(left after committing a block)
Fixes#2961
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ORIGINAL ISSUE
Tendermint version : 0.26.4-b771798d
ABCI app : kv-store
Environment:
OS (e.g. from /etc/os-release): macOS 10.14.1 What happened: Set
mempool.recheck = false and create empty block = false in config.toml.
When transactions get added right between a new empty block is being
proposed and committed, the proposer won't propose new block for that
transactions immediately after. That transactions are stuck in the
mempool until a new transaction is added and trigger the proposer.
What you expected to happen: If there is a transaction left in the
mempool, new block should be proposed immediately.
Have you tried the latest version: yes
How to reproduce it (as minimally and precisely as possible): Fire two
transaction using broadcast_tx_sync with specific delay between them.
(You may need to do it multiple time before the right delay is found, on
my machine the delay is 0.98s)
Logs (paste a small part showing an error (< 10 lines) or link a
pastebin, gist, etc. containing more of the log file):
https://pastebin.com/0Wt6uhPF
Config (you can paste only the changes you've made): [mempool] recheck =
false create_empty_block = false
Anything else we need to know: In mempool.go, we found that proposer
will immediately propose new block if
Last committed block has some transaction (causing AppHash to changed)
or mem.notifyTxsAvailable() is called. Our scenario is as followed.
A transaction is fired, it will create 1 block with 1 tx (line 1-4 in
the log) and 1 empty block. After the empty block is proposed but before
it is committed, second transaction is fired and added to mempool. (line
8-16) Now, since the last committed block is empty and
mem.notifyTxsAvailable() will be called only if mempool.recheck = true.
The proposer won't immediately propose new block, causing the second
transaction to stuck in mempool until another transaction is added to
mempool and trigger mem.notifyTxsAvailable().