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https://issues.apache.org/jira/browse/HDFS-7715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14353702#comment-14353702
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Zhe Zhang commented on HDFS-7715:
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Some questions from understanding the current Hitchhiker implementation:
# Is jointEncodeSubPacketsNew() in PiggyBackCode class the implemention of
Hitchhiker-XOR+ and Hitchhiker-nonXOR ?
# Is generatorMatrixForParity used for Hitchhiker-nonXOR? Why not used the
default Vandermonde matrix ? Is there any special characteristics in
generatorMatrixForParity ?
# generatorMatrixForParity is hard coding for (10,4). for Generalization to any
(k, r), how can I modify the generatorMatrixForParity?
> 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% and
> 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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