Sandbox to stress AWS SDK. The SDK will automatically retry requests if your hitting the API too frequently, but only 3 times by default. This sometimes is insufficient.

AWSSDKStressTest.java

import java.util.Date;
import java.util.Map;
import java.lang.Thread;

import com.amazonaws.ClientConfiguration;
import com.amazonaws.auth.BasicAWSCredentials;
import com.amazonaws.regions.Region;
import com.amazonaws.regions.Regions;
import com.amazonaws.services.cloudformation.AmazonCloudFormation;
import com.amazonaws.services.cloudformation.AmazonCloudFormationClient;
import com.amazonaws.retry.RetryPolicy;

public class AWSSDKStressTest {

  private static final int SOCKET_TIMEOUT_IN_MILLIS = 120000;
  private static final int MAX_ERROR_RETRIES = 10;

  private static final String AWS_ACCESS_KEY_ID = "AWS_ACCESS_KEY_ID";
  private static final String AWS_SECRET_ACCESS_KEY = "AWS_SECRET_ACCESS_KEY";
  
  public static void main(String[] args) {    
      
    int t = 10;
    System.out.println("Going to spawn " + t + " threads...");

    for (int i=0; i<t; i++) {
      Thread thread = new Thread() {
        public void run() {
          String accessKeyId = System.getenv().get(AWS_ACCESS_KEY_ID);
          String secretKey = System.getenv().get(AWS_SECRET_ACCESS_KEY);

          BasicAWSCredentials creds = new BasicAWSCredentials(accessKeyId, secretKey); 

          ClientConfiguration config = new ClientConfiguration().withSocketTimeout(SOCKET_TIMEOUT_IN_MILLIS).withMaxErrorRetry(MAX_ERROR_RETRIES);
          AmazonCloudFormation client = new AmazonCloudFormationClient(creds, config); 

          client.setRegion(Region.getRegion(Regions.fromName("us-east-1")));

          int n = 5;
          System.out.println("Going to call listStacks " + n + " times...");    
          for (int j=0; j<n; j++) {
            System.out.println("[" + getName() + "] Call #" + (j+1) + " @" + new Date());
            client.listStacks();    
          }
          System.out.println("[" + getName() + "] Done.");    
        }
      };
      thread.start();
    }    
  }
}