我需要使用 YCSB 对 DynamoDB 进行基准测试，并尝试第一次使用 YCSB。
dynamo 提供的吞吐量为 100 个 RCU 和 50 个 WCU。以下是我正在执行的命令：
./bin/ycsb load dynamodb -P dynamodb-binding/conf/dynamodb.properties -P workloads/workloada -threads 1 -target 40
属性文件定义了端点 (us-east-1)、aws 凭证等。我可以使用插入运行 ycsb shell：
./bin/ycsb shell dynamo
表模式只有一个名为：partition_key 的字段。由于 dynamo 是无模式的，YCSB 可以添加任何列，这应该不是问题。但是当我尝试执行加载时，出现以下错误：
./bin/ycsb load dynamodb -P dynamodb-binding/conf/dynamodb.properties -P workloads/workloada -threads 1 -target 40
java -cp /opt/ycsb-0.12.0/dynamodb-binding/conf:/opt/ycsb-0.12.0/conf:/opt/ycsb-0.12.0/lib/core-0.12.0.jar:/opt/ycsb-0.12.0/lib/HdrHistogram-2.1.4.jar:/opt/ycsb-0.12.0/lib/htrace-core4-4.1.0-incubating.jar:/opt/ycsb-0.12.0/lib/jackson-core-asl-1.9.4.jar:/opt/ycsb-0.12.0/lib/jackson-mapper-asl-1.9.4.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-api-gateway-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-autoscaling-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-cloudformation-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-cloudfront-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-cloudhsm-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-cloudsearch-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-cloudtrail-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-cloudwatch-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-cloudwatchmetrics-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-codecommit-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-codedeploy-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-codepipeline-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-cognitoidentity-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-cognitosync-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-config-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-core-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-datapipeline-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-devicefarm-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-directconnect-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-directory-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-dynamodb-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-ec2-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-ecr-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-ecs-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-efs-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-elasticache-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-elasticbeanstalk-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-elasticloadbalancing-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-elasticsearch-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-elastictranscoder-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-emr-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-events-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-glacier-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-iam-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-importexport-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-inspector-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-iot-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-kinesis-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-kms-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-lambda-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-logs-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-machinelearning-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-marketplacecommerceanalytics-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-opsworks-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-rds-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-redshift-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-route53-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-s3-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-ses-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-simpledb-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-simpleworkflow-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-sns-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-sqs-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-ssm-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-storagegateway-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-sts-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-support-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-swf-libraries-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-waf-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/aws-java-sdk-workspaces-1.10.48.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/commons-codec-1.6.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/commons-logging-1.1.3.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/dynamodb-binding-0.12.0.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/httpclient-4.3.6.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/httpcore-4.3.3.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/jackson-annotations-2.5.0.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/jackson-core-2.5.3.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/jackson-databind-2.5.3.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/joda-time-2.8.1.jar:/opt/ycsb-0.12.0/dynamodb-binding/lib/log4j-1.2.17.jar com.yahoo.ycsb.Client -db com.yahoo.ycsb.db.DynamoDBClient -P dynamodb-binding/conf/dynamodb.properties -P workloads/workloada -threads 1 -target 40 -load
YCSB Client 0.12.0
Command line: -db com.yahoo.ycsb.db.DynamoDBClient -P dynamodb-binding/conf/dynamodb.properties -P workloads/workloada -threads 1 -target 40 -load
Loading workload...
Starting test.
0 [Thread-1] INFO com.yahoo.ycsb.db.DynamoDBClient -dynamodb connection created with http://dynamodb.us-east-1.amazonaws.com
DBWrapper: report latency for each error is false and specific error codes to track for latency are: []
435 [Thread-1] ERROR com.yahoo.ycsb.db.DynamoDBClient -com.amazonaws.AmazonServiceException: One or more parameter values were invalid: Missing the key partition_key in the item (Service: AmazonDynamoDBv2; Status Code: 400; Error Code: ValidationException; Request ID: BOJ5PRDH5N2H40TDH04ERN47BBVV4KQNSO5AEMVJF66Q9ASUAAJG)
Error inserting, not retrying any more. number of attempts: 1Insertion Retry Limit: 0
[OVERALL], RunTime(ms), 934.0
[OVERALL], Throughput(ops/sec), 0.0
[TOTAL_GCS_PS_Scavenge], Count, 1.0
[TOTAL_GC_TIME_PS_Scavenge], Time(ms), 8.0
[TOTAL_GC_TIME_%PS_Scavenge], Time(%), 0.8565310492505354
[TOTAL_GCS_PS_MarkSweep], Count, 0.0
[TOTAL_GC_TIME_PS_MarkSweep], Time(ms), 0.0
[TOTAL_GC_TIME%PS_MarkSweep], Time(%), 0.0
[TOTAL_GCs], Count, 1.0
[TOTAL_GC_TIME], Time(ms), 8.0
[TOTAL_GC_TIME%], Time(%), 0.8565310492505354
[CLEANUP], Operations, 1.0
[CLEANUP], AverageLatency(us), 1.0
[CLEANUP], MinLatency(us), 1.0
[CLEANUP], MaxLatency(us), 1.0
[CLEANUP], 95thPercentileLatency(us), 1.0
[CLEANUP], 99thPercentileLatency(us), 1.0
[INSERT], Operations, 0.0
[INSERT], AverageLatency(us), NaN
[INSERT], MinLatency(us), 9.223372036854776E18
[INSERT], MaxLatency(us), 0.0
[INSERT], 95thPercentileLatency(us), 0.0
[INSERT], 99thPercentileLatency(us), 0.0
[INSERT], Return=ERROR, 1
[INSERT-FAILED], Operations, 1.0
[INSERT-FAILED], AverageLatency(us), 428928.0
[INSERT-FAILED], MinLatency(us), 428800.0
[INSERT-FAILED], MaxLatency(us), 429055.0
[INSERT-FAILED], 95thPercentileLatency(us), 429055.0
[INSERT-FAILED], 99thPercentileLatency(us), 429055.0
当我们通过YCSB工作负载加载数据时，数据库中加载了什么样的数据（基本上那个数据的来源是什么）。谁能指导我了解我缺少什么？
~谢谢