110 lines
4.3 KiB
Nim
110 lines
4.3 KiB
Nim
# Nimbus
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# Copyright (c) 2021 Status Research & Development GmbH
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# Licensed under either of
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# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
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# http://www.apache.org/licenses/LICENSE-2.0)
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# * MIT license ([LICENSE-MIT](LICENSE-MIT) or
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# http://opensource.org/licenses/MIT)
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# at your option. This file may not be copied, modified, or distributed
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# except according to those terms.
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{.push raises: [Defect].}
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const
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pivotBlockDistanceMin* = 128
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## The minimal depth of two block headers needed to activate a new state
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## root pivot.
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##
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## Effects on assembling the state via `snap/1` protocol:
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##
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## * A small value of this constant increases the propensity to update the
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## pivot header more often. This is so because each new peer negoiates a
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## pivot block number at least the current one.
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##
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## * A large value keeps the current pivot more stable but some experiments
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## suggest that the `snap/1` protocol is answered only for later block
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## numbers (aka pivot blocks.) So a large value tends to keep the pivot
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## farther away from the chain head.
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##
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## Note that 128 is the magic distance for snapshots used by *Geth*.
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pivotEnvStopChangingIfComplete* = true
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## If set `true`, new peers will not change the pivot even if the
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## negotiated pivot would be newer. This should be the default.
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# --------------
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snapRequestBytesLimit* = 2 * 1024 * 1024
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## Soft bytes limit to request in `snap` protocol calls.
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snapStoragesSlotsFetchMax* = 2 * 1024
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## Maximal number of storage tries to fetch with a single message.
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snapTrieNodeFetchMax* = 1024
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## Informal maximal number of trie nodes to fetch at once. This is not
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## an official limit but found on several implementations (e.g. Geth.)
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##
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## Resticting the fetch list length early allows to better paralellise
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## healing.
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snapAccountsHealBatchFetchMax* = 5 * snapTrieNodeFetchMax
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## Keap on gloing in healing task up until this many nodes have been
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## fetched from the network or some error contition therminates the task.
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# --------------
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healAccountsTrigger* = 0.95
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## Apply accounts healing if the global snap download coverage factor
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## exceeds this setting. The global coverage factor is derived by merging
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## all account ranges retrieved for all pivot state roots (see
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## `coveredAccounts` in `CtxData`.)
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##
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## A small value of this constant leads to early healing. This produces
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## stray leaf account records so fragmenting larger intervals of missing
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## account ranges. This in turn leads to smaller but more range requests
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## over the network. More requests might be a disadvantage if peers only
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## serve a maximum number requests (rather than data.)
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healSlorageSlotsTrigger* = 0.70
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## Consider per account storage slost healing if a per-account hexary
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## sub-trie has reached this factor of completeness.
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healStoragesSlotsBatchMax* = 32
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## Maximal number of storage tries to to heal in a single batch run. Only
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## this many items will be removed from the batch queue. These items will
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## then be processed one by one.
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# --------------
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comErrorsTimeoutMax* = 4
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## Maximal number of non-resonses accepted in a row. If there are more than
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## `comErrorsTimeoutMax` consecutive errors, the worker will be degraded
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## as zombie.
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comErrorsTimeoutSleepMSecs* = 5000
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## Wait/suspend for this many seconds after a timeout error if there are
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## not more than `comErrorsTimeoutMax` errors in a row (maybe some other
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## network or no-data errors mixed in.) Set 0 to disable.
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comErrorsNetworkMax* = 5
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## Similar to `comErrorsTimeoutMax` but for network errors.
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comErrorsNetworkSleepMSecs* = 5000
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## Similar to `comErrorsTimeoutSleepSecs` but for network errors.
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## Set 0 to disable.
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comErrorsNoDataMax* = 3
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## Similar to `comErrorsTimeoutMax` but for missing data errors.
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comErrorsNoDataSleepMSecs* = 0
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## Similar to `comErrorsTimeoutSleepSecs` but for missing data errors.
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## Set 0 to disable.
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static:
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doAssert healAccountsTrigger < 1.0 # larger values make no sense
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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