Scheduling guide type: Cron

Cron connector

A process-local datasource that evaluates portable five-field schedules.

When to use

Use this page while designing, implementing, operating, or troubleshooting scheduled and durable execution.

Behavior

It starts after graph pools, components, and Sinks are ready.
Each enabled endpoint registers one recurring schedule.
Shutdown closes schedule admission and drains an accepted invocation within the service deadline.

Replica semantics

Three replicas can fire the same Cron expression three times. Choose a Temporal Schedule or explicit leader election for one durable cluster-level occurrence.

Implementation properties

Allowed adapter depends on service language.

PropertyTypeDescription

goImplementationenum

Go adapter.

RequiredAllowed: go/gocron

cppUserverImplementationenum

C++ userver adapter.

RequiredAllowed: cpp/libcron

cppBoostImplementationenum

C++ Boost adapter.

RequiredAllowed: cpp/libcron

pythonImplementationenum

Python adapter.

RequiredAllowed: python/apscheduler

rustImplementationenum

Rust adapter.

RequiredAllowed: rust/croner

typeScriptImplementationenum

TypeScript adapter.

RequiredAllowed: node/croner

Product-level example

dataConnectors:
  <connector_name>:
    type: Cron
    <languageImplementation>: <allowed_value>