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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (CASSANDRA-755) Use a systematic online code for efficient redundancy
Date Wed, 03 Feb 2010 02:06:19 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-755?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Ellis resolved CASSANDRA-755.
--------------------------------------

    Resolution: Invalid

This is not a good fit for Cassandra.  See http://wiki.apache.org/cassandra/ArchitectureInternals
(and read the Dynamo paper).

erasure codes are a good fit when you are storing (a) relatively large pieces of data that
(b) don't care too much about latency.  neither of those applies to cassandra.

also note that jira is not a good place for "is X a good fit for cassandra?" discussions;
use the -dev mailing list for that.

> Use a systematic online code for efficient redundancy
> -----------------------------------------------------
>
>                 Key: CASSANDRA-755
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-755
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Anthony Di Franco
>            Priority: Minor
>
> Use a systematic online code for efficient redundancy (or specify why this is not appropriate
for Cassandra in the documentation).  Systematic online codes permit an arbitrarily large
or small number of repair symbols to be added to the original data to more smoothly increase
the amount of redundant storage; in particular, they would permit redundancy ratios between
1 and 2 to be used.
> See here:
> http://en.wikipedia.org/wiki/Online_codes
> and here:
> http://archipelago.rubyforge.org/svn/trunk/oneliner/
> and here:
> http://tools.ietf.org/html/rfc5053

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