v12.2.8 released版本介紹--2019_7

v12.2.8 released是一個長期支持版本。
網頁的介紹如下：
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.

后面一句是重點。
提升了deep scrub 自動修復不一致。

解決兼容問題，變通方法選項 osd distrust data digest = true 可選方法是安全的