Bryan Cutler created ARROW-2704:

             Summary: [Java] IPC stream handling should be more friendly to low 
level processing
                 Key: ARROW-2704
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Java - Vectors
            Reporter: Bryan Cutler
            Assignee: Bryan Cutler

With some minor adjustments, the Java IPC stream reader could be more friendly 
to allow for low level message processing.  By that I mean reading a stream and 
examining messages without necessarily having to load the Record Batch data.  
These include 

* Separate MessageChannelReader.readNextMessage to allow access to the buffer 
containing the message.
* MessageChannelReader input channel should be protected
* ArrowStreamWriter should make the message to end a stream static
* WriteChannel intToBytes could write to existing bytes or byte buffer instead 
of creating new array

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