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Riak

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by Daniel Reverri on 28 April 2010

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Transcript of Riak

Finding Riak
Getting to know Riak Webmachine Building RESTful Services Erlang/OTP
Rebar Vnodes Pluggable Backends
ETS
DETS
Innostore
Bitcask (just released)
Rails
Django
Twisted
Sinatra Nothing special
Just another node Cluster Erlang
Javascript no master node
no single point of failure Add node
+1 capacity
+1 computation 160-bit integer space divided into equally sized partitions
(ring_creation_size)

evenly distributed across entire cluster each partition is claimed by a vnode

several vnodes run per node REST Phases
Chainable
Runs near the data Documents may have multiple values
Merged by vector clocks
Two options for conflicts
Last write wins (allow_mult per bucket)
Bubble up to application N = Number of replicas (per bucket)
R = Number of replicas needed for read (per request)
W = Number of replicas needed for write (per request)
DW = Number of replicas needed for durable write (per request) WTF
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