DTLE: Memory error，when the amount of data is too large，the dtle is 'panic'

[yaqigithub]

Description
When table has a large data,change some data ,the dtle is 'panic'.

Steps to reproduce the issue:
1.create a table in Src schema whit 100w data ,

create database dataTest;
use dataTest;
create table `tl`( `id` int(10) NOT NULL, `txt` VARCHAR(50) NOT NULL, `student` VARCHAR(50) NOT NULL, PRIMARY KEY (`id`));
delimiter //
CREATE PROCEDURE tl()
     begin
    declare v int default 1;
     while v <1000001
     do 
     insert into tl 
     values(v,'ttt','hg');
     set v=v+1;
     end while;
     end 
     //
delimiter ;
call  tl();

2.create a schema level job
job.json.txt

3.execute some DML
UPDATE tl set txt=REPLACE(txt,'yyy','huhu');

Describe the results you received:
The dtle is 'panic'

Describe the results you expected:
Gave some errorlog ang dtle is normal operation
Output of ./dtle version:

Dtle 2.19.05.0 (git: 2.19.05.0 6597c279707070cf5217082a229e4b592788ea2d)

Additional information you deem important (e.g. issue happens only occasionally):

Additional details (log, config, job config etc):
1.

2019/06/18 11:14:18.840093 [INFO] [jobid:5e21c11c-d9d4-3973-373b-7818599454a0] mysql.applier: Initiated on 172.100.9.2:3306, version 5.7.23-log 
2019/06/18 11:14:18.840153 [ERR] [jobid:5e21c11c-d9d4-3973-373b-7818599454a0] mysql.applier: Can't connect nats server nats://. make sure a nats streaming server is 
running.nats: no servers available for connection 
2019/06/18 11:14:18.840209 [DEBUG] setState 4 
2019/06/18 11:14:18.840235 [DEBUG] setState.SaveState 
2019/06/18 11:14:18.840302 [INFO] [jobid:5e21c11c-d9d4-3973-373b-7818599454a0] mysql.applier: Shutting down 
2019/06/18 11:14:18.840391 [DEBUG] Worker.SaveState: lock: 0xc00039a310, 0xc000018d60 
2019/06/18 11:14:18.840402 [DEBUG] Worker.SaveState: after lock: 0xc00039a310 
2019/06/18 11:14:18.840413 [DEBUG] Worker.SaveState: after unlock: 0xc00039a310 
2019/06/18 11:14:18.840421 [DEBUG] updater 
2019/06/18 11:14:18.840443 [ERR] agent: Task "Dest" for alloc "3bbe9e9f-4ebd-1bef-08bb-45264c5637c1" failed: Wait returned exit code 2, and error nats: no servers av
ailable for connection 
2019/06/18 11:14:18.840456 [INFO] agent: Not restarting task: Dest for alloc: 3bbe9e9f-4ebd-1bef-08bb-45264c5637c1  
2019/06/18 11:14:18.840464 [DEBUG] setState restart 1 
2019/06/18 11:14:18.840474 [DEBUG] setState.SaveState 

[yaqigithub]

solve in Dtle 9.9.9.9 (git: master 30212e7)