nomad: revert use of SnapshotAfter in planApply #5773
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Revert plan_apply.go changes from #5411 Since non-Command Raft messages do not update the StateStore index, SnapshotAfter may unnecessarily block and needlessly fail in idle clusters where the last Raft message is a non-Command message. This is trivially reproducible with the dev agent and a job that has 2 tasks, 1 of which fails. The correct logic would be to SnapshotAfter the previous plan's index to ensure consistency. New clusters or newly elected leaders will not have a previous plan, so the index the leader was elected should be used instead.
notnoop
approved these changes
Jun 4, 2019
preetapan
approved these changes
Jun 4, 2019
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Revert plan_apply.go changes from #5411
Since non-Command Raft messages do not update the StateStore index,
SnapshotAfter may unnecessarily block and needlessly fail in idle
clusters where the last Raft message is a non-Command message.
This is trivially reproducible with the dev agent and a job that has 2
tasks, 1 of which fails.
The correct logic would be to SnapshotAfter the previous plan's index to
ensure consistency. New clusters or newly elected leaders will not have
a previous plan, so the index the leader was elected should be used
instead.