[jira] [Commented] (HADOOP-19180) EC: Fix calculation errors caused by special index order

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-19180?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17854645#comment-17854645 ] 

ASF GitHub Bot commented on HADOOP-19180:
-----------------------------------------

zhengchenyu commented on PR #6813:
URL: https://github.com/apache/hadoop/pull/6813#issuecomment-2164660043

   @drankye @sodonnel @cmccabe 
   Do you have time to help review it?




> EC: Fix calculation errors caused by special index order
> --------------------------------------------------------
>
>                 Key: HADOOP-19180
>                 URL: https://issues.apache.org/jira/browse/HADOOP-19180
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Chenyu Zheng
>            Assignee: Chenyu Zheng
>            Priority: Critical
>              Labels: pull-request-available
>
> I found that if the erasedIndexes distribution is such that the parity index is in front of the data index, ec will produce wrong results when decoding.
> In fact, HDFS-15186 has described this problem, but does not fundamentally solve it.
> The reason is that the code assumes that erasedIndexes is preceded by the data index and followed by parity index. If there is a parity index placed in front of the data index, a calculation error will occur.



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