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Prophet - Beijing Perl Workshop

The document introduces Prophet, an open source peer-to-peer replicated database designed for offline and disconnected use. It aims to provide an alternative to cloud computing by allowing users to own and control their own data. The document discusses Prophet's architecture, capabilities for conflict resolution and synchronization, and potential applications like a bug tracking system called SD. It encourages readers to get involved by helping with improvements and developing new applications that can take advantage of Prophet's capabilities.

Technology◦Spiritual◦

Prophet
a path out of the cloud
http://syncwith.us
jesse@bestpractical.com

You may know me from...
RT (Request Tracker)
Jifty
SVK
Hiveminder
Perl 6
T-shirts

I’ve been hacking on an
open source database
called “Prophet”

It has an API like
Amazon SimpleDB or
Google App Engine’s...

It’s built for P2P
replication and
disconnected use

...with tools you
couldn’t really afford

You paid for it with
part of your harvest...

In a bad year, you got
further in debt to
the land owner

So, what does this have
to do with software?

You ran code you didn’t
own on hardware you
didn’t own

Things started to get
better in the 1980s

Users started to be
able to make choices
about computing...

Sometimes new
versions of software
broke things...

...leaving you locked in
to old versions

What happens when
your favorite service
goes down?

...or starts making
arbitrary choices about
what’s ‘safe’ content?

When a service
provider cuts you off,
you lose

Not so secret shame:
I still need the cloud

I make a Web 2.0 todo
list service called
Hiveminder.com

☣ Using hosted apps
is going to hurt you! ☣

Great. now you can use
your word processer
while you’re ofﬂine!

Real ofﬂine apps
should not need servers

Real ofﬂine apps
should sync like you do

CL lives in Taipei
Jesse lives in Boston

TPE - BOS:
TPE - HNL:
BOS - HNL:
9410 mi
5,095 mi
5,069 mi

Step 1: Go to Hawaii for “work”
Step 2: ???
Step 3: Prophet!
Our Plan

The Plan Backﬁred
We were there for 8 days
We wrote 8000 lines of Perl
We ﬁgured out step 2

Step 2:
Build a Disconnected
Syncable Database

Fallacies of Distributed Computing
1.The network is reliable.
2. Latency is zero.
3. Bandwidth is inﬁnite.
4.The network is secure.
5.Topology doesn't change.
6.There is one administrator.
7.Transport cost is zero.
8.The network is homogeneous.

A grounded, peer to peer
replicated, disconnected,
versioned, property
database with self-healing
conﬂict resolution
Prophet

grounded
Runs at the edge
Doesn’t need to run in the cloud
Syncs with services you already use
(Adaptors talk to “Foreign Replicas”)

Update any replica
Pull from any replica
Push to any replica
Publish a replica
Changes will propagate
peer-to-peer replicated

Real-time replication is hard to scale
It only “works” with constant connectivity
I don’t have constant connectivity
Neither do you
Prophet sync can happen whenever
disconnected

Every update is recorded as a change set
Change sets don’t lose any data
(so you can use them to go backwards)
All history is introspectable
Replication just replays changesets
versioned

Atomic operations
CREATE, READ, UPDATE, DELETE, SEARCH
Record types can have optional validation
and canonicalization
Records of the same type do not need to
have the same properties
Add and remove properties at will
property database

Remembers all conﬂict resolutions
Syncs all resolutions with your peers
Detects identical conﬂicts
Uses your peers’ resolutions to “vote” for
the winner of a conﬂict
self-healing
conﬂict resolution

RESTy API
GET /records.json
GET /records/Cars.json
GET /records/Cars/716499-5F9-4AC4-827.json
GET /records/Cars/716499-5F9-4AC4-827/wheels.json
POST /records/Cars.json
POST /records/Cars/716499-5F9-4AC4-827.json
POST /records/Cars/716499-5F9-4AC4-827/wheels.json

RESTy API
Yes, we should be using PUT and DELETE
(or just provide an OpenRESTY adaptor)
Yes, you can have a commit bit and
help us ﬁx it :)

$Native API (Yes, the core is Perl.) my $cli = Prophet::CLI->new(); my $cxn = $cli->app_handle->handle; my $record = Prophet::Record->new( handle => $cxn, type => 'Person' ); my $uuid = $record->create( props => { name => 'Jesse', age => 31 } ); $record->set_prop( name => 'age', value => 32 ); my $people = Prophet::Collection->new( handle => $cxn, type => 'Person' ); $people->matching( sub { shift->prop('species') ne 'cat' } );$

A bug tracker: “simple defects”
•id. Status, Summary
•(Arbitrary other properties too)
•History
•Comments
•Attachments
sd

./bin/sd ticket create --
summary="Can't sync sd with Google Code"
status=new
Created ticket 5 (93BF979E-08C1-11DD-94C3-D4B1FCEE7EC4)
Create

./bin/sd ticket search --regex publish
29 } new the online help doesn't describe publish
34 } new publish a static html view of records
35 } new publish should create a static rss file
List and Search

./bin/sd ticket update
--uuid 93BF979E-08C1-11DD-94C3-D4B1FCEE7EC4
-- status=resolved
Updates

Jesse
sd publish --to fsck.com:public_html/sd/
CL
sd clone --from http://my.com/~jesse/sd
Sync!

Jesse
sd server
CL
sd pull --local
Hackathon mode!

Actually, mine use two:
• RT
• hiveminder.com
My project has a bug tracker

Foreign Replicas
Prophet makes Foreign Replicas easy
SD gets them "for free"

(Using only the public REST API)
It took an afternoon
Mirror an RT instance into SD
Share it with your peers using prophet
Sync changes back from your peers to RT
Supports Comments and Attachments
Wrote an RT Replica for SD

Prophet - Beijing Perl Workshop

1.
Prophet a path outof the cloud http://syncwith.us jesse@bestpractical.com
2.
You may knowme from... RT (Request Tracker) Jifty SVK Hiveminder Perl 6 T-shirts
3.
I’ve been hackingon an open source database called “Prophet”
4.
It has anAPI like Amazon SimpleDB or Google App Engine’s...
5.
It’s designed for “team-scale”apps
6.
It’s built forP2P replication and disconnected use
7.
But ﬁrst, abrief digression...
8.
...about cloud computing ☁ ☔
9.
Living in thecloud = sharecropping（佃农)
10.
(That’s bad) ☹
11.
The bad olddays:
12.
Pic of sharecroppers
13.
You farmed landyou didn’t own...
14.
...with tools you couldn’treally afford
15.
You paid forit with part of your harvest...
16.
It sounded likea pretty sweet deal...
17.
...until things gotbad
18.
(Things always gotbad)
20.
(Internet)
21.
(Cloud) (Internet)
22.
In a badyear, you got further in debt to the land owner
24.
So, what doesthis have to do with software?
25.
The (more recent) badold days:
26.
pic of mainframes
27.
You ran codeyou didn’t own on hardware you didn’t own
28.
Things started toget better in the 1980s
30.
Pic of PCs
31.
Users started tobe able to make choices about computing...
32.
They weren’t allrosy
33.
Pic of BSOD
34.
Sometimes new versions ofsoftware broke things...
35.
...leaving you lockedin to old versions
36.
pic of win31?
37.
Things got ‘better’
38.
rms che
39.
Now, things aregetting worse again...
41.
What happens when yourfavorite service goes down?
42.
pic of twitterbeing down
43.
...or stops accepting newsignups?
45.
...or starts making arbitrarychoices about what’s ‘safe’ content?
47.
...or breaks
49.
You don’t ownthe services you use
50.
You probably don’t evenhave a contract
51.
When a service providercuts you off, you lose
52.
Not so secretshame: I still need the cloud
53.
My calendar livesat google.com
55.
I make aWeb 2.0 todo list service called Hiveminder.com
56.
pic of hiveminder
57.
☣ Using hostedapps is going to hurt you! ☣
58.
What about Google Gears,AdobeAir, etc?
59.
Great. now youcan use your word processer while you’re ofﬂine!
60.
Pic of wordperfect
61.
Real ofﬂine apps shouldnot need servers
62.
Real ofﬂine apps shouldsync like you do
63.
Back to that databasething...
64.
JesseVincent
65.
Chia-liang Kao
66.
We work together
67.
CL lives inTaipei Jesse lives in Boston
68.
Sometimes we need towork face to face
69.
TPE - BOS: TPE- HNL: BOS - HNL: 9410 mi 5,095 mi 5,069 mi
70.
Step 1: Goto Hawaii for “work” Step 2: ??? Step 3: Prophet! Our Plan
71.
The Plan Backﬁred Wewere there for 8 days We wrote 8000 lines of Perl We ﬁgured out step 2
72.
Step 2: Build aDisconnected Syncable Database
73.
Fallacies of DistributedComputing 1.The network is reliable. 2. Latency is zero. 3. Bandwidth is inﬁnite. 4.The network is secure. 5.Topology doesn't change. 6.There is one administrator. 7.Transport cost is zero. 8.The network is homogeneous.
74.
A grounded, peerto peer replicated, disconnected, versioned, property database with self-healing conﬂict resolution Prophet
75.
What do allthose buzzwords mean?
76.
grounded Runs here
77.
grounded Not here
78.
grounded Runs at theedge Doesn’t need to run in the cloud Syncs with services you already use (Adaptors talk to “Foreign Replicas”)
79.
Update any replica Pullfrom any replica Push to any replica Publish a replica Changes will propagate peer-to-peer replicated
80.
Real-time replication ishard to scale It only “works” with constant connectivity I don’t have constant connectivity Neither do you Prophet sync can happen whenever disconnected
81.
Every update isrecorded as a change set Change sets don’t lose any data (so you can use them to go backwards) All history is introspectable Replication just replays changesets versioned
82.
Atomic operations CREATE, READ,UPDATE, DELETE, SEARCH Record types can have optional validation and canonicalization Records of the same type do not need to have the same properties Add and remove properties at will property database
83.
Remembers all conflictresolutions Syncs all resolutions with your peers Detects identical conflicts Uses your peers’ resolutions to “vote” for the winner of a conflict self-healing conflict resolution
84.
Working with Prophet
85.
RESTy API GET /records.json GET/records/Cars.json GET /records/Cars/716499-5F9-4AC4-827.json GET /records/Cars/716499-5F9-4AC4-827/wheels.json POST /records/Cars.json POST /records/Cars/716499-5F9-4AC4-827.json POST /records/Cars/716499-5F9-4AC4-827/wheels.json
86.
RESTy API Yes, weshould be using PUT and DELETE (or just provide an OpenRESTY adaptor) Yes, you can have a commit bit and help us ﬁx it :)
87.
Native API (Yes, thecore is Perl.) my $cli = Prophet::CLI->new(); my $cxn = $cli->app_handle->handle; my $record = Prophet::Record->new( handle => $cxn, type => 'Person' ); my $uuid = $record->create( props => { name => 'Jesse', age => 31 } ); $record->set_prop( name => 'age', value => 32 ); my $people = Prophet::Collection->new( handle => $cxn, type => 'Person' ); $people->matching( sub { shift->prop('species') ne 'cat' } );
88.
What could youbuild with Prophet?
89.
A bug tracker:“simple defects” •id. Status, Summary •(Arbitrary other properties too) •History •Comments •Attachments sd
90.
Initialize ./bin/sd init
91.
./bin/sd ticket create-- summary="Can't sync sd with Google Code" status=new Created ticket 5 (93BF979E-08C1-11DD-94C3-D4B1FCEE7EC4) Create
92.
./bin/sd ticket search--regex publish 29 } new the online help doesn't describe publish 34 } new publish a static html view of records 35 } new publish should create a static rss file List and Search
93.
./bin/sd ticket update --uuid93BF979E-08C1-11DD-94C3-D4B1FCEE7EC4 -- status=resolved Updates
94.
Bugs on mylaptop aren’t interesting.
95.
Jesse sd publish --tofsck.com:public_html/sd/ CL sd clone --from http://my.com/~jesse/sd Sync!
96.
Jesse sd server CL sd pull--local Hackathon mode!
97.
My project hasa bug tracker
98.
Actually, mine usetwo: • RT • hiveminder.com My project has a bug tracker
99.
Foreign Replicas Prophet makesForeign Replicas easy SD gets them "for free"
100.
(Using only thepublic REST API) It took an afternoon Mirror an RT instance into SD Share it with your peers using prophet Sync changes back from your peers to RT Supports Comments and Attachments Wrote an RT Replica for SD

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