config: backport the rename of fastsync to blocksync (#9259)

This is largely a cherry pick of #6755 with some additional fixups added where detected. This change moves the blockchain package to a package called blocksync. Additionally, it renames the relevant uses of the term `fastsync` to `blocksync`. closes: #9227 #### PR checklist - [ ] Tests written/updated, or no tests needed - [x] `CHANGELOG_PENDING.md` updated, or no changelog entry needed - [x] Updated relevant documentation (`docs/`) and code comments, or no documentation updates needed
2026-01-03 03:35:19 +00:00 · 2022-08-17 11:19:20 -04:00
parent 3003e05581
commit 1069ffc6aa
31 changed files with 235 additions and 197 deletions
--- a/CHANGELOG_PENDING.md
+++ b/CHANGELOG_PENDING.md
@@ -10,6 +10,8 @@ Friendly reminder, we have a [bug bounty program](https://hackerone.com/tendermi

 - CLI/RPC/Config

+  - [config] \#9259 Rename the fastsync section and the fast_sync key blocksync and block_sync respectively
+
 - Apps

  - [abci/counter] \#6684 Delete counter example app
--- a/blockchain/msgs.go
+++ b/blockchain/msgs.go
@@ -1,4 +1,4 @@
-package blockchain
+package blocksync

 import (
 	"errors"
@@ -6,7 +6,7 @@ import (

 	"github.com/gogo/protobuf/proto"

-	bcproto "github.com/tendermint/tendermint/proto/tendermint/blockchain"
+	bcproto "github.com/tendermint/tendermint/proto/tendermint/blocksync"
 	"github.com/tendermint/tendermint/types"
 )

--- a/blockchain/msgs_test.go
+++ b/blockchain/msgs_test.go
@@ -1,4 +1,4 @@
-package blockchain
+package blocksync_test

 import (
 	"encoding/hex"
@@ -9,7 +9,8 @@ import (
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"

-	bcproto "github.com/tendermint/tendermint/proto/tendermint/blockchain"
+	"github.com/tendermint/tendermint/blocksync"
+	bcproto "github.com/tendermint/tendermint/proto/tendermint/blocksync"
 	"github.com/tendermint/tendermint/types"
 )

@@ -28,7 +29,7 @@ func TestBcBlockRequestMessageValidateBasic(t *testing.T) {
 		tc := tc
 		t.Run(tc.testName, func(t *testing.T) {
 			request := bcproto.BlockRequest{Height: tc.requestHeight}
-			assert.Equal(t, tc.expectErr, ValidateMsg(&request) != nil, "Validate Basic had an unexpected result")
+			assert.Equal(t, tc.expectErr, blocksync.ValidateMsg(&request) != nil, "Validate Basic had an unexpected result")
 		})
 	}
 }
@@ -48,14 +49,14 @@ func TestBcNoBlockResponseMessageValidateBasic(t *testing.T) {
 		tc := tc
 		t.Run(tc.testName, func(t *testing.T) {
 			nonResponse := bcproto.NoBlockResponse{Height: tc.nonResponseHeight}
-			assert.Equal(t, tc.expectErr, ValidateMsg(&nonResponse) != nil, "Validate Basic had an unexpected result")
+			assert.Equal(t, tc.expectErr, blocksync.ValidateMsg(&nonResponse) != nil, "Validate Basic had an unexpected result")
 		})
 	}
 }

 func TestBcStatusRequestMessageValidateBasic(t *testing.T) {
 	request := bcproto.StatusRequest{}
-	assert.NoError(t, ValidateMsg(&request))
+	assert.NoError(t, blocksync.ValidateMsg(&request))
 }

 func TestBcStatusResponseMessageValidateBasic(t *testing.T) {
@@ -73,7 +74,7 @@ func TestBcStatusResponseMessageValidateBasic(t *testing.T) {
 		tc := tc
 		t.Run(tc.testName, func(t *testing.T) {
 			response := bcproto.StatusResponse{Height: tc.responseHeight}
-			assert.Equal(t, tc.expectErr, ValidateMsg(&response) != nil, "Validate Basic had an unexpected result")
+			assert.Equal(t, tc.expectErr, blocksync.ValidateMsg(&response) != nil, "Validate Basic had an unexpected result")
 		})
 	}
 }
--- a/blockchain/pool.go
+++ b/blockchain/pool.go
@@ -1,4 +1,4 @@
-package blockchain
+package blocksync

 import (
 	"errors"
@@ -58,7 +58,7 @@ var peerTimeout = 15 * time.Second // not const so we can override with tests
 	are not at peer limits, we can probably switch to consensus reactor
 */

-// BlockPool keeps track of the fast sync peers, block requests and block responses.
+// BlockPool keeps track of the block sync peers, block requests and block responses.
 type BlockPool struct {
 	service.BaseService
 	startTime time.Time
--- a/blockchain/pool_test.go
+++ b/blockchain/pool_test.go
@@ -1,4 +1,4 @@
-package blockchain
+package blocksync

 import (
 	"fmt"
--- a/blockchain/reactor.go
+++ b/blockchain/reactor.go
@@ -1,4 +1,4 @@
-package blockchain
+package blocksync

 import (
 	"fmt"
@@ -7,15 +7,15 @@ import (

 	"github.com/tendermint/tendermint/libs/log"
 	"github.com/tendermint/tendermint/p2p"
-	bcproto "github.com/tendermint/tendermint/proto/tendermint/blockchain"
+	bcproto "github.com/tendermint/tendermint/proto/tendermint/blocksync"
 	sm "github.com/tendermint/tendermint/state"
 	"github.com/tendermint/tendermint/store"
 	"github.com/tendermint/tendermint/types"
 )

 const (
-	// BlockchainChannel is a channel for blocks and status updates (`BlockStore` height)
-	BlockchainChannel = byte(0x40)
+	// BlocksyncChannel is a channel for blocks and status updates (`BlockStore` height)
+	BlocksyncChannel = byte(0x40)

 	trySyncIntervalMS = 10

@@ -30,7 +30,7 @@ const (
 )

 type consensusReactor interface {
-	// for when we switch from blockchain reactor and fast sync to
+	// for when we switch from blockchain reactor and block sync to
 	// the consensus machine
 	SwitchToConsensus(state sm.State, skipWAL bool)
 }
@@ -54,7 +54,7 @@ type Reactor struct {
 	blockExec *sm.BlockExecutor
 	store     *store.BlockStore
 	pool      *BlockPool
-	fastSync  bool
+	blockSync bool

 	requestsCh <-chan BlockRequest
 	errorsCh   <-chan peerError
@@ -62,7 +62,7 @@ type Reactor struct {

 // NewReactor returns new reactor instance.
 func NewReactor(state sm.State, blockExec *sm.BlockExecutor, store *store.BlockStore,
-	fastSync bool) *Reactor {
+	blockSync bool) *Reactor {

 	if state.LastBlockHeight != store.Height() {
 		panic(fmt.Sprintf("state (%v) and store (%v) height mismatch", state.LastBlockHeight,
@@ -85,7 +85,7 @@ func NewReactor(state sm.State, blockExec *sm.BlockExecutor, store *store.BlockS
 		blockExec:    blockExec,
 		store:        store,
 		pool:         pool,
-		fastSync:     fastSync,
+		blockSync:    blockSync,
 		requestsCh:   requestsCh,
 		errorsCh:     errorsCh,
 	}
@@ -101,7 +101,7 @@ func (bcR *Reactor) SetLogger(l log.Logger) {

 // OnStart implements service.Service.
 func (bcR *Reactor) OnStart() error {
-	if bcR.fastSync {
+	if bcR.blockSync {
 		err := bcR.pool.Start()
 		if err != nil {
 			return err
@@ -111,9 +111,9 @@ func (bcR *Reactor) OnStart() error {
 	return nil
 }

-// SwitchToFastSync is called by the state sync reactor when switching to fast sync.
-func (bcR *Reactor) SwitchToFastSync(state sm.State) error {
-	bcR.fastSync = true
+// SwitchToBlockSync is called by the state sync reactor when switching to block sync.
+func (bcR *Reactor) SwitchToBlockSync(state sm.State) error {
+	bcR.blockSync = true
 	bcR.initialState = state

 	bcR.pool.height = state.LastBlockHeight + 1
@@ -127,7 +127,7 @@ func (bcR *Reactor) SwitchToFastSync(state sm.State) error {

 // OnStop implements service.Service.
 func (bcR *Reactor) OnStop() {
-	if bcR.fastSync {
+	if bcR.blockSync {
 		if err := bcR.pool.Stop(); err != nil {
 			bcR.Logger.Error("Error stopping pool", "err", err)
 		}
@@ -138,7 +138,7 @@ func (bcR *Reactor) OnStop() {
 func (bcR *Reactor) GetChannels() []*p2p.ChannelDescriptor {
 	return []*p2p.ChannelDescriptor{
 		{
-			ID:                  BlockchainChannel,
+			ID:                  BlocksyncChannel,
 			Priority:            5,
 			SendQueueCapacity:   1000,
 			RecvBufferCapacity:  50 * 4096,
@@ -157,7 +157,7 @@ func (bcR *Reactor) AddPeer(peer p2p.Peer) {
 		return
 	}

-	peer.Send(BlockchainChannel, msgBytes)
+	peer.Send(BlocksyncChannel, msgBytes)
 	// it's OK if send fails. will try later in poolRoutine

 	// peer is added to the pool once we receive the first
@@ -188,7 +188,7 @@ func (bcR *Reactor) respondToPeer(msg *bcproto.BlockRequest,
 			return false
 		}

-		return src.TrySend(BlockchainChannel, msgBytes)
+		return src.TrySend(BlocksyncChannel, msgBytes)
 	}

 	bcR.Logger.Info("Peer asking for a block we don't have", "src", src, "height", msg.Height)
@@ -199,7 +199,7 @@ func (bcR *Reactor) respondToPeer(msg *bcproto.BlockRequest,
 		return false
 	}

-	return src.TrySend(BlockchainChannel, msgBytes)
+	return src.TrySend(BlocksyncChannel, msgBytes)
 }

 // Receive implements Reactor by handling 4 types of messages (look below).
@@ -239,7 +239,7 @@ func (bcR *Reactor) Receive(chID byte, src p2p.Peer, msgBytes []byte) {
 			bcR.Logger.Error("could not convert msg to protobut", "err", err)
 			return
 		}
-		src.TrySend(BlockchainChannel, msgBytes)
+		src.TrySend(BlocksyncChannel, msgBytes)
 	case *bcproto.StatusResponse:
 		// Got a peer status. Unverified.
 		bcR.pool.SetPeerRange(src.ID(), msg.Base, msg.Height)
@@ -291,7 +291,7 @@ func (bcR *Reactor) poolRoutine(stateSynced bool) {
 					continue
 				}

-				queued := peer.TrySend(BlockchainChannel, msgBytes)
+				queued := peer.TrySend(BlocksyncChannel, msgBytes)
 				if !queued {
 					bcR.Logger.Debug("Send queue is full, drop block request", "peer", peer.ID(), "height", request.Height)
 				}
@@ -409,7 +409,7 @@ FOR_LOOP:

 			if blocksSynced%100 == 0 {
 				lastRate = 0.9*lastRate + 0.1*(100/time.Since(lastHundred).Seconds())
-				bcR.Logger.Info("Fast Sync Rate", "height", bcR.pool.height,
+				bcR.Logger.Info("Block Sync Rate", "height", bcR.pool.height,
 					"max_peer_height", bcR.pool.MaxPeerHeight(), "blocks/s", lastRate)
 				lastHundred = time.Now()
 			}
@@ -430,7 +430,7 @@ func (bcR *Reactor) BroadcastStatusRequest() error {
 		return fmt.Errorf("could not convert msg to proto: %w", err)
 	}

-	bcR.Switch.Broadcast(BlockchainChannel, bm)
+	bcR.Switch.Broadcast(BlocksyncChannel, bm)

 	return nil
 }
--- a/blockchain/reactor_test.go
+++ b/blockchain/reactor_test.go
@@ -1,4 +1,4 @@
-package blockchain
+package blocksync

 import (
 	"fmt"
--- a/cmd/tendermint/commands/root.go
+++ b/cmd/tendermint/commands/root.go
@@ -53,6 +53,11 @@ func ParseConfig(cmd *cobra.Command) (*cfg.Config, error) {
 	if err := conf.ValidateBasic(); err != nil {
 		return nil, fmt.Errorf("error in config file: %v", err)
 	}
+	if warnings := conf.CheckDeprecated(); len(warnings) > 0 {
+		for _, warning := range warnings {
+			logger.Info("deprecated usage found in configuration file", "usage", warning)
+		}
+	}
 	return conf, nil
 }

--- a/cmd/tendermint/commands/run_node.go
+++ b/cmd/tendermint/commands/run_node.go
@@ -31,7 +31,7 @@ func AddNodeFlags(cmd *cobra.Command) {
 		"socket address to listen on for connections from external priv_validator process")

 	// node flags
-	cmd.Flags().Bool("fast_sync", config.FastSyncMode, "fast blockchain syncing")
+	cmd.Flags().Bool("block_sync", config.BlockSyncMode, "sync the block chain using the blocksync algorithm")
 	cmd.Flags().BytesHexVar(
 		&genesisHash,
 		"genesis_hash",
--- a/config/config.go
+++ b/config/config.go
@@ -68,14 +68,17 @@ type Config struct {
 	BaseConfig `mapstructure:",squash"`

 	// Options for services
-	RPC             *RPCConfig             `mapstructure:"rpc"`
-	P2P             *P2PConfig             `mapstructure:"p2p"`
-	Mempool         *MempoolConfig         `mapstructure:"mempool"`
-	StateSync       *StateSyncConfig       `mapstructure:"statesync"`
-	FastSync        *FastSyncConfig        `mapstructure:"fastsync"`
-	Consensus       *ConsensusConfig       `mapstructure:"consensus"`
-	TxIndex         *TxIndexConfig         `mapstructure:"tx_index"`
-	Instrumentation *InstrumentationConfig `mapstructure:"instrumentation"`
+	RPC       *RPCConfig       `mapstructure:"rpc"`
+	P2P       *P2PConfig       `mapstructure:"p2p"`
+	Mempool   *MempoolConfig   `mapstructure:"mempool"`
+	StateSync *StateSyncConfig `mapstructure:"statesync"`
+	BlockSync *BlockSyncConfig `mapstructure:"blocksync"`
+	//TODO(williambanfield): remove this field once v0.37 is released.
+	// https://github.com/tendermint/tendermint/issues/9279
+	DeprecatedFastSyncConfig map[interface{}]interface{} `mapstructure:"fastsync"`
+	Consensus                *ConsensusConfig            `mapstructure:"consensus"`
+	TxIndex                  *TxIndexConfig              `mapstructure:"tx_index"`
+	Instrumentation          *InstrumentationConfig      `mapstructure:"instrumentation"`
 }

 // DefaultConfig returns a default configuration for a Tendermint node
@@ -86,7 +89,7 @@ func DefaultConfig() *Config {
 		P2P:             DefaultP2PConfig(),
 		Mempool:         DefaultMempoolConfig(),
 		StateSync:       DefaultStateSyncConfig(),
-		FastSync:        DefaultFastSyncConfig(),
+		BlockSync:       DefaultBlockSyncConfig(),
 		Consensus:       DefaultConsensusConfig(),
 		TxIndex:         DefaultTxIndexConfig(),
 		Instrumentation: DefaultInstrumentationConfig(),
@@ -101,7 +104,7 @@ func TestConfig() *Config {
 		P2P:             TestP2PConfig(),
 		Mempool:         TestMempoolConfig(),
 		StateSync:       TestStateSyncConfig(),
-		FastSync:        TestFastSyncConfig(),
+		BlockSync:       TestBlockSyncConfig(),
 		Consensus:       TestConsensusConfig(),
 		TxIndex:         TestTxIndexConfig(),
 		Instrumentation: TestInstrumentationConfig(),
@@ -136,8 +139,8 @@ func (cfg *Config) ValidateBasic() error {
 	if err := cfg.StateSync.ValidateBasic(); err != nil {
 		return fmt.Errorf("error in [statesync] section: %w", err)
 	}
-	if err := cfg.FastSync.ValidateBasic(); err != nil {
-		return fmt.Errorf("error in [fastsync] section: %w", err)
+	if err := cfg.BlockSync.ValidateBasic(); err != nil {
+		return fmt.Errorf("error in [blocksync] section: %w", err)
 	}
 	if err := cfg.Consensus.ValidateBasic(); err != nil {
 		return fmt.Errorf("error in [consensus] section: %w", err)
@@ -148,6 +151,17 @@ func (cfg *Config) ValidateBasic() error {
 	return nil
 }

+func (cfg *Config) CheckDeprecated() []string {
+	var warnings []string
+	if cfg.DeprecatedFastSyncConfig != nil {
+		warnings = append(warnings, "[fastsync] table detected. This section has been renamed to [blocksync]. The values in this deprecated section will be disregarded.")
+	}
+	if cfg.BaseConfig.DeprecatedFastSyncMode != nil {
+		warnings = append(warnings, "fast_sync key detected. This key has been renamed to block_sync. The value of this deprecated key will be disregarded.")
+	}
+	return warnings
+}
+
 //-----------------------------------------------------------------------------
 // BaseConfig

@@ -167,10 +181,14 @@ type BaseConfig struct { //nolint: maligned
 	// A custom human readable name for this node
 	Moniker string `mapstructure:"moniker"`

-	// If this node is many blocks behind the tip of the chain, FastSync
+	// If this node is many blocks behind the tip of the chain, Blocksync
 	// allows them to catchup quickly by downloading blocks in parallel
 	// and verifying their commits
-	FastSyncMode bool `mapstructure:"fast_sync"`
+	BlockSyncMode bool `mapstructure:"block_sync"`
+
+	//TODO(williambanfield): remove this field once v0.37 is released.
+	// https://github.com/tendermint/tendermint/issues/9279
+	DeprecatedFastSyncMode interface{} `mapstructure:"fast_sync"`

 	// Database backend: goleveldb | cleveldb | boltdb | rocksdb
 	// * goleveldb (github.com/syndtr/goleveldb - most popular implementation)
@@ -238,7 +256,7 @@ func DefaultBaseConfig() BaseConfig {
 		ABCI:               "socket",
 		LogLevel:           DefaultLogLevel,
 		LogFormat:          LogFormatPlain,
-		FastSyncMode:       true,
+		BlockSyncMode:      true,
 		FilterPeers:        false,
 		DBBackend:          "goleveldb",
 		DBPath:             "data",
@@ -250,7 +268,7 @@ func TestBaseConfig() BaseConfig {
 	cfg := DefaultBaseConfig()
 	cfg.chainID = "tendermint_test"
 	cfg.ProxyApp = "kvstore"
-	cfg.FastSyncMode = false
+	cfg.BlockSyncMode = false
 	cfg.DBBackend = "memdb"
 	return cfg
 }
@@ -817,7 +835,7 @@ func DefaultStateSyncConfig() *StateSyncConfig {
 	}
 }

-// TestFastSyncConfig returns a default configuration for the state sync service
+// TestStateSyncConfig returns a default configuration for the state sync service
 func TestStateSyncConfig() *StateSyncConfig {
 	return DefaultStateSyncConfig()
 }
@@ -873,34 +891,34 @@ func (cfg *StateSyncConfig) ValidateBasic() error {
 }

 //-----------------------------------------------------------------------------
-// FastSyncConfig
+// BlockSyncConfig

-// FastSyncConfig defines the configuration for the Tendermint fast sync service
-type FastSyncConfig struct {
+// BlockSyncConfig (formerly known as FastSync) defines the configuration for the Tendermint block sync service
+type BlockSyncConfig struct {
 	Version string `mapstructure:"version"`
 }

-// DefaultFastSyncConfig returns a default configuration for the fast sync service
-func DefaultFastSyncConfig() *FastSyncConfig {
-	return &FastSyncConfig{
+// DefaultBlockSyncConfig returns a default configuration for the block sync service
+func DefaultBlockSyncConfig() *BlockSyncConfig {
+	return &BlockSyncConfig{
 		Version: "v0",
 	}
 }

-// TestFastSyncConfig returns a default configuration for the fast sync.
-func TestFastSyncConfig() *FastSyncConfig {
-	return DefaultFastSyncConfig()
+// TestBlockSyncConfig returns a default configuration for the block sync.
+func TestBlockSyncConfig() *BlockSyncConfig {
+	return DefaultBlockSyncConfig()
 }

 // ValidateBasic performs basic validation.
-func (cfg *FastSyncConfig) ValidateBasic() error {
+func (cfg *BlockSyncConfig) ValidateBasic() error {
 	switch cfg.Version {
 	case "v0":
 		return nil
 	case "v1", "v2":
-		return fmt.Errorf("fast sync version %s has been deprecated. Please use v0 instead", cfg.Version)
+		return fmt.Errorf("blocksync version %s has been deprecated. Please use v0 instead", cfg.Version)
 	default:
-		return fmt.Errorf("unknown fastsync version %s", cfg.Version)
+		return fmt.Errorf("unknown blocksync version %s", cfg.Version)
 	}
 }

--- a/config/config_test.go
+++ b/config/config_test.go
@@ -128,8 +128,8 @@ func TestStateSyncConfigValidateBasic(t *testing.T) {
 	require.NoError(t, cfg.ValidateBasic())
 }

-func TestFastSyncConfigValidateBasic(t *testing.T) {
-	cfg := TestFastSyncConfig()
+func TestBlockSyncConfigValidateBasic(t *testing.T) {
+	cfg := TestBlockSyncConfig()
 	assert.NoError(t, cfg.ValidateBasic())

 	// tamper with version
--- a/config/toml.go
+++ b/config/toml.go
@@ -87,10 +87,10 @@ proxy_app = "{{ .BaseConfig.ProxyApp }}"
 # A custom human readable name for this node
 moniker = "{{ .BaseConfig.Moniker }}"

-# If this node is many blocks behind the tip of the chain, FastSync
+# If this node is many blocks behind the tip of the chain, BlockSync
 # allows them to catchup quickly by downloading blocks in parallel
 # and verifying their commits
-fast_sync = {{ .BaseConfig.FastSyncMode }}
+block_sync = {{ .BaseConfig.BlockSyncMode }}

 # Database backend: goleveldb | cleveldb | boltdb | rocksdb | badgerdb
 # * goleveldb (github.com/syndtr/goleveldb - most popular implementation)
@@ -429,17 +429,17 @@ chunk_request_timeout = "{{ .StateSync.ChunkRequestTimeout }}"
 chunk_fetchers = "{{ .StateSync.ChunkFetchers }}"

 #######################################################
-###       Fast Sync Configuration Connections       ###
+###       Block Sync Configuration Options          ###
 #######################################################
-[fastsync]
+[blocksync]

-# Fast Sync version to use:
+# Block Sync version to use:
 # 
-# In v0.37, v1 and v2 of the fast sync protocol were deprecated.
+# In v0.37, v1 and v2 of the block sync protocols were deprecated.
 # Please use v0 instead.
 #
-#   1) "v0" - the default fast sync implementation
-version = "{{ .FastSync.Version }}"
+#   1) "v0" - the default block sync implementation
+version = "{{ .BlockSync.Version }}"

 #######################################################
 ###         Consensus Configuration Options         ###
--- a/consensus/metrics.gen.go
+++ b/consensus/metrics.gen.go
@@ -118,11 +118,11 @@ func PrometheusMetrics(namespace string, labelsAndValues ...string) *Metrics {
 			Name:      "latest_block_height",
 			Help:      "The latest block height.",
 		}, labels).With(labelsAndValues...),
-		FastSyncing: prometheus.NewGaugeFrom(stdprometheus.GaugeOpts{
+		BlockSyncing: prometheus.NewGaugeFrom(stdprometheus.GaugeOpts{
 			Namespace: namespace,
 			Subsystem: MetricsSubsystem,
-			Name:      "fast_syncing",
-			Help:      "Whether or not a node is fast syncing. 1 if yes, 0 if no.",
+			Name:      "block_syncing",
+			Help:      "Whether or not a node is block syncing. 1 if yes, 0 if no.",
 		}, labels).With(labelsAndValues...),
 		StateSyncing: prometheus.NewGaugeFrom(stdprometheus.GaugeOpts{
 			Namespace: namespace,
@@ -184,7 +184,7 @@ func NopMetrics() *Metrics {
 		BlockSizeBytes:            discard.NewGauge(),
 		TotalTxs:                  discard.NewGauge(),
 		CommittedHeight:           discard.NewGauge(),
-		FastSyncing:               discard.NewGauge(),
+		BlockSyncing:              discard.NewGauge(),
 		StateSyncing:              discard.NewGauge(),
 		BlockParts:                discard.NewCounter(),
 		StepDurationSeconds:       discard.NewHistogram(),
--- a/consensus/metrics.go
+++ b/consensus/metrics.go
@@ -59,8 +59,8 @@ type Metrics struct {
 	TotalTxs metrics.Gauge
 	// The latest block height.
 	CommittedHeight metrics.Gauge `metrics_name:"latest_block_height"`
-	// Whether or not a node is fast syncing. 1 if yes, 0 if no.
-	FastSyncing metrics.Gauge
+	// Whether or not a node is block syncing. 1 if yes, 0 if no.
+	BlockSyncing metrics.Gauge
 	// Whether or not a node is state syncing. 1 if yes, 0 if no.
 	StateSyncing metrics.Gauge

--- a/consensus/reactor.go
+++ b/consensus/reactor.go
@@ -72,7 +72,7 @@ func NewReactor(consensusState *State, waitSync bool, options ...ReactorOption)
 }

 // OnStart implements BaseService by subscribing to events, which later will be
-// broadcasted to other peers and starting state if we're not in fast sync.
+// broadcasted to other peers and starting state if we're not in block sync.
 func (conR *Reactor) OnStart() error {
 	conR.Logger.Info("Reactor ", "waitSync", conR.WaitSync())

@@ -104,8 +104,8 @@ func (conR *Reactor) OnStop() {
 	}
 }

-// SwitchToConsensus switches from fast_sync mode to consensus mode.
-// It resets the state, turns off fast_sync, and starts the consensus state-machine
+// SwitchToConsensus switches from block_sync mode to consensus mode.
+// It resets the state, turns off block_sync, and starts the consensus state-machine
 func (conR *Reactor) SwitchToConsensus(state sm.State, skipWAL bool) {
 	conR.Logger.Info("SwitchToConsensus")

@@ -121,7 +121,7 @@ func (conR *Reactor) SwitchToConsensus(state sm.State, skipWAL bool) {
 	conR.mtx.Lock()
 	conR.waitSync = false
 	conR.mtx.Unlock()
-	conR.Metrics.FastSyncing.Set(0)
+	conR.Metrics.BlockSyncing.Set(0)
 	conR.Metrics.StateSyncing.Set(0)

 	if skipWAL {
@@ -198,7 +198,7 @@ func (conR *Reactor) AddPeer(peer p2p.Peer) {
 	go conR.queryMaj23Routine(peer, peerState)

 	// Send our state to peer.
-	// If we're fast_syncing, broadcast a RoundStepMessage later upon SwitchToConsensus().
+	// If we're block_syncing, broadcast a RoundStepMessage later upon SwitchToConsensus().
 	if !conR.WaitSync() {
 		conR.sendNewRoundStepMessage(peer)
 	}
@@ -218,7 +218,7 @@ func (conR *Reactor) RemovePeer(peer p2p.Peer, reason interface{}) {
 }

 // Receive implements Reactor
-// NOTE: We process these messages even when we're fast_syncing.
+// NOTE: We process these messages even when we're block_syncing.
 // Messages affect either a peer state or the consensus state.
 // Peer state updates can happen in parallel, but processing of
 // proposals, block parts, and votes are ordered by the receiveRoutine
@@ -386,7 +386,7 @@ func (conR *Reactor) SetEventBus(b *types.EventBus) {
 	conR.conS.SetEventBus(b)
 }

-// WaitSync returns whether the consensus reactor is waiting for state/fast sync.
+// WaitSync returns whether the consensus reactor is waiting for state/block sync.
 func (conR *Reactor) WaitSync() bool {
 	conR.mtx.RLock()
 	defer conR.mtx.RUnlock()
--- a/docs/tendermint-core/README.md
+++ b/docs/tendermint-core/README.md
@@ -17,7 +17,7 @@ This section dives into the internals of Tendermint the implementation.
 - [Subscribing to events](./subscription.md)
 - [Block Structure](./block-structure.md)
 - [RPC](./rpc.md)
- [Fast Sync](./fast-sync.md)
+- [Block Sync](./block-sync.md)
 - [State Sync](./state-sync.md)
 - [Mempool](./mempool.md)
 - [Light Client](./light-client.md)
--- a/docs/tendermint-core/block-sync.md
+++ b/docs/tendermint-core/block-sync.md
@@ -2,7 +2,8 @@
 order: 10
 ---

-# Fast Sync
+# Block Sync
+*Formerly known as Fast Sync*

 In a proof of work blockchain, syncing with the chain is the same
 process as staying up-to-date with the consensus: download blocks, and
@@ -14,35 +15,37 @@ scratch can take a very long time. It's much faster to just download
 blocks and check the merkle tree of validators than to run the real-time
 consensus gossip protocol.

-## Using Fast Sync
+## Using Block Sync

-To support faster syncing, Tendermint offers a `fast-sync` mode, which
+To support faster syncing, Tendermint offers a `block-sync` mode, which
 is enabled by default, and can be toggled in the `config.toml` or via
-`--fast_sync=false`.
+`--block_sync=false`.

 In this mode, the Tendermint daemon will sync hundreds of times faster
 than if it used the real-time consensus process. Once caught up, the
-daemon will switch out of fast sync and into the normal consensus mode.
+daemon will switch out of Block Sync and into the normal consensus mode.
 After running for some time, the node is considered `caught up` if it
 has at least one peer and it's height is at least as high as the max
 reported peer height. See [the IsCaughtUp
 method](https://github.com/tendermint/tendermint/blob/b467515719e686e4678e6da4e102f32a491b85a0/blockchain/pool.go#L128).

-Note: There are three versions of fast sync. We recommend using v0 as v1 and v2 are still in beta. 
-  If you would like to use a different version you can do so by changing the version in the `config.toml`:
+Note: While there have historically been multiple versions of blocksync, v0, v1, and v2, all versions
+other than v0 have been deprecated in favor of the simplest and most well understood algorithm.

 ```toml
 #######################################################
-###       Fast Sync Configuration Connections       ###
+###       Block Sync Configuration Options          ###
 #######################################################
-[fastsync]
+[blocksync]

-# Fast Sync version to use:
-#   1) "v0" (default) - the legacy fast sync implementation
-#   2) "v1" - refactor of v0 version for better testability
-#   2) "v2" - complete redesign of v0, optimized for testability & readability 
+# Block Sync version to use:
+# 
+# In v0.37, v1 and v2 of the block sync protocols were deprecated.
+# Please use v0 instead.
+#
+#   1) "v0" - the default block sync implementation
 version = "v0"
 ```

-If we're lagging sufficiently, we should go back to fast syncing, but
+If we're lagging sufficiently, we should go back to block syncing, but
 this is an [open issue](https://github.com/tendermint/tendermint/issues/129).
--- a/docs/tendermint-core/configuration.md
+++ b/docs/tendermint-core/configuration.md
@@ -36,10 +36,10 @@ proxy_app = "tcp://127.0.0.1:26658"
 # A custom human readable name for this node
 moniker = "anonymous"

-# If this node is many blocks behind the tip of the chain, FastSync
+# If this node is many blocks behind the tip of the chain, BlockSync
 # allows them to catchup quickly by downloading blocks in parallel
 # and verifying their commits
-fast_sync = true
+block_sync = true

 # Database backend: goleveldb | cleveldb | boltdb | rocksdb | badgerdb
 # * goleveldb (github.com/syndtr/goleveldb - most popular implementation)
@@ -319,16 +319,16 @@ trust_period = "0s"
 temp_dir = ""

 #######################################################
-###       Fast Sync Configuration Connections       ###
+###       Block Sync Configuration Options          ###
 #######################################################
-[fastsync]
+[blocksync]

-# Fast Sync version to use:
-#
-# In v0.37, the v1 and v2 fast sync protocols were deprecated.
+# Block Sync version to use:
+# 
+# In v0.37, v1 and v2 of the block sync protocols were deprecated.
 # Please use v0 instead.
 #
-#   1) "v0" (default) - the legacy fast sync implementation
+#   1) "v0" - the default block sync implementation
 version = "v0"

 #######################################################
--- a/docs/tendermint-core/metrics.md
+++ b/docs/tendermint-core/metrics.md
@@ -37,7 +37,7 @@ The following metrics are available:
 | consensus_total_txs                    | Gauge     |                 | Total number of transactions committed                                                                                                     |
 | consensus_block_parts                  | counter   | peer_id         | number of blockparts transmitted by peer                                                                                                   |
 | consensus_latest_block_height          | gauge     |                 | /status sync_info number                                                                                                                   |
-| consensus_fast_syncing                 | gauge     |                 | either 0 (not fast syncing) or 1 (syncing)                                                                                                 |
+| consensus_block_syncing                | gauge     |                 | either 0 (not block syncing) or 1 (syncing)                                                                                                 |
 | consensus_state_syncing                | gauge     |                 | either 0 (not state syncing) or 1 (syncing)                                                                                                |
 | consensus_block_size_bytes             | Gauge     |                 | Block size in bytes                                                                                                                        |
 | consensus_step_duration                | Histogram | step            | Histogram of durations for each step in the consensus protocol                                                                             |
--- a/docs/tendermint-core/state-sync.md
+++ b/docs/tendermint-core/state-sync.md
@@ -4,7 +4,7 @@ order: 11

 # State Sync

-With fast sync a node is downloading all of the data of an application from genesis and verifying it. 
+With block sync a node is downloading all of the data of an application from genesis and verifying it. 
 With state sync your node will download data related to the head or near the head of the chain and verify the data. 
 This leads to drastically shorter times for joining a network. 

--- a/node/node.go
+++ b/node/node.go
@@ -16,7 +16,7 @@ import (
 	dbm "github.com/tendermint/tm-db"

 	abci "github.com/tendermint/tendermint/abci/types"
-	bc "github.com/tendermint/tendermint/blockchain"
+	bc "github.com/tendermint/tendermint/blocksync"
 	cfg "github.com/tendermint/tendermint/config"
 	cs "github.com/tendermint/tendermint/consensus"
 	"github.com/tendermint/tendermint/crypto"
@@ -133,10 +133,10 @@ func DefaultMetricsProvider(config *cfg.InstrumentationConfig) MetricsProvider {
 // Option sets a parameter for the node.
 type Option func(*Node)

-// Temporary interface for switching to fast sync, we should get rid of v0 and v1 reactors.
+// Temporary interface for switching to block sync, we should get rid of v0 and v1 reactors.
 // See: https://github.com/tendermint/tendermint/issues/4595
-type fastSyncReactor interface {
-	SwitchToFastSync(sm.State) error
+type blockSyncReactor interface {
+	SwitchToBlockSync(sm.State) error
 }

 // CustomReactors allows you to add custom reactors (name -> p2p.Reactor) to
@@ -212,7 +212,7 @@ type Node struct {
 	eventBus          *types.EventBus // pub/sub for services
 	stateStore        sm.Store
 	blockStore        *store.BlockStore // store the blockchain to disk
-	bcReactor         p2p.Reactor       // for fast-syncing
+	bcReactor         p2p.Reactor       // for block-syncing
 	mempoolReactor    p2p.Reactor       // for gossipping transactions
 	mempool           mempl.Mempool
 	stateSync         bool                    // whether the node should state sync on startup
@@ -443,16 +443,16 @@ func createBlockchainReactor(config *cfg.Config,
 	state sm.State,
 	blockExec *sm.BlockExecutor,
 	blockStore *store.BlockStore,
-	fastSync bool,
+	blockSync bool,
 	logger log.Logger) (bcReactor p2p.Reactor, err error) {

-	switch config.FastSync.Version {
+	switch config.BlockSync.Version {
 	case "v0":
-		bcReactor = bc.NewReactor(state.Copy(), blockExec, blockStore, fastSync)
+		bcReactor = bc.NewReactor(state.Copy(), blockExec, blockStore, blockSync)
 	case "v1", "v2":
-		return nil, fmt.Errorf("fast sync version %s has been deprecated. Please use v0", config.FastSync.Version)
+		return nil, fmt.Errorf("block sync version %s has been deprecated. Please use v0", config.BlockSync.Version)
 	default:
-		return nil, fmt.Errorf("unknown fastsync version %s", config.FastSync.Version)
+		return nil, fmt.Errorf("unknown fastsync version %s", config.BlockSync.Version)
 	}

 	bcReactor.SetLogger(logger.With("module", "blockchain"))
@@ -642,9 +642,9 @@ func createPEXReactorAndAddToSwitch(addrBook pex.AddrBook, config *cfg.Config,
 	return pexReactor
 }

-// startStateSync starts an asynchronous state sync process, then switches to fast sync mode.
-func startStateSync(ssR *statesync.Reactor, bcR fastSyncReactor, conR *cs.Reactor,
-	stateProvider statesync.StateProvider, config *cfg.StateSyncConfig, fastSync bool,
+// startStateSync starts an asynchronous state sync process, then switches to block sync mode.
+func startStateSync(ssR *statesync.Reactor, bcR blockSyncReactor, conR *cs.Reactor,
+	stateProvider statesync.StateProvider, config *cfg.StateSyncConfig, blockSync bool,
 	stateStore sm.Store, blockStore *store.BlockStore, state sm.State) error {
 	ssR.Logger.Info("Starting state sync")

@@ -682,13 +682,13 @@ func startStateSync(ssR *statesync.Reactor, bcR fastSyncReactor, conR *cs.Reacto
 			return
 		}

-		if fastSync {
+		if blockSync {
 			// FIXME Very ugly to have these metrics bleed through here.
 			conR.Metrics.StateSyncing.Set(0)
-			conR.Metrics.FastSyncing.Set(1)
-			err = bcR.SwitchToFastSync(state)
+			conR.Metrics.BlockSyncing.Set(1)
+			err = bcR.SwitchToBlockSync(state)
 			if err != nil {
-				ssR.Logger.Error("Failed to switch to fast sync", "err", err)
+				ssR.Logger.Error("Failed to switch to block sync", "err", err)
 				return
 			}
 		} else {
@@ -783,9 +783,9 @@ func NewNode(config *cfg.Config,
 		}
 	}

-	// Determine whether we should do fast sync. This must happen after the handshake, since the
+	// Determine whether we should do block sync. This must happen after the handshake, since the
 	// app may modify the validator set, specifying ourself as the only validator.
-	fastSync := config.FastSyncMode && !onlyValidatorIsUs(state, pubKey)
+	blockSync := config.BlockSyncMode && !onlyValidatorIsUs(state, pubKey)

 	logNodeStartupInfo(state, pubKey, logger, consensusLogger)

@@ -808,26 +808,26 @@ func NewNode(config *cfg.Config,
 		sm.BlockExecutorWithMetrics(smMetrics),
 	)

-	// Make BlockchainReactor. Don't start fast sync if we're doing a state sync first.
-	bcReactor, err := createBlockchainReactor(config, state, blockExec, blockStore, fastSync && !stateSync, logger)
+	// Make BlockchainReactor. Don't start block sync if we're doing a state sync first.
+	bcReactor, err := createBlockchainReactor(config, state, blockExec, blockStore, blockSync && !stateSync, logger)
 	if err != nil {
 		return nil, fmt.Errorf("could not create blockchain reactor: %w", err)
 	}

-	// Make ConsensusReactor. Don't enable fully if doing a state sync and/or fast sync first.
+	// Make ConsensusReactor. Don't enable fully if doing a state sync and/or block sync first.
 	// FIXME We need to update metrics here, since other reactors don't have access to them.
 	if stateSync {
 		csMetrics.StateSyncing.Set(1)
-	} else if fastSync {
-		csMetrics.FastSyncing.Set(1)
+	} else if blockSync {
+		csMetrics.BlockSyncing.Set(1)
 	}
 	consensusReactor, consensusState := createConsensusReactor(
 		config, state, blockExec, blockStore, mempool, evidencePool,
-		privValidator, csMetrics, stateSync || fastSync, eventBus, consensusLogger,
+		privValidator, csMetrics, stateSync || blockSync, eventBus, consensusLogger,
 	)

 	// Set up state sync reactor, and schedule a sync if requested.
-	// FIXME The way we do phased startups (e.g. replay -> fast sync -> consensus) is very messy,
+	// FIXME The way we do phased startups (e.g. replay -> block sync -> consensus) is very messy,
 	// we should clean this whole thing up. See:
 	// https://github.com/tendermint/tendermint/issues/4644
 	stateSyncReactor := statesync.NewReactor(
@@ -982,12 +982,12 @@ func (n *Node) OnStart() error {

 	// Run state sync
 	if n.stateSync {
-		bcR, ok := n.bcReactor.(fastSyncReactor)
+		bcR, ok := n.bcReactor.(blockSyncReactor)
 		if !ok {
 			return fmt.Errorf("this blockchain reactor does not support switching from state sync")
 		}
 		err := startStateSync(n.stateSyncReactor, bcR, n.consensusReactor, n.stateSyncProvider,
-			n.config.StateSync, n.config.FastSyncMode, n.stateStore, n.blockStore, n.stateSyncGenesis)
+			n.config.StateSync, n.config.BlockSyncMode, n.stateStore, n.blockStore, n.stateSyncGenesis)
 		if err != nil {
 			return fmt.Errorf("failed to start state sync: %w", err)
 		}
@@ -1335,7 +1335,7 @@ func makeNodeInfo(
 		Network:       genDoc.ChainID,
 		Version:       version.TMCoreSemVer,
 		Channels: []byte{
-			bc.BlockchainChannel,
+			bc.BlocksyncChannel,
 			cs.StateChannel, cs.DataChannel, cs.VoteChannel, cs.VoteSetBitsChannel,
 			mempl.MempoolChannel,
 			evidence.EvidenceChannel,
--- a/proto/tendermint/blockchain/types.pb.go
+++ b/proto/tendermint/blockchain/types.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-gogo. DO NOT EDIT.
-// source: tendermint/blockchain/types.proto
+// source: tendermint/blocksync/types.proto

-package blockchain
+package blocksync

 import (
 	fmt "fmt"
@@ -32,7 +32,7 @@ func (m *BlockRequest) Reset()         { *m = BlockRequest{} }
 func (m *BlockRequest) String() string { return proto.CompactTextString(m) }
 func (*BlockRequest) ProtoMessage()    {}
 func (*BlockRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_2927480384e78499, []int{0}
+	return fileDescriptor_19b397c236e0fa07, []int{0}
 }
 func (m *BlockRequest) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -77,7 +77,7 @@ func (m *NoBlockResponse) Reset()         { *m = NoBlockResponse{} }
 func (m *NoBlockResponse) String() string { return proto.CompactTextString(m) }
 func (*NoBlockResponse) ProtoMessage()    {}
 func (*NoBlockResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_2927480384e78499, []int{1}
+	return fileDescriptor_19b397c236e0fa07, []int{1}
 }
 func (m *NoBlockResponse) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -122,7 +122,7 @@ func (m *BlockResponse) Reset()         { *m = BlockResponse{} }
 func (m *BlockResponse) String() string { return proto.CompactTextString(m) }
 func (*BlockResponse) ProtoMessage()    {}
 func (*BlockResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_2927480384e78499, []int{2}
+	return fileDescriptor_19b397c236e0fa07, []int{2}
 }
 func (m *BlockResponse) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -166,7 +166,7 @@ func (m *StatusRequest) Reset()         { *m = StatusRequest{} }
 func (m *StatusRequest) String() string { return proto.CompactTextString(m) }
 func (*StatusRequest) ProtoMessage()    {}
 func (*StatusRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_2927480384e78499, []int{3}
+	return fileDescriptor_19b397c236e0fa07, []int{3}
 }
 func (m *StatusRequest) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -205,7 +205,7 @@ func (m *StatusResponse) Reset()         { *m = StatusResponse{} }
 func (m *StatusResponse) String() string { return proto.CompactTextString(m) }
 func (*StatusResponse) ProtoMessage()    {}
 func (*StatusResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_2927480384e78499, []int{4}
+	return fileDescriptor_19b397c236e0fa07, []int{4}
 }
 func (m *StatusResponse) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -262,7 +262,7 @@ func (m *Message) Reset()         { *m = Message{} }
 func (m *Message) String() string { return proto.CompactTextString(m) }
 func (*Message) ProtoMessage()    {}
 func (*Message) Descriptor() ([]byte, []int) {
-	return fileDescriptor_2927480384e78499, []int{5}
+	return fileDescriptor_19b397c236e0fa07, []int{5}
 }
 func (m *Message) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -373,42 +373,41 @@ func (*Message) XXX_OneofWrappers() []interface{} {
 }

 func init() {
-	proto.RegisterType((*BlockRequest)(nil), "tendermint.blockchain.BlockRequest")
-	proto.RegisterType((*NoBlockResponse)(nil), "tendermint.blockchain.NoBlockResponse")
-	proto.RegisterType((*BlockResponse)(nil), "tendermint.blockchain.BlockResponse")
-	proto.RegisterType((*StatusRequest)(nil), "tendermint.blockchain.StatusRequest")
-	proto.RegisterType((*StatusResponse)(nil), "tendermint.blockchain.StatusResponse")
-	proto.RegisterType((*Message)(nil), "tendermint.blockchain.Message")
+	proto.RegisterType((*BlockRequest)(nil), "tendermint.blocksync.BlockRequest")
+	proto.RegisterType((*NoBlockResponse)(nil), "tendermint.blocksync.NoBlockResponse")
+	proto.RegisterType((*BlockResponse)(nil), "tendermint.blocksync.BlockResponse")
+	proto.RegisterType((*StatusRequest)(nil), "tendermint.blocksync.StatusRequest")
+	proto.RegisterType((*StatusResponse)(nil), "tendermint.blocksync.StatusResponse")
+	proto.RegisterType((*Message)(nil), "tendermint.blocksync.Message")
 }

-func init() { proto.RegisterFile("tendermint/blockchain/types.proto", fileDescriptor_2927480384e78499) }
+func init() { proto.RegisterFile("tendermint/blocksync/types.proto", fileDescriptor_19b397c236e0fa07) }

-var fileDescriptor_2927480384e78499 = []byte{
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-	0x00, 0x00,
+var fileDescriptor_19b397c236e0fa07 = []byte{
+	// 368 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x7c, 0x93, 0x4d, 0x4f, 0xfa, 0x40,
+	0x10, 0xc6, 0xdb, 0x7f, 0x81, 0x7f, 0x32, 0x50, 0x1a, 0x1b, 0xa3, 0xc4, 0x98, 0x86, 0xd4, 0x97,
+	0xe8, 0xc1, 0x36, 0xc1, 0xa3, 0xc6, 0x03, 0x27, 0x4c, 0x7c, 0x49, 0x4a, 0xbc, 0x78, 0x21, 0x14,
+	0x37, 0x40, 0x94, 0x2e, 0x32, 0xdb, 0x03, 0xdf, 0xc2, 0x2f, 0xe0, 0xf7, 0xf1, 0xc8, 0xd1, 0xa3,
+	0x81, 0x2f, 0x62, 0x98, 0x2d, 0x65, 0x69, 0xb0, 0xb7, 0xdd, 0xe9, 0x33, 0xbf, 0x79, 0xfa, 0x64,
+	0x16, 0xea, 0x82, 0x45, 0x2f, 0x6c, 0x32, 0x1a, 0x46, 0xc2, 0x0f, 0xdf, 0x78, 0xef, 0x15, 0xa7,
+	0x51, 0xcf, 0x17, 0xd3, 0x31, 0x43, 0x6f, 0x3c, 0xe1, 0x82, 0xdb, 0xbb, 0x6b, 0x85, 0x97, 0x2a,
+	0x0e, 0x0e, 0x95, 0x3e, 0x52, 0xcb, 0x6e, 0xd9, 0xe3, 0x9e, 0x42, 0xa5, 0xb9, 0xbc, 0x06, 0xec,
+	0x3d, 0x66, 0x28, 0xec, 0x3d, 0x28, 0x0d, 0xd8, 0xb0, 0x3f, 0x10, 0x35, 0xbd, 0xae, 0x9f, 0x19,
+	0x41, 0x72, 0x73, 0xcf, 0xc1, 0x7a, 0xe0, 0x89, 0x12, 0xc7, 0x3c, 0x42, 0xf6, 0xa7, 0xf4, 0x06,
+	0xcc, 0x4d, 0xe1, 0x05, 0x14, 0x69, 0x24, 0xe9, 0xca, 0x8d, 0x7d, 0x4f, 0xf1, 0x29, 0xfd, 0x4b,
+	0xbd, 0x54, 0xb9, 0x16, 0x98, 0x6d, 0xd1, 0x15, 0x31, 0x26, 0x9e, 0xdc, 0x6b, 0xa8, 0xae, 0x0a,
+	0xf9, 0xa3, 0x6d, 0x1b, 0x0a, 0x61, 0x17, 0x59, 0xed, 0x1f, 0x55, 0xe9, 0xec, 0x7e, 0x1a, 0xf0,
+	0xff, 0x9e, 0x21, 0x76, 0xfb, 0xcc, 0xbe, 0x05, 0x93, 0x66, 0x74, 0x26, 0x12, 0x9d, 0x38, 0x72,
+	0xbd, 0x6d, 0xc9, 0x79, 0x6a, 0x30, 0x2d, 0x2d, 0xa8, 0x84, 0x6a, 0x50, 0x6d, 0xd8, 0x89, 0x78,
+	0x67, 0x45, 0x93, 0xbe, 0x68, 0x6e, 0xb9, 0x71, 0xb2, 0x1d, 0x97, 0xc9, 0xaf, 0xa5, 0x05, 0x56,
+	0x94, 0x89, 0xf4, 0x0e, 0xaa, 0x19, 0xa2, 0x41, 0xc4, 0xa3, 0x5c, 0x83, 0x29, 0xcf, 0x0c, 0xb3,
+	0x34, 0xa4, 0xdc, 0xd2, 0xdf, 0x2d, 0xe4, 0xd1, 0x36, 0x42, 0x5f, 0xd2, 0x50, 0x2d, 0xd8, 0x8f,
+	0x60, 0xa5, 0xb4, 0xc4, 0x5c, 0x91, 0x70, 0xc7, 0xf9, 0xb8, 0xd4, 0x5d, 0x15, 0x37, 0x2a, 0xcd,
+	0x22, 0x18, 0x18, 0x8f, 0x9a, 0x4f, 0x5f, 0x73, 0x47, 0x9f, 0xcd, 0x1d, 0xfd, 0x67, 0xee, 0xe8,
+	0x1f, 0x0b, 0x47, 0x9b, 0x2d, 0x1c, 0xed, 0x7b, 0xe1, 0x68, 0xcf, 0x57, 0xfd, 0xa1, 0x18, 0xc4,
+	0xa1, 0xd7, 0xe3, 0x23, 0x5f, 0x5d, 0xe2, 0xf5, 0x91, 0x76, 0xd8, 0xdf, 0xf6, 0x30, 0xc2, 0x12,
+	0x7d, 0xbb, 0xfc, 0x0d, 0x00, 0x00, 0xff, 0xff, 0xf5, 0x1c, 0xa3, 0x45, 0x37, 0x03, 0x00, 0x00,
 }

 func (m *BlockRequest) Marshal() (dAtA []byte, err error) {
--- a/proto/tendermint/blockchain/types.proto
+++ b/proto/tendermint/blockchain/types.proto
@@ -1,7 +1,7 @@
 syntax = "proto3";
-package tendermint.blockchain;
+package tendermint.blocksync;

-option go_package = "github.com/tendermint/tendermint/proto/tendermint/blockchain";
+option go_package = "github.com/tendermint/tendermint/proto/tendermint/blocksync";

 import "tendermint/types/block.proto";

--- a/spec/abci/abci.md
+++ b/spec/abci/abci.md
@@ -643,7 +643,7 @@ the blockchain's `AppHash` which is verified via [light client verification](../
    `Snapshot.Metadata` and/or incrementally verifying contents against `AppHash`.
    * When all chunks have been accepted, Tendermint will make an ABCI `Info` call to verify that
    `LastBlockAppHash` and `LastBlockHeight` matches the expected values, and record the
-    `AppVersion` in the node state. It then switches to fast sync or consensus and joins the
+    `AppVersion` in the node state. It then switches to block sync or consensus and joins the
    network.
    * If Tendermint is unable to retrieve the next chunk after some time (e.g. because no suitable
    peers are available), it will reject the snapshot and try a different one via `OfferSnapshot`.
--- a/spec/p2p/messages/block-sync.md
+++ b/spec/p2p/messages/block-sync.md
@@ -10,7 +10,7 @@ Block sync has one channel.

 | Name              | Number |
 |-------------------|--------|
-| BlockchainChannel | 64     |
+| BlocksyncChannel | 64     |

 ## Message Types

--- a/test/e2e/README.md
+++ b/test/e2e/README.md
@@ -160,4 +160,4 @@ tendermint start
 ./build/node ./node.socket.toml
 ```

-Check `node/config.go` to see how the settings of the test application can be tweaked.
+Check `node/config.go` to see how the settings of the test application can be tweaked.
--- a/test/e2e/generator/generate.go
+++ b/test/e2e/generator/generate.go
@@ -28,7 +28,7 @@ var (
 	// FIXME: grpc disabled due to https://github.com/tendermint/tendermint/issues/5439
 	nodeABCIProtocols     = uniformChoice{"unix", "tcp", "builtin"} // "grpc"
 	nodePrivvalProtocols  = uniformChoice{"file", "unix", "tcp"}
-	nodeFastSyncs         = uniformChoice{false, true}
+	nodeBlockSyncs        = uniformChoice{"v0"} // "v2"
 	nodeStateSyncs        = uniformChoice{false, true}
 	nodeMempools          = uniformChoice{"v0", "v1"}
 	nodePersistIntervals  = uniformChoice{0, 1, 5}
@@ -201,7 +201,7 @@ func generateNode(
 		StartAt:          startAt,
 		Database:         nodeDatabases.Choose(r).(string),
 		PrivvalProtocol:  nodePrivvalProtocols.Choose(r).(string),
-		FastSync:         nodeFastSyncs.Choose(r).(bool),
+		BlockSync:        nodeBlockSyncs.Choose(r).(string),
 		Mempool:          nodeMempools.Choose(r).(string),
 		StateSync:        nodeStateSyncs.Choose(r).(bool) && startAt > 0,
 		PersistInterval:  ptrUint64(uint64(nodePersistIntervals.Choose(r).(int))),
--- a/test/e2e/networks/ci.toml
+++ b/test/e2e/networks/ci.toml
@@ -63,10 +63,10 @@ abci_protocol = "builtin"
 perturb = ["pause"]

 [node.validator05]
+block_sync = "v0" 
 start_at = 1005 # Becomes part of the validator set at 1010
 seeds = ["seed02"]
 database = "cleveldb"
-fast_sync = true
 mempool_version = "v1"
 # FIXME: should be grpc, disabled due to https://github.com/tendermint/tendermint/issues/5439
 #abci_protocol = "grpc"
@@ -76,7 +76,7 @@ perturb = ["kill", "pause", "disconnect", "restart"]
 [node.full01]
 start_at = 1010
 mode = "full"
-fast_sync = true
+block_sync = "v0"
 persistent_peers = ["validator01", "validator02", "validator03", "validator04", "validator05"]
 retain_blocks = 1
 perturb = ["restart"]
@@ -84,7 +84,7 @@ perturb = ["restart"]
 [node.full02]
 start_at = 1015
 mode = "full"
-fast_sync = true
+block_sync = "v0"
 state_sync = true
 seeds = ["seed01"]
 perturb = ["restart"]
@@ -97,4 +97,4 @@ persistent_peers = ["validator01", "validator02", "validator03"]
 [node.light02]
 mode= "light"
 start_at= 1015
-persistent_peers = ["validator04", "full01", "validator05"]
+persistent_peers = ["validator04", "full01", "validator05"]
--- a/test/e2e/pkg/manifest.go
+++ b/test/e2e/pkg/manifest.go
@@ -88,8 +88,9 @@ type ManifestNode struct {
 	// runner will wait for the network to reach at least this block height.
 	StartAt int64 `toml:"start_at"`

-	// FastSync specifies whether to enable the fast sync protocol.
-	FastSync bool `toml:"fast_sync"`
+	// BlockSync specifies the block sync mode: "" (disable), "v0" or "v2".
+	// Defaults to disabled.
+	BlockSync string `toml:"block_sync"`

 	// Mempool specifies which version of mempool to use. Either "v0" or "v1"
 	// This defaults to v0.
--- a/test/e2e/pkg/testnet.go
+++ b/test/e2e/pkg/testnet.go
@@ -72,7 +72,7 @@ type Node struct {
 	IP               net.IP
 	ProxyPort        uint32
 	StartAt          int64
-	FastSync         bool
+	BlockSync        string
 	StateSync        bool
 	Mempool          string
 	Database         string
@@ -155,7 +155,7 @@ func LoadTestnet(file string) (*Testnet, error) {
 			ABCIProtocol:     Protocol(testnet.ABCIProtocol),
 			PrivvalProtocol:  ProtocolFile,
 			StartAt:          nodeManifest.StartAt,
-			FastSync:         nodeManifest.FastSync,
+			BlockSync:        nodeManifest.BlockSync,
 			Mempool:          nodeManifest.Mempool,
 			StateSync:        nodeManifest.StateSync,
 			PersistInterval:  1,
@@ -297,6 +297,11 @@ func (n Node) Validate(testnet Testnet) error {
 			}
 		}
 	}
+	switch n.BlockSync {
+	case "", "v0":
+	default:
+		return fmt.Errorf("invalid block sync setting %q", n.BlockSync)
+	}
 	switch n.Mempool {
 	case "", "v0", "v1":
 	default:
--- a/test/e2e/runner/setup.go
+++ b/test/e2e/runner/setup.go
@@ -284,7 +284,11 @@ func MakeConfig(node *e2e.Node) (*config.Config, error) {
 		cfg.Mempool.Version = node.Mempool
 	}

-	cfg.FastSyncMode = node.FastSync
+	if node.BlockSync == "" {
+		cfg.BlockSyncMode = false
+	} else {
+		cfg.BlockSync.Version = node.BlockSync
+	}

 	if node.StateSync {
 		cfg.StateSync.Enable = true