connections can be removed from the pool

activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb

@@ -59,7 +59,7 @@ module ConnectionAdapters
     class ConnectionPool
       include MonitorMixin
 
-      attr_accessor :automatic_reconnect
+      attr_accessor :automatic_reconnect, :timeout
       attr_reader :spec, :connections
 
       # Creates a new ConnectionPool object. +spec+ is a ConnectionSpecification
@@ -217,6 +217,14 @@ def checkin(conn)
         end
       end
 
+      # Remove a connection from the connection pool.  The connection will
+      # remain open and active but will no longer be managed by this pool.
+      def remove(conn)
+        synchronize do
+          @connections.delete conn
+        end
+      end
+
       private
 
       def new_connection

activerecord/test/cases/connection_pool_test.rb

@@ -4,6 +4,8 @@ module ActiveRecord
   module ConnectionAdapters
     class ConnectionPoolTest < ActiveRecord::TestCase
       def setup
+        super
+
         # Keep a duplicate pool so we do not bother others
         @pool = ConnectionPool.new ActiveRecord::Base.connection_pool.spec
 
@@ -18,6 +20,23 @@ def setup
         end
       end
 
+      def teardown
+        super
+        @pool.connections.each(&:close)
+      end
+
+      def test_remove_connection
+        conn = @pool.checkout
+        assert conn.in_use?
+
+        length = @pool.connections.length
+        @pool.remove conn
+        assert conn.in_use?
+        assert_equal(length - 1, @pool.connections.length)
+      ensure
+        conn.close
+      end
+
       def test_active_connection?
         assert !@pool.active_connection?
         assert @pool.connection