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From "Henry Robinson (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2834) ByteBuffer-based read API for DFSClient
Date Tue, 24 Jan 2012 19:36:40 GMT
ByteBuffer-based read API for DFSClient
---------------------------------------

                 Key: HDFS-2834
                 URL: https://issues.apache.org/jira/browse/HDFS-2834
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Henry Robinson
            Assignee: Henry Robinson


The {{DFSClient}} read-path always copies bytes into a JVM-allocated {{byte[]}}. Although
for many clients this is desired behaviour, in certain situations, such as native-reads through
libhdfs, this imposes an extra copy penalty since the {{byte[]}} needs to be copied out again
into a natively readable memory area. 

For these cases, it would be preferable to allow the client to supply its own buffer, wrapped
in a {{ByteBuffer}}, to avoid that final copy overhead. 

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