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Quentin 2020-12-06 15:21:09 +01:00
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@ -0,0 +1,247 @@
%\nonstopmode
\documentclass[aspectratio=169]{beamer}
\usepackage[utf8]{inputenc}
% \usepackage[frenchb]{babel}
\usepackage{amsmath}
\usepackage{mathtools}
\usepackage{breqn}
\usepackage{multirow}
\usetheme{Luebeck}
\usepackage{graphicx}
%\useoutertheme[footline=authortitle,subsection=false]{miniframes}
\beamertemplatenavigationsymbolsempty
\setbeamertemplate{footline}
{%
\leavevmode%
\hbox{\begin{beamercolorbox}[wd=.15\paperwidth,ht=2.5ex,dp=1.125ex,leftskip=.3cm,rightskip=.3cm plus1fill]{author in head/foot}%
\usebeamerfont{author in head/foot} \insertframenumber{} / \inserttotalframenumber
\end{beamercolorbox}%
\begin{beamercolorbox}[wd=.2\paperwidth,ht=2.5ex,dp=1.125ex,leftskip=.3cm plus1fill,rightskip=.3cm]{author in head/foot}%
\usebeamerfont{author in head/foot}\insertshortauthor
\end{beamercolorbox}%
\begin{beamercolorbox}[wd=.65\paperwidth,ht=2.5ex,dp=1.125ex,leftskip=.3cm,rightskip=.3cm plus1fil]{title in head/foot}%
\usebeamerfont{title in head/foot}\insertshorttitle~--~\insertshortdate
\end{beamercolorbox}}%
\vskip0pt%
}
\usepackage{tabu}
\usepackage{multicol}
\usepackage{vwcol}
\usepackage{stmaryrd}
\usepackage{graphicx}
\usepackage[normalem]{ulem}
\title[Garage : jouer dans la cour des grands quand on est un hébergeur associatif]{Garage : jouer dans la cour des grands \\quand on est un hébergeur associatif}
\subtitle{(ou pourquoi on a décidé de réinventer la roue)}
\author[Q. Dufour \& A. Auvolat]{Quentin Dufour \& Alex Auvolat}
\date[02/12/2020]{Mercredi 2 décembre 2020}
\begin{document}
\begin{frame}
\titlepage
\end{frame}
\begin{frame}
\frametitle{La question qui tue}
\begin{center}
\includegraphics[scale=3]{img/sync.png} \\
\Huge Pourquoi vous n'hébergez pas vos fichiers chez vous ? \\
\end{center}
\end{frame}
\begin{frame}[t]
\frametitle{La cour des grands}
\begin{columns}[t]
\begin{column}{0.5\textwidth}
{\huge Le modèle du cloud...}
\begin{center}
\includegraphics[scale=0.08]{img/cloud.png}
\end{center}
+ \underline{intégrité} : plus de perte de données
+ \underline{disponibilité} : tout le temps accessible
+ \underline{service} : rien à gérer
\vspace{0.15cm}
\textbf{changement des comportements}
\end{column}
\pause
\begin{column}{0.5\textwidth}
{\huge ...et son prix}
\begin{center}
\includegraphics[scale=0.07]{img/dc.jpg}
\end{center}
- matériel couteux et polluant
- logiciels secrets
- gestion opaque
\vspace{0.2cm}
\textbf{prisonnier de l'écosystème}
\end{column}
\end{columns}
\end{frame}
\begin{frame}[t]
\frametitle{Garage l'imposteur}
\begin{columns}[t]
\begin{column}{0.5\textwidth}
{\huge Ressemble à du cloud...}
\begin{center}
\includegraphics[scale=0.5]{img/shh.jpg}
\end{center}
+ \underline{compatible} avec les apps existantes
+ \underline{fonctionne} avec le mobile
+ \underline{s'adapte} aux habitudes prises
\end{column}
\pause
\begin{column}{0.5\textwidth}
{\huge ...fait du P2P}
\begin{center}
\includegraphics[scale=1]{img/death.jpg}
\end{center}
\vspace{0.4cm}
+ \underline{contrôle} de l'infrastructure
+ \underline{transparent} code libre
+ \underline{sobre} fonctionne avec de vieilles machines à la maison
\end{column}
\end{columns}
\end{frame}
\graphicspath{{img/}}
\begin{frame}
\frametitle{Mais donc, c'est quoi Garage ?}
\begin{columns}[t]
\begin{column}{0.5\textwidth}
\centering
\textbf{Un système de stockage distribué}
\vspace{1em}
\includegraphics[width=.7\columnwidth]{img/garage_distributed.pdf}
\end{column}
\pause
\begin{column}{0.5\textwidth}
\centering
\textbf{qui implémente l'API S3}
\vspace{2em}
\includegraphics[width=.7\columnwidth]{img/Amazon-S3.jpg}
\end{column}
\end{columns}
\end{frame}
\begin{frame}
\frametitle{Consistent Hashing (DynamoDB)}
\textbf{Comment répartir les fichiers sur les différentes machines ?}
\vspace{1em}
\centering
\only<1>{\includegraphics[width=.55\columnwidth]{img/consistent_hashing_1.pdf}}%
\only<2>{\includegraphics[width=.55\columnwidth]{img/consistent_hashing_2.pdf}}%
\only<3>{\includegraphics[width=.55\columnwidth]{img/consistent_hashing_3.pdf}}%
\only<4>{\includegraphics[width=.55\columnwidth]{img/consistent_hashing_4.pdf}}%
\end{frame}
\begin{frame}
\frametitle{Garage Internals : 3 niveaux de consistent hashing}
\centering
\includegraphics[width=.85\columnwidth]{img/garage_tables.pdf}
\end{frame}
\begin{frame}
\frametitle{Modèles de cohérence}
Garage utilise un modèle de cohérence relativement faible :
\vspace{1em}
\begin{itemize}
\item Objets répliqués 3 fois, quorum de 2 pour les lectures et les écritures\\
$\to$ cohérence \textbf{``read your writes''}
\vspace{1em}
\item<2-> Types de donnée CRDT + mécanisme d'anti-entropie\\
$\to$ cohérence \textbf{à terme} (eventual consistency)
\vspace{1em}
\item<3-> Cela s'applique pour chaque fichier individuellement :\\
pas de linéarisabilté ou de cohérence causale entre les opérations\\
sur des fichiers différents
\vspace{1em}
\item<4-> \textbf{Avantage :} convient bien à un déploiement géodistribué (multi-datacenter)
\end{itemize}
\end{frame}
\begin{frame}
\frametitle{Rust : retour d'expérience}
\begin{columns}
\begin{column}{0.55\textwidth}
Garage est entièrement écrit en Rust !
\vspace{2em}
\textbf{Points forts :}
\vspace{.5em}
\begin{itemize}
\item Langage compilé, très rapide
\vspace{.5em}
\item Typage fort, beaucoup de sécurités
\vspace{.5em}
\item Le meilleur de plusieurs paradigmes:
fonctionnel, orienté objet, impératif
\vspace{.5em}
\item Un écosytème de librairies très complet:
serialisation, async/await, http, ...
\end{itemize}
\end{column}
\begin{column}{0.45\textwidth}
\begin{centering}
\hspace{2em}\includegraphics[width=0.55\columnwidth]{img/rustacean-flat-happy.png}
\end{centering}
\vspace{2em}
\textbf{Points faibles :}
\vspace{.5em}
\begin{itemize}
\item Les temps de compilation...
\vspace{.5em}
\item Compliqué à apprendre
\end{itemize}
\vspace{2em}
\end{column}
\end{columns}
\end{frame}
\end{document}
%% vim: set ts=4 sw=4 tw=0 noet spelllang=fr :

51
src/api/s3_get.rs
View file

@ -24,7 +24,6 @@ fn object_headers(
"Content-Type",
version_meta.headers.content_type.to_string(),
)
.header("Content-Length", format!("{}", version_meta.size))
.header("ETag", version_meta.etag.to_string())
.header("Last-Modified", date_str)
.header("Accept-Ranges", format!("bytes"));
@ -63,6 +62,7 @@ pub async fn handle_head(
let body: Body = Body::from(vec![]);
let response = object_headers(&version, version_meta)
.header("Content-Length", format!("{}", version_meta.size))
.status(StatusCode::OK)
.body(body)
.unwrap();
@ -123,7 +123,9 @@ pub async fn handle_get(
.await;
}
let resp_builder = object_headers(&last_v, last_v_meta).status(StatusCode::OK);
let resp_builder = object_headers(&last_v, last_v_meta)
.header("Content-Length", format!("{}", last_v_meta.size))
.status(StatusCode::OK);
match &last_v_data {
ObjectVersionData::DeleteMarker => unreachable!(),
@ -161,7 +163,7 @@ pub async fn handle_get(
}
})
.buffered(2);
//let body: Body = Box::new(StreamBody::new(Box::pin(body_stream)));
let body = hyper::body::Body::wrap_stream(body_stream);
Ok(resp_builder.body(body)?)
}
@ -181,9 +183,10 @@ pub async fn handle_get_range(
}
let resp_builder = object_headers(version, version_meta)
.header("Content-Length", format!("{}", end - begin))
.header(
"Content-Range",
format!("bytes {}-{}/{}", begin, end, version_meta.size),
format!("bytes {}-{}/{}", begin, end - 1, version_meta.size),
)
.status(StatusCode::PARTIAL_CONTENT);
@ -206,35 +209,49 @@ pub async fn handle_get_range(
None => return Err(Error::NotFound),
};
let blocks = version
.blocks()
.iter()
.cloned()
.filter(|block| block.offset + block.size > begin && block.offset < end)
.collect::<Vec<_>>();
// We will store here the list of blocks that have an intersection with the requested
// range, as well as their "true offset", which is their actual offset in the complete
// file (whereas block.offset designates the offset of the block WITHIN THE PART
// block.part_number, which is not the same in the case of a multipart upload)
let mut blocks = Vec::with_capacity(std::cmp::min(
version.blocks().len(),
4 + ((end - begin) / std::cmp::max(version.blocks()[0].size as u64, 1024)) as usize,
));
let mut true_offset = 0;
for b in version.blocks().iter() {
if true_offset >= end {
break;
}
// Keep only blocks that have an intersection with the requested range
if true_offset < end && true_offset + b.size > begin {
blocks.push((b.clone(), true_offset));
}
true_offset += b.size;
}
let body_stream = futures::stream::iter(blocks)
.map(move |block| {
.map(move |(block, true_offset)| {
let garage = garage.clone();
async move {
let data = garage.block_manager.rpc_get_block(&block.hash).await?;
let start_in_block = if block.offset > begin {
let data = Bytes::from(data);
let start_in_block = if true_offset > begin {
0
} else {
begin - block.offset
begin - true_offset
};
let end_in_block = if block.offset + block.size < end {
let end_in_block = if true_offset + block.size < end {
block.size
} else {
end - block.offset
end - true_offset
};
Result::<Bytes, Error>::Ok(Bytes::from(
data[start_in_block as usize..end_in_block as usize].to_vec(),
data.slice(start_in_block as usize..end_in_block as usize),
))
}
})
.buffered(2);
//let body: Body = Box::new(StreamBody::new(Box::pin(body_stream)));
let body = hyper::body::Body::wrap_stream(body_stream);
Ok(resp_builder.body(body)?)
}