dynamo-local | 易学教程

Amazon DynamoDB Local - unknown error, exception or failure

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问题 I have to test an application which relies heavily on Amazon's DynamoDB. I want the tests to be able to be run separately, which is why I opted for DynamoDB Local .jar . I am aware of the recent update, making us able to run this without an external bash command call. However, when I try to run the example, that was specified here, i get the following stacktrace: Exception in thread "main" com.amazonaws.AmazonServiceException: The request processing has failed because of an unknown error,

Error while using DynamoDB AWS SDK [No Mapping for Hash Key] because of naming convention

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问题 While using AWS JAva SDK, for defining DynamoDBHashKey we @DynamoDBHashKey annotation. Strangely if i use annotation as below @DynamoDBHashKey String Abc instead of @DynamoDBHashKey String abc this gives me an error, no mapping for HASH key [junit] at com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapperTableModel.hashKey(DynamoDBMapperTableModel.java:119) [junit] at com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapperTableModel$Builder.build(DynamoDBMapperTableModel.java:449

how to update item in dynamoDB using nodejs?

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问题 how do i update item in dynamoDB using nodejs ? here is the ITEM list from DynamoDB javascript shell - "Items": [ { "EmailId": "swa@acc.com", "flag": 1, "deviceOS": "IOS", "companyName": "VCC", "snsEndpoint": "00d0sadas", "CreatedAt": 22112015, "Otp": "ABCDEF", }, i want to update flag value to 2 ... this is my code . what do i do?? what am i doing wrong ?? help is appreciated... var params = { TableName: 'users', Key: { id: { 'S': req.query.id }, flag: { 'N': 2 } }, UpdateExpression: 'SET

How to get optimal bulk insertion rate in DynamoDb through Executor Framework in Java?

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问题 I'm doing a POC on Bulk write (around 5.5k items) in local Dynamo DB using DynamoDB SDK for Java. I'm aware that each bulk write cannot have more than 25 write operations, so I am dividing the whole dataset into chunks of 25 items each. Then I'm passing these chunks as callable actions in Executor framework. Still, I'm not having a satisfactory result as the 5.5k records are getting inserted in more than 100 seconds. I'm not sure how else can I optimize this. While creating the table I

how to select an element from json array and display on html using nodejs

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问题 I have a table in DynamoDB local named userGroup. The items are as follows { "Items": [{ "id": "A004", "name": "ACC LR2", "userId": ["1", "2", "3", "4"], { "id": "0001", "name": "ABG IT", "userId": ["8", "9", "10", "11"] } }] } There are more than 20 lines like this. This is an entire row { "id": "A004", "name": "ACC LR2", "userId": ["1", "2", "3", "4"] } this is my routes users.js router.get('/groups', function (req, res, next) { var params = { TableName: 'userGroup', }; dynamodb.scan(params

how to select an element from json array and display on html using nodejs

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DynamoDBLocal in sbt dependencies

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问题 I've added "com.amazonaws" % "dynamodb-titan100-storage-backend" % "1.0.0" to my dependencies and the build broke because of com.amazonaws#DynamoDBLocal;[1.10.5.1, 2.0.0): not found . I've fixed this by adding mavenLocal resolver(I have built dynamodb-titan100-storage-backend localy earlier) but it is not the best solution, I think. dynamodb-titan100-storage-backend has additional repository called "AWS DynamoDB Local Release Repository" in pom.xml pointing to http://dynamodb-local.s3-website

Is there a way to set up DynamoDB Local with the Laravel AWS SDK?

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问题 I have run into problems trying to get DynamoDB Local up and running with my current laravel project. The Laravel AWS SDK allows for a few keys to be set in the .env file to change the key/secret/region, but does not seem to support changing the endpoint, and that would be needed to use DynamoDB Local (key options are in the readme here: https://github.com/aws/aws-sdk-php-laravel). The documentation for the regular PHP SDK seems pretty straight-forward about how to set up Dynamo DB Local:

How to get optimal bulk insertion rate in DynamoDb through Executor Framework in Java?

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I'm doing a POC on Bulk write (around 5.5k items) in local Dynamo DB using DynamoDB SDK for Java. I'm aware that each bulk write cannot have more than 25 write operations, so I am dividing the whole dataset into chunks of 25 items each. Then I'm passing these chunks as callable actions in Executor framework. Still, I'm not having a satisfactory result as the 5.5k records are getting inserted in more than 100 seconds. I'm not sure how else can I optimize this. While creating the table I provisioned the WriteCapacityUnit as 400(not sure what's the maximum value I can give) and experimented with

Error InvalidParameterType: Expected params.Item['pid'] to be a structure in DynamoDB

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问题 Note: all these are happening on the local instance of DynamoDB. This is the code that I've used to create a table from the DynamoDB Shell: var params = { TableName: "TABLE-NAME", KeySchema: [ { AttributeName: "pid", KeyType: "HASH" } ], AttributeDefinitions: [ { AttributeName: "pid", AttributeType: "S" } ], ProvisionedThroughput: { ReadCapacityUnits: 1, WriteCapacityUnits: 1 } }; dynamodb.createTable(params, function(err, data) { if (err) console.log(JSON.stringify(err, null, 2)); else