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# frozen_string_literal: true
class MigrateNullExternalDiffStoreToLocalValue < ActiveRecord::Migration[6.0]
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
JOB_INTERVAL = 2.minutes + 5.seconds
BATCH_SIZE = 5_000
MIGRATION = 'SetNullExternalDiffStoreToLocalValue'
disable_ddl_transaction!
class MergeRequestDiff < ActiveRecord::Base
self.table_name = 'merge_request_diffs'
include ::EachBatch
end
def up
# On GitLab.com, 19M of 93M rows have NULL external_diff_store.
#
# With batches of 5000 and a background migration job interval of 2m 5s,
# 3.8K jobs are scheduled over 5.5 days.
#
# The index `index_merge_request_diffs_external_diff_store_is_null` is
# expected to be used here and in the jobs.
#
# queue_background_migration_jobs_by_range_at_intervals is not used because
# it would enqueue 18.6K jobs and we have an index for getting these ranges.
MergeRequestDiff.where(external_diff_store: nil).each_batch(of: BATCH_SIZE) do |batch, index|
range = batch.pluck(Arel.sql("MIN(id)"), Arel.sql("MAX(id)")).first
delay = index * JOB_INTERVAL
migrate_in(delay.seconds, MIGRATION, [*range])
end
end
def down
# noop
end
end
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