90 lines
2.9 KiB
Ruby
90 lines
2.9 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module Database
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module MigrationHelpers
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module WraparoundVacuumHelpers
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class WraparoundCheck
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WraparoundError = Class.new(StandardError)
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def initialize(table_name, migration:)
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@migration = migration
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@table_name = table_name
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validate_table_existence!
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end
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def execute
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return if disabled?
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return unless wraparound_vacuum.present?
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log "Autovacuum with wraparound prevention mode is running on `#{table_name}`", title: true
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log "This process prevents the migration from acquiring the necessary locks"
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log "Query: `#{wraparound_vacuum[:query]}`"
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log "Current duration: #{wraparound_vacuum[:duration].inspect}"
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log "Process id: #{wraparound_vacuum[:pid]}"
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log "You can wait until it completes or if absolutely necessary interrupt it using: " \
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"`select pg_cancel_backend(#{wraparound_vacuum[:pid]});`"
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log "Be aware that a new process will kick in immediately, so multiple interruptions " \
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"might be required to time it right with the locks retry mechanism"
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end
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private
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attr_reader :table_name
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delegate :say, :connection, to: :@migration
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def wraparound_vacuum
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@wraparound_vacuum ||= transform_wraparound_vacuum
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end
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def transform_wraparound_vacuum
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result = raw_wraparound_vacuum
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values = Array.wrap(result.cast_values.first)
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result.columns.zip(values).to_h.with_indifferent_access.compact
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end
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def raw_wraparound_vacuum
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connection.select_all(<<~SQL.squish)
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SELECT pid, state, age(clock_timestamp(), query_start) as duration, query
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FROM pg_stat_activity
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WHERE query ILIKE '%VACUUM%' || #{quoted_table_name} || '%(to prevent wraparound)'
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AND backend_type = 'autovacuum worker'
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LIMIT 1
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SQL
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end
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def validate_table_existence!
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return if connection.table_exists?(table_name)
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raise WraparoundError, "Table #{table_name} does not exist"
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end
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def quoted_table_name
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connection.quote(table_name)
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end
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def disabled?
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return true unless wraparound_check_allowed?
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Gitlab::Utils.to_boolean(ENV['GITLAB_MIGRATIONS_DISABLE_WRAPAROUND_CHECK'])
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end
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def wraparound_check_allowed?
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Gitlab.com? || Gitlab.dev_or_test_env?
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end
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def log(text, title: false)
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say text, !title
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end
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end
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def check_if_wraparound_in_progress(table_name)
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WraparoundCheck.new(table_name, migration: self).execute
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end
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end
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end
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end
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end
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