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class MigrateRemainingMrMetricsPopulatingBackgroundMigration < ActiveRecord::Migration[4.2]
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
BATCH_SIZE = 5_000
MIGRATION = 'PopulateMergeRequestMetricsWithEventsData'
DELAY_INTERVAL = 10.minutes
disable_ddl_transaction!
class MergeRequest < ActiveRecord::Base
self.table_name = 'merge_requests'
include ::EachBatch
end
def up
# Perform any ongoing background migration that might still be running. This
# avoids scheduling way too many of the same jobs on self-hosted instances
# if they're updating GitLab across multiple versions. The "Take one"
# migration was executed on 10.4 on
# SchedulePopulateMergeRequestMetricsWithEventsData.
Gitlab::BackgroundMigration.steal(MIGRATION)
metrics_not_exists_clause = <<~SQL
NOT EXISTS (SELECT 1 FROM merge_request_metrics
WHERE merge_request_metrics.merge_request_id = merge_requests.id)
SQL
relation = MergeRequest.where(metrics_not_exists_clause)
# We currently have ~400_000 MR records without metrics on GitLab.com.
# This means it'll schedule ~80 jobs (5000 MRs each) with a 10 minutes gap,
# so this should take ~14 hours for all background migrations to complete.
#
queue_background_migration_jobs_by_range_at_intervals(relation,
MIGRATION,
DELAY_INTERVAL,
batch_size: BATCH_SIZE)
end
def down
end
end
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