[jira] [Created] (AMBARI-14966) Stack Advisor incorrectly recommends Slave component on a host which does not have it installed during Add service wizard

["bhuvnesh chaudhary (JIRA)" <ji...@apache.org>]

bhuvnesh chaudhary created AMBARI-14966:
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             Summary: Stack Advisor incorrectly recommends Slave component on a host which does not have it installed during Add service wizard
                 Key: AMBARI-14966
                 URL: https://issues.apache.org/jira/browse/AMBARI-14966
             Project: Ambari
          Issue Type: Bug
          Components: stacks
    Affects Versions: trunk
            Reporter: bhuvnesh chaudhary
            Priority: Trivial


Steps to reproduce:

- Install a cluster with HDFS (To start with single node host c6401)
[^FreshInstallOnSingleNode.png]
- Add a new host (c6402) and don't add any of the slave components or client
[^AddHostWithoutAnyService.png]
- Add HAWQ or any other service, don't change the recommendation on master components page and click next
- Datanode checkbox will be checked on c6402 even though its not installed.
[^IncorrectAssignment.png]

Bug:
- Datanode should not be checked on c6402 as its not installed on the host. 

Current Behavior:
- In stack advisor, a list of free hosts is created at https://github.com/apache/ambari/blob/trunk/ambari-server/src/main/resources/stacks/stack_advisor.py#L382
- During the step of creating the recommendation for Slave components slave hosts map is extended with any of the hosts in the freeHosts list at https://github.com/apache/ambari/blob/trunk/ambari-server/src/main/resources/stacks/stack_advisor.py#L412-L413
- Then in Ambari-web it updates the checkbox or datanode as installed on a not installed node.

Since this minor code changes goes to core stack advisor, i am requesting inputs to be sure before going ahead with the change.

Few questions:
1. Do we extend the hostlist for already installed Slaves for some reason or its incorrect ?
2. Do you foresee any concerns with the patch. (I have tested it on Fresh Install of Cluster and Add services page)

After fix: Datanode is not checked  on c6402
[^AfterFix.png]



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