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https://issues.apache.org/jira/browse/HDFS-7715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14362259#comment-14362259
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Rashmi Vinayak commented on HDFS-7715:
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Hi Jack,
Yes - since the RS code currently employed in HDFS-RAID does not have the
'all-XOR-parity' property, we cannot employ Hitchhiker-XOR+ directly based on
it. Hitchhiker-XOR+ and Hitchhiker-nonXOR both have same savings in I/O and
bandwidth and same reading patterns during reconstruction. While the former can
be used over only RS codes satisfying the 'all-XOR-parity' property, the later
can be used over any RS code.
> 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
>
> [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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