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https://issues.apache.org/jira/browse/HADOOP-12040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14975457#comment-14975457
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Kai Zheng commented on HADOOP-12040:
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[~hitliuyi] and [~zhz], would you help review this one? It is highly relied by
ISA-L and new Java coders. Thanks.
> Adjust inputs order for the decode API in raw erasure coder
> -----------------------------------------------------------
>
> Key: HADOOP-12040
> URL: https://issues.apache.org/jira/browse/HADOOP-12040
> Project: Hadoop Common
> Issue Type: Sub-task
> Reporter: Kai Zheng
> Assignee: Kai Zheng
> Attachments: HADOOP-12040-HDFS-7285-v1.patch, HADOOP-12040-v2.patch,
> HADOOP-12040-v3.patch
>
>
> Currently we used the parity units + data units order for the inputs,
> erasedIndexes and outputs parameters in the decode call in raw erasure coder,
> which inherited from HDFS-RAID due to impact enforced by {{GaliosField}}. As
> [~zhz] pointed and [~hitliuyi] felt, we'd better change the order to make it
> natural for HDFS usage, where usually data blocks are before parity blocks in
> a group. Doing this would avoid some reordering tricky logic.
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