Hadoop QA commented on AMBARI-18619:

{color:red}-1 overall{color}.  Here are the results of testing the latest 
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author 

    {color:green}+1 tests included{color}.  The patch appears to include 1 new 
or modified test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the 
total number of javac compiler warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase 
the total number of release audit warnings.

    {color:red}-1 core tests{color}.  The patch failed these unit tests in 


Test results: 
Console output: 

This message is automatically generated.

> Optimize Service Checks to it picks a random host and prefers hosts with 0 
> active commands
> ------------------------------------------------------------------------------------------
>                 Key: AMBARI-18619
>                 URL: https://issues.apache.org/jira/browse/AMBARI-18619
>             Project: Ambari
>          Issue Type: Bug
>          Components: ambari-server
>    Affects Versions: 2.4.0
>            Reporter: Alejandro Fernandez
>            Assignee: Alejandro Fernandez
>            Priority: Critical
>             Fix For: 2.5.0
>         Attachments: AMBARI-18619.branch-2.5.patch, AMBARI-18619.trunk.patch
> STR:
> * Deploy a 3-node cluster with Ambari 2.4 and HDP 2.5 with clients on every 
> host.
> * Run multiple service checks in parallel, but notice that they typically run 
> on the same 1 or 2 hosts.
> Currently, Ambari relies on getting the list of candidate hosts from the DB 
> and excludes all hosts that are in maintenance mode. From that list, it picks 
> the first host that is healthy (i.e., heartbeating). This means that the 
> logic does not pick a random host.
> Instead, Ambari should always pick a random host and prefer to schedule on 
> hosts that have 0 in-progress commands.

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