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https://issues.apache.org/jira/browse/HDFS-293?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Allen Wittenauer resolved HDFS-293.
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Resolution: Won't Fix
Anyone still using 0.13 and earlier is probably living in a cave.
> Remove code related to conversion of name-node and data-node storage
> directories to the format introduced in hadoop 0.13
> ------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-293
> URL: https://issues.apache.org/jira/browse/HDFS-293
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Konstantin Shvachko
> Assignee: Raghu Angadi
>
> 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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