hi everybody,
        
        Recently, I have tested oVirt Reports. And I encountered a problem about some reports that cannot show data. And then I setup the DWH development environment. I found maybe this reason for missing data is the AggregationToHourly3.5. When data from datacenter_samples_history were inserted to datacenter_hourly_history, u will find nothing happened. Because the select sql before inserting data reads:

"SELECT history_id,
history_datetime,
      datacenter_id,
      datacenter_status,
      minutes_in_status,
datacenter_configuration_version
FROM datacenter_samples_history
WHERE history_datetime >= '"+context.lastHourAggr+"'
AND history_datetime < '"+TalendDate.addDate(context.lastHourAggr, 1,"HH")+"'
ORDER BY history_datetime, 
                   datacenter_id, 
                   datacenter_status"


And then I queried the table of datacenter_samples_history & history_configuration (has the field of lastHourAggr) in the db of ovirt_engine_history. The results are as follows:

ovirt_engine_history=# select * from history_configuration;
     var_name      | var_value |      var_datetime      
-------------------+-----------+------------------------
 MinimalETLVersion | 3.5.0     | 
 default_language  | en_US     | 
 firstSync         | false     | 2014-10-13 19:42:00+08
 lastDayAggr       |           | 2014-11-14 00:00:00+08
 lastHourAggr      |           | 2014-11-15 06:00:00+08
 HourlyAggFailed   | false     | 
(6 rows)


 
ovirt_engine_history=# select history_datetime from datacenter_samples_history;
      history_datetime      
----------------------------
 2014-11-13 03:07:00.23+08
 2014-11-13 03:08:00.238+08
 2014-11-13 03:09:00.229+08
 2014-11-13 03:10:00.221+08
 2014-11-13 03:11:00.229+08
 2014-11-13 03:12:00.221+08
 2014-11-13 03:13:00.237+08
 2014-11-13 03:14:00.22+08
 2014-11-13 03:15:00.221+08
 2014-11-13 03:16:00.238+08
 2014-11-13 03:17:00.238+08

 

Obviously, history_datetime < lastHourAggr , the data will never be inserted to the datacenter_hourly_history. And the place where I bold is the root cause of the error. Then , I try to update the lastHourAggr in the table of history_configuration. Reports works successfully. However, the lastHourAggr will change to 2014-11-15 afterwards. But u know Today is 2014-11-14 ! I have no idea about why the value of lastHourAggr is 2014-11-15. Would u help me solve this problem. Thanks a lot !