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Add talk made on 2023-01-18 #482

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lx merged 9 commits from talk-tocatta-2023-01-18 into main 2023-01-20 11:40:09 +00:00
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doc/talks/2023-01-18-tocatta/Makefile
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@ -4,6 +4,18 @@ ASSETS=assets/consistent_hashing_1.pdf \
assets/consistent_hashing_4.pdf \ assets/consistent_hashing_4.pdf \
assets/garage_tables.pdf \ assets/garage_tables.pdf \
assets/consensus.pdf_tex \ assets/consensus.pdf_tex \
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assets/lattice2.pdf_tex \
assets/lattice3.pdf_tex \
assets/lattice4.pdf_tex \
assets/lattice5.pdf_tex \
assets/lattice6.pdf_tex \
assets/lattice7.pdf_tex \
assets/lattice8.pdf_tex \
assets/lattice9.pdf_tex \
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assets/latticeB.pdf_tex \
assets/latticeC.pdf_tex \
assets/deuxfleurs.pdf assets/deuxfleurs.pdf
talk.pdf: talk.tex $(ASSETS) talk.pdf: talk.tex $(ASSETS)

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sodipodi:role="line"
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doc/talks/2023-01-18-tocatta/talk.tex
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@ -494,8 +494,7 @@
\item \textbf{Linearizability} of all operations\\ \item \textbf{Linearizability} of all operations\\
(strongest consistency guarantee) (strongest consistency guarantee)
\vspace{1em} \vspace{1em}
\item \textbf{Replicated state machines} that can implement \item Any sequential specification can be implemented as a \textbf{replicated state machine}
any sequential specification
\vspace{1em} \vspace{1em}
\item \textbf{Costly}, the leader is a bottleneck; \item \textbf{Costly}, the leader is a bottleneck;
leader elections on failure take time leader elections on failure take time
@ -515,7 +514,7 @@
\item \textbf{Operations have to commute}, i.e.~we \item \textbf{Operations have to commute}, i.e.~we
can only implement CRDTs can only implement CRDTs
\vspace{1em} \vspace{1em}
\item \textbf{Fast}, no node is a bottleneck;\\ \item \textbf{Fast}, no single bottleneck;\\
works the same with offline nodes works the same with offline nodes
\end{itemize} \end{itemize}
} \end{minipage} } \end{minipage}
@ -530,27 +529,29 @@
\vspace{2em} \vspace{2em}
\hspace{1em} \hspace{1em}
\begin{minipage}{7cm} \begin{minipage}{6.5cm}
\underline{Consensus-based systems:} \underline{Consensus-based systems:}
\vspace{1em} \vspace{1em}
\textbf{Any sequential specification}\\~ \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} \end{minipage}
\hfill \hfill
\begin{minipage}{7cm} \begin{minipage}{6.5cm}
\underline{Weakly consistent systems:} \underline{Weakly consistent systems:}
\vspace{1em} \vspace{1em}
\textbf{CRDTs only}\\(conflict-free replicated data types) \textbf{CRDTs only}\\(conflict-free replicated data types)
\vspace{1em}
Part of the complexity is \textbf{reported to the consumer of the API}\\~
\end{minipage} \end{minipage}
\hspace{1em} \hspace{1em}
\vspace{3em}
\begin{center}
Part of the complexity is \textbf{reported to the consumer of the API}
\end{center}
\end{frame} \end{frame}
\begin{frame} \begin{frame}
@ -663,7 +664,27 @@
\end{frame} \end{frame}
\begin{frame} \begin{frame}
\frametitle{Impact on performances} \frametitle{Understanding CRDTs and quorums}
\begin{figure}
\centering
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\frametitle{Performance gains in practice}
\begin{center} \begin{center}
\includegraphics[width=.8\linewidth]{assets/endpoint-latency-dc.png} \includegraphics[width=.8\linewidth]{assets/endpoint-latency-dc.png}
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