Question

我遇到了dynamodb的问题。我正在尝试验证其中包含的数据，但扫描似乎只返回数据的一个子集，这里是我用python boto绑定的代码

#!/usr/bin/python
#Check the scanned length of a table against the Table Description
import boto.dynamodb
#Connect
TABLENAME = "MyTableName"
sdbconn = boto.dynamodb.connect_to_region(
    "eu-west-1",
    aws_access_key_id='-snipped-',
    aws_secret_access_key='-snipped-')

#Initial Scan
results = sdbconn.layer1.scan(TABLENAME,count=True)
previouskey = results['LastEvaluatedKey']

#Create Counting Variable
count = results['Count']

#DynamoDB scan results are limited to 1MB but return a Key value to carry on for the next MB
#so loop untill it does not return a continuation point
while previouskey != False:
    results = sdbconn.layer1.scan(TABLENAME,exclusive_start_key=previouskey,count=True)
    print(count)
    count = count + results['Count']
    try:
        #get next key
        previouskey = results['LastEvaluatedKey']
    except:
        #no key returned so thats all folks!
        print(previouskey)
        print("Reached End")
        previouskey = False

#these presumably should match, they dont on the MyTableName Table, not even close
print(sdbconn.describe_table(TABLENAME)['Table']['ItemCount'])
print(count)

print(sdbconn.describe_table)给了我1748175和 print(count)给了我583021。我觉得这些应该永远匹配吗？（我知道6小时更新）但是在过去24小时内只添加了300行有没有人知道这是不是dynamodb的问题？或者我的代码是否有错误的假设？

Answer 1

最终弄明白，它与本地二级索引有关，它们在表格描述中显示为唯一项目，该表格有两个LSI，导致它显示实际存在的项目数量的3倍

来自dynamodb表描述和扫描计数的值不正确

1 个答案: