Understanding Ethereum Transaction Priority in Mempool
When performing Ethereum transactions in the Ethereum blockchain, understanding the priority order of transactions is crucial. However, as you may have noticed, there were cases when the transactions were not confirmed on the gas bill, even though they charged a lower commission.
In this article, we will look at the transaction priority mechanism in Ethereum and explain why it can happen.
Mempool queue
An Ethereum mempool is a distributed queue that allows users to submit transactions for verification. Mempool is full of users who want to send Ether (ETH) to other nodes or to their own wallets. When sending new transactions, they are added to the mempool queue and await confirmation.
Event Priority
The priority of events in the Mempool queue is determined by a combination of several factors, including:
- Gas price: events with higher gas prices have a lower priority.
- Amount of gas commission: the amount of ether credited to the sender’s wallet affects the priority of the transaction.
- Event priority order: the order in which events are sent affects their priority.
Why transactions with lower fees are not confirmed first
When a new event is sent, it is added to the mempool queue to other pending events. To ensure that only legitimate transactions are processed first, Ethereum uses a priority system. However, there were cases when transactions with a lower commission did not receive proper confirmation.
This can happen in several ways:
- Gas price limit
: if the gas price for a transaction exceeds the expected gas consumption for the operation (for example, sending 100 ethers per contract), it can be moved to the end of the queue.
- Priority of transactions: Transactions were sent in the order in which transactions could be processed with higher fees, even if they have lower fees.
- Memory Pool Overload: If the memory pool is overloaded, high-priority events may not be confirmed due to the overload.
Troubleshooting
To minimize the impact of this problem, developers and users can take several steps:
- Use the command line tool “ethgasprice” to estimate the cost of gas for specific operations.
- Optimize transaction structures, for example, using functions that consume less gas, or reducing the number of calls that consume less gas.
- Monitor mempool overload using tools such as Infura’s “mempool” API or third-party services.
In conclusion, it can be said that understanding the working principle of Ethereum transaction priority is important for optimizing Ether transactions and preventing potential problems. By understanding these mechanisms and applying advanced techniques to mitigate this problem, developers can ensure that high-priority events receive proper acknowledgment first.