MySQL-MySQL full copy triggers OOM

[LordofAvernus]

Description

Steps to reproduce the issue

1. create a big database
   SQL：

2. create MySQL-MySQL job
   job_json:

      {
            "job_id":"mySQL",
            "src_task":{
                "connection_config":{
                    "database_type":"MySQL",
                    "host":"10.186.61.106",
                    "port":33061,
                    "user":"root",
                    "password":"***QJlyoKkG3GMu8dLL1Fq7AmQittyJJabPFYwDUyG0c="
                },
                "node_id":"",
                "mysql_src_task_config":{
                    "gtid":""
                },
                "drop_table_if_exists":true,
                "binlog_relay":false,
                "repl_chan_buffer_size":120,
                "group_max_size":1,
                "group_timeout":100,
                "chunk_size":2000,
                "task_name":"src",
                "skip_create_db_table":false,
              "replicate_do_db": [
         ]
        },
            "is_password_encrypted":true,
            "dest_task":{
                "connection_config":{
                    "database_type":"MySQL",
                    "host":"10.186.61.106",
                    "port":33062,
                    "user":"root",
                    "password":"***2fT/6DZAvKD13Hyk2kIbIAY="
                },
                "node_id":"",
                "mysql_dest_task_config":{
                },
                "task_name":"dest"
            },
            "task_step_name":"job_stage_incr",
            "failover":true,
            "retry":2
        }

3. curl -X POST "http://10.186.61.75:8190/v2/job/sync/create" -H "accept: application/json" -H "Authorization: $token" -H "Content-Type: application/json" -d "$job_json"

Describe the results you received

Describe the results you expected

Insufficient memory to pause replication

Output of ./dtle version:**

9.9.9.9-master-40fbcbe8

Additional information

[]# free -h
total used free shared buff/cache available
Mem: 15G 2.3G 12G 532K 678M 12G
Swap: 0B 0B 0B