Remove code related to conversion of name-node and data-node storage
directories to the format introduced in hadoop 0.13
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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
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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