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https://issues.apache.org/jira/browse/HDFS-17521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17846904#comment-17846904
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ASF GitHub Bot commented on HDFS-17521:
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zhengchenyu commented on PR #6813:
URL: https://github.com/apache/hadoop/pull/6813#issuecomment-2114792376
> @zhengchenyu Thanks for your explanation! I got it. This PR LGTM. I'm just
curious about one thing now: when does the parity index precede the data index
in current code? I haven't found one.
[HDFS-15186](https://issues.apache.org/jira/browse/HDFS-15186) has described
this problem, but does not fundamentally solve it.
I think we should not expect to find this scenario, and if it occurs, it
will cause problems with unrecoverable data.
> 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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