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From "jack liuquan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11828) Implement the Hitchhiker erasure coding algorithm
Date Fri, 24 Apr 2015 07:18:38 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11828?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14510597#comment-14510597
] 

jack liuquan commented on HADOOP-11828:
---------------------------------------

Hi Kai,
Thank you for your review.
bq.* Please rebase with latest branch. Your codebase is rather old.
sorry, I'm not sure. I add my codes based on the latest HDFS-7285 branch. Is that not right?
bq.* Please remove codes for other modes for now, even in tests.
OK, I will remove the codes not used in Hitchhiker-XOR.

> Implement the Hitchhiker erasure coding algorithm
> -------------------------------------------------
>
>                 Key: HADOOP-11828
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11828
>             Project: Hadoop Common
>          Issue Type: Sub-task
>            Reporter: Zhe Zhang
>            Assignee: jack liuquan
>         Attachments: 7715-hitchhikerXOR-v2-testcode.patch, 7715-hitchhikerXOR-v2.patch,
HADOOP-11828-hitchhikerXOR-V3.patch, HDFS-7715-hhxor-decoder.patch, HDFS-7715-hhxor-encoder.patch
>
>
> [Hitchhiker | http://www.eecs.berkeley.edu/~nihar/publications/Hitchhiker_SIGCOMM14.pdf]
is a new erasure coding algorithm developed as a research project at UC Berkeley. It has been
shown to reduce network traffic and disk I/O by 25%-45% during data reconstruction. This JIRA
aims to introduce Hitchhiker to the HDFS-EC framework, as one of the pluggable codec algorithms.
> The existing implementation is based on HDFS-RAID. 



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