Dynamic DynamoDB - lambda

Forked from the rockeee project: Dynamic DynamoDB Lambda

Use DynamoDB autoscaling with lambda.
It's Dynamic DynamoDB's lambda version.

functional/running test passed. but before use, Test it please

please give me any report/suggestion, Welcome

Feature

• autoscale DynamoDB's provisioned read/write capacity
• run by lambda functon with scheduled event

New features in this fork

• Global Secondary Index support
• Enable/Disable read/write autoscaling in config json file
• Throttle Events in CloudWatch support
• Enable/Disable throttle-read/throttle-write checking in config json file
• Added test to lambda

File Structure

• index.js - main handler & flow source. using async
• tasks.js - Detail work sources. using AWS SDK
• config.js - capacity scaling rule configuration

How to use

1. $ git clone https://github.com/touchvie/dynamic-dynamodb-lambda.git or download zip
2. $ npm install to download npm modules
3. modify config.js for your configuration.

• almost same with Dynamic DynamoDB's option

{

 "region": "us-west-2",
 "timeframeMin": 5, // evaluation timeframe (minute)
 "tables": [
 	{
 		"tableName": "testTable", // table name
 		"enable_read": 1, // value 1 activates read autoscaling, value 0 disactivates it
 		"enable_read_throttle": 0, // read throttle events autoscaling is disabled
 		"reads_upper_threshold" : 90, // read incrase threshold (%)
 		"reads_lower_threshold" : 30, // read decrase threshold (%)
 		"increase_reads_with" : 90, // read incrase amount (%)
 		"decrease_reads_with" : 30, // read decrase amount (%)
 		"base_reads" : 5,          // minimum read Capacity
 		"high_reads" : 100,        // maximum read Capacity
 		"enable_write": 0, // the following fields are ignored because write autoscaling is disabled
 		"enable_write_throttle": 0, // write throttle events autoscaling is disabled
 		"writes_upper_threshold": "",
 		"writes_lower_threshold": "",
 		"increase_writes_with": "",
 		"decrease_writes_with": "",
 		"base_writes": "",
 		"high_writes": ""
 	},
 	{
 		"tableName": "testTable1", // table name
 		"gsiName": "hash-testTable1-index", // Global Secondary Index of testTable1 table
 		"enable_read": 1,
 		"enable_read_throttle": 1, // read throttle events autoscaling is enabled
 		"reads_upper_threshold" : 90,
 		"reads_lower_threshold" : 30,
 		"increase_reads_with" : 0, // to don't scale up reads
 		"decrease_reads_with" : 0, // to don't scale down reads
 		"base_reads" : 5,
 		"high_reads" : 100,
 		"enable_write": 1, // value 1 activates write autoscaling, value 0 disactivates it
 		"enable_write_throttle": 1, // write throttle events autoscaling is enabled
 		"writes_upper_threshold" : 90, // write incrase amount (%)
 		"writes_lower_threshold" : 40, // write decrase amount (%)
 		"increase_writes_with" : 90, // write incrase amount (%)
 		"decrease_writes_with" : 30, // write incrase amount (%)
 		"base_writes" : 3, // minimum write Capacity
 		"high_writes" : 100 // maximum write Capacity
 	} 
 	//... 
 	]

}

4. deploy to lamda function with your favorite method (just zip, or use tool like node-lambda)
5. check lambda function's configuration

• memory - 128MB, timeout - 10sec
• set Cloudwatch Event Rule to run your lambda function. for detail, refer this
• set & attach role to lambda function
• example role policy

 {
 "Version": "2012-10-17",
 "Statement": [
     {
         "Sid": "",
         "Action": [
             "dynamodb:DescribeTable",
             "dynamodb:UpdateTable",
             "CloudWatch:getMetricStatistics"
         ],
         "Effect": "Allow",
         "Resource": "*"
     },
     {
         "Sid": "",
         "Resource": "*",
         "Action": [
             "logs:CreateLogGroup",
             "logs:CreateLogStream",
             "logs:PutLogEvents"
         ],
         "Effect": "Allow"
     }
 ]
}

Contributors

• AnguloHerrera anguloherrera93@gmail.com
• mlilius

Roadmap

• more stable
• add SNS noti when scaled/failed