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# frozen_string_literal: true
require 'spec_helper'
RSpec.describe Gitlab::Database::Partitioning::SlidingListStrategy do
let(:connection) { ActiveRecord::Base.connection }
let(:table_name) { :_test_partitioned_test }
let(:model) { double('model', table_name: table_name, ignored_columns: %w[partition], connection: connection) }
let(:next_partition_if) { double('next_partition_if') }
let(:detach_partition_if) { double('detach_partition_if') }
subject(:strategy) do
described_class.new(model, :partition,
next_partition_if: next_partition_if,
detach_partition_if: detach_partition_if)
end
before do
connection.execute(<<~SQL)
create table #{table_name}
(
id serial not null,
partition bigint not null default 2,
created_at timestamptz not null,
primary key (id, partition)
)
partition by list(partition);
create table #{table_name}_1
partition of #{table_name} for values in (1);
create table #{table_name}_2
partition of #{table_name} for values in (2);
SQL
end
describe '#current_partitions' do
it 'detects both partitions' do
expect(strategy.current_partitions).to eq([
Gitlab::Database::Partitioning::SingleNumericListPartition.new(
table_name, 1, partition_name: '_test_partitioned_test_1'
),
Gitlab::Database::Partitioning::SingleNumericListPartition.new(
table_name, 2, partition_name: '_test_partitioned_test_2'
)
])
end
end
describe '#validate_and_fix' do
it 'does not call change_column_default if the partitioning in a valid state' do
expect(strategy.model.connection).not_to receive(:change_column_default)
strategy.validate_and_fix
end
it 'calls change_column_default on partition_key with the most default partition number' do
connection.change_column_default(model.table_name, strategy.partitioning_key, 1)
expect(Gitlab::AppLogger).to receive(:warn).with(
message: 'Fixed default value of sliding_list_strategy partitioning_key',
connection_name: 'main',
old_value: 1,
new_value: 2,
table_name: table_name,
column: strategy.partitioning_key
)
expect(strategy.model.connection).to receive(:change_column_default).with(
model.table_name, strategy.partitioning_key, 2
).and_call_original
strategy.validate_and_fix
end
it 'does not change the default column if it has been changed in the meanwhile by another process' do
expect(strategy).to receive(:current_default_value).and_return(1, 2)
expect(strategy.model.connection).not_to receive(:change_column_default)
expect(Gitlab::AppLogger).to receive(:warn).with(
message: 'Table partitions or partition key default value have been changed by another process',
table_name: table_name,
default_value: 2
)
strategy.validate_and_fix
end
end
describe '#active_partition' do
it 'is the partition with the largest value' do
expect(strategy.active_partition.value).to eq(2)
end
end
describe '#missing_partitions' do
context 'when next_partition_if returns true' do
let(:next_partition_if) { proc { true } }
it 'is a partition definition for the next partition in the series' do
extra = strategy.missing_partitions
expect(extra.length).to eq(1)
expect(extra.first.value).to eq(3)
end
end
context 'when next_partition_if returns false' do
let(:next_partition_if) { proc { false } }
it 'is empty' do
expect(strategy.missing_partitions).to be_empty
end
end
context 'when there are no partitions for the table' do
it 'returns a partition for value 1' do
connection.execute("drop table #{table_name}_1; drop table #{table_name}_2;")
missing_partitions = strategy.missing_partitions
expect(missing_partitions.size).to eq(1)
missing_partition = missing_partitions.first
expect(missing_partition.value).to eq(1)
end
end
end
describe '#extra_partitions' do
before do
(3..10).each do |i|
connection.execute("CREATE TABLE #{table_name}_#{i} PARTITION OF #{table_name} FOR VALUES IN (#{i})")
end
end
context 'when some partitions are true for detach_partition_if' do
let(:detach_partition_if) { ->(p) { p != 5 } }
it 'is the leading set of partitions before that value' do
# should not contain partition 2 since it's the default value for the partition column
expect(strategy.extra_partitions.map(&:value)).to contain_exactly(1, 3, 4)
end
end
context 'when all partitions are true for detach_partition_if' do
let(:detach_partition_if) { proc { true } }
it 'is all but the most recent partition', :aggregate_failures do
expect(strategy.extra_partitions.map(&:value)).to contain_exactly(1, 3, 4, 5, 6, 7, 8, 9)
expect(strategy.current_partitions.map(&:value).max).to eq(10)
end
end
end
describe '#initial_partition' do
it 'starts with the value 1', :aggregate_failures do
initial_partition = strategy.initial_partition
expect(initial_partition.value).to eq(1)
expect(initial_partition.table).to eq(strategy.table_name)
expect(initial_partition.partition_name).to eq("#{strategy.table_name}_1")
end
end
describe '#next_partition' do
it 'is one after the active partition', :aggregate_failures do
expect(strategy).to receive(:active_partition).and_return(double(value: 5))
next_partition = strategy.next_partition
expect(next_partition.value).to eq(6)
expect(next_partition.table).to eq(strategy.table_name)
expect(next_partition.partition_name).to eq("#{strategy.table_name}_6")
end
end
describe '#ensure_partitioning_column_ignored!' do
it 'raises when the column is not ignored' do
expect do
Class.new(ApplicationRecord) do
include PartitionedTable
partitioned_by :partition, strategy: :sliding_list,
next_partition_if: proc { false },
detach_partition_if: proc { false }
end
end.to raise_error(/ignored_columns/)
end
it 'does not raise when the column is ignored' do
expect do
Class.new(ApplicationRecord) do
include PartitionedTable
self.ignored_columns = [:partition]
partitioned_by :partition, strategy: :sliding_list,
next_partition_if: proc { false },
detach_partition_if: proc { false }
end
end.not_to raise_error
end
end
context 'redirecting inserts as the active partition changes' do
let(:model) do
Class.new(ApplicationRecord) do
include PartitionedTable
self.table_name = '_test_partitioned_test'
self.primary_key = :id
self.ignored_columns = %w[partition]
# method().call cannot be detected by rspec, so we add a layer of indirection here
def self.next_partition_if_wrapper(...)
next_partition?(...)
end
def self.detach_partition_if_wrapper(...)
detach_partition?(...)
end
partitioned_by :partition, strategy: :sliding_list,
next_partition_if: method(:next_partition_if_wrapper),
detach_partition_if: method(:detach_partition_if_wrapper)
def self.next_partition?(current_partition)
end
def self.detach_partition?(partition)
end
end
end
it 'redirects to the new partition', :aggregate_failures do
partition_2_model = model.create! # Goes in partition 2
allow(model).to receive(:next_partition?) do
model.partitioning_strategy.active_partition.value < 3
end
allow(model).to receive(:detach_partition?).and_return(false)
Gitlab::Database::Partitioning::PartitionManager.new(model).sync_partitions
partition_3_model = model.create!
# Rails doesn't pick up on database default changes, so we need to reload
# We also want to grab the partition column to verify what it was set to.
# In normal operation we make rails ignore it so that we can use a changing default
# So we force select * to load it
all_columns = model.select(model.arel_table[Arel.star])
partition_2_model = all_columns.find(partition_2_model.id)
partition_3_model = all_columns.find(partition_3_model.id)
expect(partition_2_model.partition).to eq(2)
expect(partition_3_model.partition).to eq(3)
end
end
end
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