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class ScheduleMergeRequestDiffMigrations < ActiveRecord::Migration
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
BATCH_SIZE = 2500
MIGRATION = 'DeserializeMergeRequestDiffsAndCommits'
disable_ddl_transaction!
class MergeRequestDiff < ActiveRecord::Base
self.table_name = 'merge_request_diffs'
include ::EachBatch
end
# Assuming that there are 5 million rows affected (which is more than on
# GitLab.com), and that each batch of 2,500 rows takes up to 5 minutes, then
# we can migrate all the rows in 7 days.
#
# On staging, plucking the IDs themselves takes 5 seconds.
def up
non_empty = 'st_commits IS NOT NULL OR st_diffs IS NOT NULL'
MergeRequestDiff.where(non_empty).each_batch(of: BATCH_SIZE) do |relation, index|
range = relation.pluck('MIN(id)', 'MAX(id)').first
BackgroundMigrationWorker.perform_in(index * 5.minutes, MIGRATION, range)
end
end
def down
end
end
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