Admin command saveNamespace.
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Key: HADOOP-4826
URL: https://issues.apache.org/jira/browse/HADOOP-4826
Project: Hadoop Core
Issue Type: New Feature
Components: dfs
Reporter: Konstantin Shvachko
Assignee: Konstantin Shvachko
Fix For: 0.20.0
It would be useful to have an admin command that saves current namespace.
This command can be used before regular (planned) cluster shutdown.
The command will save the namespace into storage directory(s) and reset the
name-node journal (edits file).
It will also reduce name-node startup time, because edits do not need to be
digest.
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