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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-7345) Local Repairable Codes (LRC)
Date Tue, 31 Mar 2015 17:35:55 GMT

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

Zhe Zhang updated HDFS-7345:
----------------------------
    Parent Issue: HDFS-8031  (was: HDFS-7285)

> 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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