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https://issues.apache.org/jira/browse/HDFS-12923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16290081#comment-16290081
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Íñigo Goiri commented on HDFS-12923:
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[~eddyxu], could you elaborate on why is not an issue?
> DFS.concat should throw exception if files have different EC policies.
> -----------------------------------------------------------------------
>
> Key: HDFS-12923
> URL: https://issues.apache.org/jira/browse/HDFS-12923
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: erasure-coding
> Affects Versions: 3.0.0
> Reporter: Lei (Eddy) Xu
> Priority: Critical
> Fix For: 3.0.0
>
>
> {{DFS#concat}} appends blocks from different files to a single file. However,
> if these files have different EC policies, or mixed with replicated and EC
> files, the resulted file would be problematic to read, because the EC codec
> is defined in INode instead of in a block.
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