Feature #1852: librados: don't do memory copies for the C interface - RADOS - Ceph

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Feature #1852

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librados: don't do memory copies for the C interface

Added by Greg Farnum over 12 years ago. Updated almost 6 years ago.

Status:

New

Priority:

Normal

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Target version:

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Component(RADOS):

librados

Pull request ID:

Description

The current implementation of the librados C interface (well, the one I'm working on now) uses in-memory copies for anything that needs to be passed to the Objecter as a bufferlist. Right now that's required because there's no good way to prevent memory from being read by the Messenger, or to predictably bound it (the hard scenario Sage brought up is a message that gets sent to osd.1, but then to osd.2 because of a map change, and you get the safe reply from osd.2 before sending to osd.1).

This is blocked by #1851, though.