Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Lease Checkpoints fix #13508

Merged
merged 4 commits into from
Dec 2, 2021
Merged

Lease Checkpoints fix #13508

merged 4 commits into from
Dec 2, 2021

Conversation

serathius
Copy link
Member

This is continuation of work on #13491
Main difference is that this proposes to persist remainingTTL on checkpoint making checkpoints not depend on snapshot frequency.

I also check that renew logic should not be impacted by this change. Renew already includes logic that will reset remainingTTL if needed.

@michaljasionowski @serathius
lease,integration: add checkpoint scheduling after leader change
48a360a 
Current checkpointing mechanism is buggy. New checkpoints for any lease
are scheduled only until the first leader change. Added fix for that
and a test that will check it.
@serathius serathius mentioned this pull request Nov 26, 2021
Closed
@michaljasionowski @serathius
etcdserver,integration: Store remaining TTL on checkpoint
fd77b27 
To extend lease checkpointing mechanism to cases when the whole etcd
cluster is restarted.
@serathius
Copy link
Member Author

cc @ptabor

@serathius
Copy link
Member Author

cc @jpbetz

@ptabor
Copy link
Contributor

ptabor commented Nov 29, 2021

Can this cause inconsistency of checksums of the DBs computed from diffrent instances,
i.e. checkpointing is enabled with 3.6 (or 3.5.3 backport) so version 3.5.2 would had different post-raft state in comparison to version that didn't got upgraded to 3.5.2...
We should have tests / know what are the implications of such 'mismatch',

@serathius serathius force-pushed the checkpoints-fix branch 2 times, most recently from b4cf39e to 164fa1a Compare December 1, 2021 15:10
@serathius
Copy link
Member Author

I have added a proper feature guarding to ensure that we avoid checksum inconsistency.
First we require cluster version to be at least v3.6, this way will handle upgrades as cluster version is bumped only after all members of cluster are upgraded. Second I added a flag to provide compatibility for v3.5 -> v3.6 upgrades. As we are planning to backport this fix to v3.5 this flag will be used in v3.5 to enable checkpoint persist. However for v3.6 this flag will be used to ensure consistency during upgrade as it will inform v3.6 members that cluster already has this feature enabled.

ptabor
ptabor approved these changes Dec 1, 2021
View reviewed changes
Copy link
Contributor

@ptabor ptabor left a comment

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

LGTM. Thank you.

server/etcdmain/config.go Outdated Show resolved Hide resolved
server/lease/lessor.go Outdated Show resolved Hide resolved
server/lease/lessor.go Outdated Show resolved Hide resolved
server/lease/lessor_test.go Outdated Show resolved Hide resolved
server/lease/lessor_test.go Outdated Show resolved Hide resolved
server/lease/lessor_test.go Outdated Show resolved Hide resolved
jpbetz
jpbetz reviewed Dec 1, 2021
View reviewed changes
Copy link
Contributor

@jpbetz jpbetz left a comment

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

The use of persistTo and scheduling checkpoints on promotion look right to me. Thanks for fixing. One comment about flag docs.

server/embed/config.go Outdated Show resolved Hide resolved
@serathius
server: Require either cluster version v3.6 or --experimental-enable-…
7d10899 
…lease-checkpoint-persist to persist lease remainingTTL

To avoid inconsistant behavior during cluster upgrade we are feature
gating persistance behind cluster version. This should ensure that
all cluster members are upgraded to v3.6 before changing behavior.

To allow backporting this fix to v3.5 we are also introducing flag
--experimental-enable-lease-checkpoint-persist that will allow for
smooth upgrade in v3.5 clusters with this feature enabled.
@serathius
Copy link
Member Author

Addressed all the comments, @ptabor please take another look.

@ptabor ptabor merged commit 170d9b9 into etcd-io:main Dec 2, 2021
@serathius serathius mentioned this pull request Dec 2, 2021
Merged
@ahrtr ahrtr mentioned this pull request Jun 8, 2022
Draft
@serathius serathius mentioned this pull request Jul 11, 2022
Closed
@ahrtr ahrtr mentioned this pull request Jul 19, 2022
Closed
25 tasks
@ahrtr
Copy link
Member

ahrtr commented Jul 20, 2022

@serathius Do you have bandwidth to backport this PR to 3.4? :)

@serathius serathius mentioned this pull request Jul 21, 2022
Merged
@serathius
Copy link
Member Author

Done

@serathius serathius deleted the checkpoints-fix branch June 15, 2023 20:39
@serathius serathius mentioned this pull request Dec 21, 2023
Closed
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Reviewers

@jpbetz jpbetz jpbetz left review comments

@ptabor ptabor ptabor approved these changes

Assignees
No one assigned
Labels
None yet
Milestone
No milestone
Development

Successfully merging this pull request may close these issues.

None yet
5 participants
@serathius @ptabor @ahrtr @jpbetz @michaljasionowski