when dfs.name.dir and dfs.name.edits.dir are same fsimage will be saved twice
every time
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Key: HDFS-1910
URL: https://issues.apache.org/jira/browse/HDFS-1910
Project: Hadoop HDFS
Issue Type: Bug
Components: name-node
Affects Versions: 0.21.0
Reporter: Gokul
Priority: Minor
when image and edits dir are configured same, the fsimage flushing from memory
to disk will be done twice whenever saveNamespace is done. this may impact the
performance of backupnode/snn where it does a saveNamespace during every
checkpointing time.
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