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https://issues.apache.org/jira/browse/HDFS-17521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17846195#comment-17846195
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ASF GitHub Bot commented on HDFS-17521:
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slfan1989 commented on PR #6813:
URL: https://github.com/apache/hadoop/pull/6813#issuecomment-2109448492
@zhangshuyan0 @haiyang1987 Could you help review this PR? I'm not very
familiar with EC, but I've noticed that you have submitted quite a few
improvements related to EC. Thank you very much!
> EC: Fix calculation errors caused by special index order
> --------------------------------------------------------
>
> Key: HDFS-17521
> URL: https://issues.apache.org/jira/browse/HDFS-17521
> Project: Hadoop HDFS
> 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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