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https://issues.apache.org/jira/browse/HADOOP-3573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12614833#action_12614833
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Raghu Angadi commented on HADOOP-3573:
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Ok, what you are saying is that we need not support the extra code we have for
more precise messages when user runs 0.12 etc. Then we can remove some of the
code.
So essentially 2 situations I gave above need not be handled the same way
between current and older Hadoops.
> Remove code related to conversion of name-node and data-node storage
> directories to the format introduced in hadoop 0.13
> ------------------------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-3573
> URL: https://issues.apache.org/jira/browse/HADOOP-3573
> Project: Hadoop Core
> Issue Type: Improvement
> Components: dfs
> Affects Versions: 0.17.0
> Reporter: Konstantin Shvachko
> Assignee: Raghu Angadi
> Fix For: 0.19.0
>
>
> Hadoop 0.18 does not support direct HDFS upgrades from versions 0.13 or
> earlier as stated in HADOOP-2797.
> A 2 step upgrade is required in this case first from 0.x <= 0.13 to one of
> version 0.14 through 0.17 and then to 0.18.
> This implies that current hdfs does not need to support code related to
> conversions of the old (pre 0.13) storage layout to the current one
> introduced in 0.13 (see. HADOOP-702).
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