From 15ec6a13eb4d839d252315bf5b0a50d28351cb5f Mon Sep 17 00:00:00 2001
From: Sean McGivern <sean@gitlab.com>
Date: Tue, 3 Jul 2018 11:08:14 +0100
Subject: Temporarily remove MR diffs removal migration

We will re-add this with a more efficient bulk scheduling method.
---
 ...0619121030_enqueue_delete_diff_files_workers.rb | 70 ----------------------
 1 file changed, 70 deletions(-)
 delete mode 100644 db/post_migrate/20180619121030_enqueue_delete_diff_files_workers.rb

(limited to 'db')

diff --git a/db/post_migrate/20180619121030_enqueue_delete_diff_files_workers.rb b/db/post_migrate/20180619121030_enqueue_delete_diff_files_workers.rb
deleted file mode 100644
index 5fb3d545624..00000000000
--- a/db/post_migrate/20180619121030_enqueue_delete_diff_files_workers.rb
+++ /dev/null
@@ -1,70 +0,0 @@
-class EnqueueDeleteDiffFilesWorkers < ActiveRecord::Migration
-  include Gitlab::Database::MigrationHelpers
-
-  class MergeRequestDiff < ActiveRecord::Base
-    self.table_name = 'merge_request_diffs'
-
-    belongs_to :merge_request
-
-    include EachBatch
-  end
-
-  DOWNTIME = false
-  BATCH_SIZE = 1000
-  MIGRATION = 'DeleteDiffFiles'
-  DELAY_INTERVAL = 8.minutes
-  TMP_INDEX = 'tmp_partial_diff_id_with_files_index'.freeze
-
-  disable_ddl_transaction!
-
-  def up
-    # We add temporary index, to make iteration over batches more performant.
-    # Conditional here is to avoid the need of doing that in a separate
-    # migration file to make this operation idempotent.
-    #
-    unless index_exists_by_name?(:merge_request_diffs, TMP_INDEX)
-      add_concurrent_index(:merge_request_diffs, :id, where: "(state NOT IN ('without_files', 'empty'))", name: TMP_INDEX)
-    end
-
-
-    diffs_with_files = MergeRequestDiff.where.not(state: ['without_files', 'empty'])
-
-    # explain (analyze, buffers) example for the iteration:
-    #
-    # Index Only Scan using tmp_index_20013 on merge_request_diffs  (cost=0.43..1630.19 rows=60567 width=4) (actual time=0.047..9.572 rows=56976 loops=1)
-    #   Index Cond: ((id >= 764586) AND (id < 835298))
-    #   Heap Fetches: 8
-    #   Buffers: shared hit=18188
-    # Planning time: 0.752 ms
-    # Execution time: 12.430 ms
-    #
-    diffs_with_files.each_batch(of: BATCH_SIZE) do |relation, outer_index|
-      ids = relation.pluck(:id)
-
-      ids.each_with_index do |diff_id, inner_index|
-        # This will give some space between batches of workers.
-        interval = DELAY_INTERVAL * outer_index + inner_index.minutes
-
-        # A single `merge_request_diff` can be associated with way too many
-        # `merge_request_diff_files`. It's better to avoid batching these and
-        # schedule one at a time.
-        #
-        # Considering roughly 6M jobs, this should take ~30 days to process all
-        # of them.
-        #
-        BackgroundMigrationWorker.perform_in(interval, MIGRATION, [diff_id])
-      end
-    end
-
-    # We remove temporary index, because it is not required during standard
-    # operations and runtime.
-    #
-    remove_concurrent_index_by_name(:merge_request_diffs, TMP_INDEX)
-  end
-
-  def down
-    if index_exists_by_name?(:merge_request_diffs, TMP_INDEX)
-      remove_concurrent_index_by_name(:merge_request_diffs, TMP_INDEX)
-    end
-  end
-end
-- 
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