On Dec 19, 2013, Gregory Farnum <greg@xxxxxxxxxxx> wrote: > On Wed, Dec 18, 2013 at 11:32 PM, Alexandre Oliva <oliva@xxxxxxx> wrote: >> On Dec 18, 2013, Gregory Farnum <greg@xxxxxxxxxxx> wrote: >> >>> On Tue, Dec 17, 2013 at 3:36 AM, Alexandre Oliva <oliva@xxxxxxx> wrote: >>>> Here's an updated version of the patch, that makes it much faster than >>>> the earlier version, particularly when the gap between the latest osdmap >>>> known by the osd and the earliest osdmap known by the cluster is large. >> >>> Is this actually still necessary in the latest dumpling and emperor >>> branches? >> >> I can't tell for sure, I don't recall when I last rolled back to an old >> snapshot without this kind of patch. >> >>> I thought sufficiently-old OSDs would go through backfill with the new >>> PG members in order to get up-to-date without copying all the data. >> >> That much is true, for sure. The problem was getting to that point. >> >> If the latest osdmap known by the osd snapshot turns out to be older >> than the earliest map known by the monitors, the osd would give up >> because it couldn't make the ends meet: no incremental osdmaps were >> available in the cluster, and the osd refused to jump over gaps in the >> osdmap sequence. >> I can give a try without the patch if you tell me there's any chance the >> osd might now be able to jump over gaps in the osdmap sequence. > I don't remember exactly when it got changed, but I think so. Excellent, I've just confirmed that recovery from an old snapshot works, even without the proposed patch. Yay! Thanks! -- Alexandre Oliva, freedom fighter http://FSFLA.org/~lxoliva/ You must be the change you wish to see in the world. -- Gandhi Be Free! -- http://FSFLA.org/ FSF Latin America board member Free Software Evangelist Red Hat Brazil Compiler Engineer -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
