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From "Rashmi Vinayak (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11828) Implement the Hitchhiker erasure coding algorithm
Date Thu, 18 Feb 2016 23:33:18 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11828?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15153339#comment-15153339
] 

Rashmi Vinayak commented on HADOOP-11828:
-----------------------------------------

Hi [~jack_liuquan], [~drankye],

Is there a way to check if the encoders and decoders are using the ISA-L based implementation
and not the Java ones? When looking at HHXORErasureDecodingStep, I see that 'RSRawDecoder'
is being used. Isn't 'RSRawDecoder' the older java implementation borrowed from Facebook's
HDFS-RAID? I was under the impression that RSRawDecoder is the older version and RSRawDecoder2
is the newer version. Is it not so?

Thanks,
Rashmi

> 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
>    Affects Versions: 3.0.0
>            Reporter: Zhe Zhang
>            Assignee: jack liuquan
>             Fix For: 3.0.0
>
>         Attachments: 7715-hitchhikerXOR-v2-testcode.patch, 7715-hitchhikerXOR-v2.patch,
HADOOP-11828-hitchhikerXOR-V3.patch, HADOOP-11828-hitchhikerXOR-V4.patch, HADOOP-11828-hitchhikerXOR-V5.patch,
HADOOP-11828-hitchhikerXOR-V6.patch, HADOOP-11828-hitchhikerXOR-V7.patch, HADOOP-11828-v8.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 while retaining
the same storage capacity and failure tolerance capability as RS codes. 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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