Review Request 31373: In cluster layout recommendation, slave component cardinality of 0+ not being used

[Andrew Onischuk <ao...@hortonworks.com>]

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Review request for Ambari and Nate Cole.


Bugs: AMBARI-9778
    https://issues.apache.org/jira/browse/AMBARI-9778


Repository: ambari


Description
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We now have a slave component that has a cardinality of `0+`. This component
in UI install wizard's host selection page does not want to be selected unless
the user specifically checks hosts. Upto now we have not used cardinality to
determine slave-component layout.

This should change so that when slave-component layout is being determined, it
should ask if component-name should use cardinality for layout. Call this
method `isComponentUsingCardinalityForLayout(componentName)`. The default-
stack-advisor will have always return false. However some stack-version could
return true. If so, the minimum number in the cardinality will determine the
number of hosts for the slave-component. If it is `0+`, then 0 hosts will be
selected. If it is `1+`, then atleast 1 host will be selected.


Diffs
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  ambari-server/src/main/resources/stacks/stack_advisor.py 3d22d92 

Diff: https://reviews.apache.org/r/31373/diff/


Testing
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mvn clean test


Thanks,

Andrew Onischuk