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  1. # How to read logs
  2. ## Walkabout example
  3. We first create three connections (mempool, consensus and query) to the
  4. application (running `kvstore` locally in this case).
  5. ```
  6. I[10-04|13:54:27.364] Starting multiAppConn module=proxy impl=multiAppConn
  7. I[10-04|13:54:27.366] Starting localClient module=abci-client connection=query impl=localClient
  8. I[10-04|13:54:27.366] Starting localClient module=abci-client connection=mempool impl=localClient
  9. I[10-04|13:54:27.367] Starting localClient module=abci-client connection=consensus impl=localClient
  10. ```
  11. Then Tendermint Core and the application perform a handshake.
  12. ```
  13. I[10-04|13:54:27.367] ABCI Handshake module=consensus appHeight=90 appHash=E0FBAFBF6FCED8B9786DDFEB1A0D4FA2501BADAD
  14. I[10-04|13:54:27.368] ABCI Replay Blocks module=consensus appHeight=90 storeHeight=90 stateHeight=90
  15. I[10-04|13:54:27.368] Completed ABCI Handshake - Tendermint and App are synced module=consensus appHeight=90 appHash=E0FBAFBF6FCED8B9786DDFEB1A0D4FA2501BADAD
  16. ```
  17. After that, we start a few more things like the event switch, reactors,
  18. and perform UPNP discover in order to detect the IP address.
  19. ```
  20. I[10-04|13:54:27.374] Starting EventSwitch module=types impl=EventSwitch
  21. I[10-04|13:54:27.375] This node is a validator module=consensus
  22. I[10-04|13:54:27.379] Starting Node module=main impl=Node
  23. I[10-04|13:54:27.381] Local listener module=p2p ip=:: port=26656
  24. I[10-04|13:54:27.382] Getting UPNP external address module=p2p
  25. I[10-04|13:54:30.386] Could not perform UPNP discover module=p2p err="write udp4 0.0.0.0:38238->239.255.255.250:1900: i/o timeout"
  26. I[10-04|13:54:30.386] Starting DefaultListener module=p2p impl=Listener(@10.0.2.15:26656)
  27. I[10-04|13:54:30.387] Starting P2P Switch module=p2p impl="P2P Switch"
  28. I[10-04|13:54:30.387] Starting MempoolReactor module=mempool impl=MempoolReactor
  29. I[10-04|13:54:30.387] Starting BlockchainReactor module=blockchain impl=BlockchainReactor
  30. I[10-04|13:54:30.387] Starting ConsensusReactor module=consensus impl=ConsensusReactor
  31. I[10-04|13:54:30.387] ConsensusReactor module=consensus fastSync=false
  32. I[10-04|13:54:30.387] Starting ConsensusState module=consensus impl=ConsensusState
  33. I[10-04|13:54:30.387] Starting WAL module=consensus wal=/home/vagrant/.tendermint/data/cs.wal/wal impl=WAL
  34. I[10-04|13:54:30.388] Starting TimeoutTicker module=consensus impl=TimeoutTicker
  35. ```
  36. Notice the second row where Tendermint Core reports that "This node is a
  37. validator". It also could be just an observer (regular node).
  38. Next we replay all the messages from the WAL.
  39. ```
  40. I[10-04|13:54:30.390] Catchup by replaying consensus messages module=consensus height=91
  41. I[10-04|13:54:30.390] Replay: New Step module=consensus height=91 round=0 step=RoundStepNewHeight
  42. I[10-04|13:54:30.390] Replay: Done module=consensus
  43. ```
  44. "Started node" message signals that everything is ready for work.
  45. ```
  46. I[10-04|13:54:30.391] Starting RPC HTTP server on tcp socket 0.0.0.0:26657 module=rpc-server
  47. I[10-04|13:54:30.392] Started node module=main nodeInfo="NodeInfo{id: DF22D7C92C91082324A1312F092AA1DA197FA598DBBFB6526E, moniker: anonymous, network: test-chain-3MNw2N [remote , listen 10.0.2.15:26656], version: 0.11.0-10f361fc ([wire_version=0.6.2 p2p_version=0.5.0 consensus_version=v1/0.2.2 rpc_version=0.7.0/3 tx_index=on rpc_addr=tcp://0.0.0.0:26657])}"
  48. ```
  49. Next follows a standard block creation cycle, where we enter a new
  50. round, propose a block, receive more than 2/3 of prevotes, then
  51. precommits and finally have a chance to commit a block. For details,
  52. please refer to [Consensus
  53. Overview](../introduction/introduction.md#consensus-overview) or [Byzantine Consensus
  54. Algorithm](../spec/consensus/consensus.md).
  55. ```
  56. I[10-04|13:54:30.393] enterNewRound(91/0). Current: 91/0/RoundStepNewHeight module=consensus
  57. I[10-04|13:54:30.393] enterPropose(91/0). Current: 91/0/RoundStepNewRound module=consensus
  58. I[10-04|13:54:30.393] enterPropose: Our turn to propose module=consensus proposer=125B0E3C5512F5C2B0E1109E31885C4511570C42 privValidator="PrivValidator{125B0E3C5512F5C2B0E1109E31885C4511570C42 LH:90, LR:0, LS:3}"
  59. I[10-04|13:54:30.394] Signed proposal module=consensus height=91 round=0 proposal="Proposal{91/0 1:21B79872514F (-1,:0:000000000000) {/10EDEDD7C84E.../}}"
  60. I[10-04|13:54:30.397] Received complete proposal block module=consensus height=91 hash=F671D562C7B9242900A286E1882EE64E5556FE9E
  61. I[10-04|13:54:30.397] enterPrevote(91/0). Current: 91/0/RoundStepPropose module=consensus
  62. I[10-04|13:54:30.397] enterPrevote: ProposalBlock is valid module=consensus height=91 round=0
  63. I[10-04|13:54:30.398] Signed and pushed vote module=consensus height=91 round=0 vote="Vote{0:125B0E3C5512 91/00/1(Prevote) F671D562C7B9 {/89047FFC21D8.../}}" err=null
  64. I[10-04|13:54:30.401] Added to prevote module=consensus vote="Vote{0:125B0E3C5512 91/00/1(Prevote) F671D562C7B9 {/89047FFC21D8.../}}" prevotes="VoteSet{H:91 R:0 T:1 +2/3:F671D562C7B9242900A286E1882EE64E5556FE9E:1:21B79872514F BA{1:X} map[]}"
  65. I[10-04|13:54:30.401] enterPrecommit(91/0). Current: 91/0/RoundStepPrevote module=consensus
  66. I[10-04|13:54:30.401] enterPrecommit: +2/3 prevoted proposal block. Locking module=consensus hash=F671D562C7B9242900A286E1882EE64E5556FE9E
  67. I[10-04|13:54:30.402] Signed and pushed vote module=consensus height=91 round=0 vote="Vote{0:125B0E3C5512 91/00/2(Precommit) F671D562C7B9 {/80533478E41A.../}}" err=null
  68. I[10-04|13:54:30.404] Added to precommit module=consensus vote="Vote{0:125B0E3C5512 91/00/2(Precommit) F671D562C7B9 {/80533478E41A.../}}" precommits="VoteSet{H:91 R:0 T:2 +2/3:F671D562C7B9242900A286E1882EE64E5556FE9E:1:21B79872514F BA{1:X} map[]}"
  69. I[10-04|13:54:30.404] enterCommit(91/0). Current: 91/0/RoundStepPrecommit module=consensus
  70. I[10-04|13:54:30.405] Finalizing commit of block with 0 txs module=consensus height=91 hash=F671D562C7B9242900A286E1882EE64E5556FE9E root=E0FBAFBF6FCED8B9786DDFEB1A0D4FA2501BADAD
  71. I[10-04|13:54:30.405] Block{
  72. Header{
  73. ChainID: test-chain-3MNw2N
  74. Height: 91
  75. Time: 2017-10-04 13:54:30.393 +0000 UTC
  76. NumTxs: 0
  77. LastBlockID: F15AB8BEF9A6AAB07E457A6E16BC410546AA4DC6:1:D505DA273544
  78. LastCommit: 56FEF2EFDB8B37E9C6E6D635749DF3169D5F005D
  79. Data:
  80. Validators: CE25FBFF2E10C0D51AA1A07C064A96931BC8B297
  81. App: E0FBAFBF6FCED8B9786DDFEB1A0D4FA2501BADAD
  82. }#F671D562C7B9242900A286E1882EE64E5556FE9E
  83. Data{
  84. }#
  85. Commit{
  86. BlockID: F15AB8BEF9A6AAB07E457A6E16BC410546AA4DC6:1:D505DA273544
  87. Precommits: Vote{0:125B0E3C5512 90/00/2(Precommit) F15AB8BEF9A6 {/FE98E2B956F0.../}}
  88. }#56FEF2EFDB8B37E9C6E6D635749DF3169D5F005D
  89. }#F671D562C7B9242900A286E1882EE64E5556FE9E module=consensus
  90. I[10-04|13:54:30.408] Executed block module=state height=91 validTxs=0 invalidTxs=0
  91. I[10-04|13:54:30.410] Committed state module=state height=91 txs=0 hash=E0FBAFBF6FCED8B9786DDFEB1A0D4FA2501BADAD
  92. I[10-04|13:54:30.410] Recheck txs module=mempool numtxs=0 height=91
  93. ```
  94. ## List of modules
  95. Here is the list of modules you may encounter in Tendermint's log and a
  96. little overview what they do.
  97. - `abci-client` As mentioned in [Application Development Guide](../app-dev/app-development.md), Tendermint acts as an ABCI
  98. client with respect to the application and maintains 3 connections:
  99. mempool, consensus and query. The code used by Tendermint Core can
  100. be found [here](https://github.com/tendermint/tendermint/tree/master/abci/client).
  101. - `blockchain` Provides storage, pool (a group of peers), and reactor
  102. for both storing and exchanging blocks between peers.
  103. - `consensus` The heart of Tendermint core, which is the
  104. implementation of the consensus algorithm. Includes two
  105. "submodules": `wal` (write-ahead logging) for ensuring data
  106. integrity and `replay` to replay blocks and messages on recovery
  107. from a crash.
  108. - `events` Simple event notification system. The list of events can be
  109. found
  110. [here](https://github.com/tendermint/tendermint/blob/master/types/events.go).
  111. You can subscribe to them by calling `subscribe` RPC method. Refer
  112. to [RPC docs](./rpc.md) for additional information.
  113. - `mempool` Mempool module handles all incoming transactions, whenever
  114. they are coming from peers or the application.
  115. - `p2p` Provides an abstraction around peer-to-peer communication. For
  116. more details, please check out the
  117. [README](https://github.com/tendermint/tendermint/blob/master/p2p/README.md).
  118. - `rpc` [Tendermint's RPC](./rpc.md).
  119. - `rpc-server` RPC server. For implementation details, please read the
  120. [doc.go](https://github.com/tendermint/tendermint/blob/master/rpc/lib/doc.go).
  121. - `state` Represents the latest state and execution submodule, which
  122. executes blocks against the application.
  123. - `types` A collection of the publicly exposed types and methods to
  124. work with them.