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# 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
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.perform_bulk(jobs)
jobs.clear
end
jobs << ['MigrateEventsToPushEventPayloads', [min, max]]
end
BackgroundMigrationWorker.perform_bulk(jobs) unless jobs.empty?
end
def down
end
end
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