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https://issues.apache.org/jira/browse/HADOOP-3573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12614592#action_12614592
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Konstantin Shvachko commented on HADOOP-3573:
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I think there is no need to support this code or the corrupt image directory.
# Current version started on 0.12 image will say "unformatted or OLD version".
# 0.12 version started on current image will say unformatted and will not
corrupt it.
> 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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