On Thu, Jul 3, 2014 at 8:24 AM, baijiaruo at 126.com <baijiaruo at 126.com> wrote: > when I see the function "OSD::OpWQ::_process ". I find pg lock locks the > whole function. so when I use multi-thread write the same object , so are > they must > serialize from osd handle thread to journal write thread ? It's serialized while processing the write, but that doesn't include the wait time for the data to be placed on disk ? merely sequencing it and feeding it into the journal queue. Writes have to be ordered, so that's not likely to change. -Greg Software Engineer #42 @ http://inktank.com | http://ceph.com
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