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Add "historical document" note to ring background docs

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Change-Id: Ib00193b62c1f35b06a93f261bd6cb0d2f9167b86
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Tim Burke 2018-11-02 17:21:19 +00:00
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commit 887ba87c5a
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doc/source/ring_background.rst
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@ -2,14 +2,23 @@
Building a Consistent Hashing Ring
==================================
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Authored by Greg Holt
---------------------
------------------------------------
Authored by Greg Holt, February 2011
------------------------------------
This is a compilation of five posts I made earlier discussing how to build
a consistent hashing ring. The posts seemed to be accessed quite frequently,
so I've gathered them all here on one page for easier reading.
.. note::
This is an historical document; as such, all code examples are Python 2.
If this makes you squirm, think of it as pseudo-code. Regardless of
implementation language, the state of the art in consistent-hashing and
distributed systems more generally has advanced. We hope that this
introduction from first principles will still prove informative,
particularly with regard to how data is distributed within a Swift
cluster.
Part 1
======
"Consistent Hashing" is a term used to describe a process where data is