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remove speculation when stale#4649
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heifner merged 3 commits intoJul 14, 2018
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in the current default mode, a node attempts to act as a good p2p citizen and relay transactions. This requires creating a speculative block. However, in times when a network has steady transactions and the node is stale, this creates a storm of database activity managing our transaction deduplication list as "time" bounces from current for speculation to stale for applying incoming blocks. The new default is to only open a speculative block when the node is in sync. If transactions come in while the node is out of sync they are queued instead of immidiately executed and relayed. The result is a significant speed up when syncing in to a live network with some traffic on it. The old default can be restored by using the new `enable-stale-speculation` config parameter
heifner
approved these changes
Jul 13, 2018
heifner
reviewed
Jul 14, 2018
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| producer_options.add_options() | ||
| ("enable-stale-production,e", boost::program_options::bool_switch()->notifier([this](bool e){my->_production_enabled = e;}), "Enable block production, even if the chain is stale.") | ||
| ("enable-stale-speculation", boost::program_options::bool_switch()->notifier([this](bool e){my->_enable_stale_speculation = e;}), "Enable speculative execution and relay, even if the chain is stale.") |
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I don't see any reason to include this option.
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I'm leaning towards agreeing. It is only present to maintain the original default functionality however, there seems to be almost zero value in that mode of operation.
…able-stale-speculation
…now misleading ¯\_(ツ)_/¯
wanderingbort
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Jul 17, 2018
Previously, we based the stale speculation check on the `_production_enabled` flag which is set, at most, once per process. This lead to a situation where a node which fell behind would still speculate. This changes that check to be based on the age of the head block so, nodes which fall behind will stop speculating. NOTE, this only affects speculative modes, actual production should attempt to proceed despite the age of the head block. relates to EOSIO#4649
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in the current default mode, a node attempts to act as a good p2p citizen and relay transactions. This requires creating a speculative block. However, in times when a network has steady transactions and the node is stale, this creates a storm of database activity managing our transaction deduplication list as "time" bounces from current for speculation to stale for applying incoming blocks.
The new default is to only open a speculative block when the node is in sync. If transactions come in while the node is out of sync they are queued instead of immidiately executed and relayed. The result is a significant speed up when syncing in to a live network with some traffic on it.
The old default can be restored by using the new
enable-stale-speculationconfig parameter