v9n

There are three easy to make mistakes in go. I present them here in the way they are often found in the wild, not in the way that is easiest to understand.

All three of these mistakes have been made in Kubernetes code, getting past code review at least once each that I know of.

1. Loop variables are scoped outside the loop.

What do these lines do? Make predictions and then scroll down.

func print(pi *int) { fmt.Println(*pi) }

v9n

/*<?php
//*/public class PhpJava { public static void main(String[] args) { System.out.printf("/*%s",
//\u000A\u002F\u002A
class PhpJava {
    function main() {
        echo(//\u000A\u002A\u002F
        "Hello World!");
}}
//\u000A\u002F\u002A
PhpJava::main();

v9n

# Delete the possibly existing autocomplete test index
curl -X DELETE localhost:9200/autocomplete_test

# Put the config of the autocomplete index
curl -X PUT localhost:9200/autocomplete_test -d '
{
  "settings" : {
    "index" : {
      "analysis" : {
        "analyzer" : {

v9n

*
!/.gitignore
!/*.xml
!/nextBuildNumber

!/jobs
!/jobs/*
!/jobs/*/*.xml
/jobs/*/disk-usage.xml
/jobs/*/builds

v9n

Keybase proof

I hereby claim:

• I am kureikain on github.
• I am vinh (https://keybase.io/vinh) on keybase.
• I have a public key ASDSGMACn7TYwcFQB_ep9zyCAFqkXx9c3mXkjZZlYcynmAo

To claim this, I am signing this object:

v9n

- Generate YAML file to specify SSH host to get JSON and docker image

ow init

Once the ow.yml file is created you can also customize content yourself if you wanted.

---
SSH:
  User: vinh
  Host: 10.1.3.36

v9n

#MongoDB 3.2.x SSL with Letsencrypt Letsencrypt is an initative which aims to increase the use of encryption for websites. It basically allows people to apply for free certificates provided that they prove the they control the requested domain. We will look at the what is needed to secure your MongoDB installation. For more details on setting up a MongoDB server see MongoDB 3.2.x.

##Set the hostname We sould to set the hostname to match the name of the certificate we are going to optain.

sudo hostname mongo0.example.com

Then update the hostname file to set the server name permanently.

v9n

text: This text will be used if nothing else is specified.

analyzer:
    myAnalyzer:
        type: custom
        tokenizer: whitespace
        filter:
            - lowercase
            - reverse

v9n

Next Steps

• Measure time spend on index, flush, refresh, merge, query, etc. (TD - done)
• Take hot threads snapshots under read+write, read-only, write-only (TD - done)
• Adjust refresh time to 10s (from 1s) and see how load changes (TD)
• Measure time of a rolling restart doing disable_flush and disable_recovery (TD)
• Specify routing on query -- make it choose same node for each shard each time (MD)
• GC new generation size (TD)
• Warmers

• measure before/after of client query time with and without warmers (MD)

v9n

import r from 'rethinkdb';
import config from '../config';

const createDatabase = (conn, name) =>
  r.dbList().contains(name)
    .do(containsDb =>
      r.branch(
        containsDb,
        { created: 0 },
        r.dbCreate(name)