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https://issues.apache.org/jira/browse/HDFS-17521?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chenyu Zheng updated HDFS-17521:
--------------------------------
    Description: 
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.

> Erasure Coding: 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
>
> 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.



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