[jira] [Updated] (ARROW-2704) [Java] IPC stream handling should be more friendly to low level processing

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-2704?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated ARROW-2704:
----------------------------------
    Labels: pull-request-available  (was: )

> [Java] IPC stream handling should be more friendly to low level processing
> --------------------------------------------------------------------------
>
>                 Key: ARROW-2704
>                 URL: https://issues.apache.org/jira/browse/ARROW-2704
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Java - Vectors
>            Reporter: Bryan Cutler
>            Assignee: Bryan Cutler
>            Priority: Major
>              Labels: pull-request-available
>
> 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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