Support website publishing #7
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doc/20201202_talk/.gitignore
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talk.pdf: talk.tex img/garage_distributed.pdf img/consistent_hashing_1.pdf img/consistent_hashing_2.pdf img/consistent_hashing_3.pdf img/consistent_hashing_4.pdf img/garage_tables.pdf
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pdflatex talk.tex
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img/%.pdf: img/%.svg
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@ -0,0 +1,247 @@
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||||||
|
%\nonstopmode
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|
\documentclass[aspectratio=169]{beamer}
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|
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|
% \usepackage[frenchb]{babel}
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\usepackage{amsmath}
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\usepackage{mathtools}
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\usepackage{breqn}
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\usepackage{multirow}
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|
\usetheme{Luebeck}
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|
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%\useoutertheme[footline=authortitle,subsection=false]{miniframes}
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\usebeamerfont{author in head/foot}\insertshortauthor
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|
\begin{beamercolorbox}[wd=.65\paperwidth,ht=2.5ex,dp=1.125ex,leftskip=.3cm,rightskip=.3cm plus1fil]{title in head/foot}%
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\usebeamerfont{title in head/foot}\insertshorttitle~--~\insertshortdate
|
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}
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|
\usepackage{tabu}
|
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|
\usepackage{multicol}
|
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|
\usepackage{vwcol}
|
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|
\usepackage{stmaryrd}
|
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|
||||||
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||||||
|
\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 :
|
||||||
|
|
@ -24,7 +24,6 @@ fn object_headers(
|
||||||
"Content-Type",
|
"Content-Type",
|
||||||
version_meta.headers.content_type.to_string(),
|
version_meta.headers.content_type.to_string(),
|
||||||
)
|
)
|
||||||
.header("Content-Length", format!("{}", version_meta.size))
|
|
||||||
.header("ETag", version_meta.etag.to_string())
|
.header("ETag", version_meta.etag.to_string())
|
||||||
.header("Last-Modified", date_str)
|
.header("Last-Modified", date_str)
|
||||||
.header("Accept-Ranges", format!("bytes"));
|
.header("Accept-Ranges", format!("bytes"));
|
||||||
|
|
@ -63,6 +62,7 @@ pub async fn handle_head(
|
||||||
|
|
||||||
let body: Body = Body::from(vec![]);
|
let body: Body = Body::from(vec![]);
|
||||||
let response = object_headers(&version, version_meta)
|
let response = object_headers(&version, version_meta)
|
||||||
|
.header("Content-Length", format!("{}", version_meta.size))
|
||||||
.status(StatusCode::OK)
|
.status(StatusCode::OK)
|
||||||
.body(body)
|
.body(body)
|
||||||
.unwrap();
|
.unwrap();
|
||||||
|
|
@ -123,7 +123,9 @@ pub async fn handle_get(
|
||||||
.await;
|
.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 {
|
match &last_v_data {
|
||||||
ObjectVersionData::DeleteMarker => unreachable!(),
|
ObjectVersionData::DeleteMarker => unreachable!(),
|
||||||
|
|
@ -161,7 +163,7 @@ pub async fn handle_get(
|
||||||
}
|
}
|
||||||
})
|
})
|
||||||
.buffered(2);
|
.buffered(2);
|
||||||
//let body: Body = Box::new(StreamBody::new(Box::pin(body_stream)));
|
|
||||||
let body = hyper::body::Body::wrap_stream(body_stream);
|
let body = hyper::body::Body::wrap_stream(body_stream);
|
||||||
Ok(resp_builder.body(body)?)
|
Ok(resp_builder.body(body)?)
|
||||||
}
|
}
|
||||||
|
|
@ -181,9 +183,10 @@ pub async fn handle_get_range(
|
||||||
}
|
}
|
||||||
|
|
||||||
let resp_builder = object_headers(version, version_meta)
|
let resp_builder = object_headers(version, version_meta)
|
||||||
|
.header("Content-Length", format!("{}", end - begin))
|
||||||
.header(
|
.header(
|
||||||
"Content-Range",
|
"Content-Range",
|
||||||
format!("bytes {}-{}/{}", begin, end, version_meta.size),
|
format!("bytes {}-{}/{}", begin, end - 1, version_meta.size),
|
||||||
)
|
)
|
||||||
.status(StatusCode::PARTIAL_CONTENT);
|
.status(StatusCode::PARTIAL_CONTENT);
|
||||||
|
|
||||||
|
|
@ -206,35 +209,49 @@ pub async fn handle_get_range(
|
||||||
None => return Err(Error::NotFound),
|
None => return Err(Error::NotFound),
|
||||||
};
|
};
|
||||||
|
|
||||||
let blocks = version
|
// We will store here the list of blocks that have an intersection with the requested
|
||||||
.blocks()
|
// range, as well as their "true offset", which is their actual offset in the complete
|
||||||
.iter()
|
// file (whereas block.offset designates the offset of the block WITHIN THE PART
|
||||||
.cloned()
|
// block.part_number, which is not the same in the case of a multipart upload)
|
||||||
.filter(|block| block.offset + block.size > begin && block.offset < end)
|
let mut blocks = Vec::with_capacity(std::cmp::min(
|
||||||
.collect::<Vec<_>>();
|
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)
|
let body_stream = futures::stream::iter(blocks)
|
||||||
.map(move |block| {
|
.map(move |(block, true_offset)| {
|
||||||
let garage = garage.clone();
|
let garage = garage.clone();
|
||||||
async move {
|
async move {
|
||||||
let data = garage.block_manager.rpc_get_block(&block.hash).await?;
|
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
|
0
|
||||||
} else {
|
} 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
|
block.size
|
||||||
} else {
|
} else {
|
||||||
end - block.offset
|
end - true_offset
|
||||||
};
|
};
|
||||||
Result::<Bytes, Error>::Ok(Bytes::from(
|
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);
|
.buffered(2);
|
||||||
//let body: Body = Box::new(StreamBody::new(Box::pin(body_stream)));
|
|
||||||
let body = hyper::body::Body::wrap_stream(body_stream);
|
let body = hyper::body::Body::wrap_stream(body_stream);
|
||||||
Ok(resp_builder.body(body)?)
|
Ok(resp_builder.body(body)?)
|
||||||
}
|
}
|
||||||
|
|
|
||||||
Loading…
Reference in a new issue