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mongo-ruby-driver
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Store sockets in thread-local variables when possible. 

Allow connection pools to grow if needed. All this minimizes
the number of locks required and reduces the waiting time
for these locks.
This commit is contained in:
Kyle Banker 2011-11-03 18:37:23 -04:00
parent 0b33a48dd9
commit f668678fd1
7 changed files with 222 additions and 52 deletions
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66
lib/mongo/connection.rb
View File

@ -19,10 +19,9 @@
require 'set'
require 'socket'
require 'thread'
module Mongo
# Instantiates and manages connections to MongoDB.
# Instantiates and manages self.connections to MongoDB.
class Connection
include Mongo::Logging
include Mongo::Networking
@ -35,11 +34,12 @@ module Mongo
DEFAULT_PORT = 27017
mongo_thread_local_accessor :connections
attr_reader :logger, :size, :auths, :primary, :safe, :host_to_try,
:pool_size, :connect_timeout, :pool_timeout,
:primary_pool, :socket_class
# Create a connection to single MongoDB instance.
#
# You may specify whether connection to slave is permitted.
@ -63,9 +63,9 @@ module Mongo
# to a single, slave node.
# @option opts [Logger, #debug] :logger (nil) A Logger instance for debugging driver ops. Note that
# logging negatively impacts performance; therefore, it should not be used for high-performance apps.
# @option opts [Integer] :pool_size (1) The maximum number of socket connections allowed per
# @option opts [Integer] :pool_size (1) The maximum number of socket self.connections allowed per
# connection pool. Note: this setting is relevant only for multi-threaded applications.
# @option opts [Float] :pool_timeout (5.0) When all of the connections a pool are checked out,
# @option opts [Float] :pool_timeout (5.0) When all of the self.connections a pool are checked out,
# this is the number of seconds to wait for a new connection to be released before throwing an exception.
# Note: this setting is relevant only for multi-threaded applications (which in Ruby are rare).
# @option opts [Float] :op_timeout (nil) The number of seconds to wait for a read operation to time out.
@ -80,7 +80,7 @@ module Mongo
# @example localhost, 27017
# Connection.new("localhost")
#
# @example localhost, 3000, max 5 connections, with max 5 seconds of wait time.
# @example localhost, 3000, max 5 self.connections, with max 5 seconds of wait time.
# Connection.new("localhost", 3000, :pool_size => 5, :timeout => 5)
#
# @example localhost, 3000, where this node may be a slave
@ -91,7 +91,7 @@ module Mongo
# @raise [ReplicaSetConnectionError] This is raised if a replica set name is specified and the
# driver fails to connect to a replica set with that name.
#
# @core connections
# @core self.connections
def initialize(host=nil, port=nil, opts={})
@host_to_try = format_pair(host, port)
@ -481,6 +481,55 @@ module Mongo
@max_bson_size
end
def get_local_reader
self.connections ||= {}
self.connections[self.object_id] ||= {}
self.connections[self.object_id][:reader] ||= checkout_reader
# Thread.current[:connections] ||= {}
# Thread.current[:connections][self.object_id] ||= {}
# Thread.current[:connections][self.object_id][:reader] ||= checkout_reader
end
def get_local_writer
self.connections ||= {}
self.connections[self.object_id] ||= {}
self.connections[self.object_id][:writer] ||= checkout_writer
# Thread.current[:connections] ||= {}
# Thread.current[:connections][self.object_id] ||= {}
# Thread.current[:connections][self.object_id][:writer] ||= checkout_writer
end
# Used to close, check in, or refresh sockets held
# in thread-local variables.
def local_socket_done(socket)
#checkin(socket)
puts "Done. Threads: #{Thread.list.size}, pool_size: #{self.pool_size}"
if self.connections[self.object_id][:reader] == socket
if self.read_pool.sockets_low?
puts "***SOCKETS ARE LOW! READER****"
checkin(socket)
self.connections[self.object_id][:reader] = nil
end
end
if self.connections[self.object_id][:writer] == socket
if self.primary_pool && self.primary_pool.sockets_low?
puts "***SOCKETS ARE LOW! WRITER****"
checkin(socket)
self.connections[self.object_id][:writer] = nil
end
end
# if Thread.current[:connections][self.object_id][:reader] == socket
# Thread.current[:connections][self.object_id][:reader] = nil
# end
# if Thread.current[:connections][self.object_id][:writer] == socket
# Thread.current[:connections][self.object_id][:writer] = nil
# end
end
# Checkout a socket for reading (i.e., a secondary node).
# Note: this is overridden in ReplSetConnection.
def checkout_reader
@ -525,9 +574,6 @@ module Mongo
# Default maximum BSON object size
@max_bson_size = Mongo::DEFAULT_MAX_BSON_SIZE
@safe_mutex_lock = Mutex.new
@safe_mutexes = Hash.new {|hash, key| hash[key] = Mutex.new}
# Determine whether to use SSL.
@ssl = opts.fetch(:ssl, false)
if @ssl

26
lib/mongo/cursor.rb
View File

@ -470,9 +470,11 @@ module Mongo
results, @n_received, @cursor_id = @connection.receive_message(
Mongo::Constants::OP_QUERY, message, nil, sock, @command,
nil, @options & OP_QUERY_EXHAUST != 0)
ensure
checkin_socket(sock) unless @socket
rescue ConnectionFailure, OperationFailure, OperationTimeout => ex
force_checkin_socket(sock)
raise ex
end
checkin_socket(sock) unless @socket
@returned += @n_received
@cache += results
@query_run = true
@ -505,9 +507,11 @@ module Mongo
begin
results, @n_received, @cursor_id = @connection.receive_message(
Mongo::Constants::OP_GET_MORE, message, nil, sock, @command, nil)
ensure
checkin_socket(sock) unless @socket
rescue ConnectionFailure, OperationFailure, OperationTimeout => ex
force_checkin_socket(sock)
raise ex
end
checkin_socket(sock) unless @socket
@returned += @n_received
@cache += results
close_cursor_if_query_complete
@ -516,10 +520,10 @@ module Mongo
def checkout_socket_from_connection
@checkin_connection = true
if @command || @read_preference == :primary
@connection.checkout_writer
@connection.get_local_writer
else
@read_pool = @connection.read_pool
@connection.checkout_reader
@connection.get_local_reader
end
end
@ -552,6 +556,16 @@ module Mongo
@read_pool.checkin(sock)
@checkin_read_pool = false
elsif @checkin_connection
@connection.local_socket_done(sock)
@checkin_connection = false
end
end
def force_checkin_socket(sock)
if @checkin_read_pool
@read_pool.checkin(sock)
@checkin_read_pool = false
else
@connection.checkin(sock)
@checkin_connection = false
end

34
lib/mongo/networking.rb
View File

@ -30,14 +30,16 @@ module Mongo
packed_message = message.to_s
if connection == :writer
socket = checkout_writer
sock = get_local_writer
else
socket = checkout_reader
sock = get_local_reader
end
send_message_on_socket(packed_message, socket)
ensure
checkin(socket)
send_message_on_socket(packed_message, sock)
local_socket_done(sock)
rescue ConnectionFailure, OperationFailure, OperationTimeout => ex
checkin(sock)
raise ex
end
end
@ -63,11 +65,13 @@ module Mongo
packed_message = message.append!(last_error_message).to_s
begin
sock = checkout_writer
sock = get_local_writer
send_message_on_socket(packed_message, sock)
docs, num_received, cursor_id = receive(sock, last_error_id)
ensure
local_socket_done(sock)
rescue ConnectionFailure, OperationFailure, OperationTimeout => ex
checkin(sock)
raise ex
end
if num_received == 1 && (error = docs[0]['err'] || docs[0]['errmsg'])
@ -103,11 +107,11 @@ module Mongo
should_checkin = false
else
if command
sock = checkout_writer
sock = get_local_writer
elsif read == :primary
sock = checkout_writer
sock = get_local_writer
elsif read == :secondary
sock = checkout_reader
sock = get_local_reader
else
sock = checkout_tagged(read)
end
@ -115,14 +119,12 @@ module Mongo
end
result = ''
@safe_mutexes[sock].synchronize do
send_message_on_socket(packed_message, sock)
result = receive(sock, request_id, exhaust)
end
ensure
if should_checkin
checkin(sock)
end
local_socket_done(sock) if should_checkin
rescue ConnectionFailure, OperationFailure, OperationTimeout => ex
checkin(sock) if should_checkin
raise ex
end
result
end

35
lib/mongo/repl_set_connection.rb
View File

@ -20,7 +20,8 @@ module Mongo
# Instantiates and manages connections to a MongoDB replica set.
class ReplSetConnection < Connection
attr_reader :replica_set_name, :seeds, :refresh_interval, :refresh_mode
attr_reader :replica_set_name, :seeds, :refresh_interval, :refresh_mode,
:refresh_version
# Create a connection to a MongoDB replica set.
#
@ -123,6 +124,7 @@ module Mongo
# Store the refresher thread
@refresh_thread = nil
@refresh_version = 0
# Maps
@sockets_to_pools = {}
@ -301,6 +303,36 @@ module Mongo
end
end
def get_local_reader
Thread.current[:connections] ||= {}
Thread.current[:connections][self.object_id] ||= {}
Thread.current[:connections][self.object_id][:version] ||= self.refresh_version
Thread.current[:connections][self.object_id][:reader] ||= checkout_reader
end
def get_local_writer
Thread.current[:connections] ||= {}
Thread.current[:connections][self.object_id] ||= {}
Thread.current[:connections][self.object_id][:version] ||= self.refresh_version
Thread.current[:connections][self.object_id][:writer] ||= checkout_writer
end
# Used to close, check in, or refresh sockets held
# in thread-local variables.
def local_socket_done
if Thread.current[:connections][self.object_id][:version] != self.refresh_version
checkin(Thread.current[:connections][self.object_id][:reader])
Thread.current[:connections][self.object_id][:reader] ||= checkout_reader
end
end
def checkin_sockets
checkin(Thread.current[:connections][self.object_id][:reader])
checkin(Thread.current[:connections][self.object_id][:writer])
Thread.current[:connections][self.object_id][:writer] = nil
Thread.current[:connections][self.object_id][:reader] = nil
end
# Checkout a socket for reading (i.e., a secondary node).
# Note that @read_pool might point to the primary pool
# if no read pool has been defined.
@ -480,6 +512,7 @@ module Mongo
@manager = new_manager
@seeds = @manager.seeds.dup
@sockets_to_pools.clear
@refresh_version += 1
old_manager.close if old_manager
end

25
lib/mongo/util/core_ext.rb
View File

@ -58,3 +58,28 @@ class String
end
end
#:nodoc:
class Class
def mongo_thread_local_accessor name, options = {}
m = Module.new
m.module_eval do
class_variable_set :"@@#{name}", Hash.new {|h,k| h[k] = options[:default] }
end
m.module_eval %{
def #{name}
@@#{name}[Thread.current.object_id]
end
def #{name}=(val)
@@#{name}[Thread.current.object_id] = val
end
}
class_eval do
include m
extend m
end
end
end

51
lib/mongo/util/pool.rb
View File

@ -21,7 +21,8 @@ module Mongo
MAX_PING_TIME = 1_000_000
attr_accessor :host, :port, :address,
:size, :timeout, :safe, :checked_out, :connection
:size, :timeout, :safe, :checked_out, :connection,
:sockets_low
# Create a new pool of connections.
def initialize(connection, host, port, opts={})
@ -36,7 +37,7 @@ module Mongo
@address = "#{@host}:#{@port}"
# Pool size and timeout.
@size = opts[:size] || 10
@size = opts[:size] || 10000
@timeout = opts[:timeout] || 5.0
# Mutex for synchronizing pool access
@ -48,9 +49,11 @@ module Mongo
# Operations to perform on a socket
@socket_ops = Hash.new { |h, k| h[k] = [] }
@sockets_low = true
@sockets = []
@pids = {}
@checked_out = []
@threads = {}
@ping_time = nil
@last_ping = nil
@closed = false
@ -76,6 +79,10 @@ module Mongo
@closed
end
def sockets_low?
@sockets_low
end
def inspect
"#<Mongo::Pool:0x#{self.object_id.to_s(16)} @host=#{@host} @port=#{port} " +
"@ping_time=#{@ping_time} #{@checked_out.size}/#{@size} sockets available.>"
@ -138,7 +145,9 @@ module Mongo
# Return a socket to the pool.
def checkin(socket)
@connection_mutex.synchronize do
puts "deleting #{socket}, size: #{@checked_out.size}"
@checked_out.delete(socket)
puts "size now: #{@checked_out.size}"
@queue.signal
end
true
@ -166,6 +175,7 @@ module Mongo
@sockets << socket
@pids[socket] = Process.pid
@checked_out << socket
@threads[socket] = Thread.current.object_id
socket
end
@ -211,10 +221,36 @@ module Mongo
checkout_new_socket
else
@checked_out << socket
@threads[socket] = Thread.current.object_id
socket
end
end
def cleanup
return unless @sockets.size > @size
puts "-----CLEANUP*****"
alive = {}
Thread.list.each do |t|
if t.alive?
alive[t.object_id] = true
end
end
@checked_out.each do |socket|
if !alive[@threads[socket]]
@checked_out.delete(socket)
if @sockets.size > @size
puts "CLEANING: #{socket}"
socket.close
@sockets.delete(socket)
end
end
end
end
# Check out an existing socket or create a new socket if the maximum
# pool size has not been exceeded. Otherwise, wait for the next
# available socket.
@ -228,15 +264,22 @@ module Mongo
"consider increasing the pool size or timeout."
end
puts "CHECKING OUT"
#@sockets_low = @checked_out.size > @size / 2
@connection_mutex.synchronize do
if @sockets.size > 0.7 * @size
@sockets_low = true
else
@sockets_low = false
end
socket = if @checked_out.size < @sockets.size
p "checkout existing from size #{@sockets.size}"
checkout_existing_socket
elsif @sockets.size < @size
else
checkout_new_socket
end
if socket
# This calls all procs, in order, scoped to existing sockets.
# At the moment, we use this to lazily authenticate and
# logout existing socket connections.

9
test/threading_test.rb
View File

@ -4,7 +4,7 @@ class TestThreading < Test::Unit::TestCase
include Mongo
@@db = standard_connection(:pool_size => 1, :timeout => 30).db(MONGO_TEST_DB)
@@db = standard_connection(:pool_size => 10, :timeout => 30).db(MONGO_TEST_DB)
@@coll = @@db.collection('thread-test-collection')
def set_up_safe_data
@ -21,16 +21,23 @@ class TestThreading < Test::Unit::TestCase
end
def test_safe_update
times = []
set_up_safe_data
threads = []
100.times do |i|
threads[i] = Thread.new do
10.times do
if i % 2 == 0
assert_raise Mongo::OperationFailure do
t1 = Time.now
@unique.update({"test" => "insert"}, {"$set" => {"test" => "update"}}, :safe => true)
times << Time.now - t1
end
else
t1 = Time.now
@duplicate.update({"test" => "insert"}, {"$set" => {"test" => "update"}}, :safe => true)
times << Time.now - t1
end
end
end
end