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https://issues.apache.org/jira/browse/HADOOP-19180?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17847240#comment-17847240
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ASF GitHub Bot commented on HADOOP-19180:
-----------------------------------------
zhengchenyu commented on PR #6813:
URL: https://github.com/apache/hadoop/pull/6813#issuecomment-2117347235
The reported error "Doesn't support SM4 CTR." seems to be not related to
this PR. Perhaps the compiler environment has changed?
> 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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