eiri

CouchDB view compaction

Sequence diagram of CouchDB 2.0 compaction

Diaglam of calls during view compaction in CouchDB 2.0. Some steps omitted to simplify things.

View: http://bl.ocks.org/eiri/c436914e4115651c78d1eef9de68c70e

eiri

Example of using js-sequence diagram in gist

How to share

Bl.ocks is a nice way for sharing code examples hosted on gitHub gist. All that needed is just to replace “gist.github.com” with “bl.ocks.org” in the URL, e.g. http://bl.ocks.org/eiri/073a9e12f8246927ef997bf6f3ab5561

Sequence file loading

Sequence is just a simple text file loaded with syncronious ajax call.

eiri

.vagrant/
git/

eiri

$ tree ~/.httpie/
/Users/eiri/.httpie/
├── config.json
└── sessions
    └── localhost_5984
        └── default.json

eiri

$ http :5984
{
    “couchdb”: “Welcome”,
    “uuid”: “6c77bce10369b93fa79b8488f1e25444”,
    “vendor”: {
        “name”: “Homebrew”,
        “version”: “1.6.1_6”
    },
    “version”: “1.6.1”
}

eiri

-define(IS_OLD_STATE(S), tuple_size(S) /= tuple_size(#state{})).

eiri

// Returns a random Emoji 🌿
extension String{
    func randomEmoji()->String{
        let range = 0x1F601...0x1F64F
        let ascii = range.startIndex + Int(arc4random_uniform(UInt32(range.count)))
        let emoji = String(UnicodeScalar(ascii))
        return emoji
    }
}

eiri

-module(demo).

-export([print/0]).

-record(magic_record, {
  alpha = 1,
  beta = b,
  gamma = [x, y, z],
  psy,
  omega = "done"

eiri

-module(mardear).

-export([readram/0]).

readram() ->
  {ok, Fd} = file:open([], [ram, write, read]),
  IoData = io_lib:format("~s", [[$r, $a, $m]]),
  ok = file:write(Fd, IoData),
  {ok, Str} = file:pread(Fd, 0, 8192),
  ok = file:close(Fd),

eiri

#!/bin/bash

# From http://tech.serbinn.net/2010/shell-script-to-create-ramdisk-on-mac-os-x/
#

ARGS=2
E_BADARGS=99

if [ $# -ne $ARGS ] # correct number of arguments to the script;
then