Tip: Expire Triggers will become the default in Cylc 8.8

Cylc Tips
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In Cylc 8.6.0, we introduced an experimental feature where “suicide triggers” were re-implemented as “expire triggers”.

In Cylc 8.8.0, this will become the default behaviour.

Original announcement: Tip: Experimental feature - expire triggers

This is a subtle change to how the ! syntax in Cylc graphs is interpreted:

  • Under the current default behaviour, ! triggers cause tasks to be removed.
  • Under the new experimental behaviour, ! triggers cause tasks to enter the expired state.

This is a minimal change, it can potentially have impacts on workflows in the niche situations where the expired output of a “suicide triggered” task is already used in the graph for other purposes.

You can opt in to the experimental behaviour by setting the [scheduler][experimental]expire triggers setting:

# opt into the "expire triggers" experimental feature
[scheduler]
    [experimental]
        expire triggers = True