Merge pull request 'Add talk made on 2023-01-18' (#482) from talk-tocatta-2023-01-18 into main

Reviewed-on: https://git.deuxfleurs.fr/Deuxfleurs/garage/pulls/482
This commit is contained in:
Alex 2023-01-20 11:40:08 +00:00
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ASSETS=assets/consistent_hashing_1.pdf \
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### (fr) Garage, un système de stockage de données géo-distribué léger et robuste
Garage est un système de stockage de données léger, géo-distribué, qui
implémente le protocole de stockage S3 de Amazon. Garage est destiné
principalement à l'auto-hébergement sur du matériel courant d'occasion. À ce
titre, il doit tolérer un grand nombre de pannes: coupures de courant, coupures
de connexion Internet, pannes de machines, ... Il doit également être facile à
déployer et à maintenir, afin de pouvoir être facilement utilisé par des
amateurs ou des petites organisations.
Cette présentation vous proposera un aperçu de Garage et du choix technique
principal qui rend un système comme Garage possible: le refus d'utiliser des
algorithmes de consensus, remplacés avantageusement par des méthodes à
cohérence faible. Notre modèle est fortement inspiré de la base de donnée
Dynamo (DeCandia et al, 2007), et fait usage des types de données CRDT (Shapiro
et al, 2011). Nous exploreront comment ces méthodes s'appliquent à la
construction de l'abstraction "stockage objet" dans un système distribué, et
quelles autres abstractions peuvent ou ne peuvent pas être construites dans ce
modèle.
### (en) Garage, a lightweight and robust geo-distributed data storage system
Garage is a lightweight geo-distributed data store that implements the Amazon
S3 object storage protocol. Garage is meant primarily for self-hosting at home
on second-hand commodity hardware, meaning it has to tolerate a wide variety of
failure scenarios such as power cuts, Internet disconnections and machine
crashes. It also has to be easy to deploy and maintain, so that hobbyists and
small organizations can use it without trouble.
This talk will present Garage and the key technical choice that made Garage
possible: refusing to use consensus algorithms and using instead weak
consistency methods, with a model that is loosely based on that of the Dynamo
database (DeCandia et al, 2007) and that makes heavy use of conflict-free
replicated data types (Shapiro et al, 2011). We will explore how these methods
are suited to building the "object store" abstraction in a distributed system,
and what other abstractions are possible or impossible to build in this model.

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After

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After

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sodipodi:role="line"
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After

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x="23.457415"
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sodipodi:role="line"
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sodipodi:role="line"
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After

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xml:space="preserve"
style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#999999;stroke-width:0.264583"
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sodipodi:role="line"
id="tspan3748-2"
style="fill:#999999;stroke-width:0.264583"
x="23.457415"
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id="text3750-0"><tspan
sodipodi:role="line"
id="tspan3748-6"
style="fill:#999999;stroke-width:0.264583"
x="23.457415"
y="41.972523">$\not\sqsupseteq \{a\}$</tspan></text>
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id="path3663-1-4"
cx="18.004833"
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sodipodi:role="line"
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sodipodi:role="line"
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sodipodi:role="line"
id="tspan3748-4"
style="fill:#999999;stroke-width:0.264583"
x="23.457415"
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sodipodi:role="line"
id="tspan3748-2-3"
style="fill:#000000;stroke-width:0.264583"
x="23.457415"
y="84.598038">$\sqsupseteq \{b\} \to$ OK</tspan></text>
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xml:space="preserve"
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sodipodi:role="line"
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x="23.457415"
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r="2.7302806" />
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style="fill:#800080;stroke:none;stroke-width:0.499999;stroke-dasharray:none;stop-color:#000000"
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xml:space="preserve"
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id="text3750-9"><tspan
sodipodi:role="line"
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style="fill:#000000;stroke-width:0.264583"
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xml:space="preserve"
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sodipodi:role="line"
style="fill:#000000;stroke-width:0.264583"
x="62.764446"
y="146.3129"
id="tspan2630">return $\{a\}$</tspan></text>
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xml:space="preserve"
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sodipodi:role="line"
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sodipodi:role="line"
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id="text3707-5-3-7"><tspan
sodipodi:role="line"
id="tspan3705-4-6-5"
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y="118.94403">$read()$:</tspan></text>
<text
xml:space="preserve"
style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;stroke-width:0.264583"
x="134.97845"
y="132.58472"
id="text3899"><tspan
sodipodi:role="line"
id="tspan3897"
style="stroke-width:0.264583"
x="134.97845"
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xml:space="preserve"
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sodipodi:role="line"
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x="169.92604"
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xml:space="preserve"
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sodipodi:role="line"
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style="fill:#000000;stroke-width:0.264583"
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xml:space="preserve"
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sodipodi:role="line"
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style="fill:#ff0000;stroke-width:0.264583"
x="259.75"
y="135.53111">${\Large\textbf{??!}}$~~~~~</tspan><tspan
sodipodi:role="line"
style="fill:#ff0000;stroke-width:0.264583"
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y="146.11446"
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After

Width:  |  Height:  |  Size: 25 KiB

View file

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sodipodi:role="line"
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sodipodi:role="line"
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cx="176.97627"
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id="text3707"><tspan
sodipodi:role="line"
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sodipodi:role="line"
id="tspan3748"
style="fill:#000000;stroke-width:0.264583"
x="23.457415"
y="24.042637">$\sqsupseteq \{a\} \to$ OK</tspan></text>
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xml:space="preserve"
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sodipodi:role="line"
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id="text3750-0"><tspan
sodipodi:role="line"
id="tspan3748-6"
style="fill:#999999;stroke-width:0.264583"
x="23.457415"
y="41.972523">$\not\sqsupseteq \{a\}$</tspan></text>
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xml:space="preserve"
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sodipodi:role="line"
id="tspan3705-4"
style="fill:#000000;stroke-width:0.264583"
x="6.9525447"
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<text
xml:space="preserve"
style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
x="59.340172"
y="118.94403"
id="text3707-5-3"><tspan
sodipodi:role="line"
id="tspan3705-4-6"
style="fill:#000000;stroke-width:0.264583"
x="59.340172"
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<text
xml:space="preserve"
style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#999999;stroke-width:0.264583"
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y="75.619804"
id="text3750-7"><tspan
sodipodi:role="line"
id="tspan3748-4"
style="fill:#999999;stroke-width:0.264583"
x="23.457415"
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xml:space="preserve"
style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
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id="text3750-3-4"><tspan
sodipodi:role="line"
id="tspan3748-2-3"
style="fill:#000000;stroke-width:0.264583"
x="23.457415"
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<text
xml:space="preserve"
style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#999999;stroke-width:0.264583"
x="23.457415"
y="93.54969"
id="text3750-0-0"><tspan
sodipodi:role="line"
id="tspan3748-6-7"
style="fill:#999999;stroke-width:0.264583"
x="23.457415"
y="93.54969">$\not\sqsupseteq \{b\}$</tspan></text>
<circle
style="fill:#800080;stroke:none;stroke-width:0.499999;stroke-dasharray:none;stop-color:#000000"
id="path3663-6"
cx="118.63729"
cy="67.630196"
r="2.7302806" />
<circle
style="fill:#800080;stroke:none;stroke-width:0.499999;stroke-dasharray:none;stop-color:#000000"
id="path3663-6-6-0"
cx="67.201363"
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<text
xml:space="preserve"
style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
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y="127.6125"
id="text3750-9"><tspan
sodipodi:role="line"
id="tspan3748-3"
style="fill:#000000;stroke-width:0.264583"
x="72.653946"
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<text
xml:space="preserve"
style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
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y="146.3129"
id="text4280-6"><tspan
sodipodi:role="line"
style="fill:#000000;stroke-width:0.264583"
x="62.764446"
y="146.3129"
id="tspan2630">return $\{a\}$</tspan></text>
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style="fill:#ff0000;stroke:none;stroke-width:0.499999;stroke-dasharray:none;stop-color:#000000"
id="path3663-3-0-7"
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<text
xml:space="preserve"
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sodipodi:role="line"
id="tspan3748-2-0"
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After

Width:  |  Height:  |  Size: 22 KiB

View file

@ -0,0 +1,654 @@
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id="tspan3748"
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sodipodi:role="line"
id="tspan3748-6"
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sodipodi:role="line"
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sodipodi:role="line"
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sodipodi:role="line"
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sodipodi:role="line"
id="tspan3748-2-3"
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sodipodi:role="line"
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sodipodi:role="line"
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sodipodi:role="line"
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sodipodi:role="line"
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After

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sodipodi:role="line"
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sodipodi:role="line"
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style="fill:#999999;stroke-width:0.264583"
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sodipodi:role="line"
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sodipodi:role="line"
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sodipodi:role="line"
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%\nonstopmode
\documentclass[aspectratio=169]{beamer}
\usepackage[utf8]{inputenc}
% \usepackage[frenchb]{babel}
\usepackage{amsmath}
\usepackage{mathtools}
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\usepackage{tabu}
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\usepackage{graphicx}
\usepackage[normalem]{ulem}
\AtBeginSection[]{
\begin{frame}
\vfill
\centering
\begin{beamercolorbox}[sep=8pt,center,shadow=true,rounded=true]{title}
\usebeamerfont{title}\insertsectionhead\par%
\end{beamercolorbox}
\vfill
\end{frame}
}
\title{Garage}
\subtitle{a lightweight and robust geo-distributed data storage system}
\author{Alex Auvolat, Deuxfleurs Association}
\date{Inria, 2023-01-18}
\begin{document}
\begin{frame}
\centering
\includegraphics[width=.3\linewidth]{../../sticker/Garage.pdf}
\vspace{1em}
{\large\bf Alex Auvolat, Deuxfleurs Association}
\vspace{1em}
\url{https://garagehq.deuxfleurs.fr/}
Matrix channel: \texttt{\#garage:deuxfleurs.fr}
\end{frame}
\begin{frame}
\frametitle{Who I am}
\begin{columns}[t]
\begin{column}{.2\textwidth}
\centering
\adjincludegraphics[width=.4\linewidth, valign=t]{assets/alex.jpg}
\end{column}
\begin{column}{.6\textwidth}
\textbf{Alex Auvolat}\\
PhD; co-founder of Deuxfleurs
\end{column}
\begin{column}{.2\textwidth}
~
\end{column}
\end{columns}
\vspace{2em}
\begin{columns}[t]
\begin{column}{.2\textwidth}
\centering
\adjincludegraphics[width=.5\linewidth, valign=t]{assets/deuxfleurs.pdf}
\end{column}
\begin{column}{.6\textwidth}
\textbf{Deuxfleurs}\\
A non-profit self-hosting collective,\\
member of the CHATONS network
\end{column}
\begin{column}{.2\textwidth}
\centering
\adjincludegraphics[width=.7\linewidth, valign=t]{assets/logo_chatons.png}
\end{column}
\end{columns}
\end{frame}
\begin{frame}
\frametitle{Our objective at Deuxfleurs}
\begin{center}
\textbf{Promote self-hosting and small-scale hosting\\
as an alternative to large cloud providers}
\end{center}
\vspace{2em}
\visible<2->{
Why is it hard?
}
\visible<3->{
\vspace{2em}
\begin{center}
\textbf{\underline{Resilience}}\\
{\footnotesize (we want good uptime/availability with low supervision)}
\end{center}
}
\end{frame}
\begin{frame}
\frametitle{How to make a \underline{stable} system}
Enterprise-grade systems typically employ:
\vspace{1em}
\begin{itemize}
\item RAID
\item Redundant power grid + UPS
\item Redundant Internet connections
\item Low-latency links
\item ...
\end{itemize}
\vspace{1em}
$\to$ it's costly and only worth it at DC scale
\end{frame}
\begin{frame}
\frametitle{How to make a \underline{resilient} system}
\only<1,4-5>{
Instead, we use:
\vspace{1em}
\begin{itemize}
\item \textcolor<2->{gray}{Commodity hardware (e.g. old desktop PCs)}
\vspace{.5em}
\item<4-> \textcolor<5->{gray}{Commodity Internet (e.g. FTTB, FTTH) and power grid}
\vspace{.5em}
\item<5-> \textcolor<6->{gray}{\textbf{Geographical redundancy} (multi-site replication)}
\end{itemize}
}
\only<2>{
\begin{center}
\includegraphics[width=.8\linewidth]{assets/atuin.jpg}
\end{center}
}
\only<3>{
\begin{center}
\includegraphics[width=.8\linewidth]{assets/neptune.jpg}
\end{center}
}
\only<6>{
\begin{center}
\includegraphics[width=.5\linewidth]{assets/inframap.jpg}
\end{center}
}
\end{frame}
\begin{frame}
\frametitle{How to make this happen}
\begin{center}
\only<1>{\includegraphics[width=.8\linewidth]{assets/slide1.png}}%
\only<2>{\includegraphics[width=.8\linewidth]{assets/slide2.png}}%
\only<3>{\includegraphics[width=.8\linewidth]{assets/slide3.png}}%
\end{center}
\end{frame}
\begin{frame}
\frametitle{Distributed file systems are slow}
File systems are complex, for example:
\vspace{1em}
\begin{itemize}
\item Concurrent modification by several processes
\vspace{1em}
\item Folder hierarchies
\vspace{1em}
\item Other requirements of the POSIX spec (e.g.~locks)
\end{itemize}
\vspace{1em}
Coordination in a distributed system is costly
\vspace{1em}
Costs explode with commodity hardware / Internet connections\\
{\small (we experienced this!)}
\end{frame}
\begin{frame}
\frametitle{A simpler solution: object storage}
Only two operations:
\vspace{1em}
\begin{itemize}
\item Put an object at a key
\vspace{1em}
\item Retrieve an object from its key
\end{itemize}
\vspace{1em}
{\footnotesize (and a few others)}
\vspace{1em}
Sufficient for many applications!
\end{frame}
\begin{frame}
\frametitle{A simpler solution: object storage}
\begin{center}
\includegraphics[height=6em]{../2020-12-02_wide-team/img/Amazon-S3.jpg}
\hspace{3em}
\includegraphics[height=5em]{assets/minio.png}
\hspace{3em}
\includegraphics[height=6em]{../../logo/garage_hires_crop.png}
\end{center}
\vspace{1em}
S3: a de-facto standard, many compatible applications
\vspace{1em}
MinIO is self-hostable but not suited for geo-distributed deployments
\vspace{1em}
\textbf{Garage is a self-hosted drop-in replacement for the Amazon S3 object store}
\end{frame}
\begin{frame}
\frametitle{The data model of object storage}
Object storage is basically a key-value store:
\vspace{1em}
\begin{center}
\begin{tabular}{|l|p{8cm}|}
\hline
\textbf{Key: file path + name} & \textbf{Value: file data + metadata} \\
\hline
\hline
\texttt{index.html} &
\texttt{Content-Type: text/html; charset=utf-8} \newline
\texttt{Content-Length: 24929} \newline
\texttt{<binary blob>} \\
\hline
\texttt{img/logo.svg} &
\texttt{Content-Type: text/svg+xml} \newline
\texttt{Content-Length: 13429} \newline
\texttt{<binary blob>} \\
\hline
\texttt{download/index.html} &
\texttt{Content-Type: text/html; charset=utf-8} \newline
\texttt{Content-Length: 26563} \newline
\texttt{<binary blob>} \\
\hline
\end{tabular}
\end{center}
\end{frame}
\begin{frame}
\frametitle{Garage's architecture}
\begin{center}
\includegraphics[width=.35\linewidth]{assets/garage.drawio.pdf}
\end{center}
\end{frame}
\begin{frame}
\frametitle{Two big problems}
\begin{enumerate}
\item \textbf{How to place data on different nodes?}\\
\vspace{1em}
\underline{Constraints:} heterogeneous hardware\\
\underline{Objective:} $n$ copies of everything, maximize usable capacity, maximize resilience\\
\vspace{1em}
$\to$ the Dynamo model + optimization algorithms
\vspace{2em}
\item<2-> \textbf{How to guarantee consistency?}\\
\vspace{1em}
\underline{Constraints:} slow network (geographical distance), node unavailability/crashes\\
\underline{Objective:} maximize availability, read-after-write guarantee\\
\vspace{1em}
$\to$ CRDTs, monotonicity, read and write quorums
\end{enumerate}
\end{frame}
\section{Problem 1: placing data}
\begin{frame}
\frametitle{Key-value stores, upgraded: the Dynamo model}
\textbf{Two keys:}
\begin{itemize}
\item Partition key: used to divide data into partitions {\small (a.k.a.~shards)}
\item Sort key: used to identify items inside a partition
\end{itemize}
\vspace{1em}
\begin{center}
\begin{tabular}{|l|l|p{3cm}|}
\hline
\textbf{Partition key: bucket} & \textbf{Sort key: filename} & \textbf{Value} \\
\hline
\hline
\texttt{website} & \texttt{index.html} & (file data) \\
\hline
\texttt{website} & \texttt{img/logo.svg} & (file data) \\
\hline
\texttt{website} & \texttt{download/index.html} & (file data) \\
\hline
\hline
\texttt{backup} & \texttt{borg/index.2822} & (file data) \\
\hline
\texttt{backup} & \texttt{borg/data/2/2329} & (file data) \\
\hline
\texttt{backup} & \texttt{borg/data/2/2680} & (file data) \\
\hline
\hline
\texttt{private} & \texttt{qq3a2nbe1qjq0ebbvo6ocsp6co} & (file data) \\
\hline
\end{tabular}
\end{center}
\end{frame}
\begin{frame}
\frametitle{Key-value stores, upgraded: the Dynamo model}
\begin{itemize}
\item Data with different partition keys is stored independently,\\
on a different set of nodes\\
\vspace{.5em}
$\to$ no easy way to list all partition keys\\
$\to$ no cross-shard transactions\\
\vspace{2em}
\item Placing data: hash the partition key, select nodes accordingly\\
\vspace{.5em}
$\to$ distributed hash table (DHT)
\vspace{2em}
\item For a given value of the partition key, items can be listed using their sort keys
\end{itemize}
\end{frame}
\begin{frame}
\frametitle{How to spread files over different cluster nodes?}
\textbf{Consistent hashing (Dynamo):}
\vspace{1em}
\begin{center}
\only<1>{\includegraphics[width=.40\columnwidth]{assets/consistent_hashing_1.pdf}}%
\only<2>{\includegraphics[width=.40\columnwidth]{assets/consistent_hashing_2.pdf}}%
\only<3>{\includegraphics[width=.40\columnwidth]{assets/consistent_hashing_3.pdf}}%
\only<4>{\includegraphics[width=.40\columnwidth]{assets/consistent_hashing_4.pdf}}%
\end{center}
\end{frame}
\begin{frame}
\frametitle{Constraint: location-awareness}
\begin{center}
\includegraphics[width=\linewidth]{assets/location-aware.png}
\end{center}
\vspace{2em}
Garage replicates data on different zones when possible
\end{frame}
\begin{frame}
\frametitle{Constraint: location-awareness}
\begin{center}
\includegraphics[width=.8\linewidth]{assets/map.png}
\end{center}
\end{frame}
\begin{frame}
\frametitle{Issues with consistent hashing}
\begin{itemize}
\item Consistent hashing doesn't dispatch data based on geographical location of nodes
\vspace{1em}
\item<2-> Geographically aware adaptation, try 1:\\
data quantities not well balanced between nodes
\vspace{1em}
\item<3-> Geographically aware adaptation, try 2:\\
too many reshuffles when adding/removing nodes
\end{itemize}
\end{frame}
\begin{frame}
\frametitle{How to spread files over different cluster nodes?}
\textbf{Garage's method: build an index table}
\vspace{1em}
Realization: we can actually precompute an optimal solution
\vspace{1em}
\visible<2->{
\begin{center}
\begin{tabular}{|l|l|l|l|}
\hline
\textbf{Partition} & \textbf{Node 1} & \textbf{Node 2} & \textbf{Node 3} \\
\hline
\hline
Partition 0 & Io (jupiter) & Drosera (atuin) & Courgette (neptune) \\
\hline
Partition 1 & Datura (atuin) & Courgette (neptune) & Io (jupiter) \\
\hline
Partition 2 & Io(jupiter) & Celeri (neptune) & Drosera (atuin) \\
\hline
\hspace{1em}$\vdots$ & \hspace{1em}$\vdots$ & \hspace{1em}$\vdots$ & \hspace{1em}$\vdots$ \\
\hline
Partition 255 & Concombre (neptune) & Io (jupiter) & Drosera (atuin) \\
\hline
\end{tabular}
\end{center}
}
\vspace{1em}
\visible<3->{
The index table is built centrally using an optimal algorithm,\\
then propagated to all nodes
}
\end{frame}
\begin{frame}
\frametitle{The relationship between \emph{partition} and \emph{partition key}}
\begin{center}
\begin{tabular}{|l|l|l|l|}
\hline
\textbf{Partition key} & \textbf{Partition} & \textbf{Sort key} & \textbf{Value} \\
\hline
\hline
\texttt{website} & Partition 12 & \texttt{index.html} & (file data) \\
\hline
\texttt{website} & Partition 12 & \texttt{img/logo.svg} & (file data) \\
\hline
\texttt{website} & Partition 12 &\texttt{download/index.html} & (file data) \\
\hline
\hline
\texttt{backup} & Partition 42 & \texttt{borg/index.2822} & (file data) \\
\hline
\texttt{backup} & Partition 42 & \texttt{borg/data/2/2329} & (file data) \\
\hline
\texttt{backup} & Partition 42 & \texttt{borg/data/2/2680} & (file data) \\
\hline
\hline
\texttt{private} & Partition 42 & \texttt{qq3a2nbe1qjq0ebbvo6ocsp6co} & (file data) \\
\hline
\end{tabular}
\end{center}
\vspace{1em}
\textbf{To read or write an item:} hash partition key
\\ \hspace{5cm} $\to$ determine partition number (first 8 bits)
\\ \hspace{5cm} $\to$ find associated nodes
\end{frame}
\begin{frame}
\frametitle{Garage's internal data structures}
\centering
\includegraphics[width=.75\columnwidth]{assets/garage_tables.pdf}
\end{frame}
\begin{frame}
\frametitle{Storing and retrieving files}
\begin{center}
\only<1>{\includegraphics[width=.45\linewidth]{assets/garage2a.drawio.pdf}}%
\only<2>{\includegraphics[width=.45\linewidth]{assets/garage2b.drawio.pdf}}%
\end{center}
\end{frame}
\section{Problem 2: ensuring consistency}
\begin{frame}
\frametitle{Consensus vs weak consistency}
\hspace{1em}
\begin{minipage}{7cm}
\textbf{Consensus-based systems:}
\vspace{1em}
\begin{itemize}
\item \textbf{Leader-based:} a leader is elected to coordinate
all reads and writes
\vspace{1em}
\item \textbf{Linearizability} of all operations\\
(strongest consistency guarantee)
\vspace{1em}
\item Any sequential specification can be implemented as a \textbf{replicated state machine}
\vspace{1em}
\item \textbf{Costly}, the leader is a bottleneck;
leader elections on failure take time
\end{itemize}
\end{minipage}
\hfill
\begin{minipage}{7cm} \visible<2->{
\textbf{Weakly consistent systems:}
\vspace{1em}
\begin{itemize}
\item \textbf{Nodes are equivalent}, any node
can originate a read or write operation
\vspace{1em}
\item \textbf{Read-after-write consistency} with quorums,
eventual consistency without
\vspace{1em}
\item \textbf{Operations have to commute}, i.e.~we
can only implement CRDTs
\vspace{1em}
\item \textbf{Fast}, no single bottleneck;\\
works the same with offline nodes
\end{itemize}
} \end{minipage}
\hspace{1em}
\end{frame}
\begin{frame}
\frametitle{Consensus vs weak consistency}
\begin{center}
\textbf{From a theoretical point of view:}\\
\end{center}
\vspace{2em}
\hspace{1em}
\begin{minipage}{6.5cm}
\underline{Consensus-based systems:}
\vspace{1em}
Require \textbf{additional assumptions} such as a fault detector or a strong RNG\\
(FLP impossibility theorem)
\end{minipage}
\hfill
\begin{minipage}{6.5cm}
\underline{Weakly consistent systems:}
\vspace{1em}
Can be implemented in \textbf{any\\asynchronous message passing\\distributed system} with node crashes
\end{minipage}
\hspace{1em}
\vspace{3em}
\begin{center}
They represent \textbf{different classes of computational capability}\\
\end{center}
\end{frame}
\begin{frame}
\frametitle{Consensus vs weak consistency}
\begin{center}
\textbf{The same objects cannot be implemented in both models.}
\end{center}
\vspace{2em}
\hspace{1em}
\begin{minipage}{6.5cm}
\underline{Consensus-based systems:}
\vspace{1em}
\textbf{Any sequential specification}\\~
\vspace{1em}
\textbf{Easier to program for}: just write your program as if it were sequential on a single machine
\end{minipage}
\hfill
\begin{minipage}{6.5cm}
\underline{Weakly consistent systems:}
\vspace{1em}
\textbf{Only CRDTs}\\(conflict-free replicated data types)
\vspace{1em}
Part of the complexity is \textbf{reported to the consumer of the API}\\~
\end{minipage}
\hspace{1em}
\end{frame}
\begin{frame}
\frametitle{Understanding the power of consensus}
\textbf{Consensus:} an API with a single operation, $propose(x)$
\begin{enumerate}
\item nodes all call $propose(x)$ with their proposed value;
\item nodes all receive the same value as a return value, which is one of the proposed values
\end{enumerate}
\vspace{1em}
\visible<2->{
\textbf{Equivalent to} a distributed algorithm that gives a total order on all requests
}
\vspace{1em}
\visible<3->{
\textbf{Implemented by} this simple replicated state machine:
\vspace{.5em}
\begin{figure}
\centering
\def\svgwidth{.5\textwidth}
\large
\import{assets/}{consensus.pdf_tex}
\end{figure}
\vspace{1em}
}
\end{frame}
\begin{frame}
\frametitle{Can my object be implemented without consensus?}
\underline{Given the specification of an API:}
\vspace{2em}
\begin{itemize}
\item \textbf{Using this API, we can implement the consensus object} (the $propose$ function)\\
$\to$ the API is equivalent to consensus/total ordering of messages\\
$\to$ the API cannot be implemented in a weakly consistent system
\vspace{2em}
\item<2-> \textbf{This API can be implemented using only weak primitives}\\
(e.g. in the asynchronous message passing model with no further assumption)\\
$\to$ the API is strictly weaker than consensus\\
$\to$ we can implement it in Garage!
\end{itemize}
\end{frame}
\begin{frame}
\frametitle{Why avoid consensus?}
Consensus can be implemented reasonably well in practice, so why avoid it?
\vspace{2em}
\begin{itemize}
\item \textbf{Software complexity:} RAFT and PAXOS are complex beasts;\\
harder to prove, harder to reason about
\vspace{1.5em}
\item \textbf{Performance issues:}
\vspace{1em}
\begin{itemize}
\item Theoretical requirements (RNG, failure detector) translate into \textbf{practical costs}
\vspace{1em}
\item The leader is a \textbf{bottleneck} for all requests;\\
even in leaderless approaches, \textbf{all nodes must process all operations in order}
\vspace{1em}
\item Particularly \textbf{sensitive to higher latency} between nodes
\end{itemize}
\end{itemize}
\end{frame}
\begin{frame}
\frametitle{Performance gains in practice}
\begin{center}
\includegraphics[width=.8\linewidth]{assets/endpoint-latency-dc.png}
\end{center}
\end{frame}
\begin{frame}
\frametitle{What can we implement without consensus?}
\begin{itemize}
\item Any \textbf{conflict-free replicated data type} (CRDT)
\vspace{1em}
\item<2-> Non-transactional key-value stores such as S3 are equivalent to a simple CRDT:\\
a map of \textbf{last-writer-wins registers} (each key is its own CRDT)
\vspace{1em}
\item<3-> \textbf{Read-after-write consistency} can be implemented
using quorums on read and write operations
\vspace{1em}
\item<4-> \textbf{Monotonicity of reads} can be implemented with repair-on-read\\
(makes reads more costly, not implemented in Garage)
\end{itemize}
\end{frame}
\begin{frame}
\frametitle{CRDTs and quorums: read-after-write consistency}
\begin{figure}
\centering
\def\svgwidth{.8\textwidth}
\only<1>{\import{assets/}{lattice1.pdf_tex}}%
\only<2>{\import{assets/}{lattice2.pdf_tex}}%
\only<3>{\import{assets/}{lattice3.pdf_tex}}%
\only<4>{\import{assets/}{lattice4.pdf_tex}}%
\only<5>{\import{assets/}{lattice5.pdf_tex}}%
\only<6>{\import{assets/}{lattice6.pdf_tex}}%
\only<7>{\import{assets/}{lattice7.pdf_tex}}%
\only<8>{\import{assets/}{lattice8.pdf_tex}}%
\end{figure}
\end{frame}
\begin{frame}
\frametitle{CRDTs and quorums: read-after-write consistency}
\textbf{Property:} If node $A$ did an operation $write(x)$ and received an OK response,\\
\hspace{2cm} and node $B$ starts an operation $read()$ after $A$ received OK,\\
\hspace{2cm} then $B$ will read a value $x' \sqsupseteq x$.
\vspace{1em}
\hspace{1em}
\begin{minipage}{6.8cm}
\textbf{Algorithm $write(x)$:}
\begin{enumerate}
\item Broadcast $write(x)$ to all nodes
\item Wait for $k > n/2$ nodes to reply OK
\item Return OK
\end{enumerate}
\end{minipage}
\hfill
\begin{minipage}{6.8cm}
\vspace{1em}
\textbf{Algorithm $read()$:}
\begin{enumerate}
\item Broadcast $read()$ to all nodes
\item Wait for $k > n/2$ nodes to reply\\
with values $x_1, \dots, x_k$
\item Return $x_1 \sqcup \dots \sqcup x_k$
\end{enumerate}
\end{minipage}
\hspace{1em}
\vspace{2em}
\textbf{Why does it work?} There is at least one node at the intersection between the two sets of nodes that replied to each request, that ``saw'' $x$ before the $read()$ started ($x_i \sqsupseteq x$).
\end{frame}
\begin{frame}
\frametitle{CRDTs and quorums: monotonic-reads consistency}
\begin{figure}
\centering
\def\svgwidth{.8\textwidth}
\only<1>{\import{assets/}{latticeB_1.pdf_tex}}%
\only<2>{\import{assets/}{latticeB_2.pdf_tex}}%
\only<3>{\import{assets/}{latticeB_3.pdf_tex}}%
\only<4>{\import{assets/}{latticeB_4.pdf_tex}}%
\only<5>{\import{assets/}{latticeB_5.pdf_tex}}%
\only<6>{\import{assets/}{latticeB_6.pdf_tex}}%
\only<7>{\import{assets/}{latticeB_7.pdf_tex}}%
\only<8>{\import{assets/}{latticeB_8.pdf_tex}}%
\only<9>{\import{assets/}{latticeB_9.pdf_tex}}%
\only<10>{\import{assets/}{latticeB_10.pdf_tex}}%
\end{figure}
\end{frame}
\begin{frame}
\frametitle{CRDTs and quorums: monotonic-reads consistency}
\textbf{Property:} If node $A$ did an operation $read()$ and received $x$ as a response,\\
\hspace{2cm} and node $B$ starts an operation $read()$ after $A$ received $x$,\\
\hspace{2cm} then $B$ will read a value $x' \sqsupseteq x$.
\vspace{1em}
\textbf{Algorithm $monotonic\_read()$:} {\small (a.k.a. repair-on-read)}
\begin{enumerate}
\item Broadcast $read()$ to all nodes
\item Wait for $k > n/2$ nodes to reply with values $x_1, \dots, x_k$
\item If $x_i \ne x_j$ for some nodes $i$ and $j$,\\
\hspace{1cm}then call $write(x_1 \sqcup \dots \sqcup x_k)$ and wait for OK from $k' > n/2$ nodes
\item Return $x_1 \sqcup \dots \sqcup x_k$
\end{enumerate}
\vspace{1em}
This makes reads slower in some cases, and is \textbf{not implemented in Garage}.
\end{frame}
\begin{frame}
\frametitle{A hard problem: layout changes}
\begin{itemize}
\item We rely on quorums $k > n/2$ within each partition:\\
$$n=3,~~~~~~~k\ge 2$$
\item<2-> When rebalancing, the set of nodes responsible for a partition can change:\\
$$\{n_A, n_B, n_C\} \to \{n_A, n_D, n_E\}$$
\vspace{.01em}
\item<3-> During the rebalancing, $D$ and $E$ don't yet have the data,\\
~~~~~~~~~~~~~~~~~~~and $B$ and $C$ want to get rid of the data to free up space\\
\vspace{.2em}
$\to$ quorums only within the new set of nodes don't work\\
$\to$ how to coordinate? \textbf{currently, we don't...}
\end{itemize}
\end{frame}
\section{Going further than the S3 API}
\begin{frame}
\frametitle{Using Garage for everything}
\begin{center}
\only<1>{\includegraphics[width=.8\linewidth]{assets/slideB1.png}}%
\only<2>{\includegraphics[width=.8\linewidth]{assets/slideB2.png}}%
\only<3>{\includegraphics[width=.8\linewidth]{assets/slideB3.png}}%
\end{center}
\end{frame}
\begin{frame}
\frametitle{K2V Design}
\begin{itemize}
\item A new, custom, minimal API\\
\vspace{.5em}
\begin{itemize}
\item Single-item operations
\item Operations on ranges and batches of items
\item Polling operations to help implement a PubSub pattern
\end{itemize}
\vspace{1em}
\item<2-> Exposes the partitoning mechanism of Garage\\
K2V = partition key / sort key / value (like Dynamo)
\vspace{1em}
\item<3-> Weakly consistent, CRDT-friendly\\
$\to$ no support for transactions (not ACID)
\vspace{1em}
\item<4-> Cryptography-friendly: values are binary blobs
\end{itemize}
\end{frame}
\begin{frame}
\frametitle{Handling concurrent values}
\textbf{How to handle concurrency?} Example:
\vspace{1em}
\begin{enumerate}
\item Client $A$ reads the initial value of a key, $x_0$
\vspace{1em}
\item<2-> Client $B$ also reads the initial value $x_0$ of that key
\vspace{1em}
\item<3-> Client $A$ modifies $x_0$, and writes a new value $x_1$
\vspace{1em}
\item<4-> Client $B$ also modifies $x_0$, and writes a new value $x'_1$,\\
without having a chance to first read $x_1$\\
\vspace{1em}
$\to$ what should the final state be?
\end{enumerate}
\end{frame}
\begin{frame}
\frametitle{Handling concurrent values}
\begin{itemize}
\item If we keep only $x_1$ or $x'_1$, we risk \textbf{loosing application data}
\vspace{1.5em}
\item<2-> Values are opaque binary blobs, \textbf{K2V cannot resolve conflicts} by itself\\
(e.g. by implementing a CRDT)
\vspace{1.5em}
\item<3-> Solution: \textbf{we keep both!}\\
$\to$ the value of the key is now $\{x_1, x'_1\}$\\
$\to$ the client application can decide how to resolve conflicts on the next read
\end{itemize}
\end{frame}
\begin{frame}
\frametitle{Keeping track of causality}
How does K2V know that $x_1$ and $x'_1$ are concurrent?
\vspace{1em}
\begin{itemize}
\item $read()$ returns \textbf{a set of values} and an associated \textbf{causality token}\\
\vspace{1.5em}
\item<2-> When calling $write()$, the client sends \textbf{the causality token from its last read}
\vspace{1.5em}
\item<3-> The causality token represents the set of values \textbf{already seen by the client}\\
$\to$ those values are the \textbf{causal past} of the write operation\\
$\to$ K2V can keep concurrent values and overwrite all ones in the causal past
\vspace{1.5em}
\item<4-> Internally, the causality token is \textbf{a vector clock}
\end{itemize}
\end{frame}
\begin{frame}
\frametitle{Application: an e-mail storage server}
\begin{center}
\only<1>{\includegraphics[width=.9\linewidth]{assets/aerogramme.png}}%
\end{center}
\end{frame}
\begin{frame}
\frametitle{Aerogramme data model}
\begin{center}
\only<1>{\includegraphics[width=.4\linewidth]{assets/aerogramme_datatype.drawio.pdf}}%
\only<2->{\includegraphics[width=.9\linewidth]{assets/aerogramme_keys.drawio.pdf}\vspace{1em}}%
\end{center}
\visible<3->{Aerogramme encrypts all stored values for privacy\\
(Garage server administrators can't read your mail)}
\end{frame}
\begin{frame}
\frametitle{Different deployment scenarios}
\begin{center}
\only<1>{\includegraphics[width=.9\linewidth]{assets/aerogramme_components1.drawio.pdf}}%
\only<2>{\includegraphics[width=.9\linewidth]{assets/aerogramme_components2.drawio.pdf}}%
\end{center}
\end{frame}
\begin{frame}
\frametitle{A new model for building resilient software}
How to build an application using only Garage as a data store:
\vspace{1em}
\begin{enumerate}
\item Design a data model suited to K2V\\
{\footnotesize (see Cassandra docs on porting SQL data models to Cassandra)}
\vspace{1em}
\begin{itemize}
\item Use CRDTs or other eventually consistent data types (see e.g. Bayou)
\vspace{1em}
\item Store opaque binary blobs to provide End-to-End Encryption\\
\end{itemize}
\vspace{1em}
\item<2-> Store big blobs (files) using the S3 API
\vspace{1em}
\item<3-> Let Garage manage sharding, replication, failover, etc.
\end{enumerate}
\end{frame}
\section{Conclusion}
\begin{frame}
\frametitle{Perspectives}
\begin{itemize}
\item Fix the consistency issue when rebalancing
\vspace{1em}
\item Write about Garage's architecture and properties,\\
and about our proposed architecture for (E2EE) apps over K2V+S3
\vspace{1em}
\item Continue developing Garage; finish Aerogramme; build new applications...
\vspace{1em}
\item Anything else?
\end{itemize}
\end{frame}
\begin{frame}
\frametitle{Where to find us}
\begin{center}
\includegraphics[width=.25\linewidth]{../../logo/garage_hires.png}\\
\vspace{-1em}
\url{https://garagehq.deuxfleurs.fr/}\\
\url{mailto:garagehq@deuxfleurs.fr}\\
\texttt{\#garage:deuxfleurs.fr} on Matrix
\vspace{1.5em}
\includegraphics[width=.06\linewidth]{assets/rust_logo.png}
\includegraphics[width=.13\linewidth]{assets/AGPLv3_Logo.png}
\end{center}
\end{frame}
\end{document}
%% vim: set ts=4 sw=4 tw=0 noet spelllang=en :

12
doc/talks/shell.nix Normal file
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@ -0,0 +1,12 @@
{ pkgs ? import <nixpkgs> { } }:
let
latex = (pkgs.texlive.combine {
inherit (pkgs.texlive)
scheme-basic
beamer amsmath mathtools breqn
environ
multirow graphics import adjustbox tabu vwcol stmaryrd ulem ragged2e
dvisvgm dvipng wrapfig hyperref capt-of;
});
in pkgs.mkShell { nativeBuildInputs = [ pkgs.gnumake latex ]; }