Skip to main content

temporal

  • temporalio/temporal
    • cadence fork, 包含原始团队人员
    • Persistence - Cassandra, PostgreSQL, MySQL
    • Workflow search - Elasticsearch v6.8+ - 高级搜索
    • 更适合中小规模
      • 使用更方便
      • 支持更多 SDK - Go, Java, PHP, Typescript
      • 没有 uber 包袱 - 环境、rpc、历史实现
    • temporalite 支持 SQLite
  • temporalio/sdk-core
    • MIT, Rust
    • Core Temporal SDK
# https://github.com/temporalio/docker-compose
# Elasticsearch + PostgreSQL + Web + UI
# temporal-web http://localhost:8088/namespaces
# temporal-ui http://localhost:8080/
# temporal :7233
# postgresql :5432
# elasticsearch :9200
curl -o docker-compose.yml https://raw.githubusercontent.com/temporalio/docker-compose/main/docker-compose-ui-experimental.yml
curl --create-dirs -LO --output-dir dynamicconfig https://raw.githubusercontent.com/temporalio/docker-compose/main/dynamicconfig/development_es.yaml
curl -O --output-dir dynamicconfig https://raw.githubusercontent.com/temporalio/docker-compose/main/dynamicconfig/development.yaml
docker-compose up

# tctl in docker
alias tctl="docker exec --env TEMPORAL_CLI_ADDRESS=host.docker.internal:7233 temporal-admin-tools tctl"
tctl namespace describe

# temporalite
temporalite start -f temporalite.db
note
  • sqlite in production #3366
  • Replace elastic with zinc #2380

tctl

envdefault
TEMPORAL_CLI_ADDRESS127.0.0.1:7233
TEMPORAL_CLI_NAMESPACEdefault
# install on Host
brew install tctl
# run in Docker
docker run --rm -it --entrypoint tctl --env TEMPORAL_CLI_ADDRESS=host.docker.internal:7233 temporalio/admin-tools

# 健康状态 - 正常为 SERVING
tctl cluster health
tctl --ns default namespace register --rd 7 --desc "Default namespace for Temporal Server."
# 可能需要等一会儿
tctl --ns default namespace describe

# 管理: workflow/wf, shard/shar, history_host/hist, taskqueue/tq, membership, cluster/cl, dlq, db, decode
tctl admin
# 集群管理 - 搜索属性、remote-cluster
tctl admin cluster

部署

  • Persistence
    • Cassandra, PostgreSQL, MySQL
    • SQLite WIP
  • Workflow search
    • Elasticsearch v6.8+
  • Helm https://github.com/temporalio/helm-charts
  • 限制 - Server limits
    • gRPC 4MB
    • TransactionSizeLimit 4MB - 事务大小限制
    • Blob size limit - 请求包大小
      • BlobSizeLimitWarn 512KB
      • BlobSizeLimitError 2MB
    • History total size limit - 历史大小
      • HistorySizeLimitWarn 10MB
      • HistorySizeLimitError 50MB
    • History total count limit - 历史事件数量
      • HistoryCountLimitWarn 10000
      • HistoryCountLimitError 50000
    • Search Attributes
      • SearchAttributesNumberOfKeysLimit 100 - 数量
      • SearchAttributesTotalSizeLimit 2KB - 单个属性大小
      • SearchAttributesSizeOfValueLimit 40KB - 中大小
    • Child Workflow - History 独立于 Parent - 可用于 Partition History 压力
      • 每个 Workflow 最多 1000 Child Workflow
        • Child Workflow 的 Child Workflow 不受影响
        • 可以多层级
      • 尽量在单层 Workflow History 有压力的时候再使用
        • 尽量 Activities 都在一层 Workflow
    • ContinueAsNew - 从新计 History - 用于减缓 History 压力
  • Antipatterns & Best practices

Server

  • Temporal Server options
  • authorization.Authorizer
    • 判断是否有权限操作
    • 基于当前 Claim 的 Role
  • authorization.ClaimMapper
    • AuthInfo -> Claims -> Namespace&Role
  • authorization.TokenKeyProvider
    • alg+kid -> Key
    • 不能获取到当前 Claim 信息
    • 支持配置 RefreshInterval 更新
  • fx - temporal 使用 fx 做 IoC
    • 每个 Service 有自己的 fx 上下文
    • ServerFx - root fx.App - Bootstrap
    • ServerImpl.Start 会启动所有的 ServicesMetadata
    • resource.BootstrapParams Service 启动上下文
  • Workflow
    • Workflow Task Timeout - 10s
    • ChildWorkflow
      • ParentClosePolicy
        • ABANDON - Parent 结束, Child 不受影响
        • TERMINATE - 立即终止
        • REQUEST_CANCEL - 请求取消
  • Activity
    • 状态
      • Scheduled -> Started -> Completed
      • Scheduled -> Started -> Retry Backoff -> Scheduled
    • 超时
      • ScheduleToStart - 默认 ∞
        • 每次 Scheduled -> Started
      • StartToClose - 默认=ScheduleToStart
        • 每次 Started -> Completed
      • ScheduleToClose - 默认 ∞ - 总体绝对时间
        • Scheduled -> * -> Completed
    • LocalActivity
      • 用于本地快速执行的函数 - < 10s
      • 使用更少的 Temporal 服务资源 - 不记录
      • 本地执行 - 无 队列、流控、限流、路由 能力
      • 不需要 Heartbeating
      • 更低延时
      • 尽量使用 正常 Activity - LocalActivity vs Activity
  • TaskQueue
    • Sticky Execution - 默认开启 - DisableStickyExecution
      • Worker 完成了 Workflow 的第一个任务,则会开始拉取之后的更新
      • 集群暂时不需要进行调度
      • StickyScheduleToStartTimeout=5s - 当粘性 执行/Pull 超时后,集群恢复调度 Workflow
      • StickyWorkflowCacheSize=10,000
  • Signal
    • Recipient - WorkflowExecution=Namespace + Workflow Id
    • Id
    • Name - queue
  • AdvancedVisibility
  • 组件
    • frontend - 网关
      • 限流、路由、认证
    • history
      • 维护数据 - 状态、队列、计时器
    • matching
      • 分发任务
    • worker
      • 执行内部后台任务
  • 命名空间
    • temporal-system - 内部命名空间 - retention=7d
    • defaulr - 默认命名空间
  • 查询
    • __stack_trace
    • __open_sessions
  • 授权
    • Claim {"permission":["<namespace>:"permission""]}
    • namespace=system - 特殊 namespace
    • permission <-> role
      • read - Reader
      • write - Writer
      • admin - Admin
      • worker - Worker
      • 其他 - Undefined
    • role 有继承逻辑
# 实际会运行的服务
temporal-server start --service=history
temporal-server start --service=frontend
temporal-server start --service=matching
temporal-server start --service=worker
# 可以一次性启动
temporal-server start --service=history --service=frontend --service=matching --service=worker
  • 目录结构
    • ./ - PWDPWD - TEMPORAL_ROOT - 根目录
    • config/ - $TEMPORAL_CONFIG_DIR - 配置目录
      • development.yaml - $TEMPORAL_ENVIRONMENT.yaml - 环境配置
      • dynamicconfig/ - 动态配置 - dynamicConfigClient.dynamicconfig

配置

log:
stdout: true
# debug, info, warn, error or fatal, info.
level: info
outputFile:
# 持久化配置
persistence:
numHistoryShards: 1000
defaultStore: default
visibilityStore: visibility
advancedVisibilityStore: es-visibility
datastores:
default:
sql:
pluginName: postgres
databaseName:
connectAddr: 127.0.0.1:5432
# tcp,unix
connectProtocol: tcp
user:
password:
maxConns:
maxIdleConns:
maxConnLifetime: 1h
tls:
enabled: true
enableHostVerification: false
connectAttributes:
search_path: temporal

# 全局配置
global:
membership:
maxJoinDuration: 30s
authorization:
jwtKeyProvider:
keySourceURIs: []
refreshInterval: 1m
permissionsClaimName: permissions
authorizer:
claimMapper:

# 集群元数据 - 用于多集群复制
clusterMetadata:
# 是否允许全局命名空间
enableGlobalNamespace: false
failoverVersionIncrement: 10
masterClusterName: 'active'
# 集群名字 - 启动后便不可变
currentClusterName: 'active'
clusterInformation:
active:
enabled: true
initialFailoverVersion: 0
# 支持 DNS dns:///
rpcAddress: '127.0.0.1:7233'
replicationConsumer:
# kafka,rpc
type: rpc

Auth

{
"permissions": ["namespace:permission"]
}

Bootstrap

docker run --rm -it \
-e DB=postgresql \
-e DB_PORT=5432 \
-e POSTGRES_USER=temporal \
-e POSTGRES_PWD=temporal \
-e POSTGRES_SEEDS=postgresql \
--entrypoint bash \
temporalio/auto-setup:1.14.2
  • PostgresSQL 支持 search_path, tls
    • --ca search_path=visibility --tls --tls-disable-host-verification
temporal-sql-tool --ep 127.0.0.1 -p 5432 -u temporal -pw temporal --pl postgres create --db temporal
temporal-sql-tool --ep 127.0.0.1 -p 5432 -u temporal -pw temporal --pl postgres --db temporal setup -v 0.0
temporal-sql-tool --ep 127.0.0.1 -p 5432 -u temporal -pw temporal --pl postgres --db temporal update-schema -d ./schema/postgresql/v96/temporal/versioned
temporal-sql-tool --ep 127.0.0.1 -p 5432 -u temporal -pw temporal --pl postgres create --db temporal_visibility
temporal-sql-tool --ep 127.0.0.1 -p 5432 -u temporal -pw temporal --pl postgres --db temporal_visibility setup-schema -v 0.0
temporal-sql-tool --ep 127.0.0.1 -p 5432 -u temporal -pw temporal --pl postgres --db temporal_visibility update-schema -d ./schema/postgresql/v96/visibility/versioned

temporal-web

docker run --rm -it \
-v $PWD/config.yml:/usr/app/server/config.yml \
-p 8088:8088 \
temporalio/web:latest
config.yml
auth:
enabled: true # Temporal Web checks this first before reading your provider config
providers:
- label: 'Auth0 oidc' # for internal use; in future may expose as button text
type: oidc # for futureproofing; only oidc is supported today
issuer: https://myorg.us.auth0.com
client_id: xxxxxxxxxxxxxxxxxxxx
client_secret: xxxxxxxxxxxxxxxxxxxx
scope: openid profile email
audience: # identifier of the audience for an issued token (optional)
callback_base_uri: http://localhost:8088
pass_id_token: false # adds ID token as 'authorization-extras' header with every request to server