As nautilus is nearing its EOL we are planning to do a next (maybe the
last) point release - nautilus 14.2.22 in the first part of June 2021.
If you have any code changes that are to be included pls raise PRs and
add labels "nautilus -batch1" and "needs-qa", so they can be tested
and merged in time for 14.2.22.
Thx
YuriW
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Hi Folks,
The performance meeting will be starting in about 15 minutes! Today we
have a couple of different topics ranging from issues with tcmalloc and
memory target values not being properly set by ceph-adm and
ceph-ansible, to RGW CPU utilization and cache behavior.
Hope to see you there!
Etherpad:
https://pad.ceph.com/p/performance_weekly
Bluejeans:
https://bluejeans.com/908675367
Mark
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Hey all, we were doing some testing of ceph against our product and we
found some behavior we want to run by you.
We are using the S3 ceph interface.
Attached is a python file using boto3 which, when run against two
different deployments of ceph (octopus ceph nano and our production
nautilus 14.2.11 deployment), appears to repro a strange issue.
After running for a while, a recently uploaded file forever disappears from
list_objects requests. This file still appears to be visible to get_object
if you know the specific name, but does not show up in list_objects.
There are more details about the experiment in the attached python file.
We produced a run of this experiment with debug logging, in which we see a
trace message
RGWRados::cls_bucket_list_ordered: skipping <filename>
In the same millisecond that the file was PUT.
Reading the code, this comes from when a call to check_disk_state returns
ENOENT, where we see
if (!list_state.is_delete_marker() && !astate->exists) {
/* object doesn't exist right now -- hopefully because it's
* marked as !exists and got deleted */
if (list_state.exists) {
/* FIXME: what should happen now? Work out if there are any
* non-bad ways this could happen (there probably are, but annoying
* to handle!) */
}
// encode a suggested removal of that key
list_state.ver.epoch = io_ctx.get_last_version();
list_state.ver.pool = io_ctx.get_id();
cls_rgw_encode_suggestion(CEPH_RGW_REMOVE, list_state,
suggested_updates);
return -ENOENT;
}
It seems like this might be some kind of race between PUT and list_object
in which some kind of object metadata is apparently deleted... the FIXME is
at least a little suspicious :).
I would love to know what's going on here, and if there is a fix or
workaround we can do to prevent this behavior. Let me know if there is any
other information we can provide.
Thank you so much!
Best,
-Joseph Victor
Hi,
With Pacific (16.2.0) out of the door we have the RBD persistent
WriteBack cache for RBD:
https://docs.ceph.com/en/latest/rbd/rbd-persistent-write-back-cache/
Has anybody performed some benchmarks with the RBD cache?
Interested in the QD=1 bs=4k performance mainly.
I don't have any proper hardware available to run benchmarks on yet.
Wido
I'm happy to announce another release of the go-ceph API
bindings. This is a regular release following our every-two-months release
cadence.
https://github.com/ceph/go-ceph/releases/tag/v0.10.0
Changes in the release are detailed in the link above.
The bindings aim to play a similar role to the "pybind" python bindings in the
ceph tree but for the Go language. These API bindings require the use of cgo.
There are already a few consumers of this library in the wild, including the
ceph-csi project.
In addition to our regular release this week, we're also participating in this
June's "Ceph Month" event with the "go-ceph get together" Birds-of-a-Feather
session on Thursday June 10th at 10:10 Eastern time. It should be visible in
the Ceph Community calendar [1]. If you can't make the BoF, questions,
comments, bugs etc are best directed at our github issues
tracker or github discussions forum.
[1] - https://ceph.io/contribute/#community-calendar
--
John Mulligan
phlogistonjohn(a)asynchrono.us
jmulligan(a)redhat.com
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Highlights from this week:
* final nautilus release in progress
- a few more outstanding issues to be backported before final testing
* next week we'll write down a roadmap for quincy
- higher level than trello cards generated during planning sessions
- to be added to the ceph website
* new jenkins machines are up and running
- there was a compilation issue due to OOM, now fixed by [0]
- about 1 month for other new test hardware to get racked and running
* backport priority
- raised in ceph month discussion - some backports of significant
- seems backport tracker issues aren't inheriting the original issue
priority
- should add this to the backport-create-issue script
Josh
[0] https://github.com/ceph/ceph/pull/41677