dabit3

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

import "@openzeppelin/contracts/utils/Counters.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";

import "hardhat/console.sol";

contract NFTMarketplace is ERC721URIStorage {

chfritz

#!/bin/bash

# Script to enable oplog tailing in a production meteor deployment using mongodb 4.0 or later

echo "# Enabling replication, required for oplog tailing" >> /etc/mongod.conf
echo "replication:" >> /etc/mongod.conf
echo "  oplogSizeMB: 100" >> /etc/mongod.conf
echo "  replSetName: rs0" >> /etc/mongod.conf

systemctl restart mongod

MichaelDrogalis

I've been working with Apache Kafka for over 7 years. I inevitably find myself doing the same set of activities while I'm developing or working with someone else's system. Here's a set of Kafka productivity hacks for doing a few things way faster than you're probably doing them now. 🔥

• Show me all my Kafka topics and their partitions, replicas, and consumers
• Show me the contents of a topic
• Create a Kafka topic
• Produce messages to a Kafka topic
• Validate the schema of messages before producing to a topic
• Do all of this at a distance

Get the tools

thuync

Install Postgres Logical decoding plugin

References

Install logical decoding plugin

Installation guides

• decoderbufs plugin

Install protobuf

nayato

FROM rustlang/rust:nightly as builder
WORKDIR /app/src
RUN USER=root cargo new --bin ht
COPY Cargo.toml Cargo.lock ./ht/

WORKDIR /app/src/ht
RUN cargo build --release

COPY ./ ./
RUN cargo build --release

kikitux

numnodes=2
baseip="192.168.10"

#global script
$global = <<SCRIPT

#check for private key for vm-vm comm
[ -f /vagrant/id_rsa ] || {
  ssh-keygen -t rsa -f /vagrant/id_rsa -q -N ''
}

thomasdarimont

package demo.plain;

import org.keycloak.OAuth2Constants;
import org.keycloak.admin.client.CreatedResponseUtil;
import org.keycloak.admin.client.Keycloak;
import org.keycloak.admin.client.KeycloakBuilder;
import org.keycloak.admin.client.resource.RealmResource;
import org.keycloak.admin.client.resource.UserResource;
import org.keycloak.admin.client.resource.UsersResource;
import org.keycloak.representations.idm.ClientRepresentation;

sebastianwebber

Uber facts

Original posts/information

Migrating Uber from MySQL to PostgreSQL

Key points

• ~50GB MySQL Application
• Main motivation: PostGis
• Migration made with a custom tool(xml2pgcopy) and mysqldump on 45min

valyala

Optimizing postgresql table for more than 100K inserts per second

• Create UNLOGGED table. This reduces the amount of data written to persistent storage by up to 2x.
• Set WITH (autovacuum_enabled=false) on the table. This saves CPU time and IO bandwidth on useless vacuuming of the table (since we never DELETE or UPDATE the table).
• Insert rows with COPY FROM STDIN. This is the fastest possible approach to insert rows into table.
• Minimize the number of indexes in the table, since they slow down inserts. Usually an index on time timestamp with time zone is enough.
• Add synchronous_commit = off to postgresql.conf.
• Use table inheritance for fast removal of old data:

alexdiliberto

let getRandomBytes = (
  (typeof self !== 'undefined' && (self.crypto || self.msCrypto))
    ? function() { // Browsers
        var crypto = (self.crypto || self.msCrypto), QUOTA = 65536;
        return function(n) {
          var a = new Uint8Array(n);
          for (var i = 0; i < n; i += QUOTA) {
            crypto.getRandomValues(a.subarray(i, i + Math.min(n - i, QUOTA)));
          }
          return a;