The correct way to use new DocumentClient() - amazon-web-services

Question

I see the following error occasionally in my ec2 instance that uses DynamoDB heavily
{ message: 'Could not load credentials from any providers',
code: 'CredentialsError',
errno: 'ECONNREFUSED',
syscall: 'connect',
address: '169.254.169.254',
port: 80,
time: 2018-07-05T10:02:37.690Z,
originalError:
{ code: 'ECONNREFUSED',
errno: 'ECONNREFUSED',
syscall: 'connect',
address: '169.254.169.254',
port: 80,
message: 'connect ECONNREFUSED 169.254.169.254:80' } } }
The way I am using the AWS sdk to connect and get data from DynamoDB is like the following
'use strict'
const BluebirdPromise = require('bluebird')
AWS.config.setPromisesDependency(BluebirdPromise)
const DocumentClient = AWS.DynamoDB.DocumentClient
class DynamoOne {
get({
key
}) {
return new DocumentClient().get({ // creating new instance every time i want to get Item
Key: key,
TableName: 'TABLE_NAME',
ConsistentRead: consistent,
})
.promise()
.catch(e => console.trace(key, e))
}
}
new DynamoOne.get({
id: 1
}).then((item) => {
console.log(1, item)
})
Is this the correct way to use it ? or I should create new DocumentClient() once and use it all over , like the following code
'use strict'
const BluebirdPromise = require('bluebird')
AWS.config.setPromisesDependency(BluebirdPromise)
const DocumentClient = new AWS.DynamoDB.DocumentClient() // creating new instance once
class DynamoTwo {
get({
key
}) {
return DocumentClient.get({ // reuse DocumentClient
Key: key,
TableName: 'TABLE_NAME',
ConsistentRead: consistent,
})
.promise()
.catch(e => console.trace(key, e))
}
}
new DynamoTwo.get({
id: 1
}).then((item) => {
console.log(1, item)
})
Which one is the correct one DynamoOne or DynamoTwo ?

Answer 1

After researching and asking in github aws repo
I found that the correct way is to use DynamoTwo