42 lines
1.2 KiB
Ruby
42 lines
1.2 KiB
Ruby
# frozen_string_literal: true
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class MigrateNullExternalDiffStoreToLocalValue < ActiveRecord::Migration[6.0]
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include Gitlab::Database::MigrationHelpers
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DOWNTIME = false
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JOB_INTERVAL = 2.minutes + 5.seconds
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BATCH_SIZE = 5_000
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MIGRATION = 'SetNullExternalDiffStoreToLocalValue'
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disable_ddl_transaction!
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class MergeRequestDiff < ActiveRecord::Base
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self.table_name = 'merge_request_diffs'
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include ::EachBatch
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end
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def up
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# On GitLab.com, 19M of 93M rows have NULL external_diff_store.
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#
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# With batches of 5000 and a background migration job interval of 2m 5s,
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# 3.8K jobs are scheduled over 5.5 days.
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#
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# The index `index_merge_request_diffs_external_diff_store_is_null` is
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# expected to be used here and in the jobs.
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#
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# queue_background_migration_jobs_by_range_at_intervals is not used because
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# it would enqueue 18.6K jobs and we have an index for getting these ranges.
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MergeRequestDiff.where(external_diff_store: nil).each_batch(of: BATCH_SIZE) do |batch, index|
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range = batch.pluck(Arel.sql("MIN(id)"), Arel.sql("MAX(id)")).first
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delay = index * JOB_INTERVAL
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migrate_in(delay.seconds, MIGRATION, [*range])
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end
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end
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def down
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# noop
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end
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end
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