SecondaryNameNode should not discard "previous.checkpoint"
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Key: HDFS-1839
URL: https://issues.apache.org/jira/browse/HDFS-1839
Project: Hadoop HDFS
Issue Type: Bug
Components: name-node
Affects Versions: 0.20.1
Reporter: Konstantin Shvachko
Fix For: 0.22.0
While creating a checkpoint SNN calls {{moveLastCheckpoint()}} twice. As a
result directory "previous.checkpoint" is getting removed.
"previous.checkpoint" directory holds the checkpoint that was created before
the current one. It is useful for manual recovery, but nothing else.
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