BufferedPositionedInputStream isn't buffered

                 Key: PIG-599
                 URL: https://issues.apache.org/jira/browse/PIG-599
             Project: Pig
          Issue Type: Bug
          Components: impl
    Affects Versions: types_branch
            Reporter: Alan Gates
            Assignee: Alan Gates
             Fix For: types_branch

org.apache.pig.impl.io.BufferedPositionedInputStream is not actually buffered.  
This is because it sits atop a FSDataInputStream (somewhere down the stack), 
which is buffered.  So to avoid double buffering, which can be bad, 
BufferedPositionedInputStream was written without buffering.  But the 
FSDataInputStream is far enough down the stack that it is still quite costly to 
call read() individually for each byte.  A run through a profiler shows that a 
fair amount of time is being spent in BufferedPositionedInputStream.read().

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