Hdfs 9144 merge#1

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bobhansen wants to merge 50 commits intoHDFS-8707from

HDFS-9144-merge

Commits on Nov 3, 2015

Refactored NameNodeConnection
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Removed fs_ from InputStream
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Moved GetBlockInfo to NN connection
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Moved GetBlockLocations to std::function
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Added comments
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Stripped whitespace
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Renamed NameNodeConnection to NameNodeOperations
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Renamed input_stream and asio_continuation
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Renamed CreatePipeline to Connect
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Rename async_connect to async_request
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Renamed read_some to read_packet
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Renamed async_request to async_request_block
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Renamed BlockReader::request to request_block
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Moved to file_info
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Made file_info pointers const
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Refactored DataNodeConnection, etc.
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Added shared_ptr to DN_Connection
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Moved DNConnection into trait
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Trimmed whitespace
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Re-enabled IS tests
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Cleaned up some tests
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Working on less templates
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Compiles!
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Fixed DNconnection signature
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Fixed segfault in ReadData
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Removed BlockReader callback templates
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Removed last templates from BlockReader
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Moved entirely over to BlockReader w/out templates
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Removed unnecessary impls
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Moved DN to its own file
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Moved AsyncReadBlock to blockreader
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Renamed RemoteBlockReader to BlockReaderImpl
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Make AsyncStream match asio stream reqs
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Removed stream continuations
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Re-played int change
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Made IS.PRead concurrent
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Moved C lib to talk to FS
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Renamed InputStream to FileHandle
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Moved InputStream.cc to FileHandle.cc
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Removed whitespace
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Rolled back pom.xml changes
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Commits on Nov 4, 2015

Added cancel
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Move FileHandle into its own module
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Added missing files
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Roll back pom file
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Some code cleanup
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Cleared whitespace
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Added docs to blockreader
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Commits on Nov 6, 2015

Fixed virtual method calls in FileSystem
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Retain reader through last callback
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