Kailash Nadh knadh

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Unable to get cluster admin: kafka: controller is not available

If you get this error and don't want to waste hours trying to debug why kaf is unable to communicate with a Kafka cluster, make sure you have an entry in the hosts file for the system's hostname that resolves to self (127.0.0.1), if your cluster is running locally.

Running multiple active publishers on a NATS cluster for failover while avoding message duplication

NATS is an excellent, clustered, full-mesh PubSub messaging system, highly performant and a cakewalk to setup. Full mesh means every node (servers and clients) knows about every other node, which is great, but makes it tricky to have multiple publishers on hot standby, for high availability of publishers (not the NATS network), while avoiding duplicate pubs.

Here --no-advertise comes in handy if we're willing to sacrifice the automatic meshing and discovery mechanism. This may be acceptable in setups where only a fixed set of NATS servers run in a cluster and whose addresses (either IPs or hostnames) are known.

--no-advertise

The gnatsd --no-advertise flag makes a NATS server not advertise itself automatically to the mesh. For other nodes to discover --no-advertise nodes, the --routes have to be explicitly specified. If there are N servers, there should be N routes.

	package main

	import (
	"fmt"
	"time"
	)

	func main() {
	fmt.Println(unixToTime(time.Now().UnixMilli()))
	}

	package main

	import (
	"fmt"
	)

	var (
	ones = []string{
	"zero", "one", "two", "three", "four",
	"five", "six", "seven", "eight", "nine",

	#!/usr/bin/env bash

	DATABASE_URL="postgres://MyPostgresUser:[email protected]:5432/MyPostgresDB"

	# `cut` is used to cut out the separators (:, @, /) that come matched with the groups.

	DATABASE_USER=$(echo $DATABASE_URL \| grep -oP "postgres://\K(.+?):" \| cut -d: -f1)
	DATABASE_PASSWORD=$(echo $DATABASE_URL \| grep -oP "postgres://.*:\K(.+?)@" \| cut -d@ -f1)
	DATABASE_HOST=$(echo $DATABASE_URL \| grep -oP "postgres://.*@\K(.+?):" \| cut -d: -f1)
	DATABASE_PORT=$(echo $DATABASE_URL \| grep -oP "postgres://.@.:\K(\d+)/" \| cut -d/ -f1)

	package main

	import (
	"encoding/json"
	"strings"
	"testing"
	)

	var nested map[string]interface{}

	package cacheman

	import (
	"errors"
	"fmt"
	"reflect"
	"strconv"
	"strings"
	)

	ALTER TABLE media DROP COLUMN width, DROP COLUMN height;
	ALTER TABLE media ADD COLUMN provider TEXT NOT NULL;
	DROP TABLE IF EXISTS settings CASCADE;
	CREATE TABLE settings (
	key TEXT NOT NULL UNIQUE,
	value JSONB NOT NULL DEFAULT '{}',
	updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
	);
	DROP INDEX IF EXISTS idx_settings_key; CREATE INDEX idx_settings_key ON settings(key);
	INSERT INTO settings (key, value) VALUES

	// program
	package main

	import (
	"fmt"
	"log"
	"os"
	"os/signal"
	"syscall"
	"time"