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parachains runtime: configurable maximum validators per core (#2043)

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* parachains runtime: configurable maximum validators per core

* update guide and add test
This commit is contained in:
Robert Habermeier
2020-11-30 15:18:02 -05:00
committed by GitHub
parent 8081c54428
commit 0f4395fc44
4 changed files with 94 additions and 4 deletions
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polkadot/roadmap/implementers-guide/src/runtime/scheduler.md
+3 -2
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@@ -175,11 +175,12 @@ Actions:
1. Set `SessionStartBlock` to current block number.
1. Clear all `Some` members of `AvailabilityCores`. Return all parathread claims to queue with retries un-incremented.
1. Set `configuration = Configuration::configuration()` (see [`HostConfiguration`](../types/runtime.md#host-configuration))
1. Resize `AvailabilityCores` to have length `Paras::parachains().len() + configuration.parathread_cores with all`None` entries.
1. Resize `AvailabilityCores` to have length `Paras::parachains().len() + configuration.parathread_cores with all `None` entries.
1. Compute new validator groups by shuffling using a secure randomness beacon
- We need a total of `N = Paras::parachains().len() + configuration.parathread_cores` validator groups.
- The total number of validators `V` in the `SessionChangeNotification`'s `validators` may not be evenly divided by `V`.
- First, we obtain "shuffled validators" `SV` by shuffling the validators using the `SessionChangeNotification`'s random seed.
- Then, we truncate `SV` to have at most `configuration.max_validators_per_core * N` members, if `configuration.max_validators_per_core` is `Some`.
- Note that the total number of validators `V` in `SV` may not be evenly divided by `N`.
- The groups are selected by partitioning `SV`. The first V % N groups will have (V / N) + 1 members, while the remaining groups will have (V / N) members each.
1. Prune the parathread queue to remove all retries beyond `configuration.parathread_retries`.
- Also prune all parathread claims corresponding to de-registered parathreads.