Contributed by Steve Loughran. This moves the new API of HDFS-13616 into a interface which is implemented by HDFS RPC filesystem client (not WebHDFS or any other connector) This new interface, BatchListingOperations, is in hadoop-common, so applications do not need to be compiled with HDFS on the classpath. They must cast the FS into the interface. instanceof can probe the client for having the new interface -the patch also adds a new path capability to probe for this. The FileSystem implementation is cut; tests updated as appropriate. All new interfaces/classes/constants are marked as @unstable. Change-Id: I5623c51f2c75804f58f915dd7e60cb2cffdac681
HADOOP-16110 Upgrade to yetus 0.11.1 and use emoji vote on github pre commit (#1527). Contributed by Duo Zhang.
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