Have the master instance run jobs, or not

Added: 20 Jun 2012

By default, CloudMan will configure your cloud cluster to run jobs on the head node (i.e., the master instance). This allows you to have only a single cloud instance and start using it instantly, thus minimizing the cost associated with using a cloud. However, such behavior may not always be desirable. If, for example, you have a substantial number of users or jobs being submitted, the head node may be busy running jobs and lead to poor responsiveness of user services. Alternatively, you may choose to keep a small (i.e., cheap) master instance alive at all times so users can use it whenever needed. Such instance may not have enough power to also handle user jobs though.

CloudMan enables you to toggle the master instance from running jobs. Simply go to the Admin page and click on Switch master not to run jobs and no jobs will run on the master instance:

Switch master not to run jobs

You can revert this decision at any point by clicking Switch master to run jobs. Note that if you chose to have the master instance not run any jobs, it will be necessary to have at least one worker instance to handle any jobs. Fortunately, this is also simple and automated via CloudMan's auto-scaling feature.

Tags: admin , cluster