DataEngine functions are triggered by events. Create triggers to define which events to watch for. A trigger can either produce events on a schedule or watch for events related to S3 objects or NFSv4 files in a view. You can build triggers into a pipeline and so that they trigger functions.
From the left navigation menu, select Manage Elements (
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) and then Triggers.Click Create New Trigger.
Enter a name for the trigger in the Trigger Name field.
In the Trigger Type dropdown, select the type of trigger you want to create:
Element. A trigger that watches for events related to elements in a source view.
Schedule. A trigger that produces events on a schedule.
Complete the relevant fields:
If you selected Element as the Trigger Type:
Description
A description for the trigger.
Source Type
The type of elements that register events for the trigger:
S3. S3 objects.
NFS. NFSv4 files.
Source View
From the dropdown, select the view in which the events will occur.
The dropdown lists all views configured correctly for the selected Source Type on the local VAST Cluster tenant to which you have permission to access.
Event Type
From the dropdown, select one or more types of events that the trigger should watch.
ElementCreated. The creation of an element in the source view.
ElementDeleted. The deletion of an element from the source view.
ElementTagCreated. The creation of a tag on an S3 object in the source view.
Note
This type is supported only if Source Type is S3.
ElementTagDeleted. The deletion of a tag on an S3 object in the source view.
Note
This type is supported only if Source Type is S3.
Tip
Under Filters, you can further specify which elements can trigger events.
Target Event Broker View
From the dropdown, select the view that hosts the VAST Event Broker to use to stream events for the trigger.
Topic
From the dropdown, select the event broker topic that should be used.
Element Name Filters
To filter elements by suffix or prefix, enter a prefix and/or a suffix. The event type definition will be restricted to elements with the specified prefix and/or suffix in their element names.
If Source Type is S3, these filters apply to the object key.
If Source Type is NFS, these filters apply to the file path.
Custom Extensions
Use this field to add key-value pairs to be passed as event output extensions. Each key can contain only lowercase letters and digits, must start with a letter, and must be 1-20 characters long.
Tags
Use this field to tag the trigger.
To add a tag, click Add Tags, enter a key-value pair in the fields provided and then click Add to Tags.
If you selected Schedule as the Trigger Type:
Description
A description for the trigger.
Target Kafka View
From the dropdown, select the view that hosts the VAST Event Broker to use to stream events for the trigger.
Topic
From the dropdown, select the event broker topic that should be used.
Schedule
Do either of the following to define a schedule for the trigger:
Select Simple and use the fields provided to enter a frequency.
Select Advanced to type the schedule in Quartz syntax.
Custom Extensions
Use this field to add key-value pairs to be passed as event output extensions. Each key can contain only lowercase letters and digits, must start with a letter, and must be 1-20 characters long.
Tags
Optionally add tags to the trigger. To add a tag, click Add Tags, enter a key-value pair in the fields provided and then click Add to Tags.
Click Create Trigger.
The trigger is created and is listed in the Triggers page.