engine: failed to materialize task status after the task finished

[buchuitoudegou]

1. Create full mode dm job
2. Get job by GetJob
3. job.Detail => jobStatus

jobStatus.taskStatus["mysql-replica-01"].status:

&{ErrorMsg:client mysql-replica-01 not found Unit: Stage: Result:<nil> Status:[110 117 108 108] IoTotalBytes:0 DumpIOTotalBytes:0}

[buchuitoudegou]

/area engine
/type bug
/severity minor

[buchuitoudegou]

@GMHDBJD PTAL

[GMHDBJD]

{
    "job_id": "fec9eb43-98dc-4bcf-aae1-38bd289fb832",
    "task_status": {
        "mysql-replica-01": {
            "expected_stage": "Running",
            "worker_id": "140c8462-1436-4373-9f03-47cdc54949f7",
            "config_outdated": false,
            "status": {
                "error_message": "client is finished before receiving response",
                "unit": "",
                "stage": "",
                "result": null,
                "status": null,
                "io_total_bytes": 0
            },
            "duration": 3994677572
        }
    },
    "finished_unit_status": {
        "mysql-replica-01": [
            {
                "Unit": "DMDumpTask",
                "Task": "mysql-replica-01",
                "Stage": "Finished",
                "CfgModRevision": 0,
                "StageUpdatedTime": "2022-12-20T14:11:57.054896694Z",
                "Result": {},
                "Status": {
                    "totalTables": 1,
                    "completedTables": 1,
                    "finishedBytes": 64,
                    "finishedRows": 1,
                    "estimateTotalRows": 1,
                    "bps": 398,
                    "progress": "100.00 %"
                },
                "Duration": 3523384690
            },
            {
                "Unit": "DMLoadTask",
                "Task": "mysql-replica-01",
                "Stage": "Finished",
                "CfgModRevision": 0,
                "StageUpdatedTime": "2022-12-20T14:12:01.054749639Z",
                "Result": {},
                "Status": {
                    "finishedBytes": 64,
                    "totalBytes": 64,
                    "progress": "100.00 %",
                    "metaBinlog": "(ON.000003, 1694)",
                    "metaBinlogGTID": "259f6c3c-8070-11ed-b5c3-0242c0a8e004:1-13",
                    "bps": 81
                },
                "Duration": 3988188129
            }
        ]
    }
}

can finished_unit_status meet expectation?