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From "Kai Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-7345) Local Repairable Codes (LRC)
Date Thu, 13 Nov 2014 15:06:34 GMT

     [ https://issues.apache.org/jira/browse/HDFS-7345?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kai Zheng updated HDFS-7345:
----------------------------
    Attachment: LRC-compare.pdf

Added a simple slides to illustrate the differences among all the so-called LRC codes. It
doesn't serve for comparing the advantages/disadvantages, though such investigation could
be worth. I guess we could choose one more friendly to the community.

> Local Repairable Codes (LRC)
> ----------------------------
>
>                 Key: HDFS-7345
>                 URL: https://issues.apache.org/jira/browse/HDFS-7345
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Kai Zheng
>            Assignee: Kai Zheng
>         Attachments: LRC-compare.pdf
>
>
> HDFS-7285 proposes to support Erasure Coding inside HDFS, supports multiple Erasure Coding
codecs via pluggable codec framework (HDFS-7337) and implements Reed Solomon code by default.
This is to support a more advanced coding mechanism, Local Repairable Codes (LRC). As discussed
in [Xorbas Hadoop Project Page|http://smahesh.com/HadoopUSC/] and the paper attached there,
LRC can reduce the number of erasure coding chunks that need to be read when recovering missing
data chunks, while still keeping the storage overhead low.



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