复制任务设置 JSON 上的 Boto3 DMS “modify_replication_task”错误

Question

我正在使用boto3来创建DMS复制任务。我使用以下replication_task_settings.json来创建复制任务：

    {
      "TargetMetadata": {
          "TargetSchema": "",
          "SupportLobs": true,
          "FullLobMode": false,
          "LobChunkSize": 0,
          "LimitedSizeLobMode": true,
          "LobMaxSize": 256,
          "InlineLobMaxSize": 0,
          "LoadMaxFileSize": 0,
          "ParallelLoadThreads": 0,
          "ParallelLoadBufferSize": 0,
          "BatchApplyEnabled": false,
          "TaskRecoveryTableEnabled": false
      },
      "FullLoadSettings": {
          "TargetTablePrepMode": "TRUNCATE_BEFORE_LOAD",
          "CreatePkAfterFullLoad": false,
          "StopTaskCachedChangesApplied": false,
          "StopTaskCachedChangesNotApplied": false,
          "MaxFullLoadSubTasks": 8,
          "TransactionConsistencyTimeout": 1000,
          "CommitRate": 10000
      },
      "Logging": {
          "EnableLogging": true,
          "LogComponents": [
              {
                  "Id": "SOURCE_UNLOAD",
                  "Severity": "LOGGER_SEVERITY_DEFAULT"
              },
              {
                  "Id": "TARGET_LOAD",
                  "Severity": "LOGGER_SEVERITY_DEFAULT"
              },
              {
                  "Id": "SOURCE_CAPTURE",
                  "Severity": "LOGGER_SEVERITY_DEFAULT"
              },
              {
                  "Id": "TARGET_APPLY",
                  "Severity": "LOGGER_SEVERITY_DEFAULT"
              },
              {
                  "Id": "TASK_MANAGER",
                  "Severity": "LOGGER_SEVERITY_DEFAULT"
              }
          ],
      },
      "ControlTablesSettings": {
          "ControlSchema": "control",
          "HistoryTimeslotInMinutes": 5,
          "HistoryTableEnabled": true,
          "SuspendedTablesTableEnabled": true,
          "StatusTableEnabled": true
      },
      "StreamBufferSettings": {
          "StreamBufferCount": 3,
          "StreamBufferSizeInMB": 8,
          "CtrlStreamBufferSizeInMB": 5
      },
      "ChangeProcessingDdlHandlingPolicy": {
          "HandleSourceTableDropped": false,
          "HandleSourceTableTruncated": true,
          "HandleSourceTableAltered": false
      },
      "ErrorBehavior": {
          "DataErrorPolicy": "LOG_ERROR",
          "DataTruncationErrorPolicy": "LOG_ERROR",
          "DataErrorEscalationPolicy": "SUSPEND_TABLE",
          "DataErrorEscalationCount": 0,
          "TableErrorPolicy": "SUSPEND_TABLE",
          "TableErrorEscalationPolicy": "STOP_TASK",
          "TableErrorEscalationCount": 0,
          "RecoverableErrorCount": -1,
          "RecoverableErrorInterval": 5,
          "RecoverableErrorThrottling": true,
          "RecoverableErrorThrottlingMax": 1800,
          "ApplyErrorDeletePolicy": "IGNORE_RECORD",
          "ApplyErrorInsertPolicy": "LOG_ERROR",
          "ApplyErrorUpdatePolicy": "LOG_ERROR",
          "ApplyErrorEscalationPolicy": "LOG_ERROR",
          "ApplyErrorEscalationCount": 0,
          "ApplyErrorFailOnTruncationDdl": false,
          "FullLoadIgnoreConflicts": true,
          "FailOnTransactionConsistencyBreached": false,
          "FailOnNoTablesCaptured": false
      },
      "ChangeProcessingTuning": {
          "BatchApplyPreserveTransaction": true,
          "BatchApplyTimeoutMin": 1,
          "BatchApplyTimeoutMax": 30,
          "BatchApplyMemoryLimit": 500,
          "BatchSplitSize": 0,
          "MinTransactionSize": 1000,
          "CommitTimeout": 1,
          "MemoryLimitTotal": 1024,
          "MemoryKeepTime": 60,
          "StatementCacheSize": 50
      },
      "ValidationSettings": {
          "EnableValidation": true,
          "ValidationMode": "ROW_LEVEL",
          "ThreadCount": 5,
          "PartitionSize": 10000,
          "FailureMaxCount": 10000,
          "RecordFailureDelayInMinutes": 5,
          "RecordSuspendDelayInMinutes": 30,
          "MaxKeyColumnSize": 8096,
          "TableFailureMaxCount": 1000,
          "ValidationOnly": false,
          "HandleCollationDiff": false,
          "RecordFailureDelayLimitInMinutes": 0
      }
    }

上面的 JSON 在调用 dms_client.create_replication_task 时工作正常。但是，它在修改复制任务时不起作用。

使用上述replication_task_settings.json调用dms_client.modify_replication_task时，出现以下错误：

botocore.exceptions.ClientError: An error occurred (InvalidParameterValueException) when calling the ModifyReplicationTask operation: Invalid task settings JSON

我不确定为什么会发生这种情况，任何帮助将不胜感激！

我尝试删除一些已经默认的设置。我尝试寻找格式错误的 JSON，但没有明显的内容。

我希望该replication_task_settings,json可用于创建和修改DMS复制任务。

Answer 1

我在尝试使用 CLI 修改复制任务时遇到了类似的问题：

aws --profile non-prod dms modify-replication-task --replication-task-arn arn:aws:dms:ap-southeast-3:567384657322:task:ABC --replication-task-settings file:/json_task --region ap-southeast-3

这是错误：

调用 修改复制任务操作：无效的任务设置 JSON

以下命令有效：

aws --profile non-prod dms modify-replication-task --replication-task-arn arn:aws:dms:ap-southeast-3:567384657322:task:ABC --replication-task-settings file://json_task --region ap-southeast-3

更改是在 JSON 文件名前使用两个"//"来修改任务。

Answer 2

用于 TableMappings 的 modify_replication_task(( 的 boto3 文档建议 -- 使用 CLI 或 boto3 时，请提供包含表映射的 JSON 文件的路径。在路径前面加上 file://。例如，--表映射 file://mappingfile.json .使用 DMS API 时，请提供 JSON 作为参数值。

是的，你是绝对正确的。提供 JSON 文件作为参数适用于 CLI 中，但不适用于 boto3。在 boto3 中，它会抛出错误"无效的表映射/无效的 JSON 错误"。

请尝试以下操作以使其工作：

    import boto3
    dms_client = boto3.client('dms')
    table_mapping = {
    "rules":[
    {
    "rule-type":"selection",
    "rule-id":str(idx),
    "rule-name":str(idx),
    "object-locator":{
     "schema-name":schema_name,
     "table-name":table_name
     },
     "rule-action":"include"
     }
     ]
     }
dms_client.modify_replication_task(
ReplicationTaskArn=repl_task_arn,
TableMappings=json.dumps(table_mapping)
)

Answer 3

我

昨天遇到了类似的问题。我的 json 在 S3 中，最终解决方案只是应用 indent=4

    obj = s3.Object(bucket, key)
    new_json = obj.get()['Body'].read().decode('utf-8')
    new_json = json.loads(new_json)
    client.modify_replication_task(
    ReplicationTaskArn=taskarn,
    TableMappings=json.dumps(new_json, indent=4)
    )