v12.2.8 released版本介绍--2019_7

v12.2.8 released是一个长期支持版本。
网页的介绍如下：
https://ceph.com/releases/v12-2-8-released/

We’re glad to announce the next point release in the Luminous v12.2.X
stable release series. This release contains a range of bugfixes and
stability improvements across all the components of ceph. We thank everyone for contributing towards this release.

Upgrade notes from previous luminous releases
When upgrading from v12.2.5 or v12.2.6 please note that upgrade caveats from
12.2.5 will apply to any _newer_ luminous version including 12.2.8. Please read
the upgrade notes on 12.2.7

For the cluster that installed the broken 12.2.6 release, 12.2.7 fixed the
regression and introduced a workaround option `osd distrust data digest = true`,
but 12.2.7 clusters still generated health warnings like ::

[ERR] 11.288 shard 207: soid
11:1155c332:::rbd_data.207dce238e1f29.0000000000000527:head data_digest 0xc8997a5b != data_digest 0x2ca15853

12.2.8 improves the deep scrub code to automatically repair these
inconsistencies. Once the entire cluster has been upgraded and then fully deep
scrubbed, and all such inconsistencies are resolved; it will be safe to disable
the `osd distrust data digest = true` workaround option.

后面一句是重点。
提升了deep scrub 自动修复不一致。

解决兼容问题，变通方法选项 osd distrust data digest = true 可选方法是安全的