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Provide a positioned ByteBuffer-based read, that is particularly useful for HBase which does a lot of preads
Backport HDFS-8901 Use ByteBuffer in DFSInputStream#read to branch2.9
hdfsOpenFile on HDFS causes unnecessary IO from file offset 0
Use ByteBuffer pread instead of byte pread in HFileBlock when applicable
pRead equivalent for direct read path
Read HFile's block to ByteBuffer directly instead of to byte for reducing young gc purpose
GitHub Pull Request #1046