Cleanup FSImage construction
----------------------------
Key: HDFS-1725
URL: https://issues.apache.org/jira/browse/HDFS-1725
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Ivan Kelly
Assignee: Ivan Kelly
Fix For: 0.23.0
FSImage construction is messy. Sometimes the storagedirectories in use are set
straight away, sometimes they are not. This makes it hard for anything under
FSImage (i.e. FSEditLog) to make assumptions about what it can use. Therefore,
this patch makes FSImage set the storage directories in use during
construction, and never allows them to change. If you want to change
storagedirectories you create a new image.
Also, all the construction code should be the same with the only difference
being the parameters passed. When not passed, these should get sensible
defaults.
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