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embed: add "InitialElectionTickAdvance"

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Signed-off-by: Gyuho Lee <gyuhox@gmail.com>
This commit is contained in:
Gyuho Lee 2018-04-19 14:03:17 -07:00
parent 3fe9030d34
commit bffc532f9f
2 changed files with 69 additions and 37 deletions
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31
embed/config.go
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@ -123,6 +123,36 @@ type Config struct {
// make ticks a cluster wide configuration.
TickMs uint `json:"heartbeat-interval"`
ElectionMs uint `json:"election-timeout"`
// InitialElectionTickAdvance is true, then local member fast-forwards
// election ticks to speed up "initial" leader election trigger. This
// benefits the case of larger election ticks. For instance, cross
// datacenter deployment may require longer election timeout of 10-second.
// If true, local node does not need wait up to 10-second. Instead,
// forwards its election ticks to 8-second, and have only 2-second left
// before leader election.
//
// Major assumptions are that:
// - cluster has no active leader thus advancing ticks enables faster
// leader election, or
// - cluster already has an established leader, and rejoining follower
// is likely to receive heartbeats from the leader after tick advance
// and before election timeout.
//
// However, when network from leader to rejoining follower is congested,
// and the follower does not receive leader heartbeat within left election
// ticks, disruptive election has to happen thus affecting cluster
// availabilities.
//
// Disabling this would slow down initial bootstrap process for cross
// datacenter deployments. Make your own tradeoffs by configuring
// --initial-election-tick-advance at the cost of slow initial bootstrap.
//
// If single-node, it advances ticks regardless.
//
// See https://github.com/coreos/etcd/issues/9333 for more detail.
InitialElectionTickAdvance bool `json:"initial-election-tick-advance"`
QuotaBackendBytes int64 `json:"quota-backend-bytes"`
MaxTxnOps uint `json:"max-txn-ops"`
MaxRequestBytes uint `json:"max-request-bytes"`
@ -307,6 +337,7 @@ func NewConfig() *Config {
TickMs: 100,
ElectionMs: 1000,
InitialElectionTickAdvance: true,
LPUrls: []url.URL{*lpurl},
LCUrls: []url.URL{*lcurl},

1
embed/etcd.go
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@ -174,6 +174,7 @@ func StartEtcd(inCfg *Config) (e *Etcd, err error) {
PeerTLSInfo: cfg.PeerTLSInfo,
TickMs: cfg.TickMs,
ElectionTicks: cfg.ElectionTicks(),
InitialElectionTickAdvance: cfg.InitialElectionTickAdvance,
AutoCompactionRetention: autoCompactionRetention,
AutoCompactionMode: cfg.AutoCompactionMode,
QuotaBackendBytes: cfg.QuotaBackendBytes,