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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7715) Implement the Hitchhiker erasure coding algorithm
Date Tue, 31 Mar 2015 17:59:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14388992#comment-14388992
] 

Zhe Zhang commented on HDFS-7715:
---------------------------------

Moving this as a follow-on work because it mainly adds new code and won't block HDFS-7285
from being merged to trunk.

> Implement the Hitchhiker erasure coding algorithm
> -------------------------------------------------
>
>                 Key: HDFS-7715
>                 URL: https://issues.apache.org/jira/browse/HDFS-7715
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Zhe Zhang
>            Assignee: jack liuquan
>         Attachments: 7715-hitchhikerXOR-v2.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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