Amazon DAX Client for JavaScript

DAX is a DynamoDB-compatible caching service that enables you to benefit from fast in-memory performance for demanding applications.

This client library provides access from NodeJS to DAX.

Installing

The Amazon DAX client only runs from NodeJS, and can be installed using npm:

npm install amazon-dax-client

Usage and Getting Started

You can follow the Getting Started tutorial at:

https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/DAX.client.sample-app.html

To quickly use DAX, replace AWS.DynamoDB with AmazonDaxClient:

const AmazonDaxClient = require('amazon-dax-client');

// Replace this ...
const ddb = new AWS.DynamoDB({region: region});
/// with this ...
const endpoint = "your-cluster-discovery-endpoint";
const dax = new AmazonDaxClient({endpoints: [endpoint], region: region});

// If using AWS.DynamoDB.DocumentClient ...
const doc = new AWS.DynamoDB.DocumentClient({service: dax});

The DAX Cluster Discovery Endpoint can be found the AWS console or by using aws dax describe-clusters from the command line.

Creating a connection to your DAX cluster requires using the Cluster Discovery Endpoint URL returned in the DescribeClusters response as the endpoint.

For example:

// Format: const endpoint = <ClusterDiscoveryEndpoint.URL>;
const endpoint = 'dax://my-cluster.abc123.dax-clusters.us-east-1.amazonaws.com';

Getting Help

Please use these community resources for getting help.

• Ask a question on StackOverflow and tag it with amazon-dynamodb-dax
• Ask a question on the AWS DynamoDB forum
• Open a support ticket with AWS Support

Changes

1.2.9

• Fixed “NeedMoreData: not enough data” error in case of server sending exception-response

1.2.8

• Fixed “NeedMoreData: not enough data” error (#4038)
• Fixed erroneous validation error on duplicate attribute name values in ExpressionAttributeNames

1.2.7

• AuthenticationRequiredException is a retryable request
• Improved request routing, connection management and retry logic

1.2.6

• Add support for TLS and encrypted DAX clusters

1.2.5

• Lock antlr4 to 4.8.x to avoid breaking application running older node version when upgrading to 4.9.0
• Replace use of deprecated Buffer constructors

1.2.4

• Minor bug fixes.

1.2.3

• Retry prefer to choose a different node.
• Adjust exponential back off delay and strategy.

1.2.2

• Fix unrecoverable request timeout after DAX node restart.
• Fix connection timeout during DAX server restart.
• Allow retry for IO exceptions.
• Remove verbose connection error logs.
• Fix empty string encoding bug.

1.2.1

• Bug fix in TransactionGetItems Api to return Key element correctly.

1.2.0

• Support for DynamoDB Transaction Apis.
• Fix excessive background endpoint refresh calls.

1.1.4

• Fix connection leaks on timeout.
• Support configurable requestTimeout. (Default: 60s)

1.1.3

• Fix transient error on tube cleanup
• Fix UpdateItem result parsing with a subset of attributes changed
• Increase default connectTimeout and make it configurable

1.1.2

• Fix socket leaks on validation errors
• Fix SocketTimeout caused by connection establishment
• Fix issue with update response if the item is not changed
• Fix error decoding BatchWrite UnprocessedItems.

1.1.1

• Fix socket leaks on errors

1.1.0

• Brand new decoder for improved performance on large results
• Improved connection/timer management to allow clean exit on Lambda

1.0.2

• Improved connection/timer management to allow clean exit on Lambda

1.0.1

• Initial release