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https://issues.apache.org/jira/browse/HADOOP-11828?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15488649#comment-15488649
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Kai Zheng commented on HADOOP-11828:
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bq. I want to know weather Hitch Hiker is attached to Hadoop or not and if it
is attached I want to know more about its commands.
Good question. Yes and no. Hitchhiker coder is already in the codebase in
Hadoop common side, but not attached to HDFS side yet. Currently HDFS uses raw
erasure coder API doing all the work, but HH coder is implemented in erasure
coder API. Evolving HDFS towards using erasure coders is still on going, but
kept as low priority in my side. I'd like to provide some help if anyone would
push this, though.
> 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-alpha1
> Reporter: Zhe Zhang
> Assignee: jack liuquan
> Fix For: 3.0.0-alpha1
>
> 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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