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From "Sammi Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15558) Implementation of Clay Codes plugin (Coupled Layer MSR codes)
Date Thu, 02 Aug 2018 03:58:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15558?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16566317#comment-16566317
] 

Sammi Chen commented on HADOOP-15558:
-------------------------------------

Hi [~cmukka20]  and [~shreya2205], thanks for firing this JIRA.  I will take some time
to go through the design document & patch,  and provide feedback later. 

> Implementation of Clay Codes plugin (Coupled Layer MSR codes) 
> --------------------------------------------------------------
>
>                 Key: HADOOP-15558
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15558
>             Project: Hadoop Common
>          Issue Type: New Feature
>            Reporter: Chaitanya Mukka
>            Assignee: Chaitanya Mukka
>            Priority: Major
>         Attachments: ClayCodeCodecDesign-20180630.pdf, HADOOP-15558.001.patch, HADOOP-15558.002.patch
>
>
> [Clay Codes|https://www.usenix.org/conference/fast18/presentation/vajha] are new erasure
codes developed as a research project at Codes and Signal Design Lab, IISc Bangalore. A particular
Clay code, with storage overhead 1.25x, has been shown to reduce repair network traffic, disk
read and repair times by factors of 2.9, 3.4 and 3 respectively compared to the RS codes with
the same parameters. 
> This Jira aims to introduce Clay Codes to HDFS-EC as one of the pluggable erasure codec.



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