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a506cf47ad
Fixes #1414 DATA RACE: ``` Read at 0x00c4214ee940 by goroutine 146: github.com/tendermint/tendermint/consensus.(*peerStateStats).String() <autogenerated>:1 +0x57 fmt.(*pp).handleMethods() /usr/local/go/src/fmt/print.go:596 +0x3f4 fmt.(*pp).printArg() /usr/local/go/src/fmt/print.go:679 +0x11f fmt.(*pp).doPrintf() /usr/local/go/src/fmt/print.go:996 +0x319 fmt.Sprintf() /usr/local/go/src/fmt/print.go:196 +0x73 github.com/tendermint/tendermint/consensus.(*PeerState).StringIndented() github.com/tendermint/tendermint/consensus/_test/_obj_test/reactor.go:1426 +0x573 github.com/tendermint/tendermint/consensus.(*PeerState).String() github.com/tendermint/tendermint/consensus/_test/_obj_test/reactor.go:1419 +0x66 github.com/go-logfmt/logfmt.safeString() /home/ubuntu/go/src/github.com/go-logfmt/logfmt/encode.go:299 +0x9d github.com/go-logfmt/logfmt.writeValue() /home/ubuntu/go/src/github.com/go-logfmt/logfmt/encode.go:217 +0x5a0 github.com/go-logfmt/logfmt.(*Encoder).EncodeKeyval() /home/ubuntu/go/src/github.com/go-logfmt/logfmt/encode.go:61 +0x1dd github.com/tendermint/tmlibs/log.tmfmtLogger.Log() /home/ubuntu/go/src/github.com/tendermint/tmlibs/log/tmfmt_logger.go:107 +0x1001 github.com/tendermint/tmlibs/log.(*tmfmtLogger).Log() <autogenerated>:1 +0x93 github.com/go-kit/kit/log.(*context).Log() /home/ubuntu/go/src/github.com/go-kit/kit/log/log.go:124 +0x248 github.com/tendermint/tmlibs/log.(*tmLogger).Debug() /home/ubuntu/go/src/github.com/tendermint/tmlibs/log/tm_logger.go:64 +0x1d0 github.com/tendermint/tendermint/consensus.(*PeerState).PickSendVote() github.com/tendermint/tendermint/consensus/_test/_obj_test/reactor.go:1059 +0x242 github.com/tendermint/tendermint/consensus.(*ConsensusReactor).gossipVotesForHeight() github.com/tendermint/tendermint/consensus/_test/_obj_test/reactor.go:789 +0x6ef github.com/tendermint/tendermint/consensus.(*ConsensusReactor).gossipVotesRoutine() github.com/tendermint/tendermint/consensus/_test/_obj_test/reactor.go:723 +0x1039 Previous write at 0x00c4214ee940 by goroutine 21: github.com/tendermint/tendermint/consensus.(*PeerState).RecordVote() github.com/tendermint/tendermint/consensus/_test/_obj_test/reactor.go:1242 +0x15a github.com/tendermint/tendermint/consensus.(*ConsensusReactor).Receive() github.com/tendermint/tendermint/consensus/_test/_obj_test/reactor.go:309 +0x32e6 github.com/tendermint/tendermint/p2p.createMConnection.func1() /home/ubuntu/go/src/github.com/tendermint/tendermint/p2p/peer.go:365 +0xea github.com/tendermint/tendermint/p2p/conn.(*MConnection).recvRoutine() /home/ubuntu/go/src/github.com/tendermint/tendermint/p2p/conn/connection.go:531 +0x779 ```
The core consensus algorithm.
- state.go - The state machine as detailed in the whitepaper
- reactor.go - A reactor that connects the state machine to the gossip network
Go-routine summary
The reactor runs 2 go-routines for each added peer: gossipDataRoutine and gossipVotesRoutine.
The consensus state runs two persistent go-routines: timeoutRoutine and receiveRoutine. Go-routines are also started to trigger timeouts and to avoid blocking when the internalMsgQueue is really backed up.
Replay/WAL
A write-ahead log is used to record all messages processed by the receiveRoutine, which amounts to all inputs to the consensus state machine: messages from peers, messages from ourselves, and timeouts. They can be played back deterministically at startup or using the replay console.