Introduction to the new source code of substrat: fix the memory leak of the mission engine of beefy, and optimize the smart contract deletion queue

20220620 - 20220626

newly added

staking-miner info

command

staking-miner  yes substrate A tool provided ,  Used to verify and calculate substrate The chain NPoS The election ,  For optimization ,  Its function is to constantly monitor

pallet-election-provider-multi-phase

,  To submit NPoS An electoral solution for .  About Substrate The election process and its algorithm ,  We will send a special article to explain in detail . staking-miner You can usually use  

cargo build --release --locked --package staking-miner

Command to generate related files ,  And then through

docker build -t staking-miner -f scripts/ci/dockerfiles/staking-miner/staking-miner_injected.Dockerfile target/release

Command to generate the injection ,  Finally through

staking-miner

Command to run .

This update provides a  info Sons command ,  Used to print the current runtime and

staking-miner

Supported version .

details : 

https://github.com/paritytech/polkadot/pull/5577

Contract Optimize :  Reduce the size of the storage item queue to be deleted

Pallet Contracts in ,  For deleted contract Will be put into the

DeletionQueue

In the middle , Currently, the queue is set to have

157977

term ,  Each of these projects has 128byte,  A total of 19Mib size . Parity Developers think ,  Delete a... From contract Your behavior seems to be less common ,  So adjust it to 128 term ,  This reduces the size of the queue to 16KiB 了 .

details : https://github.com/paritytech/substrate/pull/11696

Repair BEEFY Of gossip Engine memory leak problem

Before BEEFY agreement ( Boca is used in the same way as Ethereum substrate Build a cross chain protocol ) Of gossip There is a memory leak in the broadcast engine ,  Specifically when BEEFY Consensus algorithm enters client At the stage , runtime Not actually used BEEFY,  This can cause memory leaks .  This update fixes it .  However, due to some parallel chains, the existing code is already running ,  Therefore, the parallel chain can choose whether to upgrade it .

details : https://github.com/paritytech/substrate/pull/11694

pallet-beefy-mmr Add new API

pallet-beefy-mmr yes pallet-beefy Collaboration module for ,  Used for the substrate The chain is the cross chain of Poka ecology ;  This update adds some hook function ,  And implemented

pallet-beefy::OnNewValidatorSet

Events are used to notify BEEFY The verifier of ,  as well as

authority_set_proof

Used to return the current BEEFY authority, 

next_authority_set_proof

Go back to the next and so on . At the same time in the test network Rococo The above... Has been added to API For testing .

details : https://github.com/paritytech/substrate/pull/11406

XCM The actuator increases the event with weight cost

At present XCM The actuator is finished XCM After the instruction ,  The triggered result event does not contain the weight cost ;  This update adds it ;  thereafter ,  No matter what XCM Whether the instruction execution failed or succeeded ,  The triggered event will record how much weight cost is spent ;  Developers can make corresponding statistics and optimization according to the results .

details : https://github.com/paritytech/cumulus/pull/1286

This paper is about SEP Creation  Original group articles ,  By pengyalun

Unauthorized ,  Do not reprint .