worker/lease fix the handling of multiple concurrent errors #9730
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The blocked ClaimLeadership API request might explain the API server blocking when trying to restart in https://bugs.launchpad.net/juju/+bug/1813261 I'm not sure what the underlying error is - a timeout won't kill the manager. Once this fix is landed we'll potentially be able to see the manager crashing for some other reason. |
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Feb 13, 2019
#9748 ## Description of change This just brings develop up-to-date with all the 2.5 patches: prdesc Merge pull request #9745 from jameinel/2.5-lease-invalid-retries-1815719 prdesc Merge pull request #9740 from wallyworld/cmr-multi-offer-fix prdesc Merge pull request #9742 from jameinel/2.5-worker-lease-1815468 prdesc Merge pull request #9736 from jameinel/2.5-leadership-client prdesc Merge pull request #9737 from jameinel/2.5-worker-lease-1815468 prdesc Merge pull request #9722 from achilleasa/fix-1812227 prdesc Merge pull request #9734 from babbageclunk/state-worker-dep-message prdesc Merge pull request #9733 from babbageclunk/raftlease-stop-global-clock prdesc Merge pull request #9735 from howbazaar/2.5-mongo-systemd-ulimit prdesc Merge pull request #9724 from babbageclunk/raftlease-upgrade-blank prdesc Merge pull request #9731 from howbazaar/2.5-status-close-error prdesc Merge pull request #9730 from howbazaar/2.5-lease-race prdesc Merge pull request #9727 from achilleasa/fix-1814638 prdesc Merge pull request #9728 from wallyworld/rename-delete-storage-pool prdesc Merge pull request #9712 from jameinel/2.5-leases-nextTick prdesc Merge pull request #9709 from jameinel/2.5-update-testing-clock ## QA steps See individual patches. ## Documentation changes See individual patches. ## Bug reference prdesc https://bugs.launchpad.net/juju/+bug/1815719 prdesc https://bugs.launchpad.net/juju/+bug/1813151 prdesc https://bugs.launchpad.net/juju/+bug/1815179 prdesc https://bugs.launchpad.net/juju/+bug/1815471 prdesc https://bugs.launchpad.net/juju/+bug/1815468 prdesc https://bugs.launchpad.net/juju/+bug/1812227 prdesc https://bugs.launchpad.net/juju/+bug/1815405 prdesc https://bugs.launchpad.net/juju/+bug/1813996 prdesc https://bugs.launchpad.net/juju/+bug/1813995 prdesc https://bugs.launchpad.net/juju/+bug/1815397 prdesc https://bugs.launchpad.net/juju/+bug/1814638 prdesc https://bugs.launchpad.net/juju/+bug/1814556
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This fix is for the observed failures we have seen in openstack deploys with solutions QA.
The uniter worker would get stuck setting up the initial remote state watcher. This watcher would try to claim the leadership, and the ClaimLeadership facade call would never return.
On the apiserver, the worker/lease was in a state where it was trying to restart, but waiting on the in flight wait group. If there were two concurrent claims, both of which hit errors, the first would be processed causing the worker/lease loop to exit. This triggered a defer on the wait group, which wasn't being decremented until the second in flight claim finished. However the second in flight one was blocked trying to send the error down the errors channel. This was no longer being selected on.
The fix is to not use an errors channel, but instead just kill the catacomb.
Bug reference
https://bugs.launchpad.net/juju/+bug/1815397