34 lines
960 B
Ruby
34 lines
960 B
Ruby
class ScheduleMergeRequestDiffMigrations < ActiveRecord::Migration[4.2]
|
|
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
|