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vRealize Automation 7.3 # Event Broker Service - Blocking vs Non Blocking
By Pranay Jha | Jan 4, 2018 | In Articles | Update: Jan 4, 2018 | Total Views [ 301 ]
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vRealie Automation 7 extensibility though vRealize Orchestrator using Event Broker Service (EBS)

Blocking vs. Non-Blocking Subscriptions:

Subscriptions can monitor or control the underlying workflow:

  • Nonblocking subscriptions allow the workflow to complete without interruption.
  • Blocking subscriptions pause workflows to wait for sbscriber input.
Workflow fails
Request fails
Request succeeds
Workflow return values
Returns are processed
Returns are discarded
Workflows run in sequence per request
Workflows run in parallel for multiple requests
Workflows run in parallel
To manipulate and edit stuff during events
To fire and forget tasks

The default subscription is nonblocking. Events are delivered asynchronously to subscribers and have no derect impact to the workflow. When a workflow posts an event that triggers the subscription, the workflow continues to run and doesn't monitor whether the event was picked up.
A blocking subscription is different in that it pauses the workflow until the events that trigger a subscription are processed by the subscriber. The subscriber can send feedback to the workflow by changing variables or issuing exceptions.
It is important to know that when you are creating a new subscription, always start with a blocking subscription and limit the events that subscription triggers on to a single blueprint. This practice makes troubleshooting the subscription much easier and prevents the subscription from interfering with normal operatations.

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About the Author

Pranay Jha
Pranay Jha
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Thank you for visiting my profile. I am Pranay Jha, bring along a total of 11+ years of extensive experience with me in Information Technology sector for organizations from small business to large enterprises, wherein my current assignment I am associated with IBM as a Technical Solution Architect for Virtualization platform. I am also an Independent blogger and founder of I can be reached via email at or Direct Message via Contact Us form.

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