Top "High-availability" questions

High availability is a software design approach and implementation that ensures a prearranged level of operational performance will be met during a contractual measurement period.

ZooKeeper alternatives? (cluster coordination service)

ZooKeeper is a highly available coordination service for data centers. It originated in the Hadoop project. One can implement locking, …

locking cluster-computing high-availability heartbeat apache-zookeeper
name node Vs secondary name node

Hadoop is Consistent and partition tolerant, i.e. It falls under the CP category of the CAP theoram. Hadoop is …

hadoop hdfs hadoop2 high-availability
Redis master/slave replication - single point of failure?

How does one upgrade to a newer version of Redis with zero downtime? Redis slaves are read-only, so it seems …

redis high-availability
Method to replicate sqlite database across multiple servers

I'm developing an application that works distributed, and I have a SQLite database that must be shared between distributed servers. …

sqlite replication distributed-computing high-availability rethinkdb
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 …

cluster-computing replication high-availability failover downtime
Any command to get active namenode for nameservice in hadoop?

The command: hdfs haadmin -getServiceState machine-98 Works only if you know the machine name. Is there any command like: hdfs …

hadoop high-availability yarn
HaProxy (cannot bind socket, select test failed)

Hello everyone, Im working about an high availbility project, I had to put in production an haproxy for some applications. …

sockets load-balancing high-availability haproxy
How to setup Jenkins with HA?

Currently we are using a Jenkins as our CI system and there is one master server and slaves which are …

linux jenkins continuous-integration jenkins-plugins high-availability
Web App: High Availability / How to prevent a single point of failure?

Can someone explain to me how high-availability ("HA") works for a web application ... because I assume HA means that there …

load-balancing high-availability cluster-computing uptime
Which part of the CAP theorem does Cassandra sacrifice and why?

There is a great talk here about simulating partition issues in Cassandra with Kingsby's Jesper library. My question is - …

cassandra partitioning high-availability consistency cap-theorem