delay instantiation of file system object until it is needed (linked to
HADOOP-7207)
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Key: HDFS-1824
URL: https://issues.apache.org/jira/browse/HDFS-1824
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Boris Shkolnik
Assignee: Boris Shkolnik
also re-factor the code little bit to avoid checking for instance of DFS in
multiple places.
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