nomad: compare current eval when setting WaitIndex #5381
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Consider currently dequeued Evaluation's ModifyIndex when determining its WaitIndex. Normally the Evaluation itself would already be in the state store snapshot used to determine the WaitIndex. However, since the FSM applies Raft messages to the state store concurrently with Dequeueing, it's possible the currently dequeued Evaluation won't yet exist in the state store snapshot used by JobsForEval. This can be solved by always considering the current eval's modify index and using it if it is greater than all of the evals returned by the state store.
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Co-Authored-By: schmichael <[email protected]>
Co-Authored-By: schmichael <[email protected]>
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docs: add #5381 to changelog
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I'm going to lock this pull request because it has been closed for 120 days ⏳. This helps our maintainers find and focus on the active contributions. |
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Consider currently dequeued Evaluation's ModifyIndex when determining
its WaitIndex. Normally the Evaluation itself would already be in the
state store snapshot used to determine the WaitIndex. However, since the FSM
applies Raft messages to the state store concurrently with Dequeueing,
it's possible the currently dequeued Evaluation won't yet exist in the
state store snapshot used by JobsForEval.
This can be solved by always considering the current eval's modify index
and using it if it is greater than all of the evals returned by the
state store.
(My comments to code ratio is out of control in this PR, but it's so subtle and I'm fairly new to the server-side. Please bear with me. 😄 )