Trigger connections - 7.1

Talend Data Management Platform Studio User Guide

author
Talend Documentation Team
EnrichVersion
7.1
EnrichProdName
Talend Data Management Platform
task
Design and Development
EnrichPlatform
Talend Studio

Trigger connections define the processing sequence, so no data is handled through these connections.

The connection in use will create a dependency between Jobs or subJobs which therefore will be triggered one after the other according to the trigger nature.

Trigger connections fall into two categories:

  • subJob triggers: On Subjob Ok, On Subjob Error and Run if,

  • component triggers: On Component Ok, On Component Error and Run if.

OnSubjobOK (previously Then Run): This connection is used to trigger the next subJob on the condition that the main subJob completed without error. This connection is to be used only from the start component of the Job.

These connections are used to orchestrate the subJobs forming the Job or to easily troubleshoot and handle unexpected errors.

OnSubjobError: This connection is used to trigger the next subJob in case the first (main) subJob do not complete correctly. This "on error" subJob helps flagging the bottleneck or handle the error if possible.

OnComponentOK and OnComponentError are component triggers. They can be used with any source component on the subJob.

OnComponentOK will only trigger the target component once the execution of the source component is complete without error. Its main use could be to trigger a notification subJob for example.

OnComponentError will trigger the subJob or component as soon as an error is encountered in the primary Job.

Run if triggers a subJob or component in case the condition defined is met. For further information about Run if, see Run if connection settings.

For how to set a trigger condition, see  Trigger connection settings.

Note:

It is possible to add checkpoints to certain trigger connections in order to be able to recover the execution of a Job from the last checkpoint previous to the error. For more information, see Setting checkpoints on trigger connections.