-Re: Compressor tweaks corresponding to HDFS-2834, 3051?
Robert Evans 2012-03-07, 15:16
I am a +1 on opening a new JIRA for a first stab at reducing the amount of data that gets copied around.
On 3/7/12 1:26 AM, "Tim Broberg" <[EMAIL PROTECTED]> wrote:
In https://issues.apache.org/jira/browse/HDFS-2834, Todd says, "
This is also useful whenever a native decompression codec is being used. In those cases, we generally have the following copies:
1) Socket -> DirectByteBuffer (in SocketChannel implementation)
2) DirectByteBuffer -> byte (in SocketInputStream)
3) byte -> Native buffer (set up for decompression)
4*) decompression to a different native buffer (not really a copy - decompression necessarily rewrites)
5) native buffer -> byte
with the proposed improvement we can hopefully eliminate #2,#3 for all applications, and #2,#3,and #5 for libhdfs.
It seems like we need to tweak the Decompressor (and Compressor?) classes to take DirectByteBuffer inputs / outputs rather than byte's to support this improvement.
Is the right thing to do for me to open a jira in common for this and take a first stab at defining the interface?
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