75 lines
2.5 KiB
Ruby
75 lines
2.5 KiB
Ruby
|
# frozen_string_literal: true
|
||
|
|
|
||
|
|
module Gitlab
|
||
|
|
module Database
|
||
|
|
module BackgroundMigration
|
||
|
|
module HealthStatus
|
||
|
|
module Indicators
|
||
|
|
class WriteAheadLog
|
||
|
|
include Gitlab::Utils::StrongMemoize
|
||
|
|
|
||
|
|
LIMIT = 42
|
||
|
|
PENDING_WAL_COUNT_SQL = <<~SQL
|
||
|
|
WITH
|
||
|
|
current_wal_file AS (
|
||
|
|
SELECT pg_walfile_name(pg_current_wal_insert_lsn()) AS pg_walfile_name
|
||
|
|
),
|
||
|
|
current_wal AS (
|
||
|
|
SELECT
|
||
|
|
('x' || substring(pg_walfile_name, 9, 8))::bit(32)::int AS log,
|
||
|
|
('x' || substring(pg_walfile_name, 17, 8))::bit(32)::int AS seg,
|
||
|
|
pg_walfile_name
|
||
|
|
FROM current_wal_file
|
||
|
|
),
|
||
|
|
archive_wal AS (
|
||
|
|
SELECT
|
||
|
|
('x' || substring(last_archived_wal, 9, 8))::bit(32)::int AS log,
|
||
|
|
('x' || substring(last_archived_wal, 17, 8))::bit(32)::int AS seg,
|
||
|
|
last_archived_wal
|
||
|
|
FROM pg_stat_archiver
|
||
|
|
)
|
||
|
|
SELECT ((current_wal.log - archive_wal.log) * 256) + (current_wal.seg - archive_wal.seg) AS pending_wal_count
|
||
|
|
FROM current_wal, archive_wal
|
||
|
|
SQL
|
||
|
|
|
||
|
|
def initialize(context)
|
||
|
|
@connection = context.connection
|
||
|
|
end
|
||
|
|
|
||
|
|
def evaluate
|
||
|
|
return Signals::NotAvailable.new(self.class, reason: 'indicator disabled') unless enabled?
|
||
|
|
|
||
|
|
unless pending_wal_count
|
||
|
|
return Signals::NotAvailable.new(self.class, reason: 'WAL archive queue can not be calculated')
|
||
|
|
end
|
||
|
|
|
||
|
|
if pending_wal_count > LIMIT
|
||
|
|
Signals::Stop.new(self.class, reason: "WAL archive queue is too big")
|
||
|
|
else
|
||
|
|
Signals::Normal.new(self.class, reason: 'WAL archive queue is within limit')
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
private
|
||
|
|
|
||
|
|
attr_reader :connection
|
||
|
|
|
||
|
|
def enabled?
|
||
|
|
Feature.enabled?(:batched_migrations_health_status_wal, type: :ops)
|
||
|
|
end
|
||
|
|
|
||
|
|
# Returns number of WAL segments pending archival
|
||
|
|
def pending_wal_count
|
||
|
|
strong_memoize(:pending_wal_count) do
|
||
|
|
Gitlab::Database::LoadBalancing::Session.current.use_primary do
|
||
|
|
connection.execute(PENDING_WAL_COUNT_SQL).to_a.first&.fetch('pending_wal_count')
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|