gitlab-org--gitlab-foss/db/post_migrate/20170627101016_schedule_event_migrations.rb
Jan Provaznik 0fc9f9d3e7 Add version 4.2 to all existing migrations
DB schema generated by a migration may look different in
rails 4 and 5 (because rails 5 may use different default values).
For this reason it's important to explicitly set for which rails
version a migration was written for.

See https://stackoverflow.com/questions/35929869/activerecordmigration-deprecation-warning-asks-for-rails-version-but-im-no/35930912#35930912
2018-11-22 13:18:28 +01:00

40 lines
1 KiB
Ruby

# See http://doc.gitlab.com/ce/development/migration_style_guide.html
# for more information on how to write migrations for GitLab.
class ScheduleEventMigrations < ActiveRecord::Migration[4.2]
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
BUFFER_SIZE = 1000
disable_ddl_transaction!
class Event < ActiveRecord::Base
include EachBatch
self.table_name = 'events'
end
def up
jobs = []
Event.each_batch(of: 1000) do |relation|
min, max = relation.pluck('MIN(id), MAX(id)').first
if jobs.length == BUFFER_SIZE
# We push multiple jobs at a time to reduce the time spent in
# Sidekiq/Redis operations. We're using this buffer based approach so we
# don't need to run additional queries for every range.
BackgroundMigrationWorker.bulk_perform_async(jobs)
jobs.clear
end
jobs << ['MigrateEventsToPushEventPayloads', [min, max]]
end
BackgroundMigrationWorker.bulk_perform_async(jobs) unless jobs.empty?
end
def down
end
end