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class MigrateStageIdReferenceInBackground < ActiveRecord::Migration[4.2]
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
BATCH_SIZE = 10000
RANGE_SIZE = 1000
MIGRATION = 'MigrateBuildStageIdReference'.freeze
disable_ddl_transaction!
class Build < ActiveRecord::Base
self.table_name = 'ci_builds'
include ::EachBatch
end
##
# It will take around 3 days to process 20M ci_builds.
#
def up
Build.where(stage_id: nil).each_batch(of: BATCH_SIZE) do |relation, index|
relation.each_batch(of: RANGE_SIZE) do |relation|
range = relation.pluck('MIN(id)', 'MAX(id)').first
BackgroundMigrationWorker
.perform_in(index * 2.minutes, MIGRATION, range)
end
end
end
def down
# noop
end
end
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