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author | Lin Jen-Shin <godfat@godfat.org> | 2017-11-06 21:44:57 +0800 |
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committer | Lin Jen-Shin <godfat@godfat.org> | 2017-11-06 21:44:57 +0800 |
commit | fc6aad0b4442c58fde1ac924cb2dd73823273537 (patch) | |
tree | 3f4a46a5b649cf623ab5e8e42eaa2e06cb2b20cf /doc/development/background_migrations.md | |
parent | 239332eed3fa870fd41be83864882c0f389840d8 (diff) | |
parent | cfc932cad10b1d6c494222e9d91aa75583b56145 (diff) | |
download | gitlab-ce-fc6aad0b4442c58fde1ac924cb2dd73823273537.tar.gz |
Merge remote-tracking branch 'upstream/master' into no-ivar-in-modules
* upstream/master: (1723 commits)
Resolve "Editor icons"
Refactor issuable destroy action
Ignore routes matching legacy_*_redirect in route specs
Gitlab::Git::RevList and LfsChanges use lazy popen
Gitlab::Git::Popen can lazily hand output to a block
Merge branch 'master-i18n' into 'master'
Remove unique validation from external_url in Environment
Expose `duration` in Job API entity
Add TimeCop freeze for DST and Regular time
Harcode project visibility
update a changelog
Put a condition to old migration that adds fast_forward column to MRs
Expose project visibility as CI variable
fix flaky tests by removing unneeded clicks and focus actions
fix flaky test in gfm_autocomplete_spec.rb
Use Gitlab::Git operations for repository mirroring
Encapsulate git operations for mirroring in Gitlab::Git
Create a Wiki Repository's raw_repository properly
Add `Gitlab::Git::Repository#fetch` command
Fix Gitlab::Metrics::System#real_time and #monotonic_time doc
...
Diffstat (limited to 'doc/development/background_migrations.md')
-rw-r--r-- | doc/development/background_migrations.md | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/doc/development/background_migrations.md b/doc/development/background_migrations.md index f83a60e49e8..5452b0e7a2f 100644 --- a/doc/development/background_migrations.md +++ b/doc/development/background_migrations.md @@ -215,14 +215,29 @@ same time will ensure that both existing and new data is migrated. In the next release we can remove the `after_commit` hooks and related code. We will also need to add a post-deployment migration that consumes any remaining -jobs. Such a migration would look like this: +jobs and manually run on any un-migrated rows. Such a migration would look like +this: ```ruby class ConsumeRemainingExtractServicesUrlJobs < ActiveRecord::Migration disable_ddl_transaction! + class Service < ActiveRecord::Base + include ::EachBatch + + self.table_name = 'services' + end + def up + # This must be included Gitlab::BackgroundMigration.steal('ExtractServicesUrl') + + # This should be included, but can be skipped - see below + Service.where(url: nil).each_batch(of: 50) do |batch| + range = batch.pluck('MIN(id)', 'MAX(id)').first + + Gitlab::BackgroundMigration::ExtractServicesUrl.new.perform(*range) + end end def down @@ -230,6 +245,15 @@ class ConsumeRemainingExtractServicesUrlJobs < ActiveRecord::Migration end ``` +The final step runs for any un-migrated rows after all of the jobs have been +processed. This is in case a Sidekiq process running the background migrations +received SIGKILL, leading to the jobs being lost. (See +[more reliable Sidekiq queue][reliable-sidekiq] for more information.) + +If the application does not depend on the data being 100% migrated (for +instance, the data is advisory, and not mission-critical), then this final step +can be skipped. + This migration will then process any jobs for the ExtractServicesUrl migration and continue once all jobs have been processed. Once done you can safely remove the `services.properties` column. @@ -254,6 +278,9 @@ for more details. 1. Make sure that background migration jobs are idempotent. 1. Make sure that tests you write are not false positives. +1. Make sure that if the data being migrated is critical and cannot be lost, the + clean-up migration also checks the final state of the data before completing. [migrations-readme]: https://gitlab.com/gitlab-org/gitlab-ce/blob/master/spec/migrations/README.md [issue-rspec-hooks]: https://gitlab.com/gitlab-org/gitlab-ce/issues/35351 +[reliable-sidekiq]: https://gitlab.com/gitlab-org/gitlab-ce/issues/36791 |