Data and IPFS Part 2: Transfer
Prompt:
Key Concepts
Incremental Verifiability
Minimize consequences of bad data
Query Planning
Planning how to split a large request into smaller requests, potentially to multiple parties, avoid duplicate data, and utilize local caches
Shared Data Model
What do both sides have to understand about the structure of the data being transferred. How
Server Concerns
What do we need to address to keep data moving, minimize resource consumption, and prevent DDOS attacks
Error Recovery
GraphSync
A Love/Hate Story
What I learned writing the world’s most advanced (overly-complicated) IPLD transfer protocol
Interactive Talk! *
* These slides aren’t done
What Is GraphSync?
GraphSync is a Libp2p protocol that allows a requestor to express an IPLD selector query to a responder, who will execute the query locally and send to the requestor all unique blocks needed to satisfy the query. ��Responses are designed to allow requestors to incrementally verify incoming data against the query.
Bitswap (v1.2) Wire Format
Graphsync (v2) Wire Format
Many Requests In One Message?
Why are responses and blocks separate?
In 2019…
I saw an opportunity. ��Though technically I was summoned to a meeting.
Selectors
A language for expressing queries against an IPLD graph.
Some selectors:
UnixFSPathSelector("subfolder/lorem.txt")
OMG!�But also, DX
GraphSync Client
Selector Query Backed By Remote Database
GraphSync Server
Is A Web Server
Backpressure
Gate selector execution on network transmission
Message Queues
Redesign the protocol. Or feel the pain.
GraphSync Extensions
All the side data you care about
GraphSync Filters
….
Key Concept:
Incremental verification against asynchronous streams with deterministic order
Lessons
Be careful what you ask for
Graphsync works. It was hard. Plan for it.
“GraphSync
is Slow”
—Everyone
01
TARGET
SERVICES
COMPANY
02
03
Here you can describe the topic of the section
Here you can describe the topic of the section
Here you can describe the topic of the section
Better
01
You can enter a subtitle here if you need it
THE SLIDE TITLE GOES HERE!
Do you know what helps to make your point clear? Lists like this: one
And the most important thing: the audience won’t miss the point of your presentation
MAYBE YOU NEED TO DIVIDE THE CONTENT
MERCURY
VENUS
Mercury is the closest planet to the Sun and
the smallest one
Venus has a beautiful name and is the second planet from the Sun
YOU COULD USE THREE COLUMNS, WHY NOT?
JUPITER
VENUS
MARS
It’s a gas giant and the biggest planet in the Solar System
Venus has a very poisonous atmosphere
Despite being red, Mars is actually a cold place
AWESOME WORDS
Because key words are great for catching your audience’s attention
THIS IS A GRAPH!
To modify this graph, click on it, follow the link, change the data and paste the new graph here
Factor 1
Factor 2
INFOGRAPHICS MAKE YOUR IDEA UNDERSTANDABLE...
15%
20%
40%
25%
Factor 1
Factor 2
Factor 3
Factor 4
… AND THE SAME GOES FOR TABLES
| MASS | DIAMETER | GRAVITY |
MERCURY | 0.06 | 0.38 | 0.38 |
MARS | 0.11 | 0.53 | 0.38 |
SATURN | 95.2 | 9.4 | 1.16 |
THIS IS A MAP!
Factor 1
Factor 2
A TIMELINE ALWAYS WORKS WELL
DAY 1
DAY 3
DAY 2
DAY 4
Earth is where we live on
Mars is a cold place
Jupiter is the biggest planet
Venus has a nice name
DO YOU PREFER THIS GRAPH?
To modify this graph, click on it, follow the link, change the data and replace it
Factor 1
Factor 2
300,000
Big numbers catch your audience’s attention
SOMETIMES, COMPARISONS ARE GOOD
CONCEPT 1
CONCEPT 2
DO YOU NEED FOUR COLUMNS?
MARS
MERCURY
JUPITER
VENUS
Despite being red, Mars is a cold place
Mercury is the closest planet to the Sun
It is the biggest planet in the Solar System
Venus has a beautiful name, but it’s hot
333,000
245,00
386,000
Mercury is the smallest planet
Jupiter is the biggest planet
Despite being red, Mars is cold
THESE ARE THE PERCENTAGES!
34%
48%
18%
Mars is a cold place
Mercury is the smallest planet
Jupiter is the biggest one
REVIEWING CONCEPTS IS A GOOD IDEA
VENUS
MARS
MERCURY
SATURN
NEPTUNE
JUPITER
Venus has a
beautiful name
Mars is actually a cold place
Mercury is the smallest planet
Saturn is the ringed one and a gas giant
It’s the farthest planet from the Sun
It’s a gas giant and the biggest one
A SUMMARY IS GOOD!
You can use bullet points to talk about the concepts. It is much more visual than a large text
WHAT THEY SAY ABOUT US?
—SARA BLACK, 19
—JOHN DOE, 31
—HELENA PATTERSON, 22
—WILL WHITMAN
“Mercury is the closest
planet to the Sun”
“Despite being red, Mars is actually a cold place”
“Jupiter is the biggest
planet of them all”
“Venus has a beautiful
name, but it’s hot”
DESKTOP SOFTWARE
You can replace the image on the screen with your own work. Just delete this one, add yours and center it properly
TABLET APP
You can replace the image on the screen with your own work. Just delete this one, add yours and center it properly
MOBILE WEB
You can replace the image on the screen with your own work. Just delete this one, add yours and center it properly
A GOOD WAY TO END THE PRESENTATION
Mercury is the closest planet to the Sun and the smallest one in the Solar System—it’s only a bit larger than the Moon
THANKS!
Do you have any questions?
addyouremail@freepik.com
+91 620 421 838
yourcompany.com
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