wubin1989

// Hash 'string' to a small number (digits default: 6)
function hash(string, digits) {
  digits = digits || 6;
  var m = Math.pow(10, digits+1) - 1;
  var phi = Math.pow(10, digits) / 2 - 1;
  var n = 0;
  for (var i = 0; i < string.length; i++) {
    n = (n + phi * string.charCodeAt(i)) % m;
  }
  return n.toString();

wubin1989

package main

import (
	"context"
	"encoding/json"
	"fmt"
	"io"
	"log"
	"sync/atomic"
	"time"

wubin1989

package main

import (
	"fmt"
	"bufio"
	"os"
	"strconv"
)

func ReadLinesFromFile(file_path string) ([]string, error) {

wubin1989

Two approaches to handle error responses from Spring WebClient calls globally:

• Exceptions with webclients are all wrapped in WebClientResponseException class. So we can handle that using Spring's ExceptionHandler annotation.

• Using ExchangeFilterFunction while constructing the webclient bean.

wubin1989

global:
  scrape_interval: 10s
scrape_configs:
  - job_name: node
    static_configs:
      - targets:
        - localhost:9100
  - job_name: python-app
    static_configs:
      - targets:

wubin1989

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

wubin1989

version: "3"

services:

  # Using ElasticSearch as a storage for traces and logs
  elasticsearch:
    image: docker.elastic.co/elasticsearch/elasticsearch-oss:6.7.1
    networks:
      - elastic-jaeger
    ports:

wubin1989

# Assuming an Ubuntu Docker image
$ docker run -it <image> /bin/bash

wubin1989

package main

import (
	"fmt"
	"reflect"
)

type Aaa struct {
	a string
}

wubin1989

package hash

import (
	"crypto/md5"
	"encoding/base64"
	"reflect"
	"unsafe"
)

// Hash returns md5 hash taken from any object