Commit e7b36a1f authored by Evan Read's avatar Evan Read Committed by Achilleas Pipinellis

Clarify limits for needs keyword

parent 8326e84e
......@@ -1801,7 +1801,8 @@ and bring back the old behavior.
### `needs`
> Introduced in GitLab 12.2.
> - Introduced in GitLab 12.2.
> - In GitLab 12.3, maximum number of jobs in `needs` array raised from five to 50.
The `needs:` keyword enables executing jobs out-of-order, allowing you to implement
a [directed acyclic graph](../directed_acyclic_graph/index.md) in your `.gitlab-ci.yml`.
......@@ -1852,30 +1853,26 @@ This example creates three paths of execution:
#### Requirements and limitations
1. If `needs:` is set to point to a job that is not instantiated
because of `only/except` rules or otherwise does not exist, the
job will fail.
1. Note that on day one of the launch, we are temporarily limiting the
maximum number of jobs that a single job can need in the `needs:` array. Track
our [infrastructure issue](https://gitlab.com/gitlab-com/gl-infra/infrastructure/issues/7541)
for details on the current limit.
1. If you use `dependencies:` with `needs:`, it's important that you
do not mark a job as having a dependency on something that won't
have been run at the time it needs it. It's better to use both
keywords in this case so that GitLab handles the ordering appropriately.
1. It is impossible for now to have `needs: []` (empty needs),
the job always needs to depend on something, unless this is the job
in the first stage (see [gitlab-ce#65504](https://gitlab.com/gitlab-org/gitlab-ce/issues/65504)).
1. If `needs:` refers to a job that is marked as `parallel:`.
the current job will depend on all parallel jobs created.
1. `needs:` is similar to `dependencies:` in that it needs to use jobs from
prior stages, meaning it is impossible to create circular
dependencies or depend on jobs in the current stage (see [gitlab-ce#65505](https://gitlab.com/gitlab-org/gitlab-ce/issues/65505)).
1. Related to the above, stages must be explicitly defined for all jobs
that have the keyword `needs:` or are referred to by one.
1. For self-managed users, the feature must be turned on using the `ci_dag_support`
feature flag. The `ci_dag_limit_needs` option, if set, will limit the number of
jobs that a single job can need to `50`. If unset, the limit is `5`.
- If `needs:` is set to point to a job that is not instantiated
because of `only/except` rules or otherwise does not exist, the
pipeline will be created with YAML error.
- We are temporarily limiting the maximum number of jobs that a single job can
need in the `needs:` array:
- For GitLab.com, the limit is five. For more information, see our
[infrastructure issue](https://gitlab.com/gitlab-com/gl-infra/infrastructure/issues/7541).
- For self-managed instances, the limit is:
- Five by default (`ci_dag_limit_needs` feature flag is enabled).
- 50 if the `ci_dag_limit_needs` feature flag is disabled.
- It is impossible for now to have `needs: []` (empty needs),
the job always needs to depend on something, unless this is the job
in the first stage (see [gitlab-ce#65504](https://gitlab.com/gitlab-org/gitlab-ce/issues/65504)).
- If `needs:` refers to a job that is marked as `parallel:`.
the current job will depend on all parallel jobs created.
- `needs:` is similar to `dependencies:` in that it needs to use jobs from
prior stages, meaning it is impossible to create circular
dependencies or depend on jobs in the current stage (see [gitlab-ce#65505](https://gitlab.com/gitlab-org/gitlab-ce/issues/65505)).
- Related to the above, stages must be explicitly defined for all jobs
that have the keyword `needs:` or are referred to by one.
### `coverage`
......
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