f.Close()
			pprof.WriteHeapProfile(f)
		}
		return
	}

	go func() {
		for {
			secondsInState.WithLabelValues(node.State().String()).Inc()
			time.Sleep(1 * time.Second)
		}
	}()

	privaterouter := httprouter.New()
	privaterouter.Handler("GET", "/", exitOnRecoverHandleFunc(handleStatus))

// setupRaft is used to setup and initialize Raft
func (s *Server) setupRaft() error {
	// If we are in bootstrap mode, enable a single node cluster
	if s.config.Bootstrap {
		s.config.RaftConfig.EnableSingleNode = true
	}

	// Create the base state path
	statePath := filepath.Join(s.config.DataDir, tmpStatePath)
	if err := os.RemoveAll(statePath); err != nil {
		return err
	}
	if err := ensurePath(statePath, true); err != nil {
		return err
	}

	// Create the FSM
	var err error
	s.fsm, err = NewFSM(s.tombstoneGC, statePath, s.config.LogOutput)
	if err != nil {
		return err
	}

	// Set the maximum raft size based on 32/64bit. Since we are
	// doing an mmap underneath, we need to limit our use of virtual
	// address space on 32bit, but don't have to care on 64bit.
	dbSize := raftDBSize32bit
	if runtime.GOARCH == "amd64" {
		dbSize = raftDBSize64bit
	}

	// Create the base raft path
	path := filepath.Join(s.config.DataDir, raftState)
	if err := ensurePath(path, true); err != nil {
		return err
	}

	// Create the MDB store for logs and stable storage
	store, err := raftmdb.NewMDBStoreWithSize(path, dbSize)
	if err != nil {
		return err
	}
	s.raftStore = store

	// Wrap the store in a LogCache to improve performance
	cacheStore, err := raft.NewLogCache(raftLogCacheSize, store)
	if err != nil {
		store.Close()
		return err
	}

	// Create the snapshot store
	snapshots, err := raft.NewFileSnapshotStore(path, snapshotsRetained, s.config.LogOutput)
	if err != nil {
		store.Close()
		return err
	}

	// Create a transport layer
	trans := raft.NewNetworkTransport(s.raftLayer, 3, 10*time.Second, s.config.LogOutput)
	s.raftTransport = trans

	// Setup the peer store
	s.raftPeers = raft.NewJSONPeers(path, trans)

	// Ensure local host is always included if we are in bootstrap mode
	if s.config.Bootstrap {
		peers, err := s.raftPeers.Peers()
		if err != nil {
			store.Close()
			return err
		}
		if !raft.PeerContained(peers, trans.LocalAddr()) {
			s.raftPeers.SetPeers(raft.AddUniquePeer(peers, trans.LocalAddr()))
		}
	}

	// Make sure we set the LogOutput
	s.config.RaftConfig.LogOutput = s.config.LogOutput

	// Setup the Raft store
	s.raft, err = raft.NewRaft(s.config.RaftConfig, s.fsm, cacheStore, store,
		snapshots, s.raftPeers, trans)
	if err != nil {
		store.Close()
		trans.Close()
		return err
	}

	// Start monitoring leadership
	go s.monitorLeadership()
	return nil
}

// setupRaft is used to setup and initialize Raft
func (c *cerebrum) setupRaft() error {

	// If we are in bootstrap mode, enable a single node cluster
	if c.config.Bootstrap {
		c.config.RaftConfig.EnableSingleNode = true
	}

	// Create the base state path
	statePath := filepath.Join(c.config.DataPath, tmpStatePath)
	if err := os.RemoveAll(statePath); err != nil {
		return err
	}
	if err := os.MkdirAll(filepath.Dir(statePath), 0755); err != nil {
		return err
	}

	// Create the base raft path
	path := filepath.Join(c.config.DataPath, RaftStateDir)
	if err := os.MkdirAll(filepath.Dir(path), 0755); err != nil {
		return err
	}

	// Create the backend raft store for logs and stable storage
	store, err := raftboltdb.NewBoltStore(filepath.Join(path, "raft.db"))
	if err != nil {
		return err
	}
	c.raftStore = store

	// Wrap the store in a LogCache to improve performance
	cacheStore, err := raft.NewLogCache(c.config.LogCacheSize, store)
	if err != nil {
		store.Close()
		return err
	}

	// Create the snapshot store
	snapshots, err := raft.NewFileSnapshotStore(path, c.config.SnapshotsRetained, c.config.LogOutput)
	if err != nil {
		store.Close()
		return err
	}

	// Try to bind
	addr, err := net.ResolveTCPAddr("tcp", c.config.RaftBindAddr)
	if err != nil {
		return err
	}

	// Start TCP listener
	listener, err := net.ListenTCP("tcp", addr)
	if err != nil {
		return err
	}

	// Create connection layer and transport
	layer := NewRaftLayer(c.dialer, listener.Addr(), c.config.TLSConfig)
	c.raftTransport = raft.NewNetworkTransport(layer, 3, 10*time.Second, c.config.LogOutput)

	// Create TLS connection dispatcher
	dispatcher := yamuxer.NewDispatcher(log.NewLogger(c.config.LogOutput, "dispatcher"), nil)
	dispatcher.Register(connRaft, layer)
	dispatcher.Register(connForward, &ForwardingHandler{c.applier, log.NewLogger(c.config.LogOutput, "forwarder")})

	// Create TLS connection muxer
	c.muxer = yamuxer.New(c.context, &yamuxer.Config{
		Listener:   listener,
		TLSConfig:  c.config.TLSConfig,
		Deadline:   c.config.ConnectionDeadline,
		LogOutput:  c.config.LogOutput,
		Dispatcher: dispatcher,
	})

	// Setup the peer store
	c.raftPeers = raft.NewJSONPeers(path, c.raftTransport)

	// Ensure local host is always included if we are in bootstrap mode
	if c.config.Bootstrap {
		peers, err := c.raftPeers.Peers()
		if err != nil {
			store.Close()
			return err
		}
		if !raft.PeerContained(peers, c.raftTransport.LocalAddr()) {
			c.raftPeers.SetPeers(raft.AddUniquePeer(peers, c.raftTransport.LocalAddr()))
		}
	}

	// Make sure we set the LogOutput
	c.config.RaftConfig.LogOutput = c.config.LogOutput

	// Setup the Raft store
	c.raft, err = raft.NewRaft(c.config.RaftConfig, c.fsm, cacheStore, store,
		snapshots, c.raftPeers, c.raftTransport)
	if err != nil {
		store.Close()
		c.raftTransport.Close()
		return err
	}
//.........这里部分代码省略.........