Amazon dynamodb DynamoDB ADD事务无明显原因地间歇性失败

我的DynamoDB有间歇性的问题，写了一堆条目。我看不出问题是什么，奇怪的是，问题发生在一个没有

条件表达式的地方。这种异常大约10次发生1次

docClient.transactionWrite（transaction.promise（）

{
    "TransactItems": [
        {
            "Update": {
                "TableName": "protect-dev-stepfunction-ScanAggregation",
                "Key": {
                    "pk": "#ScanCount#",
                    "sort": "#Total"
                },
                "UpdateExpression": "ADD queued :queued, runningFiles :runningFiles",
                "ExpressionAttributeValues": {
                    ":queued": 1,
                    ":runningFiles": 0
                },
                "ReturnValues": "UPDATED_NEW"
            }
        },
        {
            "Update": {
                "TableName": "protect-dev-stepfunction-ScanAggregation",
                "Key": {
                    "pk": "#ScanCount#",
                    "sort": "#Tenant#pwc"
                },
                "UpdateExpression": "SET isTenant = :isTenant ADD queued :queued, runningFiles :runningFiles",
                "ExpressionAttributeValues": {
                    ":queued": 1,
                    ":runningFiles": 0,
                    ":isTenant": true
                },
                "ReturnValues": "UPDATED_NEW"
            }
        },
        {
            "Put": {
                "TableName": "protect-dev-stepfunction-Jobs",
                "Item": {
                    "createdAt": "2020-05-11 05:25:58.770369",
                    "scanId": "1161",
                    "tenantId": "pwc",
                    "TaskToken": "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",
                    "priority": "3",
                    "fileId": "3179",
                    "pk": "pwc",
                    "sort": "3-1161_3179",
                    "scanStatus": "SUBMITTED",
                    "rjk": "3-1161_3179"
                },
                "ConditionExpression": "attribute_not_exists(pk) and attribute_not_exists(sort)"
            }
        }
    ]
}{
    "TransactItems": [
        {
            "Update": {
                "TableName": "protect-dev-stepfunction-ScanAggregation",
                "Key": {
                    "pk": "#ScanCount#",
                    "sort": "#Total"
                },
                "UpdateExpression": "ADD queued :queued, runningFiles :runningFiles",
                "ExpressionAttributeValues": {
                    ":queued": 1,
                    ":runningFiles": 0
                },
                "ReturnValues": "UPDATED_NEW"
            }
        },
        {
            "Update": {
                "TableName": "protect-dev-stepfunction-ScanAggregation",
                "Key": {
                    "pk": "#ScanCount#",
                    "sort": "#Tenant#pwc"
                },
                "UpdateExpression": "SET isTenant = :isTenant ADD queued :queued, runningFiles :runningFiles",
                "ExpressionAttributeValues": {
                    ":queued": 1,
                    ":runningFiles": 0,
                    ":isTenant": true
                },
                "ReturnValues": "UPDATED_NEW"
            }
        },
        {
            "Put": {
                "TableName": "protect-dev-stepfunction-Jobs",
                "Item": {
                    "createdAt": "2020-05-11 05:25:58.770369",
                    "scanId": "1161",
                    "tenantId": "pwc",
                    "TaskToken": "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",
                    "priority": "3",
                    "fileId": "3179",
                    "pk": "pwc",
                    "sort": "3-1161_3179",
                    "scanStatus": "SUBMITTED",
                    "rjk": "3-1161_3179"
                },
                "ConditionExpression": "attribute_not_exists(pk) and attribute_not_exists(sort)"
            }
        }
    ]
}

我得到了这个stacktrace：

TransactionCanceledException: Transaction cancelled, please refer cancellation reasons for specific reasons [TransactionConflict, TransactionConflict, None]
    at Request.extractError (/var/runtime/node_modules/aws-sdk/lib/protocol/json.js:51:27)
    at Request.callListeners (/var/runtime/node_modules/aws-sdk/lib/sequential_executor.js:106:20)
    at Request.emit (/var/runtime/node_modules/aws-sdk/lib/sequential_executor.js:78:10)
    at Request.emit (/var/runtime/node_modules/aws-sdk/lib/request.js:683:14)
    at Request.transition (/var/runtime/node_modules/aws-sdk/lib/request.js:22:10)
    at AcceptorStateMachine.runTo (/var/runtime/node_modules/aws-sdk/lib/state_machine.js:14:12)
    at /var/runtime/node_modules/aws-sdk/lib/state_machine.js:26:10
    at Request.<anonymous> (/var/runtime/node_modules/aws-sdk/lib/request.js:38:9)
    at Request.<anonymous> (/var/runtime/node_modules/aws-sdk/lib/request.js:685:12)
    at Request.callListeners (/var/runtime/node_modules/aws-sdk/lib/sequential_executor.js:116:18)
  message:
   'Transaction cancelled, please refer cancellation reasons for specific reasons [TransactionConflict, TransactionConflict, None]',
  code: 'TransactionCanceledException',
  time: 2020-05-11T05:26:00.972Z,
  requestId: 'ABKB5RCR30SDASOL3KGS5KEBUJVV4KQNSO5AEMVJF66Q9ASUAAJG',
  statusCode: 400,
  retryable: false,
  retryDelay: 32.29530018146246 }

TransactionCanceledException:交易已取消，具体原因请参考取消原因[TransactionConflict，TransactionConflict，None]
at Request.extractError（/var/runtime/node_modules/aws sdk/lib/protocol/json.js:51:27）
at Request.callListeners（/var/runtime/node_modules/aws sdk/lib/sequential_executor.js:106:20）
at Request.emit（/var/runtime/node_modules/aws sdk/lib/sequential_executor.js:78:10）
at Request.emit（/var/runtime/node_modules/aws sdk/lib/Request.js:683:14）
at Request.transition（/var/runtime/node_modules/aws sdk/lib/Request.js:22:10）
在AcceptorStateMachine.runTo（/var/runtime/node_modules/aws sdk/lib/state_machine.js:14:12）
at/var/runtime/node_modules/aws sdk/lib/state_machine.js:26:10
应要求。（/var/runtime/node_modules/aws sdk/lib/request.js:38:9）
应要求。（/var/runtime/node_modules/aws sdk/lib/request.js:685:12）
at Request.callListeners（/var/runtime/node_modules/aws sdk/lib/sequential_executor.js:116:18）
信息：
'交易已取消，请参考具体原因的取消原因[交易冲突，交易冲突，无]，
代码：“TransactionCanceledException”，
时间：2020-05-11T05:26:00.972Z，
requestId:'ABKB5RCR30SDASOL3KGS5KEBUJVV4KQNSO5AEMVJF66Q9ASUAJG'，
状态代码：400，
可检索：错误，
retryDelay:32.29530018146246}
错误表示这是“交易冲突”，表示在以下情况下可能发生：


项目的
PutItem
、
UpdateItem
或
DeleteItem
请求与包含相同项目的正在进行的
TransactionWriteItems
请求冲突
TransactionWriteItems
请求中的项目是另一个正在进行的
TransactionWriteItems
请求的一部分
TransactiveItems
请求中的项目是正在进行的
TransactiveWriteItems
、
BatchWriteItem
、
PutItem
、
UpdateItem
或
DeleteItem
请求的一部分

在您的情况下，它看起来像第二个场景。记录上有多少并发性？
这是正确的，有多个进程访问同一记录。如何解决这个问题？重试？@AnthonyKong是的，这将是最简单的解决方法。如果错误发生得太频繁，您可以尝试通过更改数据模型和访问模式来减轻它，从而减少受影响项的并发性，但如何实现这一点在很大程度上取决于您的用例。或者，如果可能，您可能希望避免事务，因为像
UpdateItem
这样的并发正常请求不会导致它们之间的
TransactionConflict
错误。（
UpdateItem
特别好，因为它可以在单个原子操作中读取和修改项，这对并发性非常好。）