Bug 1930226 - The etcdInsufficientMembers alert fires incorrectly when any instance is down and not when quorum is lost
Summary: The etcdInsufficientMembers alert fires incorrectly when any instance is down...
Keywords:
Status: CLOSED DUPLICATE of bug 1937907
Alias: None
Product: OpenShift Container Platform
Classification: Red Hat
Component: Etcd
Version: 4.7
Hardware: Unspecified
OS: Unspecified
urgent
urgent
Target Milestone: ---
: 4.6.z
Assignee: Clayton Coleman
QA Contact: ge liu
URL:
Whiteboard:
Depends On: 1929944 1930224 1930876
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-02-18 14:31 UTC by Clayton Coleman
Modified: 2021-03-11 18:02 UTC (History)
4 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of: 1930224
Environment:
Last Closed: 2021-03-11 18:02:52 UTC
Target Upstream Version:
Embargoed:


Attachments (Terms of Use)

Description Clayton Coleman 2021-02-18 14:31:04 UTC
+++ This bug was initially created as a clone of Bug #1930224 +++

+++ This bug was initially created as a clone of Bug #1929944 +++

etcdInsufficientMembers is supposed to fire when quorum is potentially lost. However, the difference in how upstream expects to configure etcd (instance label unique) and how OpenShift configures etcd (running in pods, so instance and pod label are unique) results in the alert firing spuriously during upgrades. This means the alert fires too eagerly.

The alert, once corrected, should only fire if we have reason to believe quorum is lost i.e. a majority of instances are down (must have (N+1)/2 instances up) where n is inferred from the expected number of scrape targets. The alert should have a better description and suggest possible areas to investigate, namely down control plane nodes or broken networking.

A runbook addition will come later.

Will be backported to 4.7 and 4.6

Comment 1 Sam Batschelet 2021-03-11 18:02:52 UTC

*** This bug has been marked as a duplicate of bug 1937907 ***


Note You need to log in before you can comment on or make changes to this bug.