[jira] [Created] (AMBARI-2770) NameNode HA Wizard: prerequisite checks

["Aleksandr Kovalenko (JIRA)" <ji...@apache.org>]

Aleksandr Kovalenko created AMBARI-2770:
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             Summary: NameNode HA Wizard: prerequisite checks
                 Key: AMBARI-2770
                 URL: https://issues.apache.org/jira/browse/AMBARI-2770
             Project: Ambari
          Issue Type: New Feature
          Components: client
    Affects Versions: 1.4.0
            Reporter: Aleksandr Kovalenko
            Assignee: Aleksandr Kovalenko
             Fix For: 1.4.0


Prerequisite Checks
When the user clicks on "Enable NameNode HA", we will perform the following checks:
* If the cluster consists of less than 3 hosts, display the error message in a popup: "You must have at least 3 hosts in your cluster to enable NameNode HA".
* If the above check passes and if the cluster consists of less than 3 ZooKeeper Servers, display the error message in a popup: "You must have at least 3 ZooKeeper Servers in your cluster to enable NameNode HA".
* If the above check passes and if the cluster is already secure, display the error message in a popup: "You cannot enable NameNode HA via this wizard as your cluster is already secured.  First, disable security by going to Admin > Security, and then run this Enable NameNode HA wizard again.  After NameNode HA is enabled, you can go back to Admin > Security to secure the cluster."

The user cannot proceed forward in case any of the above errors have been encountered.


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