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chore: rename 'heartbeat timeout' to 'heartbeat interval'

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Heartbeat timeout means the period length that indicates heartbeat is
out of service, which is different from heartbeat interval.

So we should use '-peer-heartbeat-interval' instead of
'-peer-heartbeat-timeout' in etcd.

'-peer-heartbeat-timeout' is deprecated but still could be used.
This commit is contained in:
Yicheng Qin 2014-02-16 20:19:31 -08:00
parent a72f913a60
commit f434177a9a
6 changed files with 63 additions and 61 deletions
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30
Documentation/tuning.md
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@ -1,46 +1,46 @@
## Tuning ## Tuning
The default settings in etcd should work well for installations on a local network where the average network latency is low. The default settings in etcd should work well for installations on a local network where the average network latency is low.
However, when using etcd across multiple data centers or over networks with high latency you may need to tweak the heartbeat and election timeout settings. However, when using etcd across multiple data centers or over networks with high latency you may need to tweak the heartbeat interval and election timeout settings.
### Timeouts ### Time Parameters
The underlying distributed consensus protocol relies on two separate timeouts to ensure that nodes can handoff leadership if one stalls or goes offline. The underlying distributed consensus protocol relies on two separate time parameters to ensure that nodes can handoff leadership if one stalls or goes offline.
The first timeout is called the *Heartbeat Timeout*. The first parameter is called the *Heartbeat Interval*.
This is the frequency with which the leader will notify followers that it is still the leader. This is the frequency with which the leader will notify followers that it is still the leader.
etcd batches commands together for higher throughput so this heartbeat timeout is also a delay for how long it takes for commands to be committed. etcd batches commands together for higher throughput so this heartbeat interval is also a delay for how long it takes for commands to be committed.
By default, etcd uses a `50ms` heartbeat timeout. By default, etcd uses a `50ms` heartbeat interval.
The second timeout is the *Election Timeout*. The second parameter is the *Election Timeout*.
This timeout is how long a follower node will go without hearing a heartbeat before attempting to become leader itself. This timeout is how long a follower node will go without hearing a heartbeat before attempting to become leader itself.
By default, etcd uses a `200ms` election timeout. By default, etcd uses a `200ms` election timeout.
Adjusting these values is a trade off. Adjusting these values is a trade off.
Lowering the heartbeat timeout will cause individual commands to be committed faster but it will lower the overall throughput of etcd. Lowering the heartbeat interval will cause individual commands to be committed faster but it will lower the overall throughput of etcd.
If your etcd instances have low utilization then lowering the heartbeat timeout can improve your command response time. If your etcd instances have low utilization then lowering the heartbeat interval can improve your command response time.
The election timeout should be set based on the heartbeat timeout and your network ping time between nodes. The election timeout should be set based on the heartbeat interval and your network ping time between nodes.
Election timeouts should be at least 10 times your ping time so it can account for variance in your network. Election timeouts should be at least 10 times your ping time so it can account for variance in your network.
For example, if the ping time between your nodes is 10ms then you should have at least a 100ms election timeout. For example, if the ping time between your nodes is 10ms then you should have at least a 100ms election timeout.
You should also set your election timeout to at least 4 to 5 times your heartbeat timeout to account for variance in leader replication. You should also set your election timeout to at least 4 to 5 times your heartbeat interval to account for variance in leader replication.
For a heartbeat timeout of 50ms you should set your election timeout to at least 200ms - 250ms. For a heartbeat interval of 50ms you should set your election timeout to at least 200ms - 250ms.
You can override the default values on the command line: You can override the default values on the command line:
```sh ```sh
# Command line arguments: # Command line arguments:
$ etcd -peer-heartbeat-timeout=100 -peer-election-timeout=500 $ etcd -peer-heartbeat-interval=100 -peer-election-timeout=500
# Environment variables: # Environment variables:
$ ETCD_PEER_HEARTBEAT_TIMEOUT=100 ETCD_PEER_ELECTION_TIMEOUT=500 etcd $ ETCD_PEER_HEARTBEAT_INTERVAL=100 ETCD_PEER_ELECTION_TIMEOUT=500 etcd
``` ```
Or you can set the values within the configuration file: Or you can set the values within the configuration file:
```toml ```toml
[peer] [peer]
heartbeat_timeout = 100 heartbeat_interval = 100
election_timeout = 100 election_timeout = 100
``` ```

8
config/config.go
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@ -43,6 +43,7 @@ var newFlagNameLookup = map[string]string{
"serverCert": "peer-cert-file", "serverCert": "peer-cert-file",
"serverKey": "peer-key-file", "serverKey": "peer-key-file",
"snapshotCount": "snapshot-count", "snapshotCount": "snapshot-count",
"peer-heartbeat-timeout": "peer-heartbeat-interval",
} }
// Config represents the server configuration. // Config represents the server configuration.
@ -79,7 +80,7 @@ type Config struct {
CAFile string `toml:"ca_file" env:"ETCD_PEER_CA_FILE"` CAFile string `toml:"ca_file" env:"ETCD_PEER_CA_FILE"`
CertFile string `toml:"cert_file" env:"ETCD_PEER_CERT_FILE"` CertFile string `toml:"cert_file" env:"ETCD_PEER_CERT_FILE"`
KeyFile string `toml:"key_file" env:"ETCD_PEER_KEY_FILE"` KeyFile string `toml:"key_file" env:"ETCD_PEER_KEY_FILE"`
HeartbeatTimeout int `toml:"heartbeat_timeout" env:"ETCD_PEER_HEARTBEAT_TIMEOUT"` HeartbeatInterval int `toml:"heartbeat_interval" env:"ETCD_PEER_HEARTBEAT_INTERVAL"`
ElectionTimeout int `toml:"election_timeout" env:"ETCD_PEER_ELECTION_TIMEOUT"` ElectionTimeout int `toml:"election_timeout" env:"ETCD_PEER_ELECTION_TIMEOUT"`
} }
strTrace string `toml:"trace" env:"ETCD_TRACE"` strTrace string `toml:"trace" env:"ETCD_TRACE"`
@ -98,7 +99,7 @@ func New() *Config {
c.Snapshot = true c.Snapshot = true
c.SnapshotCount = 10000 c.SnapshotCount = 10000
c.Peer.Addr = "127.0.0.1:7001" c.Peer.Addr = "127.0.0.1:7001"
c.Peer.HeartbeatTimeout = defaultHeartbeatTimeout c.Peer.HeartbeatInterval = defaultHeartbeatInterval
c.Peer.ElectionTimeout = defaultElectionTimeout c.Peer.ElectionTimeout = defaultElectionTimeout
return c return c
} }
@ -286,7 +287,7 @@ func (c *Config) LoadFlags(arguments []string) error {
f.IntVar(&c.MaxRetryAttempts, "max-retry-attempts", c.MaxRetryAttempts, "") f.IntVar(&c.MaxRetryAttempts, "max-retry-attempts", c.MaxRetryAttempts, "")
f.Float64Var(&c.RetryInterval, "retry-interval", c.RetryInterval, "") f.Float64Var(&c.RetryInterval, "retry-interval", c.RetryInterval, "")
f.IntVar(&c.MaxClusterSize, "max-cluster-size", c.MaxClusterSize, "") f.IntVar(&c.MaxClusterSize, "max-cluster-size", c.MaxClusterSize, "")
f.IntVar(&c.Peer.HeartbeatTimeout, "peer-heartbeat-timeout", c.Peer.HeartbeatTimeout, "") f.IntVar(&c.Peer.HeartbeatInterval, "peer-heartbeat-interval", c.Peer.HeartbeatInterval, "")
f.IntVar(&c.Peer.ElectionTimeout, "peer-election-timeout", c.Peer.ElectionTimeout, "") f.IntVar(&c.Peer.ElectionTimeout, "peer-election-timeout", c.Peer.ElectionTimeout, "")
f.StringVar(&cors, "cors", "", "") f.StringVar(&cors, "cors", "", "")
@ -321,6 +322,7 @@ func (c *Config) LoadFlags(arguments []string) error {
f.IntVar(&c.MaxRetryAttempts, "r", c.MaxRetryAttempts, "(deprecated)") f.IntVar(&c.MaxRetryAttempts, "r", c.MaxRetryAttempts, "(deprecated)")
f.IntVar(&c.MaxClusterSize, "maxsize", c.MaxClusterSize, "(deprecated)") f.IntVar(&c.MaxClusterSize, "maxsize", c.MaxClusterSize, "(deprecated)")
f.IntVar(&c.SnapshotCount, "snapshotCount", c.SnapshotCount, "(deprecated)") f.IntVar(&c.SnapshotCount, "snapshotCount", c.SnapshotCount, "(deprecated)")
f.IntVar(&c.Peer.HeartbeatInterval, "peer-heartbeat-timeout", c.Peer.HeartbeatInterval, "(deprecated)")
// END DEPRECATED FLAGS // END DEPRECATED FLAGS
if err := f.Parse(arguments); err != nil { if err := f.Parse(arguments); err != nil {

2
config/timeout.go
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@ -5,5 +5,5 @@ const (
defaultElectionTimeout = 200 defaultElectionTimeout = 200
// The frequency (in ms) by which heartbeats are sent to followers. // The frequency (in ms) by which heartbeats are sent to followers.
defaultHeartbeatTimeout = 50 defaultHeartbeatInterval = 50
) )

10
etcd.go
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@ -109,10 +109,10 @@ func main() {
serverStats := server.NewRaftServerStats(config.Name) serverStats := server.NewRaftServerStats(config.Name)
// Calculate all of our timeouts // Calculate all of our timeouts
heartbeatTimeout := time.Duration(config.Peer.HeartbeatTimeout) * time.Millisecond heartbeatInterval := time.Duration(config.Peer.HeartbeatInterval) * time.Millisecond
electionTimeout := time.Duration(config.Peer.ElectionTimeout) * time.Millisecond electionTimeout := time.Duration(config.Peer.ElectionTimeout) * time.Millisecond
dialTimeout := (3 * heartbeatTimeout) + electionTimeout dialTimeout := (3 * heartbeatInterval) + electionTimeout
responseHeaderTimeout := (3 * heartbeatTimeout) + electionTimeout responseHeaderTimeout := (3 * heartbeatInterval) + electionTimeout
// Create peer server // Create peer server
psConfig := server.PeerServerConfig{ psConfig := server.PeerServerConfig{
@ -145,7 +145,7 @@ func main() {
} }
// Create raft transporter and server // Create raft transporter and server
raftTransporter := server.NewTransporter(followersStats, serverStats, registry, heartbeatTimeout, dialTimeout, responseHeaderTimeout) raftTransporter := server.NewTransporter(followersStats, serverStats, registry, heartbeatInterval, dialTimeout, responseHeaderTimeout)
if psConfig.Scheme == "https" { if psConfig.Scheme == "https" {
raftClientTLSConfig, err := config.PeerTLSInfo().ClientConfig() raftClientTLSConfig, err := config.PeerTLSInfo().ClientConfig()
if err != nil { if err != nil {
@ -158,7 +158,7 @@ func main() {
log.Fatal(err) log.Fatal(err)
} }
raftServer.SetElectionTimeout(electionTimeout) raftServer.SetElectionTimeout(electionTimeout)
raftServer.SetHeartbeatInterval(heartbeatTimeout) raftServer.SetHeartbeatInterval(heartbeatInterval)
ps.SetRaftServer(raftServer) ps.SetRaftServer(raftServer)
// Create etcd server // Create etcd server

4
server/usage.go
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@ -44,8 +44,8 @@ Peer Communication Options:
-peer-ca-file=<path> Path to the peer CA file. -peer-ca-file=<path> Path to the peer CA file.
-peer-cert-file=<path> Path to the peer cert file. -peer-cert-file=<path> Path to the peer cert file.
-peer-key-file=<path> Path to the peer key file. -peer-key-file=<path> Path to the peer key file.
-peer-heartbeat-timeout=<time> -peer-heartbeat-interval=<time>
Time (in milliseconds) for a heartbeat to timeout. Time (in milliseconds) of a heartbeat interval.
-peer-election-timeout=<time> -peer-election-timeout=<time>
Time (in milliseconds) for an election to timeout. Time (in milliseconds) for an election to timeout.

10
tests/server_utils.go
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@ -19,7 +19,7 @@ const (
testClientURL = "localhost:4401" testClientURL = "localhost:4401"
testRaftURL = "localhost:7701" testRaftURL = "localhost:7701"
testSnapshotCount = 10000 testSnapshotCount = 10000
testHeartbeatTimeout = time.Duration(50) * time.Millisecond testHeartbeatInterval = time.Duration(50) * time.Millisecond
testElectionTimeout = time.Duration(200) * time.Millisecond testElectionTimeout = time.Duration(200) * time.Millisecond
) )
@ -51,15 +51,15 @@ func RunServer(f func(*server.Server)) {
} }
// Create Raft transporter and server // Create Raft transporter and server
dialTimeout := (3 * testHeartbeatTimeout) + testElectionTimeout dialTimeout := (3 * testHeartbeatInterval) + testElectionTimeout
responseHeaderTimeout := (3 * testHeartbeatTimeout) + testElectionTimeout responseHeaderTimeout := (3 * testHeartbeatInterval) + testElectionTimeout
raftTransporter := server.NewTransporter(followersStats, serverStats, registry, testHeartbeatTimeout, dialTimeout, responseHeaderTimeout) raftTransporter := server.NewTransporter(followersStats, serverStats, registry, testHeartbeatInterval, dialTimeout, responseHeaderTimeout)
raftServer, err := raft.NewServer(testName, path, raftTransporter, store, ps, "") raftServer, err := raft.NewServer(testName, path, raftTransporter, store, ps, "")
if err != nil { if err != nil {
panic(err) panic(err)
} }
raftServer.SetElectionTimeout(testElectionTimeout) raftServer.SetElectionTimeout(testElectionTimeout)
raftServer.SetHeartbeatInterval(testHeartbeatTimeout) raftServer.SetHeartbeatInterval(testHeartbeatInterval)
ps.SetRaftServer(raftServer) ps.SetRaftServer(raftServer)
s := server.New(testName, "http://"+testClientURL, ps, registry, store, nil) s := server.New(testName, "http://"+testClientURL, ps, registry, store, nil)