tendermint

bft blockchain consensus consistency cryptocurrency cryptography db distributed-systems go

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William Banfield 3401eb2410 types: add default values for the synchrony parameters (#7788 ) ## Summary This pull request adds a default set of values to the new Synchrony parameters. These values were chosen by after observation of three live networks: Emoney, Osmosis, and the Cosmos Hub. For the default Precision value, `505ms` was selected. The reasoning for this is summarized in https://github.com/tendermint/tendermint/issues/7724 For each observed chain, an experimental Message Delay was collected over a 24 hour period and an average over this period was calculated using this data. Values over 10s were considered outliers and treated separately for the average since the majority of observations were far below 10s. The message delay was calculated both for the quorum and the 'full' prevote. Description of the technique for collecting the experimental values can found in #7202. This value is calculated only using timestamps given by processes on the network, so large variation in values is almost certainly due to clock skew among the validator set. `12s` is proposed for the default MessageDelay value. This value would easily accomodates all non-outlier values, allowing even E-money's 4.25s value to be valid. This would also allow some validators with skewed clocks to still participate without allowing for huge variation in the timestamps produced by the network. Additionally, for the currently listed use-cases of PBTS, such as unbonding period, and light client trust period, the current bounds for these are in weeks. Adding a few seconds of tolerance by default is therefore unlikely to have serious side-effects. ## Data ### Cosmos Hub Observation Period: 2022-02-03 20:22-2022-02-04 20:22 Avg Full Prevote Message Delay: 1.27s Outliers: 11s,13s,50s,106s,144s Total Outlier Heights: 86 Avg Quorum Prevote Message Delay: .77s Outliers: 10s,14s,107s,144s Total Outlier Heights: 617 Total heights: 11528 ### Osmosis Observation Period: 2022-01-29 20:26-2022-01-28 20:26 Avg Quorum Prevote Message Delay: .46s Outliers: 21s,50s Total Outlier Heights: 26 NOTE: During the observation period, a 'full' prevote was not observed. Total heights: 13983 ### E-Money Observation Period: 2022-02-07 04:29-2022-02-08 04:29 Avg Full Prevote Message Delay: 4.25s Outliers: 12s,15s,39s Total Outlier Heights: 128 Avg Quorum Prevote Message Delay: .20s Outliers: 28s Total Outlier Heights: 15 Total heights: 3791		3 years ago
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block.go	spec: merge spec repo into tendermint repo (#7804)	3 years ago
block_meta.go	types: add string format to 64-bit integer JSON fields (#7787)	3 years ago
block_meta_test.go	state sync: reverse sync implementation (#6463)	3 years ago
block_test.go	types: remove nested evidence field from block (#7765)	3 years ago
canonical.go	abci: Vote Extension 1 (#6646)	3 years ago
canonical_test.go	proto: folder structure adhere to buf (#5025)	4 years ago
encoding_helper.go	proto: leftover amino (#4986)	4 years ago
errors.go	types: change `Commit` to consist of just signatures (#4146)	5 years ago
errors_p2p.go	p2p: make NodeID and NetAddress public (#6583)	3 years ago
events.go	Completed the existing `FinalizeBlock` PR and rebased to master (#7798)	3 years ago
events_test.go	Performance improvements for the event query API (#7319)	3 years ago
evidence.go	types: remove nested evidence field from block (#7765)	3 years ago
evidence_test.go	types: remove nested evidence field from block (#7765)	3 years ago
genesis.go	types: add default values for the synchrony parameters (#7788)	3 years ago
genesis_test.go	Clean up temp files more thoroughly after testing. (#7815)	3 years ago
keys.go	consensus: fixes #1754	7 years ago
light.go	light: return light client status on rpc /status (#7536)	3 years ago
light_test.go	types: tests should not panic (#7506)	3 years ago
mempool.go	mempool,rpc: add removetx rpc method (#7047)	3 years ago
node_id.go	p2p, types: remove legacy NetAddress type (#7084)	3 years ago
node_info.go	libs/strings: cleanup string helper function package (#7808)	3 years ago
node_info_test.go	Completed the existing `FinalizeBlock` PR and rebased to master (#7798)	3 years ago
node_key.go	rpc: use encoding/json rather than tmjson (#7670)	3 years ago
node_key_test.go	testing: pass testing.T to assert and require always, assertion cleanup (#7508)	3 years ago
params.go	types: add default values for the synchrony parameters (#7788)	3 years ago
params_test.go	Proposer-Based Timestamps Merge (#7605)	3 years ago
part_set.go	Replace uses of libs/json with encoding/json. (#7534)	3 years ago
part_set_test.go	testing: pass testing.T to assert and require always, assertion cleanup (#7508)	3 years ago
priv_validator.go	testing: remove background contexts (#7509)	3 years ago
proposal.go	spec: merge spec repo into tendermint repo (#7804)	3 years ago
proposal_test.go	types: make timely predicate adaptive after 10 rounds (#7739)	3 years ago
protobuf.go	cleanup: Reduce and normalize import path aliasing. (#6975)	3 years ago
protobuf_test.go	testing: pass testing.T to assert and require always, assertion cleanup (#7508)	3 years ago
results.go	state: revert event hashing (#5159)	4 years ago
results_test.go	[block#LastResultsHash] add Events + GasWanted/Used (#4845)	4 years ago
signable.go	correct spelling to US english (#6077)	4 years ago
signed_msg_type.go	proto: folder structure adhere to buf (#5025)	4 years ago
test_util.go	testing: remove background contexts (#7509)	3 years ago
tx.go	Rebased to master the existing `ProcessProposal` PR (#7752)	3 years ago
tx_test.go	testing: pass testing.T to assert and require always, assertion cleanup (#7508)	3 years ago
utils.go	libs/common: refactor libs common 3 (#4232)	5 years ago
validation.go	lint: fix collection of stale errors (#7090)	3 years ago
validation_test.go	types: tests should not panic (#7506)	3 years ago
validator.go	rpc: use encoding/json rather than tmjson (#7670)	3 years ago
validator_set.go	errors: formating cleanup (#7507)	3 years ago
validator_set_test.go	types: tests should not panic (#7506)	3 years ago
validator_test.go	Completed the existing `FinalizeBlock` PR and rebased to master (#7798)	3 years ago
vote.go	abci: PrepareProposal-VoteExtension integration [2nd try] (#7821)	3 years ago
vote_set.go	abci: PrepareProposal-VoteExtension integration [2nd try] (#7821)	3 years ago
vote_set_test.go	Proposer-Based Timestamps Merge (#7605)	3 years ago
vote_test.go	abci: Vote Extension 1 (#6646)	3 years ago