SPIN secondary leader selection mechanism #288
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| 1. **Deterministic Secondary Author:** For any given slot `S`, we already have the primary author `P_primary` determined by `slot_author`. We need to define a deterministic way to find the *secondary* author, `P_secondary`, for that same slot `S`. A simple and common approach is to pick the *next* authority in the current session's round-robin order. | ||
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| * Modify `slot_author` or add a new function, e.g., `get_slot_authors(slot, session_length, authorities)` that returns `Option<(PrimaryAuthorityId, SecondaryAuthorityId)>`. |
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@khssnv: "get_slot_authors seems better to me, otherwise, why have only one secondary when we can iterate over all the validators until the list is exhausted?"
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that's just authority set as a whole then, no?
| ### Decision Drivers (Optional) | ||
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| ### Alternatives Considered |
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@khssnv: Can we consider an alternative to T_wait, I mean with with the secondary leader always on and producing blocks which the rest of the network doesn't finalize while there are blocks from the primary?
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doesn't finalize but block is produced and included in the chain?
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| ## Context | ||
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| The core idea is to allow a designated secondary author to produce a block for a slot if the primary author fails to do so within a reasonable timeframe. Verification must be possible using only the block header and the parent state. |
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reasonable timeframe
add somewhere description of this timeframe:
- is it some parameter, e.g. we wait this time until secondary leader starts producing blocks and then switch to next is he fails?
- or it's metric to be determined later?
| 1. **Deterministic Secondary Author:** For any given slot `S`, we already have the primary author `P_primary` determined by `slot_author`. We need to define a deterministic way to find the *secondary* author, `P_secondary`, for that same slot `S`. A simple and common approach is to pick the *next* authority in the current session's round-robin order. | ||
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| * Modify `slot_author` or add a new function, e.g., `get_slot_authors(slot, session_length, authorities)` that returns `Option<(PrimaryAuthorityId, SecondaryAuthorityId)>`. | ||
| * The secondary could be `authorities[(primary_index + 1) % authorities.len()]`. Handle edge cases like only one authority. |
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Handle edge cases like only one authority.
describe that edge cases are handled by a minimum number of validators, which is regulated by network and staking parameters
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Related to #248