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# frozen_string_literal: true
module Gitlab
module Database
module Partitioning
class DetachedPartitionDropper
def perform
return unless Feature.enabled?(:drop_detached_partitions, default_enabled: :yaml)
Gitlab::AppLogger.info(message: "Checking for previously detached partitions to drop")
Postgresql::DetachedPartition.ready_to_drop.find_each do |detached_partition|
connection.transaction do
# Another process may have already dropped the table and deleted this entry
next unless (detached_partition = Postgresql::DetachedPartition.lock.find_by(id: detached_partition.id))
drop_detached_partition(detached_partition.table_name)
detached_partition.destroy!
end
rescue StandardError => e
Gitlab::AppLogger.error(message: "Failed to drop previously detached partition",
partition_name: detached_partition.table_name,
exception_class: e.class,
exception_message: e.message)
end
end
private
def drop_detached_partition(partition_name)
partition_identifier = qualify_partition_name(partition_name)
if partition_detached?(partition_identifier)
connection.drop_table(partition_identifier, if_exists: true)
Gitlab::AppLogger.info(message: "Dropped previously detached partition", partition_name: partition_name)
else
Gitlab::AppLogger.error(message: "Attempt to drop attached database partition", partition_name: partition_name)
end
end
def qualify_partition_name(table_name)
"#{Gitlab::Database::DYNAMIC_PARTITIONS_SCHEMA}.#{table_name}"
end
def partition_detached?(partition_identifier)
# PostgresPartition checks the pg_inherits view, so our partition will only show here if it's still attached
# and thus should not be dropped
!Gitlab::Database::PostgresPartition.for_identifier(partition_identifier).exists?
end
def connection
Postgresql::DetachedPartition.connection
end
end
end
end
end
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