Thank you very much for all this detailed informations, Shirly. The only point 
is that we (must I say "I" ?) never really ask for DWH when installing ovirt 
with hosted engine, maybe it's a lake of documentation on my part but I never 
hear about it in the installation procedure. Where I deduce that it is 
installed with ovirt engine, and if it is a Postgre functionality, and if the 
Postgre database is automatically created in the engine VM, so it is installed 
in the engine VM (Q.E.D. :) )
The warning you point to me maybe is not enough visible in installation 
procedures for who lives in a country subject to the summer/winter time... But 
even apart of that, I don't remember during the hosted engine installation a 
moment where it ask us for a timezone, you see ? So I wonder where or when I 
could have force UTC time, in fact...
Can you tell me (and maybe for others installing it in France or similar 
countries) if you see when this DWH and timezone questions can be managed in 
the hosted engine installation process ?

This said, if I understand correctly your answers below, can I resume as this : 
don't touch anything now, as the error is automatically repaired after this "1 
hour gap / overlap" (so I have no more messages after 3:00AM). Right ?

Many thanks again,
--

Regards,

Frank
 

Le Dimanche, Octobre 28, 2018 13:26 CET, Shirly Radco <sra...@redhat.com> a 
écrit:
  Please see answers below and let me know if you have any other questions. 
Best,--
SHIRLY RADCO
BI SENIOR SOFTWARE ENGINEER
Red Hat IsraelTRIED. TESTED. TRUSTED. On Sun, Oct 28, 2018 at 12:55 PM fsoyer 
<fso...@systea.fr> wrote:Well, I see that I'm late to give the information :) 
Thank you to pointing me to this, but I have now some other questions now...
How can I see the timezone of the DB ? "If no time zone is stated in the input 
string, then it is assumed to be in the time zone indicated by the system's 
TimeZone parameter, and is converted to UTC using the offset for the timezone 
zone." 
https://serverfault.com/questions/554359/postgresql-timezone-does-not-match-system-timezone
 When it says "all machines", do you confirm that this is physical machines, 
not VMs ? I mean the machine DWH is installed on. It can be a VM.But I'm not 
saying we recommend all VMs to be set to UTC. May I apply the solution given on 
access.redhat or not, as there is no more messages since 3AM ? No need.  And, 
last question but not least, can this timezone be changed on the machines (and 
DB ?) without issue ? It is possible to update it, but its not mandatory. The 1 
hour gap / overlap is expected when moving from summer to winter and back when 
not using UTC and I'm not sure if its even worth updating at this point,at the 
risk of ending up with a real bug.. 
--
Regards,

Frank

Le Dimanche, Octobre 28, 2018 11:40 CET, Shirly Radco <sra...@redhat.com> a 
écrit:
 Hi, Please see 
herehttps://www.ovirt.org/documentation/data-warehouse/Data_Collection_Setup_and_Reports_Installation_Overview/
 "It is recommended that you set the system time zone for all machines in your 
Data Warehouse deployment to UTC. This ensures that data collection is not 
interrupted by variations in your local time zone: for example, a change from 
summer time to winter time." What timezone is your DB configured to? Best, --
SHIRLY RADCO
BI SENIOR SOFTWARE ENGINEER
Red Hat IsraelTRIED. TESTED. TRUSTED. On Sun, Oct 28, 2018 at 12:32 PM fsoyer 
<fso...@systea.fr> wrote:Hi all,
Maybe it has already been posted, but I think I've discoverd a little bug. This 
night I had this messages :
28 oct. 2018 03:00:00
ETL service aggregation to hourly tables has encountered an error. Please 
consult the service log for more details.
28 oct. 2018 02:40:27
ETL service sampling has encountered an error. Please consult the service log 
for more details.
28 oct. 2018 02:33:42
ETL service sampling has encountered an error. Please consult the service log 
for more details.
28 oct. 2018 02:27:42
ETL service sampling has encountered an error. Please consult the service log 
for more details.
28 oct. 2018 02:22:27
ETL service sampling has encountered an error. Please consult the service log 
for more details.
28 oct. 2018 02:16:37
ETL service sampling has encountered an error. Please consult the service log 
for more details.
28 oct. 2018 02:11:06
ETL service sampling has encountered an error. Please consult the service log 
for more details.
28 oct. 2018 02:05:06
ETL service sampling has encountered an error. Please consult the service log 
for more details.
28 oct. 2018 02:00:06
ETL service sampling has encountered an error. Please consult the service log 
for more details
28 oct. 2018 02:00:00
ETL service aggregation to hourly tables has encountered an error. Please 
consult the service log for more details.and, coincidence, here in France we 
have change to winter hour at... 2AM :) So regarding this post:
https://access.redhat.com/solutions/3338001
speaking about a time problem, I've supposed that this is related ! No ? 
access.redhat says that the cause was not yet determined, but maybe it can be 
interesting to propose this cause ? But the bug is actually closed.

Question : does this repair all alone (as there is no more messages after 3AM) 
or may I applied the solution with postgres updates (I must say that I'm not 
very enthousiast for that...) ?

Regards,

--
Frank _______________________________________________
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