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From Matt <>
Subject Re: Review Request 43430: assign_master_component.js does not show recommendations while adding master component for a service which is already installed
Date Tue, 16 Feb 2016 19:33:05 GMT

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(Updated Feb. 16, 2016, 11:33 a.m.)

Review request for Ambari, Alexander Denissov, Alejandro Fernandez, Aleksandr Kovalenko, Alexandr
Antonenko, bhuvnesh chaudhary, Goutam Tadi, Jaimin Jetly, jun aoki, Lav Jain, Newton Alex,
Oleksandr Diachenko, and Sumit Mohanty.

Bugs: AMBARI-14987

Repository: ambari


On the assign masters page for the wizard, recommendations are not shown for a master component
that is being added for an installed service.

This happens while adding HAWQSTANDBY to the cluster using the 'Add HAWQSTANDBY' wizard (situation:
HAWQ service is already installed on the cluster).

The function getHostForMaster used to return the next available host for the master.
For example:
Case 1: component C1 is NOT installed on any hosts.
getHostForMaster would return the first host from the allHosts list.
Case 2: component C2 is installed on host H1
getHostForMaster would return next available host from the allHosts list.
If allHosts = ['H1', 'H2', 'H3']. It would return H2

To avoid just placing the component on the next available host, the recommendation is considered.
Current implementation:
If a host is recommended for the master, place it on that host (if it is not already installed
on that host).
If no recommendation is given, place it on the next available host.


  ambari-web/app/assets/test/tests.js 9d5cbc1 
  ambari-web/app/mixins/wizard/assign_master_components.js f6d1b1a 
  ambari-web/test/mixins/wizard/assign_master_components_test.js PRE-CREATION 


Testing (updated)

Manually Tested.

Tested assign_master page on cluster installation, add service wizard, enable namenode wizard
and add hawq standby wizard.

Unit test added:
  10410 tests complete (9 seconds)
  121 tests pending

[INFO] ------------------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 54.125 s
[INFO] Finished at: 2016-02-12T23:58:05-08:00
[INFO] Final Memory: 12M/311M
[INFO] ------------------------------------------------------------------------



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