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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