Bug 1294773

Summary: Host upgrade manager checks updates for all hosts at the same time
Product: [oVirt] ovirt-engine Reporter: Moti Asayag <masayag>
Component: BLL.InfraAssignee: Oved Ourfali <oourfali>
Status: CLOSED DUPLICATE QA Contact: Pavel Stehlik <pstehlik>
Severity: medium Docs Contact:
Priority: unspecified    
Version: 4.0.0CC: bugs
Target Milestone: ---Flags: rule-engine: planning_ack?
rule-engine: devel_ack?
rule-engine: testing_ack?
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2016-01-10 07:29:45 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Moti Asayag 2015-12-30 09:04:05 UTC 
Description of problem:
The scheduled job for checking availability of updates for the hosts is being scheduled at the same time for hosts in the system.
For RHEL/next-gen-ovirt-node hosts, it requires a dedicated thread for the duration of the ssh session. For a minutes or two there is a spike in thread consumption on the engine-server. If the repositories aren't refreshed, the check will take longer.

The purpose of the bug is to start each check in a random time, during the first hours of the engine's startup, so the overload will be divided. Future checks will be triggered based on that initial offset.

How reproducible:
always

Steps to Reproduce:
1. Have ovirt-engine with multiple hosts in up/maintenance status.
2. Start ovirt-engine, and wait for the host-upgrade-manager to check for updates.

Actual results:
The log (event-log/engine.log) indicates that all of the hosts are being examined at the same time.

Expected results:
Checking for host updates should be done more 'evenly'.
Comment 1 Moti Asayag 2016-01-10 07:29:45 UTC 

*** This bug has been marked as a duplicate of bug 1294772 ***