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Reversion Safety tools for overseer and subsystems (#3104)

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* guide: reversion safety

* guide: manage reversion safety in subsystems

* add leaf status to ActivatedLeaf

* add an LRU-cache to overseer for staleness detection

* update ActivatedLeaf usages in tests to contain status field

* add variant where missed accidentally

* add some helpers to LeafStatus

* address grumbles
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Robert Habermeier authored and GitHub committed 2021-05-31 20:54:05 +02:00
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polkadot/roadmap/implementers-guide/src/node/backing/candidate-backing.md
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@@ -32,7 +32,7 @@ The subsystem should maintain a set of handles to Candidate Backing Jobs that ar
### On Overseer Signal
* If the signal is an [`OverseerSignal`][OverseerSignal]`::ActiveLeavesUpdate`:
* spawn a Candidate Backing Job for each `activated` head, storing a bidirectional channel with the Candidate Backing Job in the set of handles.
* spawn a Candidate Backing Job for each `activated` head referring to a fresh leaf, storing a bidirectional channel with the Candidate Backing Job in the set of handles.
* cease the Candidate Backing Job for each `deactivated` head, if any.
* If the signal is an [`OverseerSignal`][OverseerSignal]`::Conclude`: Forward conclude messages to all jobs, wait a small amount of time for them to join, and then exit.