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https://issues.apache.org/jira/browse/HDFS-3137?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13240950#comment-13240950
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Suresh Srinivas commented on HDFS-3137:
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Eli, I have not reviewed the patch completely. A quick comment. Please keep the
version and corresponding feature name in LayoutVersion.java . Though these
versions are not used, it would be good to keep the history and serves as
reference to the features in HDFS.
> Bump LAST_UPGRADABLE_LAYOUT_VERSION
> -----------------------------------
>
> Key: HDFS-3137
> URL: https://issues.apache.org/jira/browse/HDFS-3137
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Eli Collins
> Assignee: Eli Collins
> Attachments: hdfs-3137.txt
>
>
> LAST_UPGRADABLE_LAYOUT_VERSION is currently -7, which corresponds to Hadoop
> 0.14. How about we bump it to -16, which corresponds to Hadoop 0.18?
> I don't think many people are using releases older than v0.18, and those who
> are probably want to upgrade to the latest stable release (v1.0). To upgrade
> to eg 0.23 they can still upgrade to v1.0 first and then upgrade again from
> there.
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