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https://issues.apache.org/jira/browse/HADOOP-11828?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15154603#comment-15154603
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Rashmi Vinayak commented on HADOOP-11828:
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Thanks a lot for the clarifications, [~jack_liuquan] and [~drankye]! I was
concerned by the name containing the term 'Raw' in it as in my understanding,
'xRawCoders' stand for pure Java ones and the the plain 'xCoders' stand for the
ISA-L ones.
bq. RSRawDecoder2 is the new Java one (compatible with ISA-L coder)
Could you please clarify what 'compatible with ISA-L coder' means? Does it mean
that when you use RSRawDecoder2, it uses ISA-L implementation if the hardware
allows and if not uses the Java one? Or is this selection done through
Configuration too?
> 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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