Oleksiy Kovyrin kovyrin

This is ECE advice on how to study and succeed in school. This is a long list (copied from my Reddit post on r/ece) of things I learned over 6 years as an ECE undergraduate and masters student. Some tips are pulled from other places on this sub and around Reddit. This list is not comprehensive, has typos, and is obviously biased by personal taste... so if you have something to add please do so!

I am currently an electrical engineer at a large aerospace company, and ~~am finishing~~ finished my master's in ECE. I am was a TA for an introductory circuits course and want to give the students some tips. These are things I wish I knew when I was at their stage.

I am on Twitter nowadays, hit me up if you are struggling and I'll try to help out!

If you do some of these, you'll be better off. It's not a laundry list of everything you should do, it's just a reference if you need some tips. H

Scale Summit 2014

Intro, MBS

Chatham House Rule, so no attribution of ideas to people or companies

ideas for sessions

bootstrapping environments (without object stores)
service discovery
removing spofs

#Devops and Networking

Proposal: Native Docker Multi-Host Networking #8951 Proposal: Native Docker Multi-Host Networking #8951

DevOps Road Blocks DOES14 - John Willis - DevOps Road Blocks

Managing Open vSwitch across a large heterogenous fleet Managing Open vSwitch across a large heterogenous fleet - Rackspace Openstack Summit Paris

303 See Other

Location: https://github.com/wsargent/docker-cheat-sheet

Hi there!

The docker cheat sheet has moved to a Github project under https://github.com/wsargent/docker-cheat-sheet.

Please click on the link above to go to the cheat sheet.

Tuning Storm+Trident

Tuning a dataflow system is easy:

The First Rule of Dataflow Tuning:
* Ensure each stage is always ready to accept records, and
* Deliver each processed record promptly to its destination

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)

db-charmer

The Problem

If you're unfamiliar with the issue, there is an intermittent failure when running Capybara tests on any machine (spec/requests/ or features/):

undefined method `db_charmer_connection_name' for #<ActiveRecord::ConnectionAdapters::Mysql2Adapter:0x00000009f16ec8>
/var/lib/jenkins/.rvm/gems/ruby-1.9.3-p0/gems/db-charmer-1.7.0/lib/db_charmer/active_record/class_attributes.rb:85:in `db_charmer_remapped_connection'

	before 'deploy', 'deploy:good_luck'
	before 'deploy:migration', 'deploy:good_luck'

	task :good_luck, roles: :app, except: { no_release: true } do
	if Time.now.wday == 5
	logger.debug('')
	logger.debug('┓┏┓┏┓┃')
	logger.debug('┛┗┛┗┛┃＼○／')
	logger.debug('┓┏┓┏┓┃ / Friday')
	logger.debug('┛┗┛┗┛┃ノ)')

	/*
	* Copyright (c) 2014 Scott Vokes <[email protected]>
	*
	* Permission to use, copy, modify, and/or distribute this software for any
	* purpose with or without fee is hereby granted, provided that the above
	* copyright notice and this permission notice appear in all copies.
	*
	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR

	input {
	syslog {
	type => "haproxy-access"
	port => 514
	}
	}

	filter {
	grok {
	type => "haproxy-access"