Btree Nosql Oak

Nov 3, 20092 likes1,814 views

CouchDB is an append-only database that uses B-tree indexes to allow for efficient key lookups and range scans. It supports concurrent reads and writes through an append-only design that never overwrites data and incremental map reduce. CouchDB was designed to embrace the philosophies of HTTP, making data useful independent of location through replication.

Apache
CouchDB
Monday, November 2, 2009

how couchdb treats the disks
append only btree

Replication
JSON
Map Reduce
HTTP
Monday, November 2, 2009

intro:
offline apps
simple development
easy to deploy

Stuart Langridge - Canonical

! !

Monday, November 2, 2009

15 million desktops by the end of the year.
solve the data island problem

Monday, November 2, 2009

raindrop - next gen messaging platform
name: your own personal piece of the cloud

Monday, November 2, 2009

Couchapps
-- easiest way to deploy an Ajax application that needs to store data.
-- capable of scaling up with CouchDB. (etags etc)

“Ground Computing”
@jhuggins

http://www.ﬂickr.com/photos/mcpig/872293700/
Monday, November 2, 2009

app runs near the user. lower latency, lower cost.

Oﬄine by Default

http://www.ﬂickr.com/photos/shane-h/280084650
Monday, November 2, 2009

reliable
telephone poles / like akamai but for dynamic database backed applications.
- same application on the client and server or the cloud

http://apod.nasa.gov/apod/ap050930.html

“Of the Web”

http://jacobian.org/writing/of-the-web/

Monday, November 2, 2009
Let me tell you something: Django may be built for the Web, but CouchDB is built of the Web. I've never seen software that so
completely embraces the philosophies behind HTTP. ... this is what the software of the future looks like. Jacob Kaplan-Moss --
October, 2007

perfect spot - discovered not invented

When you can move data via replication, it

changes the physics of the web

so data is useful independent of location.

Lockless
Storage
Monday, November 2, 2009

html5 story

js

ruby

transactions?

-- getting CouchDB right involves going all the way to core lockless storage engine.

performance, map reduce, and deployment

B-Tree

Monday, November 2, 2009

data structure
sorted by keys
minimize disk seeks

Monday, November 2, 2009

indexes - efficient
key lookups
range scans

Append

Only
Monday, November 2, 2009

robust / reliable
never touch bytes that are on disk
can’t be inconsistent

Monday, November 2, 2009

append only - in action
update J to a new value (rewrite j’s leaf node)

Monday, November 2, 2009

rewrite the path along the tree to J
up the parent path until we write the root.

Monday, November 2, 2009

all pointers point backwards into the ﬁle

Monday, November 2, 2009

update cost?

only has O(log n) cost where n is the # of keys

Monday, November 2, 2009

another update - add 5.

rewrite path to Z node to add 5

Monday, November 2, 2009

time follows the blue arrow.
top half is actually an accumulation of updates like the bottom.
note: batch efficiency -- save block updates

Monday, November 2, 2009

2 day test run
couchdb over long haul
4 writers, 16 readers, random access, small keyspace - lots of 409s etc.

Incremental

Reduce
Monday, November 2, 2009

takes advantage of the write pattern we’ve seen
setup main storage doc count example

Monday, November 2, 2009

rereduce = false
count # of keys in the block

Monday, November 2, 2009

rereduce = true
sum # of docs in child nodes
ﬂexible range querying

Monday, November 2, 2009

intermediate reductions stored during a view calculation
updating J doesn’t change any counts, adding the 5 key does

Monday, November 2, 2009

we are rewriting the parent nodes anyway, so it makes sense to run the reduce calculation

Concurrent
Access
Monday, November 2, 2009

readers see a consistent view
we can support many readers
reads don’t block writes
writes don’t block reads

Monday, November 2, 2009

concurrent readers
list all docs, then a write comes in, you don’t want to be surprised by an extra doc
readers can be as long lived as they want without blocking writers or seeing inconsistencies

Local Web
Platform
Monday, November 2, 2009

user interviews

http://www.longnow.org/projects/clock/orrery/
Monday, November 2, 2009

append-only
no ﬁxup phase
reliable and concurrent
sequential write pattern (few writer seeks)
hot backups
compaction

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This document summarizes a presentation about Apache CouchDB. Some key points: - CouchDB is a scalable, distributed key-value database that uses peer-to-peer replication. It has an append-only file structure and is designed to handle crashes well. - Data is stored in JSON documents with dynamic schemas. Views are built using JavaScript map-reduce functions. - The API is RESTful HTTP and works natively with the web. Data can be queried and rendered directly in the browser using JavaScript. - CouchDB embraces web technologies and can scale from smartphones to server clusters. It is open source and embraces an open philosophy.

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