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Questions tagged [failover]

The automatic switching to a redundant or standby computer server, system, hardware component or network upon the failure or abnormal termination of the previously active application, server, system, hardware component, or network.

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What is a database transaction?

Can someone provide a straightforward, yet not oversimplified explanation of a transaction as applied to computing?
Vlad Gudim
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Using SignalR with Redis messagebus failover using BookSleeve's ConnectionUtils.Connect()

I am trying to create a Redis message bus failover scenario with a SignalR app. At first, we tried a simple hardware load-balancer failover, that simply monitored two Redis servers. The SignalR application pointed to the singular HLB endpoint. I…
ElHaix
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Understand Spark: Cluster Manager, Master and Driver nodes

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 nodes will be the same machine? I presume that there…
Rami
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Determine Active Node in SQL Failover Cluster

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 both nodes. I don't plan to make any decisions based…
David Boike
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What algorithms there are for failover in a distributed system?

I'm planning on making a distributed database system using a shared-nothing architecture and multiversion concurrency control. Redundancy will be achieved through asynchronous replication (it's allowed to lose some recent changes in case of a…
Esko Luontola
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How does Hadoop Namenode failover process works?

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 trigger a failover should a namenode fail. How come a…
K246
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Leader election and Failover detection java library

I am looking for a library that provides the most basic clustering requirements. This library should hopefully come detached from a full blown state replication solution (ZooKeeper), since the state replication requirements are very…
itaifrenkel
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What happens if Zookeeper fails completely?

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 consumers perform a leader election via Zookeeper for…
tehK
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Apache proxy load balancing backend server failure detection

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 we have multiple backend web servers, and in those…
Jon Heese
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How to make RabbitMQ queues failover?

RabbitMQ supports clustering by default, but queues aren't replicated and are bound to the node on which they're created. I'm now looking for ways to make RabbitMQ highly available other than the DRBD solution that they've documented, because it…
Hongli
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redis: Handling failover?

Redis really seems like a great product with the built in replication and the amazing speed. After testing it out, it feels definitely like the 2010 replacement of memcached. However, since when normally using memcached, a consistent hashing is…
Industrial
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Failover & Disaster Recovery

What's the difference between failover and disaster recovery?
coder
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Apache Solr Failover Support in Master-Slave Setup

Our development team is currently looking into migrating our search system to Apache Solr, and we would greatly appreciate some advice on setup. We are indexing approximately two hundred million database rows. We add about a hundred thousand new…
ikarous
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What is the difference between failover vs high availability?

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 high availability is failover which we define as…
Techie
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Redis failover with StackExchange / Sentinel from C#

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 whereby we have master/slaves and sentinel monitoring…
Paul
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