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