mysql proxy客户端虚拟连接问题

目的：
  用mysql proxy做DB连接池使用环境：
  Linux+mysql proxy(0.6.1)使用脚本db_pool.lua，内容如下：-- connection pool
local max_total_conn =30 
-- debug
local is_debug = true--- end of configif not proxy.global.config.rwsplit then
        proxy.global.config.rwsplit = {
                cur_num = 0,
                is_debug =true 
        }
endlocal  query_time = 0
local  query_response_time =0
local  query_sum_time=0local  client_cur_num=0 ---
-- read/write splitting sends all non-transactional SELECTs to the slaves
--
-- is_in_transaction tracks the state of the transactions
local is_in_transaction = 0--- 
-- get a connection to a backend
--
-- as long as we don't have enough connections in the pool, create new connections
--
function connect_server() 
        if is_debug then
                print()
                print("[connect_server] ")
        endclient_cur_num=client_cur_num+1
print("connect client connection,client_cur_num="..client_cur_num)if proxy.global.config.rwsplit.cur_num >= max_total_conn then
        proxy.connection.backend_ndx = 1
        print("in connect: proxy.global.conn_counter arrive max, not send to mysql,proxy.global.config.rwsplit.cur_num=" .. proxy.gl
obal.config.rwsplit.cur_num .. "max_total_conn=" .. max_total_conn)
        print("useing pool...")
        return proxy.PROXY_IGNORE_RESULT
endprint("in connect proxy.global.config.rwsplit.cur_num=" .. proxy.global.config.rwsplit.cur_num .."max_total_conn=" .. max_total_conn
)
        proxy.connection.backend_ndx = 1        if is_debug then
                print("  opening new connection on: " .. proxy.connection.backend_ndx)
        end        -- open a new connection 
end-- add by tipyluo
function read_handshake( auth )
--      print("read auto result="..auth.packet:byte())
        proxy.global.config.rwsplit.cur_num = proxy.global.config.rwsplit.cur_num + 1
        print("handshake come in , proxy.global.config.rwsplit.cur_num=" .. proxy.global.config.rwsplit.cur_num)
endfunction  read_auth()
        print("readauth  come in")
end--cy
function read_auth_result( auth )
--proxy.global.config.rwsplit.cur_num = proxy.global.config.rwsplit.cur_num + 1
        print("read auto result="..auth.packet:byte())
        print("read auth result come in")
        if auth.packet:byte() == proxy.MYSQLD_PACKET_OK then
                -- auth was fine,disconnect client connection,and add to pool 
                print("read auth result come in,client connection add to pool..")
                proxy.connection.backend_ndx = 0
        endend
--- 
-- read/write splitting
function read_query( packet ) 
        --if is_debug then
        --      print("[read_query]")
        --      print("  authed backend = " .. proxy.connection.backend_ndx)
        --      print("  used db = " .. proxy.connection.client.default_db)
        --end        proxy.connection.backend_ndx=1        if packet:byte() == proxy.COM_QUIT then
                -- don't send COM_QUIT to the backend. We manage the connection
                -- in all aspects.                if proxy.global.config.rwsplit.cur_num <= max_total_conn then
                        proxy.response = {
                                type = proxy.MYSQLD_PACKET_OK,
                        }
                        print("ignore disconnect msg")
          
                        return proxy.PROXY_SEND_RESULT
                end   
        end        --don't delete the below row
        proxy.queries:append(1, packet)        --proxy.connection.backend_ndx=1
        return proxy.PROXY_SEND_QUERY
endfunction read_query_result( inj ) 
        query_time=inj.query_time / 1000
        query_response_time=inj.response_time / 1000
        --query_sum_time=query_time+query_response_time
        query_sum_time=query_response_time        if query_sum_time>1000 then
                print("sum time:"..query_sum_time.."ms")
                print("---"..inj.query)
        end
 
        if proxy.connection.backend_ndx >0 then
                proxy.connection.backend_ndx = 0
        endendfunction disconnect_client()
 --proxy.global.config.rwsplit.cur_num = proxy.global.config.rwsplit.cur_num - 1
client_cur_num=client_cur_num-1
print("disconnect client connection,client_cur_num="..client_cur_num)   if proxy.global.config.rwsplit.cur_num <= max_total_conn then
        print("disconnect client,relase connection and to pool")
        proxy.connection.backend_ndx = 0
        return proxy.PROXY_IGNORE_RESULT
   end
        print("adjust proxy.global.config.rwsplit.cur_num value: -1")
       proxy.connection.backend_ndx =1 
        proxy.global.config.rwsplit.cur_num = proxy.global.config.rwsplit.cur_num - 1end存在问题：
  当输出下述日志时，proxy与客户端的连接数会自动增加，用netstat在proxy服务器上查看端口，其状态为"ESTABLISHED"，实际上，而在客户端主机上用netstat查看，并没有建立socket连接，这是为什么？
  network-mysqld-proxy.c.3022: I have no server backend, closing connection
  network-mysqld.c.1411: plugin_call(CON_STATE_READ_QUERY) failed