squid: mds/quiesce: let clients keep their buffered writes for a quiesced file #57013
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
With the quiesce protocol taking a `rdlock` on the file, it also revokes the `Fb` capability, which the clients can't release until they are done flushing, and that may take up arbitrarily long, evidently, more than 10 minutes. We went for the rdlock to avoid affecting readonly clients, but given the evidence above we should not optimize for those. Ideally, we’d like to have a QUIESCE file lock mode where both rd and buffer are allowed, but as of now it seems like our best available option is to `xlock` the file which will let the writing clients keep their buffers for the duration of the quiesce. We can only afford this change for a `splitauth` config, i.e. where we drop the lock immediately after all `Fw`s are revoked Signed-off-by: Leonid Usov <leonid.usov@ibm.com> (cherry picked from commit 8ac9842) Fixes: https://tracker.ceph.com/issues/65556 Original-Issue: https://tracker.ceph.com/issues/65472 Original-PR: #56755
For every mirrored lock, the auth will message the replica to ensure the replicated lock state. When we take x/rdlock on the auth, it will ensure the LOCK_LOCK state on the replica, which has the file caps we want for quiesce: CACHE and BUFFER. It should be sufficient to only hold the quiesce local lock on the replica side. Signed-off-by: Leonid Usov <leonid.usov@ibm.com> (cherry picked from commit eac482b) Fixes: https://tracker.ceph.com/issues/65556 Original-Issue: https://tracker.ceph.com/issues/65472 Original-PR: #56755
|
jenkins test api |
|
jenkins test windows |
|
This PR is under test in https://tracker.ceph.com/issues/66101. |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Backport
Fixes: https://tracker.ceph.com/issues/65556
Original-Issue: https://tracker.ceph.com/issues/65472
Original-PR: #56755
Show available Jenkins commands
jenkins retest this pleasejenkins test classic perfjenkins test crimson perfjenkins test signedjenkins test make checkjenkins test make check arm64jenkins test submodulesjenkins test dashboardjenkins test dashboard cephadmjenkins test apijenkins test docsjenkins render docsjenkins test ceph-volume alljenkins test ceph-volume toxjenkins test windowsjenkins test rook e2e