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simplified connection pooling

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This commit is contained in:
Kyle Banker 2009-12-18 17:29:44 -05:00
parent c15e8c2d7d
commit 5c1b3aed0f
3 changed files with 19 additions and 137 deletions
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63
lib/mongo/connection.rb
View File

@ -31,7 +31,7 @@ module Mongo
STANDARD_HEADER_SIZE = 16
RESPONSE_HEADER_SIZE = 20
attr_reader :logger, :size, :host, :port, :nodes, :sockets, :checked_out, :reserved_connections
attr_reader :logger, :size, :host, :port, :nodes, :sockets, :checked_out
def slave_ok?
@slave_ok
@ -108,9 +108,6 @@ module Mongo
@size = options[:pool_size] || 1
@timeout = options[:timeout] || 1.0
# Cache of reserved sockets mapped to threads
@reserved_connections = {}
# Mutex for synchronizing pool access
@connection_mutex = Monitor.new
@ -293,49 +290,24 @@ module Mongo
@host = @port = nil
@sockets.clear
@checked_out.clear
@reserved_connections.clear
end
private
# Get a socket from the pool, mapped to the current thread.
def checkout
#return @socket ||= checkout_new_socket if @size == 1
if sock = @reserved_connections[Thread.current.object_id]
sock
else
sock = obtain_socket
@reserved_connections[Thread.current.object_id] = sock
end
sock
obtain_socket
end
# Return a socket to the pool.
def checkin(socket)
@connection_mutex.synchronize do
@reserved_connections.delete Thread.current.object_id
@checked_out.delete(socket)
@queue.signal
end
true
end
# Releases the connection for any dead threads.
# Called when the connection pool grows too large to free up more sockets.
def clear_stale_cached_connections!
keys = @reserved_connections.keys
Thread.list.each do |thread|
keys.delete(thread.object_id) if thread.alive?
end
keys.each do |key|
next unless @reserved_connections.has_key?(key)
checkin(@reserved_connections[key])
@reserved_connections.delete(key)
end
end
# Adds a new socket to the pool and checks it out.
#
# This method is called exclusively from #obtain_socket;
@ -366,10 +338,16 @@ module Mongo
# pool size has not been exceeded. Otherwise, wait for the next
# available socket.
def obtain_socket
@connection_mutex.synchronize do
connect_to_master if !connected?
start_time = Time.now
loop do
if (Time.now - start_time) > 30
raise ConnectionTimeoutError, "could not obtain connection within " +
"#{@timeout} seconds. The max pool size is currently #{@size}; " +
"consider increasing it."
end
@connection_mutex.synchronize do
socket = if @checked_out.size < @sockets.size
checkout_existing_socket
elsif @sockets.size < @size
@ -377,26 +355,9 @@ module Mongo
end
return socket if socket
# Try to clear out any stale threads to free up some connections
clear_stale_cached_connections!
next if @checked_out.size < @sockets.size
# Otherwise, wait.
if wait
next
else
# Try to clear stale threads once more before failing.
clear_stale_cached_connections!
if @size == @sockets.size
raise ConnectionTimeoutError, "could not obtain connection within " +
"#{@timeout} seconds. The max pool size is currently #{@size}; " +
"consider increasing it."
wait
end
end
end # if
end # loop
end # synchronize
end
if RUBY_VERSION >= '1.9'

10
test/threading/test_threading_large_pool.rb
View File

@ -6,7 +6,7 @@ class TestThreadingLargePool < Test::Unit::TestCase
include Mongo
@@db = Connection.new('localhost', 27017, :pool_size => 50, :timeout => 15).db('ruby-mongo-test')
@@db = Connection.new('localhost', 27017, :pool_size => 50, :timeout => 1).db('ruby-mongo-test')
@@coll = @@db.collection('thread-test-collection')
def set_up_safe_data
@ -25,7 +25,7 @@ class TestThreadingLargePool < Test::Unit::TestCase
def test_safe_update
set_up_safe_data
threads = []
100.times do |i|
1000.times do |i|
threads[i] = Thread.new do
if i % 2 == 0
assert_raise Mongo::OperationFailure do
@ -37,7 +37,7 @@ class TestThreadingLargePool < Test::Unit::TestCase
end
end
100.times do |i|
1000.times do |i|
threads[i].join
end
end
@ -45,7 +45,7 @@ class TestThreadingLargePool < Test::Unit::TestCase
def test_safe_insert
set_up_safe_data
threads = []
100.times do |i|
1000.times do |i|
threads[i] = Thread.new do
if i % 2 == 0
assert_raise Mongo::OperationFailure do
@ -57,7 +57,7 @@ class TestThreadingLargePool < Test::Unit::TestCase
end
end
100.times do |i|
1000.times do |i|
threads[i].join
end
end

79
test/unit/connection_test.rb
View File

@ -12,11 +12,6 @@ class ConnectionTest < Test::Unit::TestCase
db = Object.new
end
# Make a few methods public for these tests.
class Mongo::Connection
public :checkin, :checkout, :clear_stale_cached_connections!
end
context "Initialization: " do
context "given a single node" do
@ -60,79 +55,5 @@ class ConnectionTest < Test::Unit::TestCase
assert_equal 2500, @conn.port
end
end
context "Connection pooling: " do
setup do
TCPSocket.stubs(:new).returns(new_mock_socket)
@conn = Connection.new('localhost', 27107, :connect => false,
:pool_size => 3)
admin_db = new_mock_db
admin_db.expects(:command).returns({'ok' => 1, 'ismaster' => 1})
@conn.expects(:[]).with('admin').returns(admin_db)
@conn.connect_to_master
end
should "check out a new connection" do
socket = @conn.checkout
assert @conn.reserved_connections.keys.include?(Thread.current.object_id)
end
context "with multiple threads" do
setup do
@thread1 = Object.new
@thread2 = Object.new
@thread3 = Object.new
@thread4 = Object.new
Thread.stubs(:current).returns(@thread1)
@socket1 = @conn.checkout
Thread.stubs(:current).returns(@thread2)
@socket2 = @conn.checkout
Thread.stubs(:current).returns(@thread3)
@socket3 = @conn.checkout
end
should "add each thread to the reserved pool" do
assert @conn.reserved_connections.keys.include?(@thread1.object_id)
assert @conn.reserved_connections.keys.include?(@thread2.object_id)
assert @conn.reserved_connections.keys.include?(@thread3.object_id)
end
should "only add one socket per thread" do
@conn.reserved_connections.values do |socket|
assert [@socket1, @socket2, @socket3].include?(socket)
end
end
should "check out all sockets" do
assert_equal @conn.sockets.size, @conn.checked_out.size
@conn.sockets.each do |sock|
assert @conn.checked_out.include?(sock)
end
end
should "raise an error if no more sockets can be checked out" do
# This can't be tested with mock threads.
# Will test in integration tests.
end
context "when releasing dead threads" do
setup do
@thread1.expects(:alive?).returns(false)
@thread2.expects(:alive?).returns(true)
@thread3.expects(:alive?).returns(true)
Thread.expects(:list).returns([@thread1, @thread2, @thread3])
@conn.clear_stale_cached_connections!
end
should "return connections for dead threads" do
assert !@conn.checked_out.include?(@socket1)
assert_nil @conn.reserved_connections[@thread1.object_id]
end
end
end
end
end