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https://issues.apache.org/jira/browse/HDFS-3731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13425798#comment-13425798
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Robert Joseph Evans commented on HDFS-3731:
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I thought that hardlinks to directories are not typically supported. HSF+ on
the mac is the only one I know of that allows it. I am nervous about
implementing an upgrade path that will only work on a Mac. Did you actually
mean a symbolic link, or did you intend to hardlink all of the files in the
directories?
> 2.0 release upgrade must handle blocks being written from 1.0
> -------------------------------------------------------------
>
> Key: HDFS-3731
> URL: https://issues.apache.org/jira/browse/HDFS-3731
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: data-node
> Affects Versions: 2.0.0-alpha
> Reporter: Suresh Srinivas
> Assignee: Todd Lipcon
> Priority: Blocker
>
> Release 2.0 upgrades must handle blocks being written to (bbw) files from 1.0
> release. Problem reported by Brahma Reddy.
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