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  1. How to read logs
  2. ================
  3. Walk through example
  4. --------------------
  5. We first create three connections (mempool, consensus and query) to the
  6. application (running ``kvstore`` locally in this case).
  7. ::
  8. I[10-04|13:54:27.364] Starting multiAppConn module=proxy impl=multiAppConn
  9. I[10-04|13:54:27.366] Starting localClient module=abci-client connection=query impl=localClient
  10. I[10-04|13:54:27.366] Starting localClient module=abci-client connection=mempool impl=localClient
  11. I[10-04|13:54:27.367] Starting localClient module=abci-client connection=consensus impl=localClient
  12. Then Tendermint Core and the application perform a handshake.
  13. ::
  14. I[10-04|13:54:27.367] ABCI Handshake module=consensus appHeight=90 appHash=E0FBAFBF6FCED8B9786DDFEB1A0D4FA2501BADAD
  15. I[10-04|13:54:27.368] ABCI Replay Blocks module=consensus appHeight=90 storeHeight=90 stateHeight=90
  16. I[10-04|13:54:27.368] Completed ABCI Handshake - Tendermint and App are synced module=consensus appHeight=90 appHash=E0FBAFBF6FCED8B9786DDFEB1A0D4FA2501BADAD
  17. After that, we start a few more things like the event switch, reactors, and
  18. 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=46656
  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(@10.0.2.15:46656)
  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. Notice the second row where Tendermint Core reports that "This node is a
  36. validator". It also could be just an observer (regular node).
  37. Next we replay all the messages from the WAL.
  38. ::
  39. I[10-04|13:54:30.390] Catchup by replaying consensus messages module=consensus height=91
  40. I[10-04|13:54:30.390] Replay: New Step module=consensus height=91 round=0 step=RoundStepNewHeight
  41. I[10-04|13:54:30.390] Replay: Done module=consensus
  42. "Started node" message signals that everything is ready for work.
  43. ::
  44. I[10-04|13:54:30.391] Starting RPC HTTP server on tcp socket 0.0.0.0:46657 module=rpc-server
  45. I[10-04|13:54:30.392] Started node module=main nodeInfo="NodeInfo{pk: PubKeyEd25519{DF22D7C92C91082324A1312F092AA1DA197FA598DBBFB6526E177003C4D6FD66}, moniker: anonymous, network: test-chain-3MNw2N [remote , listen 10.0.2.15:46656], 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://0.0.0.0:46657])}"
  46. Next follows a standard block creation cycle, where we enter a new round,
  47. propose a block, receive more than 2/3 of prevotes, then precommits and finally
  48. have a chance to commit a block. For details, please refer to `Consensus
  49. Overview
  50. <introduction.html#consensus-overview>`__
  51. or `Byzantine Consensus Algorithm
  52. <specification.html>`__.
  53. ::
  54. I[10-04|13:54:30.393] enterNewRound(91/0). Current: 91/0/RoundStepNewHeight module=consensus
  55. I[10-04|13:54:30.393] enterPropose(91/0). Current: 91/0/RoundStepNewRound module=consensus
  56. 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}"
  57. 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.../}}"
  58. I[10-04|13:54:30.397] Received complete proposal block module=consensus height=91 hash=F671D562C7B9242900A286E1882EE64E5556FE9E
  59. I[10-04|13:54:30.397] enterPrevote(91/0). Current: 91/0/RoundStepPropose module=consensus
  60. I[10-04|13:54:30.397] enterPrevote: ProposalBlock is valid module=consensus height=91 round=0
  61. 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
  62. 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[]}"
  63. I[10-04|13:54:30.401] enterPrecommit(91/0). Current: 91/0/RoundStepPrevote module=consensus
  64. I[10-04|13:54:30.401] enterPrecommit: +2/3 prevoted proposal block. Locking module=consensus hash=F671D562C7B9242900A286E1882EE64E5556FE9E
  65. 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
  66. 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[]}"
  67. I[10-04|13:54:30.404] enterCommit(91/0). Current: 91/0/RoundStepPrecommit module=consensus
  68. I[10-04|13:54:30.405] Finalizing commit of block with 0 txs module=consensus height=91 hash=F671D562C7B9242900A286E1882EE64E5556FE9E root=E0FBAFBF6FCED8B9786DDFEB1A0D4FA2501BADAD
  69. I[10-04|13:54:30.405] Block{
  70. Header{
  71. ChainID: test-chain-3MNw2N
  72. Height: 91
  73. Time: 2017-10-04 13:54:30.393 +0000 UTC
  74. NumTxs: 0
  75. LastBlockID: F15AB8BEF9A6AAB07E457A6E16BC410546AA4DC6:1:D505DA273544
  76. LastCommit: 56FEF2EFDB8B37E9C6E6D635749DF3169D5F005D
  77. Data:
  78. Validators: CE25FBFF2E10C0D51AA1A07C064A96931BC8B297
  79. App: E0FBAFBF6FCED8B9786DDFEB1A0D4FA2501BADAD
  80. }#F671D562C7B9242900A286E1882EE64E5556FE9E
  81. Data{
  82. }#
  83. Commit{
  84. BlockID: F15AB8BEF9A6AAB07E457A6E16BC410546AA4DC6:1:D505DA273544
  85. Precommits: Vote{0:125B0E3C5512 90/00/2(Precommit) F15AB8BEF9A6 {/FE98E2B956F0.../}}
  86. }#56FEF2EFDB8B37E9C6E6D635749DF3169D5F005D
  87. }#F671D562C7B9242900A286E1882EE64E5556FE9E module=consensus
  88. I[10-04|13:54:30.408] Executed block module=state height=91 validTxs=0 invalidTxs=0
  89. I[10-04|13:54:30.410] Committed state module=state height=91 txs=0 hash=E0FBAFBF6FCED8B9786DDFEB1A0D4FA2501BADAD
  90. I[10-04|13:54:30.410] Recheck txs module=mempool numtxs=0 height=91
  91. List of modules
  92. ---------------
  93. Here is the list of modules you may encounter in Tendermint's log and a little
  94. overview what they do.
  95. - ``abci-client`` As mentioned in `Application Development Guide
  96. <app-development.html#abci-design>`__,
  97. Tendermint acts as an ABCI client with respect to the application and
  98. maintains 3 connections: mempool, consensus and query. The code used by
  99. Tendermint Core can be found `here
  100. <https://github.com/tendermint/abci/tree/master/client>`__.
  101. - ``blockchain``
  102. Provides storage, pool (a group of peers), and reactor for both storing and
  103. exchanging blocks between peers.
  104. - ``consensus``
  105. The heart of Tendermint core, which is the implementation of the consensus
  106. algorithm. Includes two "submodules": ``wal`` (write-ahead logging) for
  107. ensuring data integrity and ``replay`` to replay blocks and messages on
  108. recovery from a crash.
  109. - ``events``
  110. Simple event notification system. The list of events can be found
  111. `here
  112. <https://github.com/tendermint/tendermint/blob/master/types/events.go>`__.
  113. You can subscribe to them by calling ``subscribe`` RPC method.
  114. Refer to `RPC docs
  115. <specification/rpc.html>`__
  116. for additional information.
  117. - ``mempool``
  118. Mempool module handles all incoming transactions, whenever they are
  119. coming from peers or the application.
  120. - ``p2p``
  121. Provides an abstraction around peer-to-peer communication. For more details,
  122. please check out the `README
  123. <https://github.com/tendermint/tendermint/blob/56c60fba2381e4ac41d2ae38a1eb6569acfbc095/p2p/README.md>`__.
  124. - ``rpc``
  125. `Tendermint's RPC <specification/rpc.html>`__.
  126. - ``rpc-server``
  127. RPC server. For implementation details, please read the `README <https://github.com/tendermint/tendermint/blob/master/rpc/lib/README.md>`__.
  128. - ``state``
  129. Represents the latest state and execution submodule, which executes
  130. blocks against the application.
  131. - ``types``
  132. A collection of the publicly exposed types and methods to work with them.