Canonical Juju

Migrating model fails due to missing unit for leader, however such application doesn't exist in model anymore

Bug #2004151 reported by Diko Parvanov
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Canonical Juju
Triaged
Medium
Unassigned

Bug Description

Migrating model from 2.9.37 controller to a new 2.9.38 fails with:

machine-0: 10:48:08 INFO juju.worker.migrationmaster.55ab2e aborted, removing model from target controller: model data transfer failed, model export failed: missing unit for leader "nrpe-lxd/18" not valid (not valid)

However this application has been removed some time ago

juju show-application nrpe-lxd
{}
ERROR application "nrpe-lxd" not found

Juju shouldn't block migrations on missing leaders for applications that do not exist anymore.

Revision history for this message
Diko Parvanov (dparv) wrote :

Worked around this by using https://bugs.launchpad.net/juju/+bug/1890072

juju_revoke_lease -m 55ab2ebd-6e66-4d23-8549-aee9f03fae13 -l nrpe-lxd

Heather Lanigan (hmlanigan)
Changed in juju:
importance: Undecided → High
Revision history for this message
Heather Lanigan (hmlanigan) wrote :

Without knowing some history of the model and application, it's difficult to find why the leader wasn't removed.

I've been trying simple reproducers without success.

Changed in juju:
importance: High → Medium
status: New → Triaged
Revision history for this message
Joseph Phillips (manadart) wrote :

The only way I can think of this happening is if that unit was on a machine undergoing a series upgrade, whereupon in was pinned as the leader.

If such a machine gets destroyed without completing the upgrade, and the unit goes with it, we never unpin it as leader.

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