Hi, May I assume this fix will be in Hammer? So can I use this to fix my cluster after upgrading Giant to Hammer? Best regards, Mate On 12:34 Tue 10 Mar , Sage Weil wrote: > This is a bugfix release for firefly. It fixes a performance regression > in librbd, an important CRUSH misbehavior (see below), and several RGW > bugs. We have also backported support for flock/fcntl locks to ceph-fuse > and libcephfs. > > We recommend that all Firefly users upgrade. > > For more detailed information, see > http://docs.ceph.com/docs/master/_downloads/v0.80.9.txt > > Adjusting CRUSH maps > -------------------- > > * This point release fixes several issues with CRUSH that trigger > excessive data migration when adjusting OSD weights. These are most > obvious when a very small weight change (e.g., a change from 0 to > .01) triggers a large amount of movement, but the same set of bugs > can also lead to excessive (though less noticeable) movement in > other cases. > > However, because the bug may already have affected your cluster, > fixing it may trigger movement *back* to the more correct location. > For this reason, you must manually opt-in to the fixed behavior. > > In order to set the new tunable to correct the behavior:: > > ceph osd crush set-tunable straw_calc_version 1 > > Note that this change will have no immediate effect. However, from > this point forward, any 'straw' bucket in your CRUSH map that is > adjusted will get non-buggy internal weights, and that transition > may trigger some rebalancing. > > You can estimate how much rebalancing will eventually be necessary > on your cluster with:: > > ceph osd getcrushmap -o /tmp/cm > crushtool -i /tmp/cm --num-rep 3 --test --show-mappings > /tmp/a 2>&1 > crushtool -i /tmp/cm --set-straw-calc-version 1 -o /tmp/cm2 > crushtool -i /tmp/cm2 --reweight -o /tmp/cm2 > crushtool -i /tmp/cm2 --num-rep 3 --test --show-mappings > /tmp/b 2>&1 > wc -l /tmp/a # num total mappings > diff -u /tmp/a /tmp/b | grep -c ^+ # num changed mappings > > Divide the total number of lines in /tmp/a with the number of lines > changed. We've found that most clusters are under 10%. > > You can force all of this rebalancing to happen at once with:: > > ceph osd crush reweight-all > > Otherwise, it will happen at some unknown point in the future when > CRUSH weights are next adjusted. > > Notable Changes > --------------- > > * ceph-fuse: flock, fcntl lock support (Yan, Zheng, Greg Farnum) > * crush: fix straw bucket weight calculation, add straw_calc_version > tunable (#10095 Sage Weil) > * crush: fix tree bucket (Rongzu Zhu) > * crush: fix underflow of tree weights (Loic Dachary, Sage Weil) > * crushtool: add --reweight (Sage Weil) > * librbd: complete pending operations before losing image (#10299 Jason > Dillaman) > * librbd: fix read caching performance regression (#9854 Jason Dillaman) > * librbd: gracefully handle deleted/renamed pools (#10270 Jason Dillaman) > * mon: fix dump of chooseleaf_vary_r tunable (Sage Weil) > * osd: fix PG ref leak in snaptrimmer on peering (#10421 Kefu Chai) > * osd: handle no-op write with snapshot (#10262 Sage Weil) > * radosgw-admin: create subuser when creating user (#10103 Yehuda Sadeh) > * rgw: change multipart uplaod id magic (#10271 Georgio Dimitrakakis, > Yehuda Sadeh) > * rgw: don't overwrite bucket/object owner when setting ACLs (#10978 > Yehuda Sadeh) > * rgw: enable IPv6 for embedded civetweb (#10965 Yehuda Sadeh) > * rgw: fix partial swift GET (#10553 Yehuda Sadeh) > * rgw: fix quota disable (#9907 Dong Lei) > * rgw: index swift keys appropriately (#10471 Hemant Burman, Yehuda Sadeh) > * rgw: make setattrs update bucket index (#5595 Yehuda Sadeh) > * rgw: pass civetweb configurables (#10907 Yehuda Sadeh) > * rgw: remove swift user manifest (DLO) hash calculation (#9973 Yehuda > Sadeh) > * rgw: return correct len for 0-len objects (#9877 Yehuda Sadeh) > * rgw: S3 object copy content-type fix (#9478 Yehuda Sadeh) > * rgw: send ETag on S3 object copy (#9479 Yehuda Sadeh) > * rgw: send HTTP status reason explicitly in fastcgi (Yehuda Sadeh) > * rgw: set ulimit -n from sysvinit (el6) init script (#9587 Sage Weil) > * rgw: update swift subuser permission masks when authenticating (#9918 > Yehuda Sadeh) > * rgw: URL decode query params correctly (#10271 Georgio Dimitrakakis, > Yehuda Sadeh) > * rgw: use attrs when reading object attrs (#10307 Yehuda Sadeh) > * rgw: use \r\n for http headers (#9254 Benedikt Fraunhofer, Yehuda Sadeh) > > Getting Ceph > ------------ > > * Git at git://github.com/ceph/ceph.git > * Tarball at http://ceph.com/download/ceph-0.80.9.tar.gz > * For packages, see http://ceph.com/docs/master/install/get-packages > * For ceph-deploy, see http://ceph.com/docs/master/install/install-ceph-deploy > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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