README
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Cadence Worker (In Development)
Cadence Worker is a new role for Cadence service used for hosting any components responsible for performing background processing on the Cadence cluster.
Replicator
Replicator is a background worker responsible for consuming replication tasks generated by remote Cadence clusters and pass it down to processor so they can be applied to local Cadence cluster.
It uses Kafka as the replication tasks buffer and relies on [kafka-client library] (https://github.com/uber-go/kafka-client/) for consuming messages from Kafka.
Quickstart for localhost development
- Setup Kafka by following instructions: Kafka Quickstart
- Create Kafka topic for active cluster:
bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic active
- Create Kafka topic for standby cluster:
bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic standby
- Start Cadence development server for active zone:
./cadence-server --zone active start
Cadence cluster is now running with the replicator consuming messages from Kafka topic standby.
Create replication task using CLI
Kafka CLI can be used to generate a replication task for testing purpose:
bin/kafka-console-producer.sh --broker-list localhost:9092 --topic standby
Replication task message:
{taskType: 0}
Documentation
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Index ¶
Constants ¶
This section is empty.
Variables ¶
var ( // ErrEmptyDomainReplicationTask is the error to indicate empty replication task ErrEmptyDomainReplicationTask = errors.New("empty domain replication task") // ErrInvalidDomainOperation is the error to indicate empty domain operation attribute ErrInvalidDomainOperation = errors.New("invalid domain operation attribute") // ErrInvalidDomainID is the error to indicate empty rID attribute ErrInvalidDomainID = errors.New("invalid domain ID attribute") // ErrInvalidDomainInfo is the error to indicate empty info attribute ErrInvalidDomainInfo = errors.New("invalid domain info attribute") // ErrInvalidDomainConfig is the error to indicate empty config attribute ErrInvalidDomainConfig = errors.New("invalid domain config attribute") // ErrInvalidDomainReplicationConfig is the error to indicate empty replication config attribute ErrInvalidDomainReplicationConfig = errors.New("invalid domain replication config attribute") // ErrInvalidDomainConfigVersion is the error to indicate empty config version attribute ErrInvalidDomainConfigVersion = errors.New("invalid domain config version attribute") // ErrInvalidDomainFailoverVersion is the error to indicate empty failover version attribute ErrInvalidDomainFailoverVersion = errors.New("invalid domain failover version attribute") // ErrInvalidDomainStatus is the error to indicate invalid domain status ErrInvalidDomainStatus = errors.New("invalid domain status attribute") )
var ( // ErrEmptyReplicationTask is the error to indicate empty replication task ErrEmptyReplicationTask = errors.New("empty replication task") // ErrUnknownReplicationTask is the error to indicate unknown replication task type ErrUnknownReplicationTask = errors.New("unknown replication task") )
Functions ¶
func NewService ¶
func NewService(params *service.BootstrapParams) common.Daemon
NewService builds a new cadence-worker service
Types ¶
type Config ¶
type Config struct {
// Replicator settings
ReplicatorConcurrency int
}
Config contains all the service config for worker
type DomainReplicator ¶
type DomainReplicator interface {
HandleReceivingTask(task *replicator.DomainTaskAttributes) error
}
DomainReplicator is the interface which can replicate the domain
func NewDomainReplicator ¶
func NewDomainReplicator(metadataManager persistence.MetadataManager, logger bark.Logger) DomainReplicator
NewDomainReplicator create a new instance odf domain replicator
type Replicator ¶
type Replicator struct {
// contains filtered or unexported fields
}
Replicator is the processor for replication tasks
func NewReplicator ¶
func NewReplicator(clusterMetadata cluster.Metadata, metadataManager persistence.MetadataManager, config *Config, client messaging.Client, logger bark.Logger, metricsClient metrics.Client) *Replicator
NewReplicator creates a new replicator for processing replication tasks
type Service ¶
type Service struct {
// contains filtered or unexported fields
}
Service represents the cadence-worker service. This service host all background processing which needs to happen for a Cadence cluster. This service runs the replicator which is responsible for applying replication tasks generated by remote clusters.
Source Files