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Per HADOOP-8422 let's backport the new FileSystem methods from HADOOP-8014 to branch-1 so users can transition over in Hadoop 1.x releases, which helps upstream projects like HBase work against federation (see HBASE-6067).
Pig does not work with ViewFileSystem
Deprecate FileSystem#getDefault* and getServerDefault methods that don't take a Path argument
ViewFileSystem does not correctly implement getDefaultBlockSize, getDefaultReplication, getContentSummary