Aurora Serverless 不支持 Boto3 rds-data continueAfterTimeout？

Question

我正在嘗試使用 AWS rds-data api 在極光無服務器 Postgresql 中執行一些繁重的 etl。

根據AWS Rds DATA文檔， By default, a call times out if it's not finished processing within 45 seconds. However, you can continue running a SQL statement if the call times out by using the continueAfterTimeout parameter. By default, a call times out if it's not finished processing within 45 seconds. However, you can continue running a SQL statement if the call times out by using the continueAfterTimeout parameter.

我看到boto3 rds-data支持 continueAfterTimeout 參數（布爾值）。 我可以在這樣的交易中使用這個標志。

def execute_transaction_query(sql,  transaction_id):
        print(sql)
        response = rds_client.execute_statement(
            secretArn=AURORA_DB_CREDS_ARN,
            resourceArn=AURORA_DB_ARN,
            database=AURORA_DB_NAME,
            sql=sql,
            transactionId=transaction_id,
            continueAfterTimeout=True, # boolean flag to continue after timeout in theory
        )

但是，查詢在 45 秒后仍然失敗並出現錯誤

An error occurred (StatementTimeoutException) when calling the ExecuteStatement operation: Request timed out

Answer 1

好的，所以 rds-data 調用失敗的原因是continueAfterTimeout=True並不意味着 boto3 調用不會失敗，只是在數據庫上運行的 sql 查詢將繼續運行。

所以在運行 rds-data etls 時需要做的是在 try/catch 塊中執行語句：

            response = rds_client.execute_statement(
                secretArn=AURORA_DB_CREDS_ARN,
                resourceArn=AURORA_DB_ARN,
                database=AURORA_DB_NAME,
                sql=sql,
                transactionId=transaction_id,
                continueAfterTimeout=True,
            )
        except botocore.exceptions.ClientError as error:
            # aurora fails automatically after 45 seconds but continues in the db
            #https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/data-api.html
            if error.response['Error']['Code'] == 'StatementTimeoutException':
                print('QUERY TIMEDOUT AFTER MAX 45 SECONDS. THIS IS FINE')
                # arbitrary wait in case the commit transaction fails with timeout
                time.sleep(60)
            else:
                raise Exception(error)