From mongo， transactions become irreversible after ~40 second, not ~3 second!

[zhopen]

Image: boscore/bos:v3.0.2
Contracts: v3.0.2
Block producers: 3

I send transaction to contract and get trx_id.
Then, I query the transaction pushed from mongodb. I find: updatedAt - createdAt = 34 seconds.
How to make transaction irreversible in mongdb in 3 seconds.

[root@psn230m2 node]# cl push action ab add '
> {
>     "account": "alice",
>     "name": "lis4",
>     "age":  "22",
>     "phonenumber": 13911113333,
>     "address": "address"
> }' -p alice; cl get info
executed transaction: e8d4dc466178ebaf287a2eefd0b5257430a1063a2eb6ff8ecd8833df7141f311  136 bytes  371 us
#            ab <= ab::add                      {"account":"alice","name":"lis4","age":22,"phonenumber":"13911113333","address":"address"...
warning: transaction executed locally, but may not be confirmed by the network yet         ] 

{
  "server_version": "b24a643a",
  "chain_id": "cf057bbfb72640471fd910bcb67639c22df9f92470936cddc1ade0e2f2e7dc4f",
  "head_block_num": 12630,
  "last_irreversible_block_num": 12627,
  "last_irreversible_block_id": "00003153c189190ff3581b3ebbb74f7b7342cc6dae2c3dce78d14e14e7c9cd03",
  "head_block_id": "000031565edfffa072fac5cb73117f9b7353aa9523f83a7b9d67b13e78fbab74",
  "head_block_time": "2019-11-13T08:13:39.000",
  "head_block_producer": "prod1",
  "current_view": 2,
  "target_view": 3,
  "last_stable_checkpoint_block_num": 12601,
  "virtual_block_cpu_limit": 200000000,
  "virtual_block_net_limit": 1048576000,
  "block_cpu_limit": 199529,
  "block_net_limit": 1048440,
  "server_version_string": "v3.0.2"
}

> db.transactions.find({"trx_id":"e8d4dc466178ebaf287a2eefd0b5257430a1063a2eb6ff8ecd8833df7141f311"}).pretty()
{
	"_id" : ObjectId("5dcbbb33cc9bc8e1007691b0"),
	"trx_id" : "e8d4dc466178ebaf287a2eefd0b5257430a1063a2eb6ff8ecd8833df7141f311",
	"accepted" : true,
	"actions" : [
		{
			"account" : "ab",
			"name" : "add",
			"authorization" : [
				{
					"actor" : "alice",
					"permission" : "active"
				}
			],
			"data" : {
				"account" : "alice",
				"name" : "lis4",
				"age" : 22,
				"phonenumber" : "13911113333",
				"address" : "address"
			},
			"hex_data" : "0000000000855c34046c6973341675be2a3d0300000012e58c97e4baace5b882e8a5bfe59f8ee58cba"
		}
	],
	"context_free_actions" : [ ],
	"context_free_data" : [ ],
	"createdAt" : ISODate("2019-11-13T08:13:39.511Z"),
	"delay_sec" : 0,
	"expiration" : "2019-11-13T08:14:09",
	"implicit" : false,
	"max_cpu_usage_ms" : 0,
	"max_net_usage_words" : 0,
	"ref_block_num" : 12627,
	"ref_block_prefix" : 1041979635,
	"scheduled" : false,
	"signatures" : [
		"SIG_K1_KWL2aLiwGDxeSz1ztRrYDkLREPXvcAnDXd5ffLuagNqzZ7d7oPe29vF5Uz6etvkPPKKFaDDDUbKz4txELrqb5Px8H4nLdH"
	],
	"signing_keys" : {
		"0" : "EOS7HxPMkfyL69PqLXduP9YfuvVad8e3Nry6ryDGaJ2u8BKB2zUUm"
	},
	"transaction_extensions" : [ ],
	"block_id" : "0000315714cf74bf07cb9f2158e54794f6b30dce2114d91d097dd1199e8c2cd3",
	"block_num" : 12631,
	"irreversible" : true,
	"updatedAt" : ISODate("2019-11-13T08:14:25.030Z")
}

[qianxiaofeng]

is the head-lib normal in mongodb-plugin enabled node?

[zhopen]

is the head-lib normal in mongodb-plugin enabled node?

"head_block_num": 12630,
"last_irreversible_block_num": 12627
head_block_num-last_irreversible_block_num is always around 3.

{
  "server_version": "b24a643a",
  "chain_id": "cf057bbfb72640471fd910bcb67639c22df9f92470936cddc1ade0e2f2e7dc4f",
  "head_block_num": 12630,
  "last_irreversible_block_num": 12627,
  "last_irreversible_block_id": "00003153c189190ff3581b3ebbb74f7b7342cc6dae2c3dce78d14e14e7c9cd03",
  "head_block_id": "000031565edfffa072fac5cb73117f9b7353aa9523f83a7b9d67b13e78fbab74",
  "head_block_time": "2019-11-13T08:13:39.000",
  "head_block_producer": "prod1",
  "current_view": 2,
  "target_view": 3,
  "last_stable_checkpoint_block_num": 12601,
  "virtual_block_cpu_limit": 200000000,
  "virtual_block_net_limit": 1048576000,
  "block_cpu_limit": 199529,
  "block_net_limit": 1048440,
  "server_version_string": "v3.0.2"
}

[oldcold]

In batch-pbft, irreversible_block signals are emitted upon the lscb advancing, and by default, old plugins tend to capture these signals to update their db status. Probably for a better experience, we will introduce a new channel dedicatedly emitting newly applied libs signals.

[cppfuns]

Expect this issue to be resolved first