姚文强 yaowenqiang

Fibers

Fibers are an abstraction over sequential computation, similar to threads but at a higher level. There are two ways to think about this model: by example, and abstractly from first principles. We'll start with the example.

(credit here is very much due to Fabio Labella, who's incredible Scala World talk describes these ideas far better than I can)

Callback Sequentialization

Consider the following three functions

Get fiddlers base64 encoded root certificate

Install fiddler winget install -e --id Telerik.Fiddler
Open fiddler and go to Tools -> Options -> HTTPS
Enable Decrypt HTTPS traffic
Click the Actions button and select Export root certificate to desktop
Right click the FiddlerRoot.cer file on the desktop and click Open with -> Crypto Shell Extensions
In the Certificate window that opens up go to Details -> Copy to File
Click Next then select Base-64 encoded X.509 (.CER) then specify the file name (E.G. FiddlerRootBase64.cer)
Click Next to create the new file

You are doing JSON APIs wrong.

When you use JSON to call an API - not a REST API, but something like JSON-RPC - you will usually want to encode one of several possible messages.

Your request body looks like this:

{
 "type": "MessageWithA",

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Presto Specific

Don’t SELECT *, Specify explicit column names (columnar store)
Avoid large JOINs (filter each table first)
- In PRESTO tables are joined in the order they are listed!!
- Join small tables earlier in the plan and leave larger fact tables to the end
- Avoid cross joins or 1 to many joins as these can degrade performance
Order by and group by take time
- only use order by in subqueries if it is really necessary
When using GROUP BY, order the columns by the highest cardinality (that is, most number of unique values) to the lowest.

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	"""
	A perl Data.Dumper clone for Python
	Author: [email protected]
	2011-07-08

	Copyright 2011 Jinyu LIU

	Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

	The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

	# Install tmux on Centos release 6.5

	# install deps
	yum install gcc kernel-devel make ncurses-devel

	# DOWNLOAD SOURCES FOR LIBEVENT AND MAKE AND INSTALL
	curl -OL https://github.com/libevent/libevent/releases/download/release-2.0.22-stable/libevent-2.0.22-stable.tar.gz
	tar -xf libevent-2.0.22-stable.tar.gz
	cd libevent-2.0.22-stable
	./configure --prefix=/usr/local

	# /etc/systemd/system/mysql_exporter.service

	[Unit]
	Description=Mysql Exporter
	Wants=network-online.target
	After=network-online.target


	[Service]
	User=root

	function drips(){
	docker ps -q \| xargs -n 1 docker inspect --format '{{ .NetworkSettings.IPAddress }} {{ .Name }}' \| sed 's/ \// /'
	}