Matrix

Overview

Matrix is used to fan out Tasks in a Pipeline. This doc will explain the details of matrix support in Tekton.

Documentation for specifying Matrix in a Pipeline:

🌱 Matrix is an beta feature. The enable-api-fields feature flag can be set to "beta" to specify Matrix in a PipelineTask.

Configuring a Matrix

A Matrix allows you to generate combinations and specify explicit combinations to fan out a PipelineTask.

Generating Combinations

The Matrix.Params is used to generate combinations to fan out a PipelineTask.

    matrix:
      params:
        - name: platform
          value:
          - linux
          - mac
        - name: browser
          value:
          - safari
          - chrome
  ...

Combinations generated

{ "platform": "linux", "browser": "safari" }
{ "platform": "linux", "browser": "chrome"}
{ "platform": "mac", "browser": "safari" }
{ "platform": "mac", "browser": "chrome"}

See another example

Explicit Combinations

The Matrix.Include is used to add explicit combinations to fan out a PipelineTask.

    matrix:
      params:
        - name: platform
          value:
          - linux
          - mac
        - name: browser
          value:
          - safari
          - chrome
      include:
        - name: linux-url
          params:
            - name: platform
              value: linux
            - name: url
              value: some-url
        - name: non-existent-browser
          params:
            - name: browser
              value: "i-do-not-exist"
  ...

The first Matrix.Include clause adds "url": "some-url" only to the original matrix combinations that include "platform": "linux" and the second Matrix.Include clause cannot be added to any original matrix combination without overwriting any params of the original combinations, so it is added as an additional matrix combination:

Combinations generated

{ "platform": "linux", "browser": "safari", "url": "some-url" }
{ "platform": "linux", "browser": "chrome", "url": "some-url"}
{ "platform": "mac", "browser": "safari" }
{ "platform": "mac", "browser": "chrome"}
{ "browser": "i-do-not-exist"}

See another example

The Matrix.Include can also be used without Matrix.Params to generate explicit combinations to fan out a PipelineTask.

    matrix:
        include:
          - name: build-1
            params:
              - name: IMAGE
                value: "image-1"
              - name: DOCKERFILE
                value: "path/to/Dockerfile1"
          - name: build-2
            params:
              - name: IMAGE
                value: "image-2"
              - name: DOCKERFILE
                value: "path/to/Dockerfile2"
          - name: build-3
            params:
              - name: IMAGE
                value: "image-3"
              - name: DOCKERFILE
                value: "path/to/Dockerfile3"
  ...

This configuration allows users to take advantage of Matrix to fan out without having an auto-populated Matrix. Matrix with include section without Params section creates the number of TaskRuns specified in the Include section with the specified Parameters.

Combinations generated

{ "IMAGE": "image-1", "DOCKERFILE": "path/to/Dockerfile1" }
{ "IMAGE": "image-2", "DOCKERFILE": "path/to/Dockerfile2"}
{ "IMAGE": "image-3", "DOCKERFILE": "path/to/Dockerfile3}

Concurrency Control

The default maximum count of TaskRuns or Runs from a given Matrix is 256. To customize the maximum count of TaskRuns or Runs generated from a given Matrix, configure the default-max-matrix-combinations-count in config defaults. When a Matrix in PipelineTask would generate more than the maximum TaskRuns or Runs, the Pipeline validation would fail.

Note: The matrix combination count includes combinations generated from both Matrix.Params and Matrix.Include.Params.

apiVersion: v1
kind: ConfigMap
metadata:
  name: config-defaults
data:
  default-service-account: "tekton"
  default-timeout-minutes: "20"
  default-max-matrix-combinations-count: "1024"
  ...

For more information, see installation customizations.

Parameters

Matrix takes in Parameters in two sections:

  • Matrix.Params: used to generate combinations to fan out the PipelineTask.
  • Matrix.Include.Params: used to specify specific combinations to fan out the PipelineTask.

Note that:

  • The names of the Parameters in the Matrix must match the names of the Parameters in the underlying Task that they will be substituting.
  • The names of the Parameters in the Matrix must be unique. Specifying the same parameter multiple times will result in a validation error.
  • A Parameter can be passed to either the matrix or params field, not both.
  • If the Matrix has an empty array Parameter, then the PipelineTask will be skipped.

For further details on specifying Parameters in the Pipeline and passing them to PipelineTasks, see documentation.

Parameters in Matrix.Params

Matrix.Params supports string replacements from Parameters of type String, Array or Object.

tasks:
...
- name: task-4
  taskRef:
    name: task-4
  matrix:
    params:
    - name: param-one
      value:
      - $(params.foo) # string replacement from string param
      - $(params.bar[0]) # string replacement from array param
      - $(params.rad.key) # string replacement from object param
    - name: param-two
      value: $(params.bar) # array replacement from array param

Matrix.Params supports whole array replacements from array Parameters.

tasks:
...
- name: task-4
  taskRef:
    name: task-4
  matrix:
    params:
    - name: param-one
      value: $(params.bar[*]) # whole array replacement from array param

Parameters in Matrix.Include.Params

Matrix.Include.Params takes string replacements from Parameters of type String, Array or Object.

tasks:
...
- name: task-4
  taskRef:
    name: task-4
  matrix:
    include:
      - name: foo-bar-rad
        params:
        - name: foo
          value: $(params.foo) # string replacement from string param
        - name: bar
          value: $(params.bar[0]) # string replacement from array param
        - name: rad
          value: $(params.rad.key) # string replacement from object param

Specifying both params and matrix in a PipelineTask

In the example below, the test Task takes browser and platform Parameters of type "string". A Pipeline used to run the Task on three browsers (using matrix) and one platform (using params) would be specified as such and execute three TaskRuns:

apiVersion: tekton.dev/v1beta1
kind: Pipeline
metadata:
  name: platform-browser-tests
spec:
  tasks:
  - name: fetch-repository
    taskRef:
      name: git-clone
    ...
  - name: test
    matrix:
      params:
        - name: browser
          value:
            - chrome
            - safari
            - firefox
    params:
      - name: platform
        value: linux
    taskRef:
      name: browser-test
  ...

Context Variables

Similarly to the Parameters in the Params field, the Parameters in the Matrix field will accept context variables that will be substituted, including:

  • PipelineRun name, namespace and uid
  • Pipeline name
  • PipelineTask retries

The following context variables allow users to access the matrix runtime data. Note: In order to create an ordering dependency, use runAfter or taskResult consumption as part of the same pipelineTask.

Access Matrix Combinations Length

The pipeline authors can access the total number of instances created as part of the matrix using the syntax: tasks.<pipelineTaskName>.matrix.length.

      - name: matrixed-echo-length
        runAfter:
          - matrix-emitting-results
        params:
          - name: matrixlength
            value: $(tasks.matrix-emitting-results.matrix.length)

Access Aggregated Results Length

The pipeline authors can access the length of the array of aggregated results that were actually produced using the syntax: tasks.<pipelineTaskName>.matrix.<resultName>.length. This will allow users to loop over the results produced.

      - name: matrixed-echo-results-length
        runAfter:
          - matrix-emitting-results
        params:
          - name: matrixlength
            value: $(tasks.matrix-emitting-results.matrix.a-result.length)

See the full example here: pr-with-matrix-context-variables

Results

Specifying Results in a Matrix

Consuming Results from previous TaskRuns or Runs in a Matrix, which would dynamically generate TaskRuns or Runs from the fanned out PipelineTask, is supported. Producing Results in from a PipelineTask with a Matrix is not yet supported - see further details.

See the end-to-end example in PipelineRun with Matrix and Results.

Results in Matrix.Params

Matrix.Params supports whole array replacements and string replacements from Results of type String, Array or Object

tasks:
...
- name: task-4
  taskRef:
    name: task-4
  matrix:
    params:
    - name: values
      value: $(tasks.task-4.results.whole-array[*])

tasks:
...
- name: task-5
  taskRef:
    name: task-5
  matrix:
    params:
    - name: values
      value:
        - $(tasks.task-1.results.a-string-result)
        - $(tasks.task-2.results.an-array-result[0])
        - $(tasks.task-3.results.an-object-result.key)

For further information, see the example in PipelineRun with Matrix and Results.

Results in Matrix.Include.Params

Matrix.Include.Params supports string replacements from Results of type String, Array or Object.

tasks:
...
- name: task-4
  taskRef:
    name: task-4
  matrix:
    include:
      - name: foo-bar-duh
      params:
        - name: foo
          value: $(tasks.task-1.results.foo) # string replacement from string result
        - name: bar
          value: $(tasks.task-2.results.bar[0]) # string replacement from array result
        - name: duh
          value: $(tasks.task-2.results.duh.key) # string replacement from object result

Results from fanned out Matrixed PipelineTasks

Emitting Results from fanned out PipelineTasks is now supported. Each fanned out TaskRun that produces Result of type string will be aggregated into an array of Results during reconciliation, in which the whole array of Results can be consumed by another pipelineTask using the star notion [*]. Note: A known limitation is not being able to consume a singular result or specific combinations of results produced by a previous fanned out PipelineTask.

Result Type in taskRef or taskSpec Parameter Type of Consumer Specification
string array $(tasks.<pipelineTaskName>.results.<resultName>[*])
array Not Supported Not Supported
object Not Supported Not Supported 
apiVersion: tekton.dev/v1beta1
kind: Pipeline
metadata:
  name: platform-browser-tests
spec:
  tasks:
    - name: matrix-emitting-results
        matrix:
          params:
            - name: platform
              value:
                - linux
                - mac
                - windows
            - name: browser
              value:
                - chrome
                - safari
                - firefox
        taskRef:
          name: taskwithresults
          kind: Task
      - name: task-consuming-results
        taskRef:
          name: echoarrayurl
          kind: Task
        params:
          - name: url
            value: $(tasks.matrix-emitting-results.results.report-url[*])
  ...

See the full example pr-with-matrix-emitting-results

Retries

The retries field is used to specify the number of times a PipelineTask should be retried when its TaskRun or Run fails, see the documentation for further details. When a PipelineTask is fanned out using Matrix, a given TaskRun or Run executed will be retried as much as the field in the retries field of the PipelineTask.

For example, the PipelineTask in this PipelineRun will be fanned out into three TaskRuns each of which will be retried once:

apiVersion: tekton.dev/v1beta1
kind: PipelineRun
metadata:
  generateName: matrixed-pr-with-retries-
spec:
  pipelineSpec:
    tasks:
      - name: matrix-and-params
        matrix:
          params:
            - name: platform
              value:
                - linux
                - mac
                - windows
        params:
          - name: browser
            value: chrome
        retries: 1
        taskSpec:
          params:
            - name: platform
            - name: browser
          steps:
            - name: echo
              image: alpine
              script: |
                echo "$(params.platform) and $(params.browser)"
                exit 1

Examples

Matrix Combinations with Matrix.Params only

matrix:
  params:
    - name: GOARCH
      value:
        - "linux/amd64"
        - "linux/ppc64le"
        - "linux/s390x"
    - name: version
      value:
        - "go1.17"
        - "go1.18.1"

This matrix specification will result in six taskRuns with the following matrix combinations:

{ "GOARCH": "linux/amd64", "version": "go1.17" }
{ "GOARCH": "linux/amd64", "version": "go1.18.1" }
{ "GOARCH": "linux/ppc64le", "version": "go1.17" }
{ "GOARCH": "linux/ppc64le", "version": "go1.18.1" }
{ "GOARCH": "linux/s390x", "version": "go1.17" }
{ "GOARCH": "linux/s390x", "version": "go1.18.1" }

Let’s expand this use case to showcase a little more complex combinations in the next example.

Matrix Combinations with Matrix.Params and Matrix.Include

Now, let’s introduce include with a couple of Parameters: "package", "flags" and "context":

      matrix:
        params:
          - name: GOARCH
            value:
              - "linux/amd64"
              - "linux/ppc64le"
              - "linux/s390x"
          - name: version
            value:
              - "go1.17"
              - "go1.18.1"
        include:
          - name: common-package
            params:
              - name: package
                value: "path/to/common/package/"
          - name: s390x-no-race
            params:
              - name: GOARCH
                value: "linux/s390x"
              - name: flags
                value: "-cover -v"

          - name: go117-context
            params:
              - name: version
                value: "go1.17"
              - name: context
                value: "path/to/go117/context"
          - name: non-existent-arch
            params:
                - name: GOARCH
                  value: "I-do-not-exist"

The first include clause is added to all the original matrix combintations without overwriting any parameters of the original combinations:

{ "GOARCH": "linux/amd64", "version": "go1.17", **"package": "path/to/common/package/"** }
{ "GOARCH": "linux/amd64", "version": "go1.18.1", **"package": "path/to/common/package/"** }
{ "GOARCH": "linux/ppc64le", "version": "go1.17", **"package": "path/to/common/package/"** }
{ "GOARCH": "linux/ppc64le", "version": "go1.18.1", **"package": "path/to/common/package/"** }
{ "GOARCH": "linux/s390x", "version": "go1.17", **"package": "path/to/common/package/"** }
{ "GOARCH": "linux/s390x", "version": "go1.18.1", **"package": "path/to/common/package/"** }

The second include clause adds "flags": "-cover -v" only to the original matrix combinations that include "GOARCH": "linux/s390x":

{ "GOARCH": "linux/s390x", "version": "go1.17", "package": "path/to/common/package/", **"flags": "-cover -v"** }
{ "GOARCH": "linux/s390x", "version": "go1.18.1", "package": "path/to/common/package/", **"flags": "-cover -v"** }

The third include clause adds "context": "path/to/go117/context" only to the original matrix combinations that include "version": "go1.17":

{ "GOARCH": "linux/amd64", "version": "go1.17", "package": "path/to/common/package/", **"context": "path/to/go117/context"** }
{ "GOARCH": "linux/ppc64le", "version": "go1.17", "package": "path/to/common/package/", **"context": "path/to/go117/context"** }
{ "GOARCH": "linux/s390x", "version": "go1.17", "package": "path/to/common/package/", "flags": "-cover -v", **"context": "path/to/go117/context"** }

The fourth include clause cannot be added to any original matrix combination without overwriting any params of the original combinations, so it is added as an additional matrix combination:

* { **"GOARCH": "I-do-not-exist"** }

The above specification will result in seven taskRuns with the following matrix combinations:

{ "GOARCH": "linux/amd64", "version": "go1.17", "package": "path/to/common/package/", "context": "path/to/go117/context" }
{ "GOARCH": "linux/amd64", "version": "go1.18.1", "package": "path/to/common/package/" }
{ "GOARCH": "linux/ppc64le", "version": "go1.17", "package": "path/to/common/package/", "context": "path/to/go117/context" }
{ "GOARCH": "linux/ppc64le", "version": "go1.18.1", "package": "path/to/common/package/" }
{ "GOARCH": "linux/s390x", "version": "go1.17", "package": "path/to/common/package/", "flags": "-cover -v", "context": "path/to/go117/context" }
{ "GOARCH": "linux/s390x", "version": "go1.18.1", "package": "path/to/common/package/", "flags": "-cover -v" }
{ "GOARCH": "I-do-not-exist" }

PipelineTasks with Tasks

When a PipelineTask has a Task and a Matrix, the Task will be executed in parallel TaskRuns with substitutions from combinations of Parameters.

In the example below, nine TaskRuns are created with combinations of platforms (“linux”, “mac”, “windows”) and browsers (“chrome”, “safari”, “firefox”).

apiVersion: tekton.dev/v1beta1
kind: Task
metadata:
  name: platform-browsers
  annotations:
    description: |
            A task that does something cool with platforms and browsers
spec:
  params:
    - name: platform
    - name: browser
  steps:
    - name: echo
      image: alpine
      script: |
                echo "$(params.platform) and $(params.browser)"
---
# run platform-browsers task with:
#   platforms: linux, mac, windows
#   browsers: chrome, safari, firefox
apiVersion: tekton.dev/v1beta1
kind: PipelineRun
metadata:
  generateName: matrixed-pr-
spec:
  serviceAccountName: 'default'
  pipelineSpec:
    tasks:
      - name: platforms-and-browsers
        matrix:
          params:
            - name: platform
              value:
                - linux
                - mac
                - windows
            - name: browser
              value:
                - chrome
                - safari
                - firefox
        taskRef:
          name: platform-browsers

When the above PipelineRun is executed, these are the TaskRuns that are created:

$ tkn taskruns list

NAME                                         STARTED        DURATION     STATUS
matrixed-pr-6lvzk-platforms-and-browsers-8   11 seconds ago   7 seconds    Succeeded
matrixed-pr-6lvzk-platforms-and-browsers-6   12 seconds ago   7 seconds    Succeeded
matrixed-pr-6lvzk-platforms-and-browsers-7   12 seconds ago   9 seconds    Succeeded
matrixed-pr-6lvzk-platforms-and-browsers-4   12 seconds ago   7 seconds    Succeeded
matrixed-pr-6lvzk-platforms-and-browsers-5   12 seconds ago   6 seconds    Succeeded
matrixed-pr-6lvzk-platforms-and-browsers-3   13 seconds ago   7 seconds    Succeeded
matrixed-pr-6lvzk-platforms-and-browsers-1   13 seconds ago   8 seconds    Succeeded
matrixed-pr-6lvzk-platforms-and-browsers-2   13 seconds ago   8 seconds    Succeeded
matrixed-pr-6lvzk-platforms-and-browsers-0   13 seconds ago   8 seconds    Succeeded

When the above Pipeline is executed, its status is populated with ChildReferences of the above TaskRuns. The PipelineRun status tracks the status of all the fanned out TaskRuns. This is the PipelineRun after completing successfully:

apiVersion: tekton.dev/v1beta1
kind: PipelineRun
metadata:
  generateName: matrixed-pr-
  labels:
    tekton.dev/pipeline: matrixed-pr-6lvzk
  name: matrixed-pr-6lvzk
  namespace: default
spec:
  pipelineSpec:
    tasks:
    - matrix:
        params:
          - name: platform
            value:
              - linux
              - mac
              - windows
          - name: browser
              value:
                - chrome
                - safari
                - firefox
      name: platforms-and-browsers
      taskRef:
        kind: Task
        name: platform-browsers
  serviceAccountName: default
  timeout: 1h0m0s
status:
  pipelineSpec:
    tasks:
      - matrix:
          params:
            - name: platform
              value:
                - linux
                - mac
                - windows
            - name: browser
              value:
                - chrome
                - safari
                - firefox
        name: platforms-and-browsers
        taskRef:
          kind: Task
          name: platform-browsers
  startTime: "2022-06-23T23:01:11Z"
  completionTime: "2022-06-23T23:01:20Z"
  conditions:
    - lastTransitionTime: "2022-06-23T23:01:20Z"
      message: 'Tasks Completed: 1 (Failed: 0, Cancelled 0), Skipped: 0'
      reason: Succeeded
      status: "True"
      type: Succeeded
  childReferences:
  - apiVersion: tekton.dev/v1beta1
    kind: TaskRun
    name: matrixed-pr-6lvzk-platforms-and-browsers-4
    pipelineTaskName: platforms-and-browsers
  - apiVersion: tekton.dev/v1beta1
    kind: TaskRun
    name: matrixed-pr-6lvzk-platforms-and-browsers-6
    pipelineTaskName: platforms-and-browsers
  - apiVersion: tekton.dev/v1beta1
    kind: TaskRun
    name: matrixed-pr-6lvzk-platforms-and-browsers-2
    pipelineTaskName: platforms-and-browsers
  - apiVersion: tekton.dev/v1beta1
    kind: TaskRun
    name: matrixed-pr-6lvzk-platforms-and-browsers-1
    pipelineTaskName: platforms-and-browsers
  - apiVersion: tekton.dev/v1beta1
    kind: TaskRun
    name: matrixed-pr-6lvzk-platforms-and-browsers-7
    pipelineTaskName: platforms-and-browsers
  - apiVersion: tekton.dev/v1beta1
    kind: TaskRun
    name: matrixed-pr-6lvzk-platforms-and-browsers-0
    pipelineTaskName: platforms-and-browsers
  - apiVersion: tekton.dev/v1beta1
    kind: TaskRun
    name: matrixed-pr-6lvzk-platforms-and-browsers-8
    pipelineTaskName: platforms-and-browsers
  - apiVersion: tekton.dev/v1beta1
    kind: TaskRun
    name: matrixed-pr-6lvzk-platforms-and-browsers-3
    pipelineTaskName: platforms-and-browsers
  - apiVersion: tekton.dev/v1beta1
    kind: TaskRun
    name: matrixed-pr-6lvzk-platforms-and-browsers-5
    pipelineTaskName: platforms-and-browsers

To execute this example yourself, run PipelineRun with Matrix.

PipelineTasks with Custom Tasks

When a PipelineTask has a Custom Task and a Matrix, the Custom Task will be executed in parallel Runs with substitutions from combinations of Parameters.

In the example below, eight Runs are created with combinations of CEL expressions, using the CEL Custom Task.

apiVersion: tekton.dev/v1beta1
kind: PipelineRun
metadata:
  generateName: matrixed-pr-
spec:
  serviceAccountName: 'default'
  pipelineSpec:
    tasks:
      - name: platforms-and-browsers
        matrix:
          params:
            - name: type
              value:
                - "type(1)"
                - "type(1.0)"
            - name: colors
              value:
                - "{'blue': '0x000080', 'red': '0xFF0000'}['blue']"
                - "{'blue': '0x000080', 'red': '0xFF0000'}['red']"
            - name: bool
              value:
                - "type(1) == int"
                - "{'blue': '0x000080', 'red': '0xFF0000'}['red'] == '0xFF0000'"
        taskRef:
          apiVersion: cel.tekton.dev/v1alpha1
          kind: CEL

When the above PipelineRun is executed, these Runs are created:

$ k get run.tekton.dev

NAME                                         SUCCEEDED   REASON              STARTTIME   COMPLETIONTIME
matrixed-pr-4djw9-platforms-and-browsers-0   True        EvaluationSuccess   10s         10s
matrixed-pr-4djw9-platforms-and-browsers-1   True        EvaluationSuccess   10s         10s
matrixed-pr-4djw9-platforms-and-browsers-2   True        EvaluationSuccess   10s         10s
matrixed-pr-4djw9-platforms-and-browsers-3   True        EvaluationSuccess   9s          9s
matrixed-pr-4djw9-platforms-and-browsers-4   True        EvaluationSuccess   9s          9s
matrixed-pr-4djw9-platforms-and-browsers-5   True        EvaluationSuccess   9s          9s
matrixed-pr-4djw9-platforms-and-browsers-6   True        EvaluationSuccess   9s          9s
matrixed-pr-4djw9-platforms-and-browsers-7   True        EvaluationSuccess   9s          9s

When the above PipelineRun is executed, its status is populated with ChildReferences of the above Runs. The PipelineRun status tracks the status of all the fanned out Runs. This is the PipelineRun after completing:

apiVersion: tekton.dev/v1beta1
kind: PipelineRun
metadata:
  generateName: matrixed-pr-
  labels:
    tekton.dev/pipeline: matrixed-pr-4djw9
  name: matrixed-pr-4djw9
  namespace: default
spec:
  pipelineSpec:
    tasks:
      - matrix:
          params:
            - name: type
              value:
                - type(1)
                - type(1.0)
            - name: colors
              value:
                - '{''blue'': ''0x000080'', ''red'': ''0xFF0000''}[''blue'']'
                - '{''blue'': ''0x000080'', ''red'': ''0xFF0000''}[''red'']'
            - name: bool
              value:
                - type(1) == int
                - '{''blue'': ''0x000080'', ''red'': ''0xFF0000''}[''red''] == ''0xFF0000'''
        name: platforms-and-browsers
        taskRef:
          apiVersion: cel.tekton.dev/v1alpha1
          kind: CEL
  serviceAccountName: default
  timeout: 1h0m0s
status:
  pipelineSpec:
    tasks:
      - matrix:
          params:
            - name: type
              value:
                - type(1)
                - type(1.0)
            - name: colors
              value:
                - '{''blue'': ''0x000080'', ''red'': ''0xFF0000''}[''blue'']'
                - '{''blue'': ''0x000080'', ''red'': ''0xFF0000''}[''red'']'
            - name: bool
              value:
                - type(1) == int
                - '{''blue'': ''0x000080'', ''red'': ''0xFF0000''}[''red''] == ''0xFF0000'''
        name: platforms-and-browsers
        taskRef:
          apiVersion: cel.tekton.dev/v1alpha1
          kind: CEL
  startTime: "2022-06-28T20:49:40Z"
  completionTime: "2022-06-28T20:49:41Z"
  conditions:
    - lastTransitionTime: "2022-06-28T20:49:41Z"
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