2018-12-23 12:14:25 +05:30
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class ScheduleMergeRequestDiffMigrations < ActiveRecord::Migration[4.2]
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2017-09-10 17:25:29 +05:30
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include Gitlab::Database::MigrationHelpers
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DOWNTIME = false
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BATCH_SIZE = 2500
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MIGRATION = 'DeserializeMergeRequestDiffsAndCommits'
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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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# Assuming that there are 5 million rows affected (which is more than on
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# GitLab.com), and that each batch of 2,500 rows takes up to 5 minutes, then
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# we can migrate all the rows in 7 days.
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#
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# On staging, plucking the IDs themselves takes 5 seconds.
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def up
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non_empty = 'st_commits IS NOT NULL OR st_diffs IS NOT NULL'
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MergeRequestDiff.where(non_empty).each_batch(of: BATCH_SIZE) do |relation, index|
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range = relation.pluck('MIN(id)', 'MAX(id)').first
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BackgroundMigrationWorker.perform_in(index * 5.minutes, MIGRATION, range)
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end
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end
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def down
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end
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end
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