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From "Wei-Chiu Chuang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11798) Native raw erasure coder in XOR codes
Date Fri, 14 Oct 2016 15:34:21 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11798?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15575663#comment-15575663
] 

Wei-Chiu Chuang commented on HADOOP-11798:
------------------------------------------

I think the latest patch generally looks to me. One nit is lack of documentation to switch
between native v.s. Java-based codec, but that can go into a new jira.

> Native raw erasure coder in XOR codes
> -------------------------------------
>
>                 Key: HADOOP-11798
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11798
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: io
>            Reporter: Kai Zheng
>            Assignee: SammiChen
>              Labels: hdfs-ec-3.0-must-do
>             Fix For: HDFS-7285
>
>         Attachments: HADOOP-11798-v1.patch, HADOOP-11798-v2.patch, HADOOP-11798-v3.patch,
HADOOP-11798-v4.patch
>
>
> Raw XOR coder is utilized in Reed-Solomon erasure coder in an optimization to recover
only one erased block which is in most often case. It can also be used in HitchHiker coder.
Therefore a native implementation of it would be deserved for performance gain.



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