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Posted to hdfs-issues@hadoop.apache.org by "Kai Zheng (JIRA)" <ji...@apache.org> on 2015/05/12 14:52:00 UTC

[jira] [Commented] (HDFS-7345) Local Repairable Codes (LRC)

    [ https://issues.apache.org/jira/browse/HDFS-7345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14539787#comment-14539787 ] 

Kai Zheng commented on HDFS-7345:
---------------------------------

I don't have bandwidth for this. Unassigned and see if any other party would work on it.

> 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
>         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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