ceph/PendingReleaseNotes

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>= 12.2.0
---------
12.2.1
------
- *RGW*
* dynamic resharding is now enabled by default, RGW will now automatically
reshard the bucket index once the index grows beyond `rgw_max_objs_per_shard`
- *CephFS*:
* Limiting MDS cache via a memory limit is now supported using the new
mds_cache_memory_limit config option (1GB by default). A cache reservation
can also be specified using mds_cache_reservation as a percentage of the
limit (5% by default). Limits by inode count are still supported using
mds_cache_size. Setting mds_cache_size to 0 (the default) disables the
inode limit.
* The maximum number of PGs per OSD before the monitor issues a
warning has been reduced from 300 to 200 PGs. 200 is still twice
the generally recommended target of 100 PGs per OSD. This limit can
be adjusted via the ``mon_max_pg_per_osd`` option on the
monitors. The older ``mon_pg_warn_max_per_osd`` option has been removed.
* Creating pools or adjusting pg_num will now fail if the change would
make the number of PGs per OSD exceed the configured
``mon_max_pg_per_osd`` limit. The option can be adjusted if it
is really necessary to create a pool with more PGs.
* There was a bug in the PG mapping behavior of the new *upmap*
feature. If you made use of this feature (e.g., via the `ceph osd
pg-upmap-items` command), we recommend that all mappings be removed (via
the `ceph osd rm-pg-upmap-items` command) before upgrading to this
point release.