dirty notes

Author: Stas Makarov

aerospike.org

@@ -0,0 +1,17 @@
+* Aerospike 
+
+** Main concepts
+
+bin -- aka column in SQL
+record -- like record or string in SQL
+set -- wtf
+
+
+http://www.aerospike.com/docs/architecture/data-model.html
+
+
+
+** Start aerospike manager console on Mac 
+sudo /Library/amc/amc
+
+

ansible.org

@@ -0,0 +1,20 @@
+* Ansible
+** Fact
+system and environment information ansible gathers ("context") before running Tasks
+** Module
+What runs tasks
+** Task
+are idempotent
+** Handler
+A Handler is exactly the same as a Task (it can do anything a Task can), but it will run when called by another Task. You can think of it as part of an Event system; A Handler will take an action when called by an event it listens for.
+** Role
+** Playbook
+
+Run a playbook
+
+    ansible-playbook [-i inventory.yml] playbook.yml
+
+** Best practices
+https://www.ansible.com/blog/ansible-best-practices-essentials
+https://docs.ansible.com/ansible/latest/user_guide/playbooks_best_practices.html#directory-layout
+

apollo.org

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+https://blog.apollographql.com/query-batching-in-apollo-63acfd859862
+
+https://medium.com/@dcdigital72/graphql-one-query-to-rule-them-all-batching-vs-merging-d216e6acb218

archlinux.org

@@ -0,0 +1,6 @@
+* Printer 
+** WIFI
+https://wiki.archlinux.org/index.php/Avahi#Hostname_resolution
+
+* SSH agent https://wiki.archlinux.org/index.php/SSH_keys#ssh-agent
+* pacman 

awk.md

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+# Add a string to each line 
+
+awk '{print $0"extra_string"}' yourFile

clojure/clojure.org

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+* Anonymous functions 
+** Alternative syntax 
+    ~#(+ 3 %)~
+
+% for single argument; %1, %2, etc for more then one argument

console.md

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+## Hanged ssh
+https://serverfault.com/questions/283129/why-do-consoles-sometimes-hang-forever-when-ssh-connection-breaks
+	
+To exit from hanged ssh session enter: `Enter ~ .`
+
+	

dbs.org

@@ -0,0 +1,22 @@
+* Column oriented DBs (CODBs)
+
+** Row oriented DBs (usual DBs)
+Locality of reference: data of one row stored near.
+
+Getting data from one column is faster in CODBs, but getting data from
+one rows is usually slower.
+
+** Implementations
+
+OSS: ClickHouse, Apache HBase, some Postgres extension, some MariaDB extension.
+
+PaaS: Amazon, Microsoft, Google and Oracle has some shit.
+
+Proprietary: Vertica, many others
+
+
+https://en.wikipedia.org/wiki/Column-oriented_DBMS
+https://en.wikipedia.org/wiki/List_of_column-oriented_DBMSes
+
+
+

docker/docker_main.org

@@ -2,6 +2,7 @@
 
 systemctl start docker
 
+
 docker info
 
 * Commands
@@ -162,3 +163,17 @@ docker-compose -f file1.yml file2.yml
 file1.yml -- base file. All paths must be relative to it.
 
 
+
+* Docker hub
+
+* show container IPs 
+# show all running container's names and ips
+docker ps -q | xargs -n 1 docker inspect --format '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}} {{ .Name }}' | sed 's/ \// /'
+
+* Images
+** Remove untagged
+
+docker rmi $(docker images | grep "^<none>" | awk "{print $3}")
+
+* Space usage
+docker system df

elm-main.org

@@ -0,0 +1,52 @@
+* Elm
+
+** Core language
+
+
+*** Values 
+*** Functions
+fun arg = arg + "somethings"
+
+**** Anonymous Function 
+
+\arg1 arg2 -> (arg1 + arg2) /2 
+
+
+All function are anonymous functions
+
+
+
+
+
+*** Lists
+Different number of values of same type 
+
+l = [34, 234, 455]
+
+l = ["grey", "blue"]
+
+
+*** Tuples
+Different number of values of different types
+
+t = (34, "Stas")
+
+*** Records
+
+Simular to objects 
+
+me = { name = "Stas", sex = False }
+
+me.name 
+
+.name me (interesting shit)
+
+
+** Types
+*** Type annotations 
+
+Line before function definition: 
+
+fun : number -> number
+fun a = a + 2 
+

emacs/.#contribute.md

@@ -32,3 +32,9 @@ C-x SPC
 auto-fill-mode -- that's what I searched for so long
 C-x f -- set-fill-column
 M-q -- fill paragraph
+* remote files
+https://www.gnu.org/software/emacs/manual/html_node/emacs/Remote-Files.html
+
+/ssh:user@host:filename 
+* rectangle
+** string-insert-rectangle

emacs/.#delete-whitespaces-in-the-beggining-of-string.md

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+insert tag:  C-c C-c   (only on heading)
+
+search tag: C-c \ 

emacs/.#emacs-help.md

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+http://stackoverflow.com/questions/1753070/git-ignore-files-only-locally
+
+
+    git update-index --assume-unchanged [<file>...]
+
+
+    git update-index --skip-worktree FILENAME
+
+
+
+

emacs/.#emacs.md

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+* Go
+  
+** Some links
+   [[https://github.com/a8m/go-lang-cheat-sheet][cheat-sheet]]
+   https://golang.org/doc/effective_go.html
+   http://jordanorelli.com/post/32665860244/how-to-use-interfaces-in-go
+   
+** How to set up environment
+   [[https://golang.org/doc/code.html][How to write Go code]]
+   export GOPATH=$HOME/work
+   export PATH=$PATH:$GOPATH/bin:/usr/local/go/bin/
+   
+
+
+Has lamda function, 
+
+Variable arguments
+
+First arguments, then return values
+
+Lexically (normally) scoped 
+
+
+Types, structs and other shit 
+   
+   
+
+
+** Maps
+https://blog.golang.org/go-maps-in-action
+
+You can use structs as keys (also int, strings, pointers ... )
+
+
+
+
+** Go concurrency patterns [[https://www.youtube.com/watch?v%3Df6kdp27TYZs&list%3DPLP2uClub0uTrfY7bIpP985bkU6L9wqhVD&index%3D1][video]]
+
+
+** Generator 
+Function which generates a channel
+
+** Multiplexer
+Takes several channels, returns one
+** Tests
+*** go test ./... runs in parallel
+If it's not what you want (in this case your tests are probably suck) then use `-p` flag.

emacs/.#main.md

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+* Что такое модули ? 
+
+Набор связных пакетов.
+Версионирован. 
+
+go.sum не лок файл (?)
+
+если хотим поправить мажорную версию, то нужно поправить в пути. А что если 0, 1?
+т.е. как происходит выбор версии если в импорте она не указана, а у пакета есть версии 0, 1?
+
+компроментация пакетов (?) в контексте папки вендор (есть же go.sum?)
+
+нп полная задача (?)
+
+
+** Итоги 

emacs/.#my-emacs-organization.org

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+* testify
+run one test:
+`-testify.m` flag

emacs/.#rectangles.org

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+* Wire
+wire - DI container with code-generation.
+** Сравнение Wire с остальными (Uber's dig and Facebook's inject)
+Wire использует кодогенерацию, вместо runtime-reflection. 
+Преимущества: 
+- проще разбираться и дебажить, значительно меньше магии
+- будет ругаться при компиляции на лишние/отсутствующие зависимости
+- не нужно выдумывать имена для объектов контейнера
+- сгенерированный код -- обычный читаемый Go-код. Который из коробки поддерживается стандартным тулингом (
+  поиск использования, объявления, переименования, ...)
+
+** Основные понятия (concepts)
+*** Provider 
+Regular Go function that returns value. Written by hand.
+Like a constructor (?).
+*** Injector
+You write injector signature by hand (some func containing ~wire.Build~), then after 
+running ~wire~ in app directory you get generated injector.
+
+Arguments to wire.Build are the same as wire.NewSet: they form a provider set.
+
+Any non-injector declarations found in a file with injectors will be copied into the generated file.
+
+** API
+*** wire.Struct()
+have to use ~new(Smth)~, not ~&Smth{}~
+
+use ~wire.Struct(new(Smth), for injecting all fields)
+
+
+*** ProviderSet
+
+** Resources
+Введение: https://blog.golang.org/wire 
+АПИ: https://godoc.org/github.com/google/wire
+Github: https://github.com/google/wire
+Tutorial: https://github.com/google/wire/tree/master/_tutorial
+Docs: https://github.com/google/wire/tree/master/docs
+Big sample application: https://github.com/google/go-cloud/tree/master/samples/guestbook

emacs/.#resize-windows.md

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+* Queries
+Executed in parallel
+
+* Mutaions 
+Executed sequentially
+
+* Frontend
+https://dev-blog.apollodata.com/the-concepts-of-graphql-bc68bd819be3
+** libs
+*** Apollo Client
+*** Relay

emacs/emacs-main.org

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+* kafka
+** Therminology
+- topic
+- partition
+- broker 
+- cluster
+

emacs/org-mode/org-mode-main (urf-pc's conflicted copy 2016-10-30).org

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+* field like 
+use "*desired query*"

git/.#git.md

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+SELECT strftime('%Y-%m', datetime(timestamp/1000, 'unixepoch')) as month, count(word) FROM words group by month order by month;