Documentation
¶
Overview ¶
Package config contains functions and types used for managing dragonboat's configurations.
Index ¶
Examples ¶
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
func IsValidAddress ¶
IsValidAddress returns whether the input address is valid.
Types ¶
type Config ¶
type Config struct {
// NodeID is a non-zero value used to identify a node within a Raft cluster.
NodeID uint64
// ClusterID is the unique value used to identify a Raft cluster.
ClusterID uint64
// IsObserver indicates whether this is an observer Raft node without voting
// power.
IsObserver bool
// CheckQuorum specifies whether the leader node should periodically check
// non-leader node status and step down to become a follower node when it no
// longer has the quorum.
CheckQuorum bool
// Quiesce specifies whether to let the Raft cluster enter quiesce mode when
// there is no cluster activity.
Quiesce bool
// ElectionRTT is the minimum number of message RTT between elections. Message
// RTT is defined by NodeHostConfig.RTTMillisecond. The Raft paper suggests it
// to be a magnitude greater than HeartbeatRTT, which is the interval between
// two heartbeats. In Raft, the actual interval between elections is
// randomized to be between ElectionRTT and 2 * ElectionRTT.
//
// As an example, assuming NodeHostConfig.RTTMillisecond is 100 millisecond,
// to set the election interval to be 1 second, then ElectionRTT should be set
// to 10.
//
// When CheckQuorum is enabled, ElectionRTT also defines the interval for
// checking leader quorum.
ElectionRTT uint64
// HeartbeatRTT is the number of message RTT between heartbeats. Message
// RTT is defined by NodeHostConfig.RTTMillisecond. The Raft paper suggest the
// heartbeat interval to be close to the average RTT between nodes.
HeartbeatRTT uint64
// SnapshotEntries defines how often state machine should be snapshotted
// defined in terms of number of applied entries. Set SnapshotEntries to 0 to
// disable Raft snapshotting and log compaction.
SnapshotEntries uint64
// CompactionOverhead defines the number of most recent entries to keep after
// Raft log compaction.
CompactionOverhead uint64
// OrderedConfigChange determines whether Raft membership change is enforced
// with ordered config change ID.
OrderedConfigChange bool
}
Config is used to configure Raft nodes.
type LogDBFactoryFunc ¶
LogDBFactoryFunc is the factory function that creates NodeHost's persistent storage module known as Log DB.
type NodeHostConfig ¶
type NodeHostConfig struct {
// DeploymentID is used to determine whether two NodeHost instances belong to
// the same deployment and thus allowed to communicate with each other. This
// helps to prvent accidentially misconfigured NodeHost instances to cause
// data corruption errors by sending out of context messages to unrelated
// Raft nodes.
// For a particular dragonboat based application, you can set DeploymentID
// to the same uint64 value on all production NodeHost instances, then use
// different DeploymentID values on your staging and dev environment. It is
// also recommended to use different DeploymentID values for different
// dragonboat based applications.
// When not set, the default value 0 will be used as the deployment ID and
// thus allowing all NodeHost instances with deployment ID 0 to communicate
// with each other.
DeploymentID uint64
// WALDir is the directory used for storing the WAL of Raft entries. It is
// recommended to use low latency storage such as NVME SSD with power loss
// protection to store such WAL data. Leave WALDir to have zero value will
// have everything stored in NodeHostDir.
WALDir string
// NodeHostDir is where everything else is stored.
NodeHostDir string
// RTTMillisecond defines the average Rround Trip Time (RTT) in milliseconds
// between two NodeHost instances. Such a RTT interval is internally used as
// a logical clock tick, Raft heartbeat and election intervals are both
// defined in term of how many such RTT intervals.
// Note that RTTMillisecond is the combined delays between two NodeHost
// instances including all delays caused by network transmission, delays
// caused by NodeHost queuing and processing. As an example, when fully
// loaded, the average Rround Trip Time between two of our NodeHost instances
// used for benchmarking purposes is up to 500 microseconds when the ping time
// between them is 100 microseconds.
RTTMillisecond uint64
// RaftAddress is a hostname:port address used by the Raft RPC module for
// exchanging Raft messages. This is also the identifier value to identify
// a NodeHost instance.
RaftAddress string
// APIAddress is the address used by the optional NodeHost RPC API. Empty
// value means NodeHost API RPC server is not used. This optional field
// only need to be set when using Master servers.
APIAddress string
// MasterServers is a list of Master server addresses to use. Master servers
// are optional component. Empty or nil value means that there is no Master
// server configured for this deployment.
MasterServers []string
// MutualTLS defines whether to use mutual TLS for authenticating servers
// and clients. Insecure communication is used when MutualTLS is set to
// False.
// See https://github.com/lni/dragonboat/wiki/TLS-in-Dragonboat for more
// details on how to use Mutual TLS.
MutualTLS bool
// CAFile is the path of the CA certificate file. This field is ignored when
// MutualTLS is false.
CAFile string
// CertFile is the path of the node certificate file. This field is ignored
// when MutualTLS is false.
CertFile string
// KeyFile is the path of the node key file. This field is ignored when
// MutualTLS is false.
KeyFile string
// LogDBFactory is the factory function used for creating the Log DB instance
// used by NodeHost. The default zero value causes the default built-in RocksDB
// based Log DB implementation to be used.
LogDBFactory LogDBFactoryFunc
// RaftRPCFactory is the factory function used for creating the Raft RPC
// instance for exchanging Raft message between NodeHost instances. The default
// zero value causes the built-in TCP based RPC module to be used.
RaftRPCFactory RaftRPCFactoryFunc
}
NodeHostConfig is the configuration used to configure NodeHost instances.
Example ¶
// import "github.com/lni/dragonboat/plugin/rpc"
nhc := NodeHostConfig{
WALDir: "/data/wal",
NodeHostDir: "/data/dragonboat-data",
RTTMillisecond: 200,
RaftAddress: "node01.raft.company.com:5012",
// set this if you want to use gRPC based RPC module for exchanging raft data between raft nodes.
// RaftRPCFactory: rpc.NewRaftGRPC,
}
_ = nhc
Output:
func (*NodeHostConfig) GetClientTLSConfig ¶
func (c *NodeHostConfig) GetClientTLSConfig(target string) (*tls.Config, error)
GetClientTLSConfig returns the client tls.Config instance for the specified target based on the TLS settings in NodeHostConfig.
func (*NodeHostConfig) GetServerTLSConfig ¶
func (c *NodeHostConfig) GetServerTLSConfig() (*tls.Config, error)
GetServerTLSConfig returns the server tls.Config instance based on the TLS settings in NodeHostConfig.
func (*NodeHostConfig) MasterMode ¶
func (c *NodeHostConfig) MasterMode() bool
MasterMode returns a boolean value indicating whether the NodeHost is set to run in Master mode.
func (*NodeHostConfig) Validate ¶
func (c *NodeHostConfig) Validate() error
Validate validates the NodeHostConfig instance and return an error when the configuration is considered as invalid.
type RaftRPCFactoryFunc ¶
type RaftRPCFactoryFunc func(NodeHostConfig, raftio.RequestHandler, raftio.ChunkSinkFactory) raftio.IRaftRPC
RaftRPCFactoryFunc is the factory function that creates the Raft RPC module instance for exchanging Raft messages between NodeHosts.
Source Files
Click to show internal directories.
Click to hide internal directories.