saveFSImage() should remove files from a storage directory that do not
correspond to its type.
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Key: HADOOP-4404
URL: https://issues.apache.org/jira/browse/HADOOP-4404
Project: Hadoop Core
Issue Type: Improvement
Components: dfs
Affects Versions: 0.19.0
Reporter: Konstantin Shvachko
Priority: Blocker
Fix For: 0.19.0
NameNode's image and edits directories can be separated (HADOOP-3948).
So the name-node can have 3 types of storage directories.
And each directory should contain only those files that correspond to its type:
# combined image and edits directory: should contain {{fsimage}} and {{edits}}
# image only directory should contain only {{fsimage}}
# edits only directory should contain only {{edits}}
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