2019-09-30 21:07:59 +05:30
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# Extra Sidekiq processes **(STARTER ONLY)**
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2019-09-30 21:07:59 +05:30
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NOTE: **Note:**
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The information in this page applies only to Omnibus GitLab.
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GitLab Starter allows one to start an extra set of Sidekiq processes
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besides the default one. These processes can be used to consume a dedicated set
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of queues. This can be used to ensure certain queues always have dedicated
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workers, no matter the number of jobs that need to be processed.
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## Available Sidekiq queues
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For a list of the existing Sidekiq queues, check the following files:
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2019-12-04 20:38:33 +05:30
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- [Queues for both GitLab Community and Enterprise Editions](https://gitlab.com/gitlab-org/gitlab/blob/master/app/workers/all_queues.yml)
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- [Queues for GitLab Enterprise Editions only](https://gitlab.com/gitlab-org/gitlab/blob/master/ee/app/workers/all_queues.yml)
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Each entry in the above files represents a queue on which extra Sidekiq processes
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can be started.
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2019-09-30 21:07:59 +05:30
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## Starting extra processes
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2019-09-30 21:07:59 +05:30
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To start extra Sidekiq processes, you must enable `sidekiq-cluster`:
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2019-09-30 21:07:59 +05:30
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1. Edit `/etc/gitlab/gitlab.rb` and add:
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2019-09-30 21:07:59 +05:30
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```ruby
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sidekiq_cluster['enable'] = true
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```
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2019-09-30 21:07:59 +05:30
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1. You will then need to specify how many additional processes to create via `sidekiq-cluster`
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and which queue they should handle via the `sidekiq_cluster['queue_groups']`
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array setting. Each item in the array equates to one additional Sidekiq
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process, and values in each item determine the queues it works on.
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For example, the following setting adds additional Sidekiq processes to two
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queues, one to `elastic_indexer` and one to `mailers`:
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2019-09-30 21:07:59 +05:30
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```ruby
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sidekiq_cluster['queue_groups'] = [
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"elastic_indexer",
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"mailers"
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]
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```
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To have an additional Sidekiq process handle multiple queues, add multiple
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queue names to its item delimited by commas. For example:
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```ruby
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sidekiq_cluster['queue_groups'] = [
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"elastic_indexer, elastic_commit_indexer",
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"mailers"
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]
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```
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2020-04-08 14:13:33 +05:30
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[In GitLab 12.9](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/26594) and
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later, the special queue name `*` means all queues. This starts two
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processes, each handling all queues:
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```ruby
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sidekiq_cluster['queue_groups'] = [
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"*",
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"*"
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]
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```
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`*` cannot be combined with concrete queue names - `*, mailers` will
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just handle the `mailers` queue.
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1. Save the file and reconfigure GitLab for the changes to take effect:
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2020-03-13 15:44:24 +05:30
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```shell
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sudo gitlab-ctl reconfigure
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```
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Once the extra Sidekiq processes are added, you can visit the
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**Admin Area > Monitoring > Background Jobs** (`/admin/background_jobs`) in GitLab.
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![Extra Sidekiq processes](img/sidekiq-cluster.png)
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2019-09-30 21:07:59 +05:30
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## Negating settings
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To have the additional Sidekiq processes work on every queue **except** the ones
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you list:
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1. After you follow the steps for [starting extra processes](#starting-extra-processes),
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edit `/etc/gitlab/gitlab.rb` and add:
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```ruby
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sidekiq_cluster['negate'] = true
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```
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1. Save the file and reconfigure GitLab for the changes to take effect:
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2020-03-13 15:44:24 +05:30
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```shell
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sudo gitlab-ctl reconfigure
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```
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2020-03-13 15:44:24 +05:30
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## Queue selector (experimental)
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> [Introduced](https://gitlab.com/gitlab-com/gl-infra/scalability/issues/45) in [GitLab Starter](https://about.gitlab.com/pricing/) 12.8.
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CAUTION: **Caution:**
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As this is marked as **experimental**, it is subject to change at any
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time, including **breaking backwards compatibility**. This is so that we
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can react to changes we need for our GitLab.com deployment. We have a
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tracking issue open to [remove the experimental
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designation](https://gitlab.com/gitlab-com/gl-infra/scalability/issues/147)
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from this feature; please comment there if you are interested in using
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this in your own deployment.
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In addition to selecting queues by name, as above, the
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`experimental_queue_selector` option allows queue groups to be selected
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in a more general way using the following components:
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- Attributes that can be selected.
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- Operators used to construct a query.
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### Available attributes
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From the [list of all available
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attributes](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/workers/all_queues.yml),
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`experimental_queue_selector` allows selecting of queues by the
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following attributes:
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- `feature_category` - the [GitLab feature
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category](https://about.gitlab.com/direction/maturity/#category-maturity) the
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queue belongs to. For example, the `merge` queue belongs to the
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`source_code_management` category.
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- `has_external_dependencies` - whether or not the queue connects to external
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services. For example, all importers have this set to `true`.
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- `urgency` - how important it is that this queue's jobs run
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quickly. Can be `high`, `low`, or `throttled`. For example, the
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`authorized_projects` queue is used to refresh user permissions, and
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is high urgency.
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- `name` - the queue name. The other attributes are typically more useful as
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they are more general, but this is available in case a particular queue needs
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to be selected.
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- `resource_boundary` - if the worker is bound by `cpu`, `memory`, or
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`unknown`. For example, the `project_export` queue is memory bound as it has
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to load data in memory before saving it for export.
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2020-04-08 14:13:33 +05:30
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`has_external_dependencies` is a boolean attribute: only the exact
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string `true` is considered true, and everything else is considered
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false.
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### Available operators
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`experimental_queue_selector` supports the following operators, listed
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from highest to lowest precedence:
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- `|` - the logical OR operator. For example, `query_a|query_b` (where `query_a`
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and `query_b` are queries made up of the other operators here) will include
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queues that match either query.
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- `&` - the logical AND operator. For example, `query_a&query_b` (where
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`query_a` and `query_b` are queries made up of the other operators here) will
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only include queues that match both queries.
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- `!=` - the NOT IN operator. For example, `feature_category!=issue_tracking`
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excludes all queues from the `issue_tracking` feature category.
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- `=` - the IN operator. For example, `resource_boundary=cpu` includes all
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queues that are CPU bound.
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- `,` - the concatenate set operator. For example,
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`feature_category=continuous_integration,pages` includes all queues from
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either the `continuous_integration` category or the `pages` category. This
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example is also possible using the OR operator, but allows greater brevity, as
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well as being lower precedence.
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The operator precedence for this syntax is fixed: it's not possible to make AND
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have higher precedence than OR.
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2020-04-08 14:13:33 +05:30
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[In GitLab 12.9](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/26594) and
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later, as with the standard queue group syntax above, a single `*` as the
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entire queue group selects all queues.
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2020-03-13 15:44:24 +05:30
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### Example queries
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In `/etc/gitlab/gitlab.rb`:
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```ruby
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sidekiq_cluster['enable'] = true
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sidekiq_cluster['experimental_queue_selector'] = true
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sidekiq_cluster['queue_groups'] = [
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# Run all non-CPU-bound queues that are high urgency
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'resource_boundary!=cpu&urgency=high',
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# Run all continuous integration and pages queues that are not high urgency
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'feature_category=continuous_integration,pages&urgency!=high',
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# Run all queues
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'*'
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]
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```
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2019-09-30 21:07:59 +05:30
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## Ignore all GitHub import queues
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When [importing from GitHub](../../user/project/import/github.md), Sidekiq might
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use all of its resources to perform those operations. To set up a separate
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`sidekiq-cluster` process to ignore all GitHub import-related queues:
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2019-07-31 22:56:46 +05:30
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1. Edit `/etc/gitlab/gitlab.rb` and add:
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```ruby
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sidekiq_cluster['enable'] = true
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sidekiq_cluster['negate'] = true
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sidekiq_cluster['queue_groups'] = [
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"github_import_advance_stage",
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"github_importer:github_import_import_diff_note",
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"github_importer:github_import_import_issue",
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"github_importer:github_import_import_note",
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"github_importer:github_import_import_lfs_object",
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"github_importer:github_import_import_pull_request",
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"github_importer:github_import_refresh_import_jid",
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"github_importer:github_import_stage_finish_import",
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"github_importer:github_import_stage_import_base_data",
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"github_importer:github_import_stage_import_issues_and_diff_notes",
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"github_importer:github_import_stage_import_notes",
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"github_importer:github_import_stage_import_lfs_objects",
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"github_importer:github_import_stage_import_pull_requests",
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"github_importer:github_import_stage_import_repository"
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]
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```
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2019-09-30 21:07:59 +05:30
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1. Save the file and reconfigure GitLab for the changes to take effect:
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2020-03-13 15:44:24 +05:30
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```shell
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sudo gitlab-ctl reconfigure
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```
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2019-07-31 22:56:46 +05:30
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2019-09-30 21:07:59 +05:30
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## Number of threads
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Each process defined under `sidekiq_cluster` starts with a
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number of threads that equals the number of queues, plus one spare thread.
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For example, a process that handles the `process_commit` and `post_receive`
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queues will use three threads in total.
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2020-03-13 15:44:24 +05:30
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## Managing concurrency
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When setting the maximum concurrency, keep in mind this normally should
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not exceed the number of CPU cores available. The values in the examples
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below are arbitrary and not particular recommendations.
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2020-03-13 15:44:24 +05:30
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Each thread requires a Redis connection, so adding threads may increase Redis
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latency and potentially cause client timeouts. See the [Sidekiq documentation
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about Redis](https://github.com/mperham/sidekiq/wiki/Using-Redis) for more
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details.
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### When running a single Sidekiq process (default)
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1. Edit `/etc/gitlab/gitlab.rb` and add:
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```ruby
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sidekiq['concurrency'] = 25
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```
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1. Save the file and reconfigure GitLab for the changes to take effect:
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2020-03-13 15:44:24 +05:30
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```shell
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sudo gitlab-ctl reconfigure
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```
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2020-03-13 15:44:24 +05:30
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This will set the concurrency (number of threads) for the Sidekiq process.
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### When running Sidekiq cluster
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1. Edit `/etc/gitlab/gitlab.rb` and add:
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```ruby
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sidekiq_cluster['min_concurrency'] = 15
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sidekiq_cluster['max_concurrency'] = 25
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```
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2019-09-30 21:07:59 +05:30
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1. Save the file and reconfigure GitLab for the changes to take effect:
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2020-03-13 15:44:24 +05:30
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```shell
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sudo gitlab-ctl reconfigure
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```
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2019-07-31 22:56:46 +05:30
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2020-03-13 15:44:24 +05:30
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`min_concurrency` and `max_concurrency` are independent; one can be set without
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the other. Setting `min_concurrency` to 0 will disable the limit.
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2020-03-13 15:44:24 +05:30
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For each queue group, let N be one more than the number of queues. The
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concurrency factor will be set to:
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1. `N`, if it's between `min_concurrency` and `max_concurrency`.
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1. `max_concurrency`, if `N` exceeds this value.
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1. `min_concurrency`, if `N` is less than this value.
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If `min_concurrency` is equal to `max_concurrency`, then this value will be used
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regardless of the number of queues.
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When `min_concurrency` is greater than `max_concurrency`, it is treated as
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being equal to `max_concurrency`.
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## Modifying the check interval
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2019-07-31 22:56:46 +05:30
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To modify the check interval for the additional Sidekiq processes:
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1. Edit `/etc/gitlab/gitlab.rb` and add:
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```ruby
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sidekiq_cluster['interval'] = 5
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```
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1. Save the file and [reconfigure GitLab](../restart_gitlab.md#omnibus-gitlab-reconfigure) for the changes to take effect.
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This tells the additional processes how often to check for enqueued jobs.
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## Troubleshooting using the CLI
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CAUTION: **Warning:**
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It's recommended to use `/etc/gitlab/gitlab.rb` to configure the Sidekiq processes.
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If you experience a problem, you should contact GitLab support. Use the command
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line at your own risk.
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For debugging purposes, you can start extra Sidekiq processes by using the command
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`/opt/gitlab/embedded/service/gitlab-rails/bin/sidekiq-cluster`. This command
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takes arguments using the following syntax:
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```shell
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/opt/gitlab/embedded/service/gitlab-rails/bin/sidekiq-cluster [QUEUE,QUEUE,...] [QUEUE, ...]
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```
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Each separate argument denotes a group of queues that have to be processed by a
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Sidekiq process. Multiple queues can be processed by the same process by
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separating them with a comma instead of a space.
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Instead of a queue, a queue namespace can also be provided, to have the process
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automatically listen on all queues in that namespace without needing to
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explicitly list all the queue names. For more information about queue namespaces,
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see the relevant section in the
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[Sidekiq style guide](../../development/sidekiq_style_guide.md#queue-namespaces).
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For example, say you want to start 2 extra processes: one to process the
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`process_commit` queue, and one to process the `post_receive` queue. This can be
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done as follows:
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```shell
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/opt/gitlab/embedded/service/gitlab-rails/bin/sidekiq-cluster process_commit post_receive
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```
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If you instead want to start one process processing both queues, you'd use the
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following syntax:
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```shell
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/opt/gitlab/embedded/service/gitlab-rails/bin/sidekiq-cluster process_commit,post_receive
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```
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If you want to have one Sidekiq process dealing with the `process_commit` and
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`post_receive` queues, and one process to process the `gitlab_shell` queue,
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you'd use the following:
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```shell
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/opt/gitlab/embedded/service/gitlab-rails/bin/sidekiq-cluster process_commit,post_receive gitlab_shell
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```
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### Monitoring the `sidekiq-cluster` command
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The `sidekiq-cluster` command will not terminate once it has started the desired
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amount of Sidekiq processes. Instead, the process will continue running and
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forward any signals to the child processes. This makes it easy to stop all
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Sidekiq processes as you simply send a signal to the `sidekiq-cluster` process,
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instead of having to send it to the individual processes.
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If the `sidekiq-cluster` process crashes or receives a `SIGKILL`, the child
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processes will terminate themselves after a few seconds. This ensures you don't
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end up with zombie Sidekiq processes.
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All of this makes monitoring the processes fairly easy. Simply hook up
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`sidekiq-cluster` to your supervisor of choice (e.g. runit) and you're good to
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go.
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If a child process died the `sidekiq-cluster` command will signal all remaining
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process to terminate, then terminate itself. This removes the need for
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`sidekiq-cluster` to re-implement complex process monitoring/restarting code.
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Instead you should make sure your supervisor restarts the `sidekiq-cluster`
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process whenever necessary.
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### PID files
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The `sidekiq-cluster` command can store its PID in a file. By default no PID
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file is written, but this can be changed by passing the `--pidfile` option to
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`sidekiq-cluster`. For example:
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```shell
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/opt/gitlab/embedded/service/gitlab-rails/bin/sidekiq-cluster --pidfile /var/run/gitlab/sidekiq_cluster.pid process_commit
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```
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Keep in mind that the PID file will contain the PID of the `sidekiq-cluster`
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command and not the PID(s) of the started Sidekiq processes.
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### Environment
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The Rails environment can be set by passing the `--environment` flag to the
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`sidekiq-cluster` command, or by setting `RAILS_ENV` to a non-empty value. The
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default value can be found in `/opt/gitlab/etc/gitlab-rails/env/RAILS_ENV`.
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