High Availability Hadoop (2.x.0) failover notification and hook service.
We needed a way to recieve events (hook) when the failover occured so that we could send alerts on it, as well as handle the failover for web services.
The intention here is regardless of whether you're on a private infrastructure or a public cloud (AWS) that you have a flexible way to handle these type of events.
Based on the zookeeper election, notifies promote and demote on the current host.
# Has a dependency on the native zookeeper libraries
$ apt-get install -y zookeeper-native libzookeeper-mt2
$ go get
$ makehadoopmon - High Availability Hadoop 2.x.0 failover service
usage:
hadoopmon [global options] command [command options] [arguments...]
commands:
namenode, nn Start the namenode monitor for the given cluster
resourcemanager, rm Start the resource-manager monitor for the given cluster
showbuild, b Shows the current build information
help, h Shows a list of commands or help for one command
global options:
--conf '/etc/hadoopmon' The hadoopmon config directory
--hdir '/etc/hadoop/conf' The hadoop config directory
--host 'kiva' The hostname to assume (override)
--version print the version
--help, -h show help$ hadoopmon nn titan$ hadoopmon rm titanThe hdir configuration references the base hadoop configuration directory where core-site.xml, yarn-site.xml, etc reside.
The conf configuration references the base directory for handling promote and demote commands.
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