Concurrent transactions - replacement transaction underpriced rejection

[kwedrowicz]

Hi,
I would like to send a few transactions from one account in a concurrent way (not wait with next until the previous one would be mined). When leaving setting nonce to web3js I get replacement transaction underpriced error. I can set defaultBlock as "pending" and then get nonce with web3.eth.getTransactionCount but until I explicitly set nonce I doesn't work either. Does web3js supports concurrent transactions like that? It's even more important with contract methods, but with sendTransaction I found a way to working example. I use version 1.0.0-beta27. From the docs I read that when nonce is not set, it's get from web3.eth.getTransactionCount() - why then this example doesn't work with web3.eth.defaultBlock = "pending"?

import { accounts, privateKeys } from "./utils/constants";
const Web3 = require("web3");


describe("Concurrent transactions", () => {

	before(() => {
		this.web3 = new Web3("https://ropsten.infura.io");
		this.web3.eth.defaultBlock = "pending";
		this.web3.eth.accounts.wallet.add(privateKeys[0]);
		this.web3.eth.defaultAccount = accounts[0];
	});

	it("should send concurrent transactions", async () => {
		this.web3.eth.sendTransaction({
			from: accounts[0],
			to: accounts[1],
			value: this.web3.utils.toWei("0.01", "ether"),
			gas: 100000
		}).on("transactionHash", async (transactionHash) => {
			console.log(transactionHash);

			const nextNonce = await this.web3.eth.getTransactionCount(accounts[0], "pending");

			this.web3.eth.sendTransaction({
				from: accounts[0],
				to: accounts[2],
				value: this.web3.utils.toWei("0.02", "ether"),
				gas: 100000,
				// nonce: nextNonce
			}).on("transactionHash", (transactionHash) => console.log(transactionHash));
		});
	});
});

[jdkanani]

Try commenting this.web3.eth.defaultBlock = "pending" and uncommenting nonce: nextNonce

[kwedrowicz]

@jdkanani Of course this works in that way (that is the purpose of the snippet), but I'd like to know why it doesn't work with defaultBlock set.

[wupeaking]

https://ethereum.stackexchange.com/questions/39790/concurrency-patterns-for-account-nonce?newreg=d89f0aa0788b4da7a7fe844ff16903d0 @starspire

[nivida]

I'm closing this issue because increasing the nonce for locally signed transactions got implemented in 2.0.