Module solana_runtime::epoch_accounts_hash

The Epoch Accounts Hash (EAH) is a special hash of the whole accounts state that occurs once per epoch.

This hash is special because all nodes in the cluster will calculate the accounts hash at a predetermined slot in the epoch and then save that result into a later Bank at a predetermined slot.

This results in all nodes effectively voting on the accounts state (at least) once per epoch.

Structs

CalculationInfo

All the EAH calculation information for a specific epoch

EpochAccountsHash

The EpochAccountsHash holds the result after calculating the accounts hash once per epoch

EpochAccountsHashManager

Manage the epoch accounts hash

Functions

calculation_info

For the epoch that bank is in, get all the EAH calculation information

calculation_interval

Get the number of slots from EAH calculation start to stop; known as the calculation interval

calculation_offset_start

Calculation of the EAH occurs once per epoch. All nodes in the cluster must agree on which slot the EAH is based on. This slot will be at an offset into the epoch, and referred to as the “start” slot for the EAH calculation.

calculation_offset_stop

Calculation of the EAH occurs once per epoch. All nodes in the cluster must agree on which bank will hash the EAH into its Bank::hash. This slot will be at an offset into the epoch, and referred to as the “stop” slot for the EAH calculation. All nodes must complete the EAH calculation before this slot!

calculation_start

For the epoch that bank is in, get the slot that the EAH calculation starts

calculation_stop

For the epoch that bank is in, get the slot that the EAH calculation stops

is_enabled_this_epoch

Is the EAH enabled this Epoch?

is_in_calculation_window

Is this bank in the calculation window?