finish slides for ActivityPubConf
- add some notes - add own Fediverse ID
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After Width: | Height: | Size: 19 KiB |
BIN
talk-slides.pdf
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talk-slides.pdf
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|
|
@ -245,9 +245,9 @@ Hashtags are used for marking posts about certain topics or events:
|
|||
|
||||
\begin{frame}{State of Hashtags on the Fediverse}{Fragmentation}
|
||||
\begin{itemize}
|
||||
\item fragmented view on hashtag posts depending on user's instance
|
||||
\item hashtag search only on locally known posts
|
||||
\item Result: incentive to cluster on large nodes \(\Leftarrow\) centralisation
|
||||
\item fragmented view on hashtag posts depending on user's instance\note[item]{view depends on users instance}
|
||||
\item hashtag search only on locally known posts\note[item]{local posts}
|
||||
\item Result: incentive to cluster on large nodes \(\Leftarrow\) centralisation\note[item]{cluster incentive}
|
||||
\end{itemize}
|
||||
|
||||
\end{frame}
|
||||
|
|
@ -283,7 +283,11 @@ Hashtags are used for marking posts about certain topics or events:
|
|||
\begin{itemize}
|
||||
\item similar, but allows subscribing to certain tags only
|
||||
\end{itemize}
|
||||
|
||||
\note{relays\\
|
||||
centralised actors, single point\\
|
||||
which one to choose?\\
|
||||
all posts -> overload\\
|
||||
after subscription}
|
||||
|
||||
\end{itemize}
|
||||
|
||||
|
|
@ -300,9 +304,10 @@ Hashtags are used for marking posts about certain topics or events:
|
|||
\item \textbf{store \& query}: instances can retrieve 1 year of history for a hashtag without subscription
|
||||
\item fully decentralised, no single point of authority for all tags
|
||||
\end{itemize}
|
||||
\note{2 goals: relay \& subscribe; store \& query; fully decentralised}
|
||||
\end{frame}
|
||||
|
||||
\begin{frame}{System Architecture}{adding a DHT backend to the fediverse}
|
||||
\begin{frame}{System Architecture}{adding a DHT backend to the Fediverse}
|
||||
|
||||
\note[item]{subscription to all posts of a user possible because there is a single responsible instance}
|
||||
core idea: distribute responsibility for tags among instances using a \textbf{D}istributed \textbf{H}ash \textbf{T}able, \note[item]{distribute responsibility for posts of a hashtag = relaying \& storage}
|
||||
|
|
@ -311,7 +316,7 @@ based on Chord \cite{stoicaChordScalablePeertopeer2003}
|
|||
%ToDo for Kolloquium: reason for Chord
|
||||
|
||||
\note[item]{DHT: structured P2P networks, self-organising, no central authority}
|
||||
\note[item]{ provides efficient (log N) key-value storage and lookup}
|
||||
\note[item]{provides efficient (log N) key-value storage and lookup}
|
||||
|
||||
\end{frame}
|
||||
|
||||
|
|
@ -319,9 +324,10 @@ based on Chord \cite{stoicaChordScalablePeertopeer2003}
|
|||
\begin{columns}
|
||||
\begin{column}{0.4\textwidth}
|
||||
\begin{itemize}
|
||||
\item calculate hash value of keys and node IDs
|
||||
\note[item]{common namespace for nodes and lookup keys}
|
||||
\item calculate hash value of hashtags and node IDs
|
||||
\item place these hashes onto the same circular name space
|
||||
\item each node keeps routing table of \(\log \#number\_nodes\) entries\note[item]{joining and leaving covered in paper}
|
||||
\item each node keeps routing table of \(\log \#number\_nodes\) entries\note[item]{routing table entries to distances of powers of 2}
|
||||
\end{itemize}
|
||||
\end{column}
|
||||
|
||||
|
|
@ -335,9 +341,11 @@ based on Chord \cite{stoicaChordScalablePeertopeer2003}
|
|||
\begin{columns}
|
||||
\begin{column}{0.55\textwidth}
|
||||
\begin{itemize}
|
||||
\item next nodeID \(\geq\) \texttt{hash(hashtag)} (mod keyspace size) is responsible for handling posts containing \texttt{hashtag}
|
||||
\item responsible node for a key \(k\) is node \(successor(k) = \min_i(k+i) \mod\) keyspace\_size
|
||||
\item DHT used for iterative lookup of responsible relay/ storage node
|
||||
\item my architecture: namespace = \(2^{256}\) with 256bit-long IDs
|
||||
\note[item]{iterative lookup of responsible successor node of key}
|
||||
\item my architecture: keyspace = \(2^{256}\) with 256bit-long IDs
|
||||
\note[item]{i use keyspace of \(2^{256}\)}
|
||||
\end{itemize}
|
||||
\end{column}
|
||||
|
||||
|
|
@ -359,18 +367,9 @@ based on Chord \cite{stoicaChordScalablePeertopeer2003}
|
|||
|
||||
\end{frame}
|
||||
|
||||
\begin{frame}{Publishing, Relaying and Storage}
|
||||
\begin{itemize}
|
||||
\item separate DHTs for relay and storage instances
|
||||
\item all actions after DHT lookup supposed to be done using ActivityPub via HTTPS
|
||||
\item subscription to hashtags/ querying posts is done at the responsible instance
|
||||
\end{itemize}
|
||||
|
||||
\end{frame}
|
||||
|
||||
\begin{frame}
|
||||
\note{so far so easy.\\
|
||||
what hashtags does a certain instance handle?\\
|
||||
what hashtags does a certain instance handle? determined by node ID\\
|
||||
can it bear the load?}
|
||||
\begin{itemize}
|
||||
\item node ID determines set of hashtags handled by instance
|
||||
|
|
@ -411,7 +410,7 @@ distribution of posts per hashtag follows a steep power law
|
|||
\begin{columns}
|
||||
\begin{column}{0.55\textwidth}
|
||||
\begin{itemize}
|
||||
\item store redundant copies of hashtag data at equal distances on Chord ring, inspired by Harvesf and Blough \cite{harvesfEffectReplicaPlacement2006}\note{resilience against node failure, allows data validation through cross-checking}
|
||||
\item redundant assignment of responsibility for hashtag at equal distances on Chord ring, inspired by Harvesf and Blough \cite{harvesfEffectReplicaPlacement2006}\note{resilience against node failure, allows data validation through cross-checking}
|
||||
\item default redundancy: \(2^2 = 4\), scalable in powers of 2
|
||||
\item \textbf{relay nodes}: hot standby nodes take over in overload situations (load spikes)
|
||||
\item \textbf{storage nodes}: overloaded nodes can split stored posts by content hash and double redundancy set
|
||||
|
|
@ -442,8 +441,11 @@ Do we even want global hashtags in the Fediverse?
|
|||
|
||||
\begin{itemize}
|
||||
\item positive potential (conversation, coordination) vs. negative potential (spam, harrassment)
|
||||
\note[item]{positive vs negative potential}
|
||||
\item visibility level: public posts only, unlisted, new level necessary?
|
||||
\note[item]{visibility levels}
|
||||
\item relaying post URI only should provide plausible deniability and retractability
|
||||
\note[item]{retractability should be given}
|
||||
\end{itemize}
|
||||
\end{frame}
|
||||
|
||||
|
|
@ -454,8 +456,11 @@ Do we even want global hashtags in the Fediverse?
|
|||
|
||||
\begin{itemize}
|
||||
\item intended as opt-in, domain-based push federation still better for user subscriptions
|
||||
\item assumption: instances offer \(5.5\times\) the storage \& \(2.5\times\) the bandwith of own posts
|
||||
\note[item]{optional mechanism}
|
||||
\item assumption: instances offer \(5.5\times\) the storage \& \(2.5\times\) the bandwidth of own posts
|
||||
\note[item]{assumptions: 5.5x storage, 2.5x bandwidth}
|
||||
\item performance: Can this be implemented efficiently enough to not DDoS popular hashtag nodes?
|
||||
\note[item]{performance: fetch DDoS of popular tags}
|
||||
\begin{itemize}
|
||||
\item batched retrieval of posts from same source
|
||||
\item exponential backoff retries
|
||||
|
|
@ -554,6 +559,9 @@ node ID derivation}
|
|||
|
||||
\includegraphics[height=0.4\paperheight]{figures/qr_paper.png}\\
|
||||
\large\url{https://git.orlives.de/schmittlauch/paper_hashtag_federation/src/branch/master/paper_hashtag_federation.pdf}
|
||||
\vspace{2em}
|
||||
|
||||
\Large\includegraphics[height=1em]{figures/fediverse_logo.pdf} @schmittlauch@toot.matereal.eu
|
||||
|
||||
\end{frame}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue