Execution Fail

Execution Fail

Certified

Intentionally fail the execution.

Throws an error to end the flow. If condition is provided, it is rendered and coerced to boolean (via TruthUtils); failure occurs only when it is truthy. Without condition the task always fails.

Use errorMessage to control the logged/raised message; helpful for explicit branch failures or alert routing.

yaml
type: io.kestra.plugin.core.execution.Fail

Fail on a switch branch

yaml
id: fail_on_switch
namespace: company.team

inputs:
  - id: param
    type: STRING
    required: true

tasks:
  - id: switch
    type: io.kestra.plugin.core.flow.Switch
    value: "{{inputs.param}}"
    cases:
      case1:
        - id: case1
          type: io.kestra.plugin.core.log.Log
          message: Case 1
      case2:
        - id: case2
          type: io.kestra.plugin.core.log.Log
          message: Case 2
      notexist:
        - id: fail
          type: io.kestra.plugin.core.execution.Fail
      default:
        - id: default
          type: io.kestra.plugin.core.log.Log
          message: default

Fail on a condition

yaml
id: fail_on_condition
namespace: company.team

inputs:
  - name: param
    type: STRING
    required: true

tasks:
  - id: before
    type: io.kestra.plugin.core.log.Log
    message: I'm before the fail on condition

  - id: fail
    type: io.kestra.plugin.core.execution.Fail
    condition: '{{ inputs.param == "fail" }}'

  - id: after
    type: io.kestra.plugin.core.log.Log
    message: I'm after the fail on condition

Using errorLogs function to send error message to Slack

yaml
id: error_logs
namespace: company.team

tasks:
- id: fail
    type: io.kestra.plugin.core.execution.Fail
    errorMessage: Something went wrong, make sure to fix it asap!

errors:
- id: slack
    type: io.kestra.plugin.slack.notifications.SlackIncomingWebhook
    url: "{{ secret('SLACK_WEBHOOK') }}"
    payload: |
    {
      "text": "Failure alert for flow `{{ flow.namespace }}.{{ flow.id }}` with ID `{{ execution.id }}`. Here is a bit more context about why the execution failed: `{{ errorLogs()[0]['message'] }}`"
    }
Properties

Assets this task consumes as inputs or produces as outputs, for lineage tracking and the asset graph (Enterprise Edition). A flow declaring this property on a task is rejected in the open-source edition.

Definitions
assetFailureBehaviorstring
Possible Values
IGNOREFAILWARN

Asset failure behavior

Behavior applied to the task state when a declared asset fails to render, emit, or be persisted (e.g. a lock conflict): FAIL escalates it to FAILED, WARN (default) warns it if it would otherwise succeed, IGNORE leaves the state untouched.

enableAutobooleanstring

Whether to auto-register assets referenced dynamically at runtime that are not statically declared in inputs or outputs.

inputsarray

The assets consumed as inputs.

id*string
Min length1
typestring
outputs

The assets produced as outputs.

id*string
Min length1
Max length150
type*object
descriptionstring
displayNamestring
metadataobject
Default{}
namespacestring
Min length1
Max length150
id*string
Min length1
Max length150
type*object
descriptionstring
displayNamestring
metadataobject
Default{}
namespacestring
Min length1
Max length150
id*string
Min length1
Max length150
type*object
descriptionstring
displayNamestring
metadataobject
Default{}
namespacestring
Min length1
Max length150
id*string
Min length1
Max length150
type*object
descriptionstring
displayNamestring
metadataobject
Default{}
namespacestring
Min length1
Max length150
id*string
Min length1
Max length150
type*object
descriptionstring
displayNamestring
metadataobject
Default{}
namespacestring
Min length1
Max length150
id*string
Min length1
Max length150
type*string
Min length1

Custom asset type

descriptionstring
displayNamestring
metadataobject
Default{}
namespacestring
Min length1
Max length150

Optional condition, must coerce to a boolean.

Boolean coercion allows 0, -0, and '' to coerce to false, all other values to coerce to true.

DefaultTask failure

Optional error message

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