diff options
Diffstat (limited to 'db/post_migrate/20170926150348_schedule_merge_request_diff_migrations_take_two.rb')
-rw-r--r-- | db/post_migrate/20170926150348_schedule_merge_request_diff_migrations_take_two.rb | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/db/post_migrate/20170926150348_schedule_merge_request_diff_migrations_take_two.rb b/db/post_migrate/20170926150348_schedule_merge_request_diff_migrations_take_two.rb new file mode 100644 index 00000000000..5732cb85ea5 --- /dev/null +++ b/db/post_migrate/20170926150348_schedule_merge_request_diff_migrations_take_two.rb @@ -0,0 +1,32 @@ +class ScheduleMergeRequestDiffMigrationsTakeTwo < ActiveRecord::Migration + include Gitlab::Database::MigrationHelpers + + DOWNTIME = false + BATCH_SIZE = 500 + MIGRATION = 'DeserializeMergeRequestDiffsAndCommits' + DELAY_INTERVAL = 10.minutes + + disable_ddl_transaction! + + class MergeRequestDiff < ActiveRecord::Base + self.table_name = 'merge_request_diffs' + + include ::EachBatch + + default_scope { where('st_commits IS NOT NULL OR st_diffs IS NOT NULL') } + end + + # By this point, we assume ScheduleMergeRequestDiffMigrations - the first + # version of this - has already run. On GitLab.com, we have ~220k un-migrated + # rows, but these rows will, in general, take a long time. + # + # With a gap of 10 minutes per batch, and 500 rows per batch, these migrations + # are scheduled over 220_000 / 500 / 6 ~= 74 hours, which is a little over + # three days. + def up + queue_background_migration_jobs_by_range_at_intervals(MergeRequestDiff, MIGRATION, DELAY_INTERVAL, batch_size: BATCH_SIZE) + end + + def down + end +end |