Ambari Forum

Ambari – scaling instances up and down

  • #50050
    Sri Sushma K


    I have few questions regarding Ambari on EC2 as compared to Amazon EMR.

    1. For people who worked with Amazon EMR we know that we can increase or delete the number of instances that are running for a particular configuration.
    2. I configured Ambari on EC2, can a new EC2 instance be added at any point of time to the already existing cluster from the “add hosts” option in ambari UI?
    3. Also can I delete any instance that I do not need(obviously slave instance). I doubt it makes the cluster unstable, is not it ? Is there any workaround about how I can delete an instance from an already configured cluster?

    Thank You.

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  • #50051
    Jeff Sposetti

    For question #2: yes. First, create your EC2 instances and then run the “Add Hosts” wizard (found on the Hosts page) to add hosts to the cluster
    For question #3: yes. There is a “Delete Host” option in the Host Actions menu on the host page.

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