57 lines
1.9 KiB
Ruby
57 lines
1.9 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module BackgroundMigration
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# Base class for batched background migrations. Subclasses should implement the `#perform`
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# method as the entry point for the job's execution, which will be called with the migration
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# arguments (if any).
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class BatchedMigrationJob
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include Gitlab::Database::DynamicModelHelpers
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def initialize(start_id:, end_id:, batch_table:, batch_column:, sub_batch_size:, pause_ms:, connection:)
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@start_id = start_id
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@end_id = end_id
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@batch_table = batch_table
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@batch_column = batch_column
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@sub_batch_size = sub_batch_size
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@pause_ms = pause_ms
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@connection = connection
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end
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def perform(*job_arguments)
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raise NotImplementedError, "subclasses of #{self.class.name} must implement #{__method__}"
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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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attr_reader :start_id, :end_id, :batch_table, :batch_column, :sub_batch_size, :pause_ms, :connection
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def each_sub_batch(operation_name: :default, batching_arguments: {}, batching_scope: nil)
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all_batching_arguments = { column: batch_column, of: sub_batch_size }.merge(batching_arguments)
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parent_relation = parent_batch_relation(batching_scope)
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parent_relation.each_batch(**all_batching_arguments) do |relation|
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batch_metrics.instrument_operation(operation_name) do
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yield relation
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end
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sleep([pause_ms, 0].max * 0.001)
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end
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end
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def parent_batch_relation(batching_scope)
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parent_relation = define_batchable_model(batch_table, connection: connection)
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.where(batch_column => start_id..end_id)
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return parent_relation unless batching_scope
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batching_scope.call(parent_relation)
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end
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end
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end
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end
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