1 files changed, 56 insertions, 0 deletions
diff --git a/db/post_migrate/20190214112022_schedule_sync_issuables_state_id.rb b/db/post_migrate/20190214112022_schedule_sync_issuables_state_id.rb
new file mode 100644
index 00000000000..6edb0bf2d5e
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+++ b/db/post_migrate/20190214112022_schedule_sync_issuables_state_id.rb
@@ -0,0 +1,56 @@
+class ScheduleSyncIssuablesStateId < ActiveRecord::Migration[5.0]
+  # This migration schedules the sync of state_id for issues and merge requests
+  # which are converting the state column from string to integer.
+  # For more information check: https://gitlab.com/gitlab-org/gitlab-ce/issues/51789
+
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  # 2019-02-12 gitlab.com issuable numbers
+  # issues count: 13587305
+  # merge requests count: 18925274
+  #
+  # Using 5000 as batch size and 115 seconds interval will give:
+  # 2718 jobs for issues - taking ~86 hours
+  # 3786 jobs for merge requests - taking ~120 hours
+  #
+  BATCH_SIZE = 5000
+  DELAY_INTERVAL = 120.seconds.to_i
+  ISSUES_MIGRATION = 'SyncIssuesStateId'.freeze
+  MERGE_REQUESTS_MIGRATION = 'SyncMergeRequestsStateId'.freeze
+
+  disable_ddl_transaction!
+
+  class Issue < ActiveRecord::Base
+    include EachBatch
+
+    self.table_name = 'issues'
+  end
+
+  class MergeRequest < ActiveRecord::Base
+    include EachBatch
+
+    self.table_name = 'merge_requests'
+  end
+
+  def up
+    queue_background_migration_jobs_by_range_at_intervals(
+      Issue.all,
+      ISSUES_MIGRATION,
+      DELAY_INTERVAL,
+      batch_size: BATCH_SIZE
+    )
+
+    queue_background_migration_jobs_by_range_at_intervals(
+      MergeRequest.all,
+      MERGE_REQUESTS_MIGRATION,
+      DELAY_INTERVAL,
+      batch_size: BATCH_SIZE
+    )
+  end
+
+  def down
+    # No op
+  end
+end