101 lines
3.2 KiB
Ruby
101 lines
3.2 KiB
Ruby
# frozen_string_literal: true
|
|
|
|
module Gitlab
|
|
module Database
|
|
module LoadBalancing
|
|
class SidekiqServerMiddleware
|
|
include WalTrackingReceiver
|
|
|
|
JobReplicaNotUpToDate = Class.new(::Gitlab::SidekiqMiddleware::RetryError)
|
|
|
|
REPLICA_WAIT_SLEEP_SECONDS = 0.5
|
|
|
|
def call(worker, job, _queue)
|
|
# ActiveJobs have wrapped class stored in 'wrapped' key
|
|
resolved_class = job['wrapped']&.safe_constantize || worker.class
|
|
strategy = select_load_balancing_strategy(resolved_class, job)
|
|
|
|
job['load_balancing_strategy'] = strategy.to_s
|
|
|
|
if use_primary?(strategy)
|
|
::Gitlab::Database::LoadBalancing::Session.current.use_primary!
|
|
elsif strategy == :retry
|
|
raise JobReplicaNotUpToDate, "Sidekiq job #{resolved_class} JID-#{job['jid']} couldn't use the replica."\
|
|
" Replica was not up to date."
|
|
else
|
|
# this means we selected an up-to-date replica, but there is nothing to do in this case.
|
|
end
|
|
|
|
yield
|
|
ensure
|
|
clear
|
|
end
|
|
|
|
private
|
|
|
|
def clear
|
|
::Gitlab::Database::LoadBalancing.release_hosts
|
|
::Gitlab::Database::LoadBalancing::Session.clear_session
|
|
end
|
|
|
|
def use_primary?(strategy)
|
|
strategy.start_with?('primary')
|
|
end
|
|
|
|
def select_load_balancing_strategy(worker_class, job)
|
|
return :primary unless load_balancing_available?(worker_class)
|
|
|
|
wal_locations = get_wal_locations(job)
|
|
|
|
return :primary_no_wal if wal_locations.blank?
|
|
|
|
# Happy case: we can read from a replica.
|
|
return replica_strategy(worker_class, job) if databases_in_sync?(wal_locations)
|
|
|
|
3.times do
|
|
sleep REPLICA_WAIT_SLEEP_SECONDS
|
|
break if databases_in_sync?(wal_locations)
|
|
end
|
|
|
|
if databases_in_sync?(wal_locations)
|
|
replica_strategy(worker_class, job)
|
|
elsif can_retry?(worker_class, job)
|
|
# Optimistic case: The worker allows retries and we have retries left.
|
|
:retry
|
|
else
|
|
# Sad case: we need to fall back to the primary.
|
|
:primary
|
|
end
|
|
end
|
|
|
|
def get_wal_locations(job)
|
|
job['dedup_wal_locations'] || job['wal_locations']
|
|
end
|
|
|
|
def load_balancing_available?(worker_class)
|
|
worker_class.include?(::WorkerAttributes) &&
|
|
worker_class.utilizes_load_balancing_capabilities? &&
|
|
worker_class.get_data_consistency_feature_flag_enabled?
|
|
end
|
|
|
|
def can_retry?(worker_class, job)
|
|
worker_class.get_data_consistency == :delayed && not_yet_requeued?(job)
|
|
end
|
|
|
|
def replica_strategy(worker_class, job)
|
|
retried_before?(worker_class, job) ? :replica_retried : :replica
|
|
end
|
|
|
|
def retried_before?(worker_class, job)
|
|
worker_class.get_data_consistency == :delayed && !not_yet_requeued?(job)
|
|
end
|
|
|
|
def not_yet_requeued?(job)
|
|
# if `retry_count` is `nil` it indicates that this job was never retried
|
|
# the `0` indicates that this is a first retry
|
|
job['retry_count'].nil?
|
|
end
|
|
end
|
|
end
|
|
end
|
|
end
|