132 lines
4.4 KiB
Ruby
132 lines
4.4 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module Database
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module Partitioning
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class PartitionManager
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UnsafeToDetachPartitionError = Class.new(StandardError)
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def self.register(model)
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raise ArgumentError, "Only models with a #partitioning_strategy can be registered." unless model.respond_to?(:partitioning_strategy)
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models << model
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end
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def self.models
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@models ||= Set.new
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end
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LEASE_TIMEOUT = 1.minute
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MANAGEMENT_LEASE_KEY = 'database_partition_management_%s'
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RETAIN_DETACHED_PARTITIONS_FOR = 1.week
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attr_reader :models
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def initialize(models = self.class.models)
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@models = models
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end
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def sync_partitions
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Gitlab::AppLogger.info("Checking state of dynamic postgres partitions")
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models.each do |model|
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# Double-checking before getting the lease:
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# The prevailing situation is no missing partitions and no extra partitions
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next if missing_partitions(model).empty? && extra_partitions(model).empty?
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only_with_exclusive_lease(model, lease_key: MANAGEMENT_LEASE_KEY) do
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partitions_to_create = missing_partitions(model)
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create(partitions_to_create) unless partitions_to_create.empty?
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if Feature.enabled?(:partition_pruning, default_enabled: :yaml)
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partitions_to_detach = extra_partitions(model)
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detach(partitions_to_detach) unless partitions_to_detach.empty?
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end
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end
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rescue StandardError => e
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Gitlab::AppLogger.error(message: "Failed to create / detach partition(s)",
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table_name: model.table_name,
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exception_class: e.class,
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exception_message: e.message)
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end
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end
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private
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def missing_partitions(model)
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return [] unless connection.table_exists?(model.table_name)
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model.partitioning_strategy.missing_partitions
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end
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def extra_partitions(model)
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return [] unless connection.table_exists?(model.table_name)
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model.partitioning_strategy.extra_partitions
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end
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def only_with_exclusive_lease(model, lease_key:)
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lease = Gitlab::ExclusiveLease.new(lease_key % model.table_name, timeout: LEASE_TIMEOUT)
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yield if lease.try_obtain
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ensure
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lease&.cancel
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end
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def create(partitions)
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connection.transaction do
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with_lock_retries do
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partitions.each do |partition|
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connection.execute partition.to_sql
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Gitlab::AppLogger.info(message: "Created partition",
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partition_name: partition.partition_name,
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table_name: partition.table)
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end
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end
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end
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end
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def detach(partitions)
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connection.transaction do
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with_lock_retries do
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partitions.each { |p| detach_one_partition(p) }
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end
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end
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end
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def detach_one_partition(partition)
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assert_partition_detachable!(partition)
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connection.execute partition.to_detach_sql
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Postgresql::DetachedPartition.create!(table_name: partition.partition_name,
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drop_after: RETAIN_DETACHED_PARTITIONS_FOR.from_now)
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Gitlab::AppLogger.info(message: "Detached Partition",
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partition_name: partition.partition_name,
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table_name: partition.table)
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end
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def assert_partition_detachable!(partition)
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parent_table_identifier = "#{connection.current_schema}.#{partition.table}"
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if (example_fk = PostgresForeignKey.by_referenced_table_identifier(parent_table_identifier).first)
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raise UnsafeToDetachPartitionError, "Cannot detach #{partition.partition_name}, it would block while checking foreign key #{example_fk.name} on #{example_fk.constrained_table_identifier}"
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end
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end
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def with_lock_retries(&block)
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Gitlab::Database::WithLockRetries.new(
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klass: self.class,
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logger: Gitlab::AppLogger
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).run(&block)
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end
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def connection
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ActiveRecord::Base.connection
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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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