- hackmd version: https://hackmd.io/1eeNAS1oQuSvMA0q6y_QuA?view
- gist version: https://gist.github.com/bluet/23e7697b86144561c4a3d804903d059d
[TOC]
- Extract 部份:取出要的資料、去雜訊、資料標準化、parsing...
- Transform:aggregation、mapping 、combined、Change Data Types
{ | |
"Version": "2012-10-17", | |
"Statement": [ | |
{ | |
"Action": [ | |
"s3:GetObject", | |
"s3:PutObject", | |
"s3:ListObject", | |
"s3:DeleteObject" | |
], |
[TOC]
First of all, please note that token expiration and revoking are two different things.
A JWT token that never expires is dangerous if the token is stolen then someone can always access the user's data.
Quoted from JWT RFC:
Code is clean if it can be understood easily – by everyone on the team. Clean code can be read and enhanced by a developer other than its original author. With understandability comes readability, changeability, extensibility and maintainability.
bin/kafka-topics.sh --zookeeper localhost:2181 --list
bin/kafka-topics.sh --zookeeper localhost:2181 --describe --topic mytopic
bin/kafka-topics.sh --zookeeper localhost:2181 --alter --topic mytopic --config retention.ms=1000
... wait a minute ...
Below are the Big O performance of common functions of different Java Collections. | |
List | Add | Remove | Get | Contains | Next | Data Structure | |
---------------------|------|--------|------|----------|------|--------------- | |
ArrayList | O(1) | O(n) | O(1) | O(n) | O(1) | Array | |
LinkedList | O(1) | O(1) | O(n) | O(n) | O(1) | Linked List | |
CopyOnWriteArrayList | O(n) | O(n) | O(1) | O(n) | O(1) | Array |