Alejandro Fernandez created AMBARI-18619:
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Summary: 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
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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