It just hasn't been implemented yet. The developers are mostly working on big features, and waiting to do these small optimizations later. I'm sure there are plans to address this, but I doubt it will be soon. If you're interested, you're welcome to contribute: http://ceph.com/community/contribute/ On Thu, Aug 14, 2014 at 6:21 PM, yuelongguang <fastsync at 163.com> wrote: > hi > could you tell the reason, why 'the journal is lost, the OSD is lost'? if > journal is lost, actually it only lost part which ware not replayed. > let take a similar case as example, a osd is down for some time , its > journal is out of date(lose part of journal), but it can catch up with > other osds. why? > that example can tell that either outdated osd can get all journal from > others or 'catch up' has different theory with journal. > could you explain? > > > > thanks > > > > > > > At 2014-08-14 05:21:20, "Craig Lewis" <clewis at centraldesktop.com> wrote: > > If the journal is lost, the OSD is lost. This can be a problem if you use > 1 SSD for journals for many OSDs. > > There has been some discussion about making the OSDs able to recover from > a lost journal, but I haven't heard anything else about it. I haven't been > paying much attention to the developer mailing list though. > > > For your second question, I'd start by looking at the source code > in src/osd/ReplicatedPG.cc (for standard replication), or > src/osd/ECBackend.cc (for Erasure Coding). I'm not a Ceph developer > though, so that might not be the right place to start. > > > > On Tue, Aug 12, 2014 at 7:08 PM, yuelongguang <fastsync at 163.com> wrote: > >> hi,all >> >> 1. >> can osd start up if journal is lost and it has not been replayed? >> >> 2. >> how it catchs up latest epoch? take osd as example, where is the code? >> it better you consider journal is lost or not. >> in my mind journal only includes meta/R/W operations, does not include >> data(file data). >> >> >> thanks >> >> >> >> _______________________________________________ >> ceph-users mailing list >> ceph-users at lists.ceph.com >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> >> > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.ceph.com/pipermail/ceph-users-ceph.com/attachments/20140815/3a055b7d/attachment.htm>
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