The most time consuming part of running balancer, or calc_pg_upmaps in particular, that I can think of is
the re-calculation of each pg mapping. For large clusters, that might take seconds even minutes to finish up.
I think a more ideal fix would be introducing a pg mapping cache, e.g., we don't have to re-calculate all pg mappings
if the osdmap epoch does not change, plus some methods to manipulate it the parallel way (https://github.com/ceph/ceph/pull/28373).
原始邮件
发件人：DavidZafman <dzafman@xxxxxxxxxx>
收件人：谢型果10072465;
抄送人：ceph-devel <dev@xxxxxxx>;
日 期 ：2019年12月05日 06:43
主 题 ：upmaps and balancer
Hi Xie,
Pull request https://github.com/ceph/ceph/pull/31774 includes changes to
the Balancer which I would like you to look at even though it has
already merged. During testing I also uncovered an issue which I filed
tracker https://tracker.ceph.com/issues/43124. Please have a look at
the tracker.
Thanks
David
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