Detailed explanation of the uniqueness of snowflake algorithm in springboot multi-node application

The uniqueness of the snowflake algorithm can be guaranteed in a single node, corresponding to the application in kubernetes. If it is expanded horizontally and multiple copies are performed, duplicate IDs may appear. This requires us to generate a workId according to pod_name. I still recommend that you use it.No third-party components are introducedThis problem is solved under the premise of network request, so I modified the yaml file of kubernetes.

yaml configuration of k8s

apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-app
spec:
  replicas: 3
  selector:
    matchLabels:
      app: my-app
  template:
    metadata:
      labels:
        app: my-app
    spec:
      containers:
      - name: my-container
        image: my-image:latest
        env:
        - name: POD_NAME
          valueFrom:
            fieldRef:
              fieldPath:   # Get the current one Pod Name of

String (0~1024) numeric method, through masking

public static int stringToNumber(String input) {
        // Use CRC32 to calculate the hash value of a string        CRC32 crc = new CRC32();
        byte[] bytes = (StandardCharsets.UTF_8);
        (bytes);
        // Get the hash value and limit it to 0 to 1023        long hashValue = ();
        return (int) (hashValue % 1024);
    }

Get server machine code

/**
	  * Get the machine code.
	  * @return
	  */
	public static String getUniqueMachineId() {
		StringBuilder uniqueId = new StringBuilder();
		try {
			// Get the IP address of the machine			InetAddress localHost = ();
			(()).append("_");
			// Get the network interface and get the MAC address			Enumeration&lt;NetworkInterface&gt; networkInterfaces = ();
			while (()) {
				NetworkInterface networkInterface = ();
				byte[] mac = ();
				if (mac != null) {
					for (int i = 0; i &lt; ; i++) {
						(("%02X", mac[i]));
						if (i &lt;  - 1) {
							("-");
						}
					}
					("_");
				}
			}
			// Add system information as a supplement			String osName = ("");
			String osVersion = ("");
			String userName = ("");
			(osName).append("_").append(osVersion).append("_").append(userName);
		}
		catch (Exception e) {
			();
		}
		return ();
	}

Implementation of ID generator

@Slf4j
public class IdUtils {
	static SnowFlakeGenerator snowFlakeGenerator;
	public static String generateId() {
		if (snowFlakeGenerator == null) {
			long podNameCode = stringToNumber((("POD_NAME")).orElse(stringToNumber(getUniqueMachineId())));
			("podNameCode:{}", podNameCode);
			snowFlakeGenerator = new SnowFlakeGenerator(podNameCode);
		}
		return ();
	}

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