Class: Shard

Inherits:
ApplicationRecord show all
Defined in:
app/models/shard.rb

Constant Summary

Constants inherited from ApplicationRecord

ApplicationRecord::MAX_PLUCK

Class Method Summary collapse

Methods inherited from ApplicationRecord

cached_column_list, #create_or_load_association, declarative_enum, default_select_columns, id_in, id_not_in, iid_in, pluck_primary_key, primary_key_in, #readable_by?, safe_ensure_unique, safe_find_or_create_by, safe_find_or_create_by!, #to_ability_name, underscore, where_exists, where_not_exists, with_fast_read_statement_timeout, without_order

Methods included from SensitiveSerializableHash

#serializable_hash

Class Method Details

.by_name(name) ⇒ Object


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# File 'app/models/shard.rb', line 20

def self.by_name(name)
  safe_find_or_create_by(name: name)
end

.populate!Object

Store shard names from the configuration file in the database. This is not a list of active shards - we just want to assign an immutable, unique ID to every shard name for easy indexing / referencing.


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# File 'app/models/shard.rb', line 7

def self.populate!
  return unless table_exists?

  # The GitLab config does not change for the lifecycle of the process
  in_config = Gitlab.config.repositories.storages.keys.map(&:to_s)
  in_db = all.pluck(:name)

  # This may race with other processes creating shards at the same time, but
  # `by_name` will handle that correctly
  missing = in_config - in_db
  missing.map { |name| by_name(name) }
end