We're happy to announce the 1st backport release in the Reef series.
This is the first backport release in the Reef series, and the first
with Debian packages, for Debian Bookworm.
We recommend all users update to this release.
https://ceph.io/en/news/blog/2023/v18-2-1-reef-released/
Notable Changes
---------------
* RGW: S3 multipart uploads using Server-Side Encryption now replicate
correctly in
multi-site. Previously, the replicas of such objects were corrupted
on decryption.
A new tool, ``radosgw-admin bucket resync encrypted multipart``, can
be used to
identify these original multipart uploads. The ``LastModified``
timestamp of any
identified object is incremented by 1ns to cause peer zones to
replicate it again.
For multi-site deployments that make any use of Server-Side Encryption, we
recommended running this command against every bucket in every zone after all
zones have upgraded.
* CEPHFS: MDS evicts clients which are not advancing their request
tids which causes
a large buildup of session metadata resulting in the MDS going
read-only due to
the RADOS operation exceeding the size threshold.
`mds_session_metadata_threshold`
config controls the maximum size that a (encoded) session metadata can grow.
* RGW: New tools have been added to radosgw-admin for identifying and
correcting issues with versioned bucket indexes. Historical bugs with the
versioned bucket index transaction workflow made it possible for the index
to accumulate extraneous "book-keeping" olh entries and plain placeholder
entries. In some specific scenarios where clients made concurrent requests
referencing the same object key, it was likely that a lot of extra index
entries would accumulate. When a significant number of these entries are
present in a single bucket index shard, they can cause high bucket listing
latencies and lifecycle processing failures. To check whether a versioned
bucket has unnecessary olh entries, users can now run ``radosgw-admin
bucket check olh``. If the ``--fix`` flag is used, the extra entries will
be safely removed. A distinct issue from the one described thus far, it is
also possible that some versioned buckets are maintaining extra unlinked
objects that are not listable from the S3/ Swift APIs. These extra objects
are typically a result of PUT requests that exited abnormally, in the middle
of a bucket index transaction - so the client would not have received a
successful response. Bugs in prior releases made these unlinked objects easy
to reproduce with any PUT request that was made on a bucket that was actively
resharding. Besides the extra space that these hidden, unlinked objects
consume, there can be another side effect in certain scenarios, caused by
the nature of the failure mode that produced them, where a client of a bucket
that was a victim of this bug may find the object associated with
the key to7fe91d5d5842e04be3b4f514d6dd990c54b29c76
be in an inconsistent state. To check whether a versioned bucket has unlinked
entries, users can now run ``radosgw-admin bucket check unlinked``. If the
``--fix`` flag is used, the unlinked objects will be safely removed. Finally,
a third issue made it possible for versioned bucket index stats to be
accounted inaccurately. The tooling for recalculating versioned bucket stats
also had a bug, and was not previously capable of fixing these inaccuracies.
This release resolves those issues and users can now expect that the existing
``radosgw-admin bucket check`` command will produce correct results. We
recommend that users with versioned buckets, especially those that existed
on prior releases, use these new tools to check whether their buckets are
affected and to clean them up accordingly.
* mgr/snap-schedule: For clusters with multiple CephFS file systems, all the
snap-schedule commands now expect the '--fs' argument.
* RADOS: A POOL_APP_NOT_ENABLED health warning will now be reported if
the application is not enabled for the pool irrespective of whether
the pool is in use or not. Always add ``application`` label to a pool
to avoid reporting of POOL_APP_NOT_ENABLED health warning for that pool.
The user might temporarilty mute this warning using
``ceph health mute POOL_APP_NOT_ENABLED``.
Getting Ceph
------------
* Git at git://github.com/ceph/ceph.git
* Tarball at https://download.ceph.com/tarballs/ceph-18.2.1.tar.gz
* Containers at https://quay.io/repository/ceph/ceph
* For packages, see https://docs.ceph.com/en/latest/install/get-packages/
* Release git sha1: 7fe91d5d5842e04be3b4f514d6dd990c54b29c76
