73 lines
2.6 KiB
Ruby
73 lines
2.6 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module BackgroundMigration
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# Backfills the `issues.work_item_type_id` column, replacing any
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# instances of `NULL` with the appropriate `work_item_types.id` based on `issues.issue_type`
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class BackfillWorkItemTypeIdForIssues
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# Basic AR model for issues table
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class MigrationIssue < ApplicationRecord
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include ::EachBatch
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self.table_name = 'issues'
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scope :base_query, ->(base_type) { where(work_item_type_id: nil, issue_type: base_type) }
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end
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MAX_UPDATE_RETRIES = 3
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def perform(start_id, end_id, batch_table, batch_column, sub_batch_size, pause_ms, base_type, base_type_id)
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parent_batch_relation = relation_scoped_to_range(batch_table, batch_column, start_id, end_id, base_type)
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parent_batch_relation.each_batch(column: batch_column, of: sub_batch_size) do |sub_batch|
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first, last = sub_batch.pluck(Arel.sql('min(id), max(id)')).first
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# The query need to be reconstructed because .each_batch modifies the default scope
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# See: https://gitlab.com/gitlab-org/gitlab/-/issues/330510
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reconstructed_sub_batch = MigrationIssue.unscoped.base_query(base_type).where(id: first..last)
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batch_metrics.time_operation(:update_all) do
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update_with_retry(reconstructed_sub_batch, base_type_id)
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end
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pause_ms = 0 if pause_ms < 0
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sleep(pause_ms * 0.001)
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end
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end
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def batch_metrics
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@batch_metrics ||= Gitlab::Database::BackgroundMigration::BatchMetrics.new
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end
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private
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# Retry mechanism required as update statements on the issues table will randomly take longer than
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# expected due to gin indexes https://gitlab.com/gitlab-org/gitlab/-/merge_requests/71869#note_775796352
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def update_with_retry(sub_batch, base_type_id)
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update_attempt = 1
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begin
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update_batch(sub_batch, base_type_id)
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rescue ActiveRecord::StatementTimeout, ActiveRecord::QueryCanceled => e
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update_attempt += 1
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if update_attempt <= MAX_UPDATE_RETRIES
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# sleeping 30 seconds as it might take a long time to clean the gin index pending list
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sleep(30)
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retry
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end
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raise e
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end
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end
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def update_batch(sub_batch, base_type_id)
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sub_batch.update_all(work_item_type_id: base_type_id)
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end
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def relation_scoped_to_range(source_table, source_key_column, start_id, end_id, base_type)
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MigrationIssue.where(source_key_column => start_id..end_id).base_query(base_type)
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end
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end
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end
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end
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