[GitHub] [jclouds] dordoriko opened a new pull request #26: JCLOUDS-847: Poor upload performance for putBlob

[GitBox <gi...@apache.org>]

dordoriko opened a new pull request #26: JCLOUDS-847: Poor upload performance for putBlob
URL: https://github.com/apache/jclouds/pull/26
 
 
   This change improves the performance of writing to sockets with the
   default Java URL connection HTTP client, by enlarging the buffer used
   for socket writes from an implicit hard-coded 4KB / 8KB buffer to a
   configurable 32KB buffer.
   
   The buffer size is now controlled by the following property with the
   following default value:
   
   jclouds.output-socket-buffer-size: 32768
   
   The implementation is based on a variant of ByteStreams.copy (written as
   ByteStreams2.copy) which accepts the buffer size as an argument, unlike
   the original Guava code that uses a hard-coded size.
   
   The change was done directly within the loop that copies the input
   stream to the output stream, and not by wrapping a BufferedOutputStream
   around the existing output stream, in order to avoid copying the payload
   twice.
   
   On some platforms this change can improve both the putBlob throughput
   and the total CPU consumption.

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