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From "Marcell Feher (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11503) Integrate Chocolate Cloud RS coder implementation
Date Tue, 07 Mar 2017 08:51:32 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11503?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15898978#comment-15898978

Marcell Feher commented on HDFS-11503:

We are working on fixing compatibility issues with the existing Reed-Solomon codecs, it is
not an issue for this particular plugin. 

However I see a more general problem here. There are several other erasure coding algorithms
like LRC whose integration should be possible by the HDFS-EC framework. (as a side-comment:
our company specializes in using Random Linear Network Coding for storage and we are exploring
the possibilities of an RLNC plugin to HDFS). 
My point: to make the system future-proof, I think the framework shouldn't assume that codecs
are compatible with each other. 

> Integrate Chocolate Cloud RS coder implementation
> -------------------------------------------------
>                 Key: HDFS-11503
>                 URL: https://issues.apache.org/jira/browse/HDFS-11503
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: erasure-coding
>    Affects Versions: 3.0.0-alpha2
>            Reporter: Andrew Wang
>            Assignee: Marcell Feher
> Quote from Marcell on HDFS-7285:
> First of all let me introduce ourselves: we are Chocolate Cloud from Denmark, we use
erasure coding to improve storage solutions. We already have Reed-Solomon and Random Linear
Network Coding backends for Liberasurecode, and now we are at the final stage of developing
our RS plugin to HDFS-EC. The performance of our plugin is similar to ISA-L's, in some configurations
we are better, in others we are worse (our initial speed comparison charts can be found here:
> We would like our plugin to become officially supported in Hadoop 3.0. We can already
provide a preliminary version of our (native) library and a patch with the necessary glue
code for the next alpha release.
> I'd like to know your thoughts about whether it's possible and how it could be achieved.
> P.S: I'm happy to share more details if there's interest

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