Use AWS X-Ray in Lambda

Identify performance bottlenecks

Jargons

Set up, add environmental var

update .zshrc

# cd ~
# vim .zshrc
export AWS_XRAY_CONTEXT_MISSING="LOG_ERROR"

$ echo $AWS_XRAY_CONTEXT_MISSING
LOG_ERROR

Configuration

1. Maven

<dependency>
    <groupId>com.amazonaws</groupId>
    <artifactId>aws-xray-recorder-sdk-core</artifactId>
    <version>1.2.1</version>
</depe

2. Handle an exception from XRAY class

1. do export AWS_XRAY_CONTEXT_MISSING=LOG_ERROR in your terminal to fix your failing integration test

2. in buildspec.yml, fix for your CI/CD pipe line

    env:
      variables:
        AWS_XRAY_CONTEXT_MISSING: "LOG_ERROR"
   

3. TracingEnabled

Resources:
  HelloWorldAPI:
    Type: AWS::Serverless::Api
    Properties:
      StageName: v1
      TracingEnabled: true

Resources:
  HelloWorldAPIService:
    Type: 'AWS::Serverless::Function'
    Properties:
      Timeout: 900
      Environment:
        Variables:
          PARAM_NAME_DB_HOST: "awsdb.com"
          PARAM_NAME_DB_USER: "postgres"
          PARAM_NAME_DB_PASS: "password"
          PARAM_NAME_DB_PORT: "5432"
          AWS_XRAY_CONTEXT_MISSING: LOG_ERROR

Add Segment

public void myMethod(){

  AWSXRay.beginSubsegment("fetching user");
  User user = userService.getUser(userId);
  AWSXRay.endSubsegment();

  AWSXRay.beginSubsegment("fetching configs");
  Config config = configService.getConfigs(userId);
  AWSXRay.endSubsegment();
}

X-Ray vs RayGun

// todo

References

• Getting started with AWS X-Ray
• Using AWS Lambda with AWS X-Ray