namenode format should not create stroage dir if it's doesn't exist
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Key: HDFS-3095
URL: https://issues.apache.org/jira/browse/HDFS-3095
Project: Hadoop HDFS
Issue Type: Bug
Components: name-node
Affects Versions: 0.24.0
Reporter: Brandon Li
Assignee: Brandon Li
The storage directory can be a mount point.
Automatically creating the mount point could be problematic.
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