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implementers-guide: more structure for overview pages, clarify some definitions (#1682)

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Ximin Luo
2020-09-04 16:44:14 +01:00
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polkadot/roadmap/implementers-guide/src/runtime/scheduler.md
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@@ -82,7 +82,7 @@ digraph {
## Validator Groups
Validator group assignments do not need to change very quickly. The security benefits of fast rotation are redundant with the challenge mechanism in the [Approval process](../approval.md). Because of this, we only divide validators into groups at the beginning of the session and do not shuffle membership during the session. However, we do take steps to ensure that no particular validator group has dominance over a single parachain or parathread-multiplexer for an entire session to provide better guarantees of liveness.
Validator group assignments do not need to change very quickly. The security benefits of fast rotation are redundant with the challenge mechanism in the [Approval process](../protocol-approval.md). Because of this, we only divide validators into groups at the beginning of the session and do not shuffle membership during the session. However, we do take steps to ensure that no particular validator group has dominance over a single parachain or parathread-multiplexer for an entire session to provide better guarantees of liveness.
Validator groups rotate across availability cores in a round-robin fashion, with rotation occurring at fixed intervals. The i'th group will be assigned to the `(i+k)%n`'th core at any point in time, where `k` is the number of rotations that have occurred in the session, and `n` is the number of cores. This makes upcoming rotations within the same session predictable.