87 lines
4.4 KiB
Ruby
87 lines
4.4 KiB
Ruby
# frozen_string_literal: true
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class FinalizeEventsBigintConversion < ActiveRecord::Migration[6.1]
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include Gitlab::Database::MigrationHelpers
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disable_ddl_transaction!
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TABLE_NAME = 'events'
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def up
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ensure_batched_background_migration_is_finished(
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job_class_name: 'CopyColumnUsingBackgroundMigrationJob',
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table_name: TABLE_NAME,
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column_name: 'id',
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job_arguments: [["id"], ["id_convert_to_bigint"]]
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)
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swap
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end
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def down
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swap
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end
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private
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def swap
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# This is to replace the existing "events_pkey" PRIMARY KEY, btree (id)
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add_concurrent_index TABLE_NAME, :id_convert_to_bigint, unique: true, name: 'index_events_on_id_convert_to_bigint'
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# This is to replace the existing "index_events_on_project_id_and_id" btree (project_id, id)
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add_concurrent_index TABLE_NAME, [:project_id, :id_convert_to_bigint], name: 'index_events_on_project_id_and_id_convert_to_bigint'
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# This is to replace the existing "index_events_on_project_id_and_id_desc_on_merged_action" btree (project_id, id DESC) WHERE action = 7
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add_concurrent_index TABLE_NAME, [:project_id, :id_convert_to_bigint], order: { id_convert_to_bigint: :desc },
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where: "action = 7", name: 'index_events_on_project_id_and_id_bigint_desc_on_merged_action'
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# Add a FK on `push_event_payloads(event_id)` to `id_convert_to_bigint`, the old FK (fk_36c74129da)
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# will be removed when events_pkey constraint is droppped.
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fk_event_id = concurrent_foreign_key_name(:push_event_payloads, :event_id)
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fk_event_id_tmp = "#{fk_event_id}_tmp"
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add_concurrent_foreign_key :push_event_payloads, TABLE_NAME,
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column: :event_id, target_column: :id_convert_to_bigint,
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name: fk_event_id_tmp, on_delete: :cascade, reverse_lock_order: true
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with_lock_retries(raise_on_exhaustion: true) do
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# We'll need ACCESS EXCLUSIVE lock on the related tables,
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# lets make sure it can be acquired from the start.
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# Lock order should be
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# 1. events
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# 2. push_event_payloads
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# in order to match the order in EventCreateService#create_push_event,
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# and avoid deadlocks.
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execute "LOCK TABLE #{TABLE_NAME}, push_event_payloads IN ACCESS EXCLUSIVE MODE"
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# Swap column names
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temp_name = 'id_tmp'
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execute "ALTER TABLE #{quote_table_name(TABLE_NAME)} RENAME COLUMN #{quote_column_name(:id)} TO #{quote_column_name(temp_name)}"
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execute "ALTER TABLE #{quote_table_name(TABLE_NAME)} RENAME COLUMN #{quote_column_name(:id_convert_to_bigint)} TO #{quote_column_name(:id)}"
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execute "ALTER TABLE #{quote_table_name(TABLE_NAME)} RENAME COLUMN #{quote_column_name(temp_name)} TO #{quote_column_name(:id_convert_to_bigint)}"
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# We need to update the trigger function in order to make PostgreSQL to
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# regenerate the execution plan for it. This is to avoid type mismatch errors like
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# "type of parameter 15 (bigint) does not match that when preparing the plan (integer)"
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function_name = Gitlab::Database::UnidirectionalCopyTrigger.on_table(TABLE_NAME, connection: connection).name(:id, :id_convert_to_bigint)
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execute "ALTER FUNCTION #{quote_table_name(function_name)} RESET ALL"
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# Swap defaults
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execute "ALTER SEQUENCE events_id_seq OWNED BY #{TABLE_NAME}.id"
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change_column_default TABLE_NAME, :id, -> { "nextval('events_id_seq'::regclass)" }
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change_column_default TABLE_NAME, :id_convert_to_bigint, 0
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# Swap PK constraint
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execute "ALTER TABLE #{TABLE_NAME} DROP CONSTRAINT events_pkey CASCADE" # this will drop fk_36c74129da
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rename_index TABLE_NAME, 'index_events_on_id_convert_to_bigint', 'events_pkey'
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execute "ALTER TABLE #{TABLE_NAME} ADD CONSTRAINT events_pkey PRIMARY KEY USING INDEX events_pkey"
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# Rename the rest of the indexes (we already hold an exclusive lock, so no need to use DROP INDEX CONCURRENTLY here
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execute 'DROP INDEX index_events_on_project_id_and_id'
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rename_index TABLE_NAME, 'index_events_on_project_id_and_id_convert_to_bigint', 'index_events_on_project_id_and_id'
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execute 'DROP INDEX index_events_on_project_id_and_id_desc_on_merged_action'
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rename_index TABLE_NAME, 'index_events_on_project_id_and_id_bigint_desc_on_merged_action', 'index_events_on_project_id_and_id_desc_on_merged_action'
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# Change the name of the temporary FK
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rename_constraint(:push_event_payloads, fk_event_id_tmp, fk_event_id)
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end
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end
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end
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