Hadoop defintive guide says - Each Namenode runs a lightweight failover controller process whose job it is to monitor its Namenode for failures (using a simple heartbeat mechanism) and ...

According to my reading on jboss documentation it says, We define high availability as the ability for the system to continue functioning after failure of one or more of the servers. A part of...

Tech Stack Python (Monolith API) - Flask Framework PostgreSQL We have deployed docker container as follows Docker image is stored in ECR Docker container is deployed in ECS In total 25 docker cont...

We're currently using Redis 2.8.4 and StackExchange.Redis (and loving it) but don't have any sort of protection against hardware failures etc at the moment. I'm trying to get the solution working w...

Does anyone know how to determine the active node of a SQL Active-Passive Failover Cluster programmatically from T-SQL? @@SERVERNAME only returns the virtual server name, which is identical from b...

What would be the best way to replicate individual DB tables from a Master postgresql server to a slave machine? It can be done with cron+rsync, or with whatever postgresql might have build in, or ...

I have a Redis Cluster (3 master and 3 slaves) running inside a Kubernetes cluster. The cluster is exposed via a Kubenetes-Service (Kube-Service). I have my application server connected to the Redi...

I was testing a web crawling/scrapping program on Apache Spark locally on my computer. the program use a few RDD transformations that takes a volatile function that sporadically fails. (The functi...

Is there a way to programmatically determine which node in a SQL Server failover cluster is the active node? Or at least determine whether the current machine is the active node? I have a Windows ...

I have an Azure API App Service that I want to configure "priority" traffic management for (this is the new Traffic Manager, not classic). I have deployed the service to two separate Azure regions ...

There are multiple articles suggesting that load-balancer should be used in front of RabbitMQ cluster. However, there are also multiple references that Spring AMQP is using some failover implemen...

we have setup a Kafka/Zookeeper Cluster consisting of 3 Brokers. We have one producer, sending messages to one specific Kafka topic and a few consumer groups reading from said topic. Those consumer...

When I compile my spring 3.2.9 web application using log4j 2.1, this error appears in the console: 2015-02-02 12:08:25,213 ERROR appender Failover has no parameter that matches element Failovers ...

I'm mysql newbie. when it comes to fail-over, which slave should be promoted to the new master? For example, A is master, B and C are slaves, and A does async replication to B and C. At some poi...

My question has two parts: What is the best way to initiate an RDS failover for testing purposes? How can I monitor the connection during failover in order to observe the time that it takes for ...

I am developing an application that uses activemq to exchange messages, some so big that I want to cancel then. We work with the activemq failover transport with two ActiveMQ instances (master/sl...

My application uses Postgresql 9.0 and is composed by one or more stations that interacts with a global database: it is like a common client server application but to avoid any additional hardware,...

Having read this question, I would like to ask additional questions: The Cluster Manager is a long-running service, on which node it is running? Is it possible that the Master and the Driver node...

Recently I was asked to implement client-side failover for an app I wrote. Personally, all the failover/load-balancing schemes I can recall working with have been implemented server-side, through a...

I've read why is it bad practice to call System.gc(), and many others, e.g. this one describing a really disastrous misuse of System.gc(). However, there are cases when the GC takes too long and av...

I am a beginner in nodejs. I am trying to use nodejs in production. I wanted to achieve nodejs failover. As I am executing chat app, if a node server fails the chat should not breakup and should be...

I've had a few outages of 10 to 15 minutes, because apparently Microsoft had a 'blip' on their storages. They told me that it is because of a shared file system between the instances (making it a s...

Here's my scenario (designed by my predecessor): Two Apache servers serving reverse proxy duty for a number of mixed backend web servers (Apache, IIS, Tomcat, etc.). There are some sites for which...

I'm a newbie in clustering and I'm trying to create a generic service to a cluster using PowerShell. I can add it without any issues using the GUI, but for some reason I cannot add it from PowerShe...

I am using NHibernate to connect to a legacy rdbms system. Under high production load the rdbms service fails. To maintain the availability we have a failover rdbms service. Is there a way to confi...