different return orders depending on backend

[gordon chung]

mongo/db2nosql backend sorts samples by descending timestamp when querying for samples. HBase backend does not do this... we need to make sure all backends return the same ordering

[Ildiko Vancsa (ildiko-vancsa)]

Hi Gordon,

I wrote some tests and according to the results, the only backend, which does not provide default ordering by 'timestamp', is HBase.

Which SQL backend did not support this default order by exactly? Did you try both the simple and complex query?

Best Regards,
Ildiko

[gordon chung (chungg)]

... i'm an idiot. was looking at wrong code.... i'll leave this open for hbase (please close if hbase is not necessary)

[Ildiko Vancsa (ildiko-vancsa)]

Hi Gordon,

Thanks for the quick update. No worries, I tried to check some doc about HBase for orderby support, I'm not sure that I found the solution, I have to look deeper to decide and I also need to check the currently supported version.

In the worse case I will ask Nadya's opinion about this and then I/we will decide what to do with this bug. :)

Best Regards,
Ildiko

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.openstack.org/84674

[gordon chung (chungg)]

this is already how we build rowkey in hbase[1]

[1] https://github.com/openstack/ceilometer/blob/master/ceilometer/storage/hbase/utils.py#L42-L58