buivuanh

/*
Package fan is a little concurrent io experiment.

Example Use Case
----------------

You have a function that takes a single io.Reader as an argument. You would like
to pass that reader to several processing functions. You could just make the
function accept an io.ReadSeeker, invoke each function serially in a for loop,
seeking after each call. But that's not cool.

buivuanh

/*
This function will help you to convert your object from struct to map[string]interface{} based on your JSON tag in your structs.
Example how to use posted in sample_test.go file.
*/
func structToMap(item interface{}) map[string]interface{} {

	res := map[string]interface{}{}
	if item == nil {
		return res
	}

buivuanh

go test -run=. -bench=. -benchtime=5s -count 5 -benchmem -cpuprofile=cpu.out -memprofile=mem.out -trace=trace.out ./package | tee bench.txt
go tool pprof -http :8080 cpu.out
go tool pprof -http :8081 mem.out
go tool trace trace.out

go tool pprof $FILENAME.test cpu.out
# (pprof) list <func name>

# go get -u golang.org/x/perf/cmd/benchstat
benchstat bench.txt

buivuanh

Task 1: Create a project jumphost instance

Navigation menu > Compute engine > VM Instance


Task 2: Create a Kubernetes service cluster

gcloud config set compute/zone us-east1-b

gcloud container clusters create nucleus-webserver1

buivuanh

#!/bin/bash
cd /pgtap
make 
make install
make installcheck
psql -U postgres -c 'CREATE EXTENSION pgtap;'

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PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h or --help depending on your psql version):

• -E: will describe the underlaying queries of the \ commands (cool for learning!)
• -l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)

buivuanh

must to have: M
nice to have: N
optional: null

Requirement tech stack:
- DB:
  - Postgresql (M)
  - MongoDB (N)
- Cache:
  - Redis (M)