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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HADOOP-12010) Inter-operable between Java RS erasure coder and native RS erasure coder
Date Wed, 05 Oct 2016 18:37:20 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-12010?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Andrew Wang resolved HADOOP-12010.
    Resolution: Not A Problem

Thanks Kai, let's close it out then. I wasn't sure what "Java coder" here meant, but as long
as the native coder and new Java coder are compatible, then we're in a good spot.

> Inter-operable between Java RS erasure coder and native RS erasure coder
> ------------------------------------------------------------------------
>                 Key: HADOOP-12010
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12010
>             Project: Hadoop Common
>          Issue Type: Sub-task
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Kai Zheng
>            Assignee: Kai Zheng
>              Labels: hdfs-ec-3.0-must-do
> It's natural and desired to support inter-operable between the two implemented RS raw
erasure coders, in other words, data encoded in one coder (like {{RSRawEncoder}}) can be decoded
using the other coder (like {{NativeRSRawDecoder}}). Without this, raw erasure coder will
not be transparent to HDFS data. As such support isn't trivial and involves challenge work
because the two implementations use different encode/decode matrix generation algorithms,
better to have this separately.

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