Potential endless wait loop in `BalancerManager.wait_for_task`

[imanenami]

The wait_for_task code in the balancer manager has the potential to enter the charm into an endless wait loop. This has popped up on occasions in the balancer-single integration tests.

Steps to reproduce

Basically run the test_balancer in single mode.

Expected behavior

The charm should avoid waiting forever for a task.

Actual behavior

Charm stuck in awaiting completion of rebalance task

Versions

Operating system: Ubuntu 24.04.2 LTS

Juju CLI: 3.6.11-genericlinux-amd64

Juju agent: 3.6.11

Charm revision: any revision <=239

LXD: 5.21.4 LTS

[syncronize-issues-to-jira]

Thank you for reporting your feedback to us!

The internal ticket has been created: https://warthogs.atlassian.net/browse/DPE-8925.

This message was autogenerated

[imanenami]

Right now, the workaround is to manually call the /kafkacruisecontrol/stop_proposal_execution endpoint.

curl -X POST -u balancer:{balancer_password} localhost:9090/kafkacruisecontrol/stop_proposal_execution?reason=timeout